Chemical technology and economic assistance

Volume 18

Economics of chemical technology

Several fine chemical products that chlor-alkali enterprises can consider developing.

Liang cheng

(Nanjing Chemical Plant, Nanjing 2 10038)

This paper introduces the production and market situation of several chlorine-based fine chemical intermediates that chlor-alkali enterprises at home and abroad can consider developing, and puts forward a

Some suggestions.

Chlorinated paraffin; Benzyl chloride; P-dichlorobenzene; Propylene oxide; chloroacetyl chloride

The article number is1006-253x (2000) 03-0018-05, the classification number of China Library is TQ 1 14, and the document identification number is B.

Since 1990s, the structure of chlor-alkali products in developed countries has undergone great changes.

Great change: with strong acceleration, we will move forward in the direction of high technology, high added value, refinement and specialization. Fine chemical industry is the forefront of the development of chlor-alkali industry in the world, which has become the focus of fierce competition among chlor-alkali enterprises and the winning strategy of chlor-alkali enterprises in 2 1 century. China's Ninth Five-Year Plan and 20 10 long-term goal outline also clearly stipulate that the chemical industry should take the road of refinement. Chlor-alkali enterprises in China are facing increasingly fierce competition and challenges at home and abroad. Fine chemical industry has less dependence on resources, less investment, quick effect, high added value, great profit and high foreign exchange earning through export. Therefore, the development of fine chemicals is the key for chlor-alkali enterprises to realize the fundamental transformation of economic growth mode.

The key to the development of fine chemicals in chlor-alkali enterprises is to adjust the product structure around the core of "chlor-alkali balance", extend the development to the middle and lower reaches, realize "one-stop" serial production in the upper, middle and lower reaches, diversify management, popularize downstream products and equipment, and cultivate "product tree" or "product chain" of fine chemicals. Only in this way can we conform to the development trend of chlor-alkali industry and world chemical industry, and gain a foothold in the increasingly fierce competition and go global.

In view of this, the author intends to introduce the production development trends of several basic products with promising market prospects, large demand and urgent need for development, so as to provide reference for chlor-alkali enterprises to develop fine chemical products. 1 chlorinated paraffin

Chlorinated paraffin -70 is a fine organochlorine product, which consumes a lot of chlorine and produces a large amount. Mainly used as flame retardants for glass fiber reinforced polyester, polystyrene, phenolic resin, urea-formaldehyde resin, unsaturated resin, epoxy resin, polyolefin, polyurethane and other polymer materials, additives for water-resistant and chemical-resistant paints and fire-retardant coatings, and additives for adhesives. It can also be used in brightener, penetrant, cement, ink, glass fiber reinforced plastic, canvas production, flame retardant for wallpaper, lubricating additive, underwater antifouling paint, etc. 1. 1 production overview

The main manufacturers of chlorinated paraffin -70 abroad are: Dover ICI Company of the United States; Hirst Company of Germany; Japan Ajisen Company and

Electronic company. Before 1995, most manufacturers used carbon tetrachloride as solvent to produce chlorinated paraffin -70. After 1995, developed countries implemented the Montreal Convention, and closed the carbon tetrachloride process units one after another, and changed to the water-phase method, but most manufacturers kept the current process technology strictly confidential.

The domestic production capacity of chlorinated paraffin -70 is about 6.5438+0.5 million t/a. The main manufacturers are Shenyang Chemical Co., Ltd., Harbin Yibin Chemical Co., Ltd., Shanghai Chlor-Alkali General Factory, Xiamen Electrochemical Plant, Juhua Group, gedian Chemical Group, etc. The production scale is mostly 0.5 ~ 3 kt/a, and the production methods adopted are carbon tetrachloride photooxidation, water suspension, thermal oxidation and bulk method. The market overview of 1.2 is restricted by the Montreal Convention, and developed countries have closed their original production facilities one after another, and many new processes are still under development. Therefore, there is a big gap in the international market of high-quality chlorinated paraffin -70 since 1996. 198 1 ~ 1996, the international price of chlorinated paraffin -70 is basically stable at 1.52 USD/kg. 1In July 1997, the price suddenly rose and the demand in the international market was tight. At 1997 East China Commodities Fair and Tianjin Export Commodities Fair, foreign businessmen ordered nearly 10,000 tons of chlorinated paraffin -70 from China. At present, the price of chlorinated paraffin has declined, and will tend to be stable in the future. Therefore, as long as the quality is good and the price is appropriate, China's chlorinated paraffin -70 has a great competitive advantage in the international market, with great export potential and promising market prospects.

