Pta English [? Pi? ti e？ ] beauty [? Pi? ti e？ ]
Purified terephthalic acid; Terephthalic acid; Prothrombin activity; Percutaneous transluminal angioplasty; Pure terephthalic acid
Oxford English dictionary
noun
Parent-teacher Association (PTA)
Abbreviation for "Parent-Teacher Association" (a group managed by parents and teachers in a school that organizes social activities and helps the school in different ways)
Bilingual example
1、
Present situation and development trend of PTA production in China?
Production status and development trend of purified terephthalic acid in China
2、
Determination of b value of terephthalic acid by spectrophotometry?
Determination of b~ (2+) value of purified terephthalic acid for industrial use by colorimeter
3、
The PTA helped a lot. ?
The parents' meeting helped a lot.
4、
Then, they asked the students to vote for one of them and support the school board or the PTA. ?
Then ask the students to choose a school director or the chairman of the parent-teacher conference.
5、
Mrs Slocombe from the parent-teacher conference. ?
Not Ms. Sloan from the parent-teacher conference
PTA is terephthalic acid, which is the raw material of chemical fiber. The relative molecular weight of raw materials for producing polyester is 166. 13, and the structural formula is HOOC[C6H4]COOH. White powdery crystal at room temperature, non-toxic, flammable. If mixed with air, it will burn in case of fire within a certain limit.
Polyethylene terephthalate (PET) is obtained by polycondensation of high-purity PTA with ethylene glycol (EG), and can also react with 1, 4- ethylene glycol or 1, 4- cyclohexanedicarboxylic acid to generate the corresponding ester, which is mainly used to produce polyester. Polyester fiber is the most important variety of synthetic fiber, accounting for nearly 80% of the total output of synthetic fiber in the world. In China, the polyester fiber produced from polyester has exceeded 80% of the total synthetic fiber output. In addition, the amount of PTA consumed by polyester in the production of non-fiber products has increased rapidly recently, and the amount of polyester in the non-fiber field has also continued to increase. At present, the products are mainly used for esterification polymerization with ethylene glycol to produce polyester fibers with short polyester chips, which are widely used in textiles. In addition, polyester is also used to produce films, paints and polyester plastics.
The application of PTA is relatively concentrated. More than 90% of PTA in the world is used to produce polyethylene terephthalate, and the rest is used as raw materials for products such as polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT).
PTA production process can be divided into two parts: oxidation unit and hydrofining unit. Using acetic acid as solvent, raw material p-xylene is oxidized into crude terephthalic acid by air under the action of catalyst, and then the crude product is obtained by crystallization, filtration and drying in turn. Crude terephthalic acid is hydrogenated to remove impurities, then crystallized, centrifugally separated and dried to obtain PTA products.
Purified terephthalic acid is the main raw material for producing polyester fiber, resin, film and container resin, which is widely used in chemical fiber, container, packaging and film production. The raw material of PTA is xylene, and the raw material of xylene is petroleum. PTA is the raw material of polyester, and polyester is the raw material of polyester, while chemical fiber is 80% polyester, and chemical fiber accounts for 36% of the raw material of textile industry.
China's demand for PTA futures
At present, there are no PTA futures varieties abroad. China is the largest PTA consumer market in the world, and its import dependence is about 50%. The introduction of PTA futures will help all parties concerned avoid the risk of price fluctuation and further compete for the pricing power of PTA.
At present, China is the largest PTA consumer market in the world. Last year, China's PTA output was 5.5 million tons, and its consumption exceeded 6.5438+million tons. It is estimated that the demand will reach170,000 tons by 2065.438+00, and a large part of the domestic PTA market needs to be imported to make up for it. Due to the expansion of market demand and the rise of oil price, the PTA market price has been rising in recent years. Due to the lack of hedging tools, related enterprises bear great market risks.
PTA is the abbreviation of purified terephthalic acid, and it is one of the important bulk organic raw materials. Its main use is to produce polyester fiber (polyester), polyester bottle chips and polyester films, which are widely used in chemical fiber, light industry, electronics, construction and other aspects of the national economy and are closely related to people's living standards. PTA futures, that is, the dominant trading variety with phthalic acid as the subject matter, is a futures variety listed on Zhengzhou Commodity Futures Exchange.
PTA industrial chain distribution
The application of PTA is relatively concentrated. More than 90% of PTA in the world is used to produce polyethylene terephthalate (PET), and other parts are used as raw materials for polypropylene terephthalate (PTT), polybutylene terephthalate (PBT) and other products.
PTA production process can be divided into two parts: oxidation unit and hydrofining unit. The raw material PX is oxidized into crude terephthalic acid by air with acetic acid as solvent under the action of catalyst, and then the crude product is obtained by crystallization, filtration and drying in turn. Crude terephthalic acid is hydrogenated to remove impurities, then crystallized, centrifugally separated and dried to obtain PTA finished products.
brief introduction
Domestic PTA production technology and equipment are imported, and the products of different manufacturers, whether state-owned enterprises, private enterprises or imported, are very consistent in quality. In 2005, the National Development and Reform Commission issued a document recommending the enterprise standard 1995 from the national level.
Purified terephthalic acid for industrial use (SH/T1612.5438+0-2005)
range
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and safety requirements of industrial terephthalic acid.
This standard is applicable to industrial PTA which is refined by oxidation of petroleum p-xylene. This product is mainly used as raw material for producing polyester chips, long and short polyester fibers and chemical products.
Molecular formula: C8H6O4
Relative molecular mass: 166. 13 (according to international relative atomic mass 200 1)