Building industrial chain of coal chemical synthesis gas carbonylation in China

wallpapers Industry 2020-12-09

combines the process characteristics of coal chemical synthesis gas to create a synthetic gas carbonyl synthesis industrial chain, formulate a synthetic gas industrial chain roadmap, establish a research and development platform for the production of oxygenated (nitrogenous) compounds from syngas, so as to enhance the market competitiveness of coal chemical enterprises, and gradually achieve the goal of "letting all flowers bloom together." Li Guangxing, a professor at Huazhong University of science and technology, said recently.

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oxygen atoms "in and out" energy consumption and water consumption are high. What is the essential difference of

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coal, oil and natural gas chemical components? It's the difference between the hydrocarbon ratio and the oxygen content. What is the difference between petroleum processing and coal chemical primary processing? It is the difference between "oxygen free" catalytic cracking of crude oil processing and "oxygenation" gas production of coal Professor Li Guangxing said that at present, the introduction of oxygen atom in petroleum processing and coal chemical process has not attracted much attention, but it is precisely an important factor for high energy consumption, high material consumption, high water consumption and complex process route of coal chemical industry.

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Li Guangxing introduced that the oil catalytic cracking process is a carbon carbon bond rearrangement process, which is processed under oxygen free conditions, and all the products obtained are hydrocarbons. Coal chemical industry is a chemical process with oxygen addition and deoxidation as the main process. For example, coal to olefin (MTO) is a typical example. Coal is first gasified, and then oxygen atoms are introduced to produce syngas (CO H2). Then, methanol is synthesized through catalysis, and then the oxygen atoms added to methanol molecules are "pulled out" to obtain olefin products. In this way, MTO reaction is not an atomic economic reaction.

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for example, the Fischer Tropsch reaction is that coal is first gasified to obtain syngas, and then deoxidized to produce various hydrocarbon compounds, namely, all kinds of fuel oil. However, the process route of Fischer Tropsch reaction is long, and the energy consumption and water consumption are huge. It is reported that the water consumption of 5-10 million T / a units is far greater than 2000 t / h, and the problems such as large CO2 emission are difficult to solve. According to the law of conservation of materials, a large amount of carbon dioxide is bound to be released in the process of deoxidation to produce alkylates from syngas composed of carbon, hydrogen and oxygen. Moreover, after cooling, the syngas obtained by high-temperature gasification will rise to high temperature for Fischer Tropsch reaction. It is difficult to reduce energy consumption and water consumption if the temperature is raised and lowered repeatedly. Li Guangxing said.

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and "retaining" oxygen atom syngas extend downward.

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have been facing the dilemma of single product and market saturation in China's traditional coal chemical enterprises in recent ten years. How to realize transformation?

Professor Li Guangxing of

gave his opinion: there are still many synthetic ammonia enterprises to survive, and coal chemical enterprises in non coal rich areas also have advantages in synthetic gas resources and technology. They can fully utilize the characteristics of syngas to produce oxygen-containing and oxygen-containing nitrogen-containing compounds by carbonyl synthesis technology, and combine with large-scale polymer chemical materials, and gradually change from fuel type to fuel / chemical industry The green route of the combination of materials and materials is expanding and extending. Carbonyl products can be extended from alcohols, acids, esters, ketones, ethers, amides, acyl chlorides to the fields of chemical materials such as polycarbonate, polyester, polyketone and polyamide.

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how to expand and extend? It is necessary to combine the characteristics of coal chemical industry, take syngas as the starting point, pay attention to the development of downstream product chain of synthetic gas, especially the development of oxygen (nitrogen containing) compounds, give play to the role of syngas in promoting the industrial chain of organic chemicals, petrochemical products, polymer materials and pharmaceutical chemicals, and open up a new way for diversified development of coal chemical industry.

"the introduction of oxygen atoms, and then the" removal "of oxygen atoms is the fundamental reason why MTO and other routes do not have atomic economy. It is an idea to improve the atomic economy of coal chemical industry and the basis of building synthetic gas industry chain to retain oxygen atom and let it be used by us. At the same time, alcohol, acid, ester, amide, acyl chlorination, and chemical materials such as polycarbonate, polyester, polyketone and polyamide also have a huge market space. " Li explained.

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develop carbonyl synthesis industry chain. There are many routes of "a hundred flowers bloom",

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. According to introduction, carbonyl synthesis is an important reaction to introduce carbonyl group and other groups into organic compound molecules and become oxygen-containing compounds, which can produce dozens of oxygen (nitrogen) containing chemicals and polymer materials. In the 1970s and 1980s, some domestic experts put forward the idea of using syngas for carbonyl reaction, but it was not paid attention to.

"carbonyl synthesis route has high atomic economy, environmental friendliness, and has a good industrial foundation. It can become a bridge between coal chemical industry (carbon chemical industry), petrochemical industry and natural gas chemical industry, so it is favored by international academic and industrial circles. If the domestic coal chemical industry can give full play to its advantages in the synthesis of oxygen-containing (nitrogen-containing) compounds, it can complement each other with petrochemical products. " Li Guangxing said.

it is understood that the reaction substrates for carbonylation synthesis have been expanded to alkenes, alcohols, phenols, aldehydes, amines, nitro compounds, halides, etc., and the products are widely used in bulk chemicals, fine chemicals, special chemicals and polymer compounds such as polyketone, polyester, polycarbonate and polyamide. For example,

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have industrial application value in the carbonylation of olefins, the carbonylation of butadiene to adipic acid and the hydroformylation of butene to glutaraldehyde. The carbonylation of butadiene to adipic acid has the advantages of high yield and low cost of separation and purification. It can solve the problems of low yield, high energy consumption, large amount of waste acid and NOx emission in the traditional nitric acid oxidation process. The carbonylation of

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dimethyl ether to methyl acetate is also a route of great industrial value. Methyl / ethyl acetate was synthesized by vapor phase carbonylation of dimethyl ether in the presence of solid acid catalyst. Li Guangxing believes that this process can not only make full use of dimethyl ether produced by coal chemical route, but also provide a cheap and environment-friendly route for the production of acetate and acetic acid. It is expected to become the main alternative route for acetate products, and the market scale can reach millions of tons. The synthesis of propionic acid by hydroformylation of ethylene and Tertiary carbonate (Koch reaction) by carbonylation are also worthy of attention.

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also, the carbonyl synthesis of methyl methacrylate (MMA) synthesis process by the Chinese Academy of Sciences process Institute completed the technical development. The project takes syngas and ethylene as raw materials, through hydroformylation and aldol condensationMMA was prepared by oxidation and esterification. The product indexes prepared by this process all reached the standard of excellent products.

"now, many carbonyl synthesis projects have a certain foundation, with the scale from tens of thousands of tons to hundreds of thousands of tons. Moreover, its investment amount is only several hundred million yuan or more than one billion yuan. Many coal chemical enterprises can form organic chemical products or new chemical materials series through carbonyl synthesis, and innovate the process routes and series products with Chinese characteristics. Among them, we can focus on the research and development of new technologies for methanol homologous carbonylation to ethanol, dimethyl ether carbonylation to methyl acetate, direct carbonylation to DMO, olefin carbonylation to adipic acid, carbonylation to MMA, etc. Although the output of some tens of thousands of tons of products is small, but the added value is high, we should also pay attention to it. Of course, this also depends on the integration of the government, enterprises, scientific research institutes, universities and other forces to gradually build an industrial chain of carbonyl synthesis of syngas to form a "hundred flowers bloom" situation. At the same time, it is also expected that the domestic coal chemical industry will give in-depth discussion and attention to this Li Guangxing concluded. "


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