Plastic products industry is the main consumption department of chlorinated paraffin -70. The plastic products industry in China has made great progress during the Seventh Five-Year Plan period, and the product quality and scale have entered the advanced ranks in the world.

Date of receipt: 1999-09-22

Author's brief introduction Liang Cheng, male, 1992 graduated from the Department of Chemical Engineering of Nanjing University of Chemical Technology, and is a chemical engineer. He has published nearly 20 papers and is currently engaged in the development of fine chemicals and information workers.

Liang Cheng No.3, 2000: What fine chemical products can chlor-alkali enterprises consider developing? 19?

The average growth rate of 6%. Chlorinated paraffin -70 is mainly used to produce plastic flame retardant. According to the prediction of relevant experts, the demand for chlorine-containing flame retardants in China in 2000 is 33,000 t ~ 35,000 t, of which the demand for chlorinated paraffin -70 is 20000t ~ 25000t t. If export is considered, the total output of chlorinated paraffin -70 in China should reach at least 40,000 t in 2000. Compared with the current total production capacity, China's chlorinated paraffin -70 still has great room for development.

1.3 suggestion

At present, the domestic production facilities of chlorinated paraffin -70 are very backward: the facilities are small in scale, scattered in locations, the technological process is extremely unreasonable, the production technology level is equivalent to that of foreign countries in the 1960s, the variety is single, the application fields are monotonous, the key equipment involving advanced production technology cannot be localized, and the product quality is extremely poor. The consumption quota of carbon tetrachloride is 8 ~ 10 times of the world advanced level, and the residue is high. Foreign countries put forward very strict requirements for the residual carbon tetrachloride in chlorinated paraffin -70 containing carbon tetrachloride.

Chlorinated paraffin -70 has broad market prospects and remarkable economic benefits. It is suggested that domestic chlor-alkali enterprises with conditions should vigorously develop and start producing serialized products.

Benzyl chloride 2

Benzyl chloride is an important organic intermediate, which is widely used in the synthesis of pesticides, spices, medicines, dyes and organic synthesis AIDS. It is mainly used to synthesize important organic compounds such as phenylacetic acid, phthalate esters and benzyl alcohol.

2. 1 production overview

The global total production capacity of benzyl chloride is about 200,000 t/a, and the main foreign manufacturers are Monsanto in the United States and Tesendello in Belgium.

Atto chemical holding company in Britain, ChemieSe in Germany, Bayer,

Italy EnichemAnicSrl, Japan Bosco Valley, Wuyu Chemical Co., Ltd. Foreign benzyl chloride is mainly used to produce benzyl phthalate.

Ester, benzyl alcohol, phenylacetonitrile, benzyl quaternary ammonium salt, etc. The domestic production capacity of benzyl chloride is over 40,000 t/a, including Korea Organic Chemical Plant, Shandong Tancheng Chemical Plant and Jinzhou Petrochemical Plant. Jiangsu Shuangling Chemical Group (1 .2000 tons/year) and Wuhan Organic Chemical Plant (1.5000 tons/year) are relatively large, while other plants are around11000 tons/year. ..

2.2 Market Overview

The main derivatives of benzyl chloride have matured in foreign markets, especially in developed countries such as Europe, America and Japan, with small annual import and export volume. The consumption growth rate of benzyl chloride has been kept at around 1% in recent years, and some countries have zero or negative growth. In a word, the international benzyl chloride market is mature, the future demand growth will not be very fast, and the total production capacity will not develop greatly.

Benzyl chloride is mainly used to produce phenylacetic acid, pesticides, benzyl alcohol, benzyl quaternary ammonium salt, pyromellitic acid and benzylamine in China. The domestic consumption of benzyl chloride in 1992 ~ 1994 was 12000t ~ 14000t, and the consumption of t, 1995 and 1996 increased rapidly./kloc- Among them, 20% is used to produce pesticides, about 40% is used to produce phenylacetic acid, about 15% is used to produce benzyl alcohol, 10% is used to produce benzyl quaternary ammonium salt, 5% is used to produce phthalate esters, and other products account for 10%.

Pesticide industry is one of the main users of benzyl chloride, and 1997 consumes about 4kt of benzyl chloride. With the adjustment of pesticide structure in China, the proportion of pesticides will further decline. It is expected that the amount of benzyl chloride in pesticides will not change much in the future, or it may decrease slightly.

