Differences in the ethylene glycol process

Let’s see if anyone knowledgeable knows this @WisdomBright @FullyDeserved @ylb913

I’m hoping experts can give me some advice; I really want to discuss and learn about these issues with everyone!

In China, EOEG seems to have three process packages currently: one from Dow, one from Shell, and one from a company specializing in scientific design.

You are referring to the petrochemical route. They’re asking about the coal chemical route: lol

I was wrong, my apologies; P; P; P

:lol:lol, there’s no right or wrong. The moderator should work at a petrochemical plant

I work in an engineering company; I have worked on two process packages for Shell and Scientific Design Company

Mark it, learn*learn*: lol

5.1.1 Principle of oxidative esterification: NO and oxygen in the recycled gas react in the esterification pre-reactor to form N2O3. N2O3 then enters the esterification tower where it reacts with methanol to produce MN, while by-products such as HNO3, HNO2, and HCHO are also generated. (1) Oxidation reactions: NO + 0.5O2 = NO2; NO2 + NO = N2O3
(2) Esterification reaction: 2CH3OH + N2O3 = 2CH3ONO + H2O
Overall equation: 2CH3OH + 2NO + 0.5O2 = 2CH3ONO + H2O
(3) Side reactions: 3NO2 + H2O = 2HNO3 + NO; CH3ONO + H2O = CH3OH + HNO2; CH3OH + NO2 = HCHO + NO + H2O; CH3OH + O2 = 2HCHO + 2H2O
5.1.2 Principle of carbonylation: Carbon monoxide (CO) and methyl nitrite (MN), under certain temperature, pressure conditions and in the presence of a catalyst, produce dimethyl oxalate (DMO); simultaneously, by-products such as dimethyl carbonate (DMC) and methyl formate (MF) are formed, along with heat release. (1) Main reaction: 2CO + 2CH3ONO → (COOCH3)2 + 2NO
(2) Side reactions: CO + 2CH3ONO → CO(OCH3)2 + 2NO; 4CH3ONO → HCOOCH3 + 2CH3OH + 4NO2; NO + H2 → N2O + H2O
(3) Principle of catalyst activation: PdO + CO → Pd + CO2