Taking the technology of producing ethylene glycol from syngas jointly developed by Huisheng Project and Tianjin University as an example, the domestic technology of producing ethylene glycol from syngas mainly has the following characteristics and advantages: a. Obtaining important physical data of unconventional substances involved in producing ethylene glycol from coal through experiments, such as nitrite and oxalate, thermodynamic parameters, solubility and interaction parameters;
B. Binary and multivariate interaction parameters during the separation of oxalate, carbonate, methanol, ethylene glycol and 1, 2- butanediol: a. Two generations of oxalate synthesis catalysts:
The first generation of traditional granular alumina supported palladium catalyst (industrial catalyst) has palladium loading of about 0.6%wt, oxalate selectivity of 98.5%, space-time yield of more than 700g/Lcat/h and service life of more than 2 years.
The second generation monolithic palladium catalyst ensures the performance of the catalyst, but the palladium loading is only 0. 15%wt, and the bed resistance of the catalyst is greatly reduced.
B. Oxalate hydrogenation catalyst:
Industrial scale preparation of Cu/SiO2 _ 2 catalyst powder with high activity, high selectivity and high stability;
The first generation of flake hydrogenation catalyst has the characteristics of high strength and good stability.
The second generation stripping hydrogenation catalyst (industrial catalyst), after 4700 hours' service life assessment, shows that the conversion rate of oxalate 100%, the selectivity of ethylene glycol is greater than 95%, the space-time yield is greater than 300g/Lcat/h, the initial temperature 185℃, and the average heating frequency 1.5℃/ month.
The third generation monolithic hydrogenation catalyst further eliminated the influence of external diffusion, and the activity and stability of the catalyst were much better than that of the second generation strip hydrogenation catalyst.
C. All the above catalysts are prepared and produced on an engineering scale, with1100t catalyst production line; A. The higher pressure in the oxalate synthesis process reduces the system volume; The operation flexibility of oxalate synthesis cycle is high, the recovery rate of nitrite is as high as 95%, and the amount of NO supplement is low. NO is directly supplemented, the process is more stable, sodium nitrate is by-product, and there is no wastewater discharge;
B. Unique low-energy-consumption separation scheme for polyester-grade ethylene glycol products: the polyester-grade ethylene glycol products can be obtained by using component cutting method and only four towers for rectification, which saves more than 20% energy compared with the traditional ethylene glycol separation scheme;
C. Wider principles and specification requirements: the requirements for CO and H2 are wider, as long as the concentration exceeds 98%, and there is no requirement for CO2, CH4 and N2 in CO and CO2, CH4 and N2 in H2;
D. Product diversification of oxalate synthesis route and development of downstream products of oxalate: At present, the related products and process routes of coal-to-ethylene glycol have been successfully developed, including coal-to-fuel ethanol, synthesis of oxalic acid, dimethyl carbonate, diphenyl carbonate and so on.
E. Complete analysis and monitoring scheme: realize the combination of online monitoring and process control, reduce the number of operators while ensuring the stability of the process, and avoid the potential danger caused by human error. Tianjin University has 1 engineering technicians from laboratories to pilot projects to demonstration projects, which can provide detailed and safe driving guidance and technical support services for enterprises.
With its rich EPCM and production experience, Wison Engineering can provide the owners with perfect engineering-related services and production training in coal gasification, purification and separation.
It has thousand-ton and ten-thousand-ton equipment bases as training bases for core technologies of coal-based ethylene glycol. Since 1987, the long-term and continuous research work of coal-based ethylene glycol and related basic research has been carried out, and the engineering scale-up process from laboratory test, ton model test, 100-ton pilot plant to 10,000-ton demonstration project has been studied completely;
A. key national science and technology projects in the ninth five-year plan;
B. National "Eleventh Five-Year Plan" science and technology support projects;
C1000t yellow phosphorus tail gas production of oxalate, oxalic acid and ethanol project;
D. ethylene glycol production project from 10,000 tons of synthetic gas; There are 19 authorized patents and 3 international PCT patents in catalyst, process, separation and related technologies.
Conventional catalyst for gas-phase coupling of carbon monoxide to oxalate and its preparation method, ZL20 10.
Regular structure catalyst for preparing ethylene glycol from oxalate hydrogenation and its preparation method, ZL20 10.
Catalyst for synthesizing oxalate from low-pressure gas-phase carbon monoxide and its preparation method, ZL2007
Method for preparing oxalate by cobalt coupling ZL2007
Catalyst for hydrogenation of oxalate to ethylene glycol and its preparation method, ZL 2007
Preparation of Oxalate by Catalytic Cycle of Gas Phase CO Coupled Regeneration, ZL96109811.2
Catalyst for hydrogenation of acetate to ethanol and its preparation method, ZL20 12.
Hydrogenation of acetate to ethanol, ZL20 12.
Catalyst for hydrogenation of oxalate to ethanol and its preparation method and application, ZL20 1 1
Preparation methods of methylphenyl oxalate and diphenyl oxalate, ZL02 1292 13.2.
Synthesis of methyl phenyl oxalate and diphenyl oxalate catalyzed by supported metal oxides, ZL02 1292 12.4.
Synthesis of Diphenyl Oxalate from Oxalate and Phenol