Phenylacetic acid is a big consumer of benzyl chloride, and the consumption in 1997 is about 8kt. Phenylacetic acid is mainly used in medicine and perfume industry. At present, the domestic and international markets of penicillin industrial salt have great development space, and the perfume industry is developing rapidly, so the annual demand for benzyl chloride in the production of phenylacetic acid will increase at a rate of about 6%.

The annual consumption of benzyl chloride in the production of benzyl alcohol is nearly 3kt. Benzyl alcohol is mainly used to produce benzyl ester, which is used to synthesize perfume or export. In recent years, the perfume industry in China has developed rapidly, and the demand for benzyl ester and its export will increase in the next few years. The demand of benzyl alcohol for benzyl chloride will increase at an average annual rate of 5%.

Benzyl quaternary ammonium salt is a rapidly growing variety of benzyl chloride in recent years. At present, the annual consumption of benzyl chloride exceeds 2kt. Benzyl quaternary ammonium salt is mainly used in water treatment, disinfection, fabric softener and so on. In the future, the consumption of quaternary ammonium salt in China will increase rapidly. It is estimated that about 3kt of benzyl chloride will be needed to produce quaternary ammonium salt in 2000.

The demand for benzyl chloride, such as phthalate esters, will increase in the next few years, but not too much. It is estimated that by 2000, they will consume about 3.5 tons of benzyl chloride.

To sum up, it is estimated that the domestic consumption of benzyl chloride will reach about 25,000 t in 2000, the supply and demand are basically balanced, and the market will not fluctuate greatly.

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Chemical technology and economic assistance

Volume 18

Economics of chemical technology

After use, the dosage basically keeps a certain level and will not change much, but the dosage of PPS resin in engineering plastics increases rapidly. In recent years, PPS resin has grown at a high speed of 40% ~ 50%, and it is expected to maintain an annual growth rate of 20% in the future. Therefore, it is estimated that the global demand for p-dichlorobenzene will be about 200,000 tons in 2000.

In China, p-dichlorobenzene is mainly used to replace refined naphthalene to produce moth-proofing and mildew-proofing agents. 1993 The State Economic and Trade Commission and the Ministry of Health jointly announced that they would stop producing and selling naphthalene sanitary balls. As a new third-generation insecticide and mildew inhibitor, p-dichlorobenzene has good efficacy. There is no conclusive evidence that its toxicity has an impact on people, and it has not been banned abroad. In addition, with the vigorous development of China's tourism industry, the amount of deodorant in hotels and restaurants has greatly increased, and the production of insect repellent deodorant with p-dichlorobenzene has broad market prospects. In addition, with the needs of economic construction, the new engineering plastic polyphenylene sulfide will be further developed, and its demand for p-dichlorobenzene will definitely increase in the next 10 year. Moreover, because of environmental problems, developed countries are unwilling to expand the production of chlorinated products of p-chlorobenzene, and even have to dismount (for example, seven sets of chlorinated benzene production plants were closed in Western Europe in the 1980s), but the consumption of p-dichlorobenzene is gradually increasing, so the export prospect of p-dichlorobenzene in China is attractive. According to this forecast, by the year 2000, the domestic demand for p-dichlorobenzene will be about 20 thousand t. 3.3 Suggestions.

At present, the production process of p-dichlorobenzene in China is not up to standard, the product quality is uneven, the scale is still small, and the operating rate is low. The author thinks that the research and development of directional chlorination process should be strengthened, and foreign advanced separation technology and equipment should be introduced to improve the product quality. In the future, the competition for p-dichlorobenzene will mainly be at home, so chlor-alkali enterprises with conditions should introduce foreign advanced technology as soon as possible, produce on a large scale, and occupy domestic and foreign markets with high quality and low price. Propylene oxide

Propylene oxide is an important basic organic raw material, which is mainly used to manufacture polyurethane synthetic materials and unsaturated polyester resins. It is the sixth largest chlorine product after hydrochloric acid, liquid chlorine, PVC, chlorobenzene and chlorosulfonic acid.

