10 issues that should be paid attention to in the coal-to-ethylene glycol project
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This post was last edited by ch3ohnh3 on 2010-5-31 20:15 Coal-to-ethylene glycol is rising in my country. Coal-to-ethylene glycol mainly uses CO oxidative coupling to generate dimethyl oxalate, and then hydrogenates dimethyl oxalate to generate ethylene glycol. However, in actual production or recent project establishment, attention must be paid to understanding the technology maturity, engineering and product series issues! 1. The reaction temperature range of dimethyl oxalate synthesis is narrower than that of methanol synthesis, and the operating pressure is only about 0.5MPa. At the same time, the circulating gas volume is large, so it is particularly important to reduce the reactor resistance. For example, a horizontal water-cooled reactor can be considered, and its tower resistance is significantly lower than that of a shell-and-tube tower. 2. Process and equipment for catalytic coupling of nitrite esters to synthesize oxalate esters, strong heat release, and reaction control. NO gas preparation and recycling process (theoretically no NO consumption). Nitrite regeneration reaction technology and equipment, gas-liquid reaction gas film control, heat transfer. Oxalate ester hydrogenation process and equipment (the hydrogen-to-ester ratio of the reaction is 60 to 100), (strong exothermic reaction, narrow catalyst temperature zone). 3. High-concentration CO dehydrogenation process must avoid combustion and explosion and reduce CO loss. 4. Product quality issues. Different from the reaction process of the ethylene route, the complete analysis of the products of the carbon-one route and the polymerization application test of industrial-scale products need to be strengthened. 5. Hydrogenation catalyst life problem. The hydrogenation catalyst requires not to use chromium that is harmful to the human body, but also requires that the structure of the active component and carrier does not change or be lost. This is a contradiction. 6. Content control of precious metal components in the synthesis of oxalate ester reaction catalysts and hot spot control issues during the reaction process. 7. Engineering scale-up issues for raw material CO dehydrogenation reactors, catalytic coupled carbonylation reactors, nitrite ester regeneration reactors, and hydrogenation reactors (for example, the TL plant has an annual output of 150 kt of ethylene glycol using 6 carbonylation reactors and 6 hydrogenation reactors, and the reactor engineering scale-up issues have not yet been solved) 8. NO regeneration and circulation issues. It is required not to generate HNO3.9, reduce side reactions in each reaction step, and increase the overall reaction yield. 10 product serialization: Producing oxalic acid simultaneously with ethylene glycol production ； While producing dimethyl oxalate, dimethyl carbonate is produced and is linked to the production of diphenyl carbonate and polycarbonate. In fact, whether these views and opinions are original is not the key to the discussion, but it is that you can’t bear to see various places and related companies investing huge sums of money in coal to produce ethylene glycol. Do you have a thorough understanding of the technical principles? Of course, it has something to do with public opinion, including the recent ethylene glycol conference, etc., but there are few substantive issues discussed. However, as investors, shareholders or venture capital companies, we very much hope to understand the maturity of technology and engineering design, rather than just understanding its market and development trends!
Man, are you making ethylene glycol from coal? It looks so familiar!
Recommendation 10 deserves great attention, as it is crucial for the design of reactors and separation equipment and the arrangement of industrial processes.
Reply 3# pecker Coal-to-ethylene glycol catalysts have been developed by many domestic companies (such as the Institute of Physics of the Chinese Academy of Sciences, Shanghai Coking Company, East China University of Science and Technology, Tianjin University, Hubei Institute of Chemistry, Shanghai Institute of Petrochemicals, etc.), and a certain institute that has never been reported has achieved better results in small tests and model tests. Most equipment, valves, control systems and instruments such as DMO (dimethyl oxalate) synthesis reactors and hydrogenation reactors can be manufactured domestically. However, such as the circulating gas compressor of the oxo synthesis unit, the circulating gas compressor of the hydrogenation unit, the feed high-speed pump, the quick shut-off valve, and the online analyzer can be considered imported from abroad.
The poster's post is very professional, indicating that the poster has great attainments in this industry, or is a direct technical development expert in pyrotechnic pipe technology. You may wish to leave your contact information for private consultation.
The development of coal chemical industry has indeed reached a watershed. The mature project market is not good, and there are big problems with technology that has market demand. As the first floor said, when it comes to ethylene glycol projects, everyone still needs to be cautious and more cautious.
Reply 6# nicegogo is rushing to be the first to seize the market, so that there will be more profits in the future, and the leaders can also approve large projects.
There is still room for improvement in coal-to-ethylene glycol technology. Product quality, raw material consumption, and comprehensive utilization of by-products all require a lot of effort. There are also difficulties in environmental protection and three wastes that need to be overcome. At present, large domestic capital groups and coal mining companies are entering this field with high profile. On the one hand, it shows that everyone is optimistic about the prospects of this technology. On the other hand, it also shows that there are few investment channels and few things to develop, especially the downstream industrial chain of coal chemical industry. I am also worried that after the technology is really industrialized, it will become a low-end product like other coal chemical products. Acetic acid is a good example.
Coal-to-ethylene glycol is a good concept, and it is also a development direction for the coal chemical industry. However, since the coal chemical industry itself has a relatively short and narrow industrial chain, high energy and material consumption, and a large amount of CO2 emissions during the production process, more articles on combination should be done. Organic combination with natural gas, petrochemicals, and heat and electricity polygeneration may be more in line with the general trend hahah.
Reply 1# ch3ohnh3 The original poster has been very helpful in this regard. His summary of the technology is very pertinent. Learn from it.* .