Problems with coal-based ethylene glycol, regarding **
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At the 2nd Annual Conference on Syngas-Based Ethylene Glycol Production, it was suggested that the CH4 contained in CO could be generated during esterification and carbonylation, and when mixed with oxygen it could pose a explosion hazard. Does anyone know anything about this?
**It’s nitromethane; is this also a sensitive term? ! !
It’s time to go to work on Monday. Does anyone know anything related to this?:victory::victory:
Nonsense. . . 1. The possibility of methane being carried over to the carbonylation stage is very low, as it has already been largely removed by PSA. 2. Oxygen is consumed in the lipidation system and can be carried over to the carbonylation step! ?
In PSA, the methane content is below 50PPM.
Perhaps I didn’t explain it clearly enough: under normal conditions, the amount of methane is very small, but if it isn’t separated properly, there is a risk that it will enter the carbonylation reactor. Nitromethane may be formed in the esterification reactor, where oxygen is definitely present. So I wonder what the control indicators for this system are.
Synthesis method 1: Gas-phase nitration of methane – A mist of dilute *ao acid is generated and vaporized, then mixed with preheated methane (natural gas) to maintain a certain ratio among *ao acid, methane, and water vapor. The mixture enters a tubular reactor using molten salt as the heating medium, where it is directly nitrated under normal pressure and at temperatures of 450–550°C. The reaction products are condensed and absorbed by water; the resulting **aqueous solution is distilled to obtain a crude product**, which is then purified through washing and distillation to yield the final product. Per ton of product, 5500 kg of industrial-grade *ao acid and 20,000 m3 of natural gas (CH4 > 95%) are consumed (under standard conditions). Firstly, it is difficult to reduce the CH4 content in CO to ppm levels; it is not negligible. Secondly, oxygen cannot be completely reacted away. Lastly, the normal production methods of nitromethane show that this reaction is thermodynamically feasible and kinetically favorable, and considering the role of catalysts, such a possibility does indeed exist
Complaining a bit: ××, you damn sensitive word
1. The methane content in the CO gas emitted from PSA is subject to control specifications. (Trade secret, sorry) It can basically be ignored. 2. Oxygen must be completely consumed in the lipidation system; it should be noted that the gas phase in this system is supplied in proportion, meaning that the oxygen content is controlled precisely – less is better than too much.
It’s described in vague terms; 1. The methane content in the feed gas is very low, at the PPM level. 2. The volume of circulating gas is very large and can be ignored.