4. 1 production overview

1995 The world propylene oxide production capacity reached 4.422 million tons, and the total output was 391.1.000 tons. The main production methods were chlorohydrin method and indirect oxidation method, accounting for 48% and 52% of the total production capacity respectively. The main foreign manufacturers are: American Arco Company (with a capacity of 325,000 t/a), Dow Company (74 1 10,000 t/a) and Texcao Company (18 1 10,000 t/a); Germany Dow (420,000 t/a) and BASF (65438+100,000 t/a); Dutch Acro Company (245,000 t/a) and Shell Company (654.38+07,000 t/a); Arco France (200,000 tons/year); Japanese Oaksey orchid (654.38+600,000 t/a) and Asahi glass (654.38+600,000 t/a); Korea Oilfield -Arco Company (140,000 tons/year); Although the supply and demand of Singapore Shell and China benzyl chloride are basically balanced, the manufacturers have been plagued by many problems such as small scale, backward technology, high unit consumption, three wastes pollution and so on.

Benzyl chloride is a large-tonnage chlorine-consuming product, which is widely used. It is suggested that chlor-alkali enterprises should develop more benzyl chloride derivatives to realize large-scale production, replace the current horizontal continuous photochlorination process of glass with large vertical continuous thermal chlorination process of enamel, develop benzyl chloride refining process, strictly control the three wastes, and strengthen the recovery of benzyl chloride and benzaldehyde. Promote the development of benzyl chloride industry in China.

3- p-dichlorobenzene

P-dichlorobenzene is an important organic chemical raw material, which is used to make sanitary balls, insect-proof, mildew-proof and insect-repellent, pesticides, dyes, polyphenylene sulfide and other engineering materials.

3. 1 production overview

The main foreign producers of p-dichlorobenzene are Monsanto, Pittsburgh Glass Industry Company and Standard Chlorine Chemical Company, with a total production capacity of about 35,300 t/a; The total production capacity of Bayer Company, Hester Company and Puke Company in Western Europe is about 55,000 t/a; Japan's Gemdale, Wuyu Chemical, Mitsui East Asia, Nippon Chemical, Sumitomo Chemical, etc. The total production capacity is nearly 40,000 tons per year.

According to the statistics of 1997, the domestic enterprises producing p-dichlorobenzene are: 6kt/a of Jinxi Chemical General Factory, 2kt/a of Zhangdian pesticide plant, 3kt/a of Tianjin Chemical Plant (stopped production for some reason), 6kt/a of Tangshan chlor-alkali plant and 3kt/a of Henan Fuyang Chemical Plant. Most other enterprises produce dichlorobenzene, a by-product of chlorinated benzene, and sell it directly in the form of mixed dichlorobenzene without separation and purification. At present, the domestic production capacity of p-dichlorobenzene is about 20,000 t/a, but the unit operating rate is low. It is an urgent problem to improve the process of existing devices and increase the operating rate in the production of p-dichlorobenzene in China. 3.2 Market Overview

The production and sales of p-dichlorobenzene abroad in recent 20 years show that the market of p-dichlorobenzene is mature, and the total production and consumption tend to be balanced, which is about 6.5438+0.5 million t/a. In the United States, the consumption of p-dichlorobenzene used as room deodorant and moth-proofing agent is relatively stable, accounting for about 35% of the total output, 27% is used to make polyphenylene sulfide resin, and 30% is used for export, mainly to Belgium, Brazil, Canada and Mexico. In western Europe, the amount of p-dichlorobenzene used to produce deodorizers and insect-proof and moth-proof agents accounts for about 70% of the total, and the rest is mainly used to produce 2,5-dichloronitrobenzene, and then to synthesize dyes. Japanese p-dichlorobenzene is mainly used as insecticide and air deodorizer, accounting for 9 1% of the total output, and the rest is used in dye production.

Judging from the consumption composition abroad, p-dichlorobenzene is mainly used as moth-proofing agent and deodorant, followed by the synthesis of 2,5-dichloronitro.

Liang Cheng No.3, 2000: What fine chemical products can chlor-alkali enterprises consider developing? 2 1?

It also has production facilities with a production capacity of nearly 654.38 million tons/year.

The first propylene oxide plant in China was put into production on 1956, when the production capacity was only 800 t/a. At present, there are more than 20 propylene oxide production plants in China, but the production scale is much smaller than that of foreign countries. Enterprises with a production capacity of over 10,000 tons include Jinxi Chemical General Factory, Shanghai Gao Qiao No.3 Chemical Plant, Zhejiang Pacific Chemical Company, Jiangxi Jiujiang Chemical Plant, Tianjin Dagu Chemical Plant, Shanghai Gao Qiao Chemical Plant, Nanjing Jinling Petrochemical No.2 Chemical Plant and Shandong Dongda Chemical Company. 1997 The total national production capacity is nearly 200,000 tons ... Recently, the 80,000-ton/year propylene oxide plant of Jinxi Chemical General Factory started construction.

4.2 Market Overview

With the continuous expansion of application scope, especially the rapid development of downstream products, the market demand for propylene oxide is increasing. 1997 The world demand for propylene oxide was 4.2 million tons, and it is estimated that the demand will reach 4.47 million tons in 2000. Among them, the Asia-Pacific region has the fastest growth rate, with an estimated annual growth rate of 6%. The United States is the largest consumer of propylene oxide, accounting for nearly 40% of the total world consumption. Propylene oxide is mainly used to produce polyether polyol, propylene glycol and propylene glycol ether. During 1995, the global consumption and composition of propylene oxide were as follows: polyether polyol was 2.447 million tons, accounting for 64% of the total consumption; Used in propylene glycol is 824,000 t, accounting for 265,438+0.6%; Used in alcohol ether is184,000 t, accounting for about 4.8%; The consumption of other aspects is 368,000 t, accounting for 9.6%.

The main use of propylene oxide in China is also to produce polyether polyol and propylene glycol, and also to produce surfactants, propylene glycol ethers, propylene carbonate and so on. The application scope of propylene oxide in China is constantly expanding, and many downstream products of propylene oxide are in the development stage. In recent years, China's polyurethane and unsaturated polyester industry has developed rapidly, and many production lines have been introduced. They need about 654.38+600,000 tons of propylene oxide every year. 1995 The consumption of propylene oxide in China was188,000 t, and the output was only103,000 t. The gap was partly solved by importing downstream products of propylene oxide, such as polyether polyol, propylene glycol and polyurethane. 1995 the composition of propylene oxide consumption in China is as follows: polyether polyol consumption134,200t, accounting for 71.4%; The consumption of propylene glycol production is 29,700 tons, accounting for15.8%; The consumption of oilfield chemicals (demulsifiers) is 18200 t, accounting for 9.7%; The consumption of propylene glycol ether production is 380,000 tons, accounting for 2%; Others are 0.2 10000 t, accounting for 1. 1%.

After years of production and development, propylene oxide and its downstream products occupy a considerable position in the national economy and are irreplaceable products. China is a developing country, and its national economy is in a period of rapid development. According to statistics, from 1988 to 1995, the annual growth rate of propylene oxide consumption in China was 28%. It is predicted that by the year 2000, the production capacity will reach about 300,000 tons, and the consumption will reach 255,000 ~ 260,000 tons, with broad market prospects. 4.3 Suggestions.

At present, the output of propylene oxide in China cannot meet the domestic market demand. It is suggested that qualified enterprises introduce foreign advanced technology, adopt relatively pollution-free production methods, carry out large-scale production, focus on the development and production of polyether polyol, polyurethane and propylene glycol ether, especially vigorously develop polyurethane industry and promote the production of propylene oxide. In addition, attention should be paid to the development of foreign markets for downstream products of propylene oxide to promote the sustainable development of propylene oxide. 5 chloroacetyl chloride

Chloroacetyl chloride is an important organic intermediate, which is widely used in pesticide, medicine, dyes, additives and other fields. It can also be used as solvent, refrigerant, fire extinguishing agent, etc. It is mainly used to synthesize chloroacetamide herbicides and thiophosphate insecticides. 5. 1 production overview

At present, the production capacity of chloroacetyl chloride in the world has reached 200,000 t/a, and the annual output exceeds 65,438+10,000 t. According to the classification of raw materials, there are three industrial preparation processes of chloroacetyl chloride: direct chlorination with acetic acid, chlorination with chloroacetic acid and chlorination with diketene. Most foreign manufacturers use the most advanced diketene chlorination method. The main manufacturers are: Monsanto and Dow Chemical Company; BASF and Bayer, Germany; Rona Planck Collor; Japan's Tokuyama and Dasailuo Company; Ciba-Cargill in Switzerland, etc.

China has been researching and developing chloroacetyl chloride since the early 1970s. The production capacity of 65,438+0,990 is only 65,438+0 kt/a, which has made great progress in recent years. At present, the production capacity is about 1 1,000 t/a, but most manufacturers use chloroacetic acid and phosphorus trichloride chlorination process to produce, the scale is very small, and the product quality is unstable. Enterprises with production capacity exceeding 0.3kt/a include: Tianjin Dagu Chemical Plant, Zhejiang Haining Xugang Chemical Plant, Shandong Linzi Zhongqi High-tech Company, Jiangsu Rugao Organic Chemical Plant, Henan Puyang chlor-alkali plant, Nanjing Daxin Chemical Co., Ltd. and Liaoning Fuxin Organic Chemical Plant. 5.2 Market Overview

The global annual demand for chloroacetyl chloride exceeds 654.38+million tons, which is mainly used for pesticides, producing chloroacetamide herbicides, dithiophosphate insecticides and acetanilide systemic fungicide, accounting for more than 50% of the total consumption. N- amino -2-(4- pyridylamino) acetamide is used in the pharmaceutical industry to produce diclofenac, stabilize and inhibit ulcers, accounting for about 30% of the total consumption. Chloroacetyl chloride can also be used to synthesize dyes, flame retardants, lubricants, surfactants, military toxic gases and so on. The total consumption of these products is about 20%. At present, the supply and demand of chloroacetyl chloride abroad are roughly balanced, and the price is stable, so there will not be much fluctuation in the near future.

At present, the main market of chloroacetyl chloride in China is the pharmaceutical industry.

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Chemical technology and economic assistance

Volume 18

Economics of chemical technology

The manufacturer consumes about 700t t. According to the prediction of relevant experts, the demand for chloroacetyl chloride in the pharmaceutical industry will increase at an average annual rate of 4% ~ 5%. By 2000, the demand for chloroacetyl chloride in pharmaceutical industry will reach 1.3 ~ 1.4 kt.

In terms of pesticides, the consumption of chloroacetyl chloride in China is far from that in foreign countries. The variety and quantity of pesticides in China can not meet the needs of agricultural production development, especially herbicides, which only account for about 15% of the total pesticide output, far below the world average of 44% of the total pesticide output. At present, China is adjusting the variety structure of pesticides and increasing the proportion of herbicides, so the consumption potential of chloroacetyl chloride in pesticide production is huge. However, due to the depression of domestic pesticide industry in recent years, the demand growth rate of chloroacetyl chloride is not as high as predicted in previous years, and the high price of chloroacetyl chloride restricts its application in pesticides. It is estimated that by the year 2000, the demand for chloroacetyl chloride in China pesticide industry will reach more than 5kt.

The application and development of chloroacetyl chloride in other industries in China are less, mainly used in dyes, so it is estimated that the demand for chloroacetyl chloride in other industries will be around 1kt by 2000.

To sum up, it is estimated that the total domestic demand for chloroacetyl chloride will be 7 ~ 8 kt by 2000, but the future development trend is promising. 5.3 Suggestions

In recent years, there is a certain gap in chloroacetyl chloride in China, and the domestic production technology is backward, the scale is small, and the product quality is unstable, especially the content of dichloroacetyl chloride is too high.

It is suggested that qualified chlor-alkali enterprises adopt advanced diketene synthesis process for large-scale production, and vigorously develop their downstream products, improve quality and increase exports. 6 concluding remarks

Several important chlorine-based fine chemical intermediates are briefly introduced above. In the future, chlor-alkali enterprises should not only make use of resource advantages to produce products with bright market prospects, but more importantly, take these intermediates as raw materials, vigorously develop derivative products, carry out deep processing, and develop and cultivate chlorinated paraffin trees, benzyl chloride trees, propylene oxide trees, p-dichlorobenzene trees, chloroacetyl chloride trees, chlorinated benzene trees and epichlorohydrin trees. Chlor-alkali enterprises should break through the old ideas and fully understand the connotation of fine chemical product tree, not only to increase the product scale, but also to adjust the product structure, improve product quality, increase varieties, engage in one-stop production, implement the generalization of downstream products and equipment, and establish multi-functional workshops. This can not only form a scale advantage on the whole, but also form a flexible mode of production and operation, reduce intermediate links, reduce costs and improve quality. This is an effective way to improve the economic benefits of chlor-alkali enterprises.

Development of fine chemicals in chlor-alkali industry

Liangcheng

(Nanjing Chemical Plant, Nanjing, 2 10038)

Current production and market situation

This paper introduces the chemical intermediates needed for the development of chlor-alkali industry in China. Chloroacetyl chloride; Benzyl chloride; P-dichlorobenzene; 1, 2- propylene oxide; chloroacetyl chloride

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