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[Chemical Knowledge]：Production process and preparation method of ethylene glycol

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Ethylene glycol, also known as 1,2-ethylene glycol, is an important chemical raw material. Its chemical formula is C2H6O2 and its molecular weight is 62.07. Ethylene glycol has good solubility, volatility and hygroscopicity, and is widely used in the manufacture of polyester, plastics, coatings, solvents and many other fields. In order to meet the market demand, many enterprises are now producing ethylene glycol. This article will introduce the production process and preparation method of ethylene glycol. Production of ethylene glycol

1. alcoholization

alcoholization is an important method for the production of ethylene glycol. It is by the hydroxyl of ethylene glycol with methanol or ethanol alcohol reaction to produce ethylene glycol. The following is the specific production process:

first mix a certain proportion of methanol or ethanol and water and add it to the reactor. Next, ethylene and air are passed into the reaction vessel at a certain temperature (typically 200°C). Thus, ethylene and air are oxidized by the V2O5 catalyst having a refractive index of 1.9 to produce by-products such as acetaldehyde and propionaldehyde. On this basis, acetaldehyde and propionaldehyde are hydrolyzed to produce ethylene glycol and 1,3-propanediol. Finally, the ethylene glycol product with a purity of more than 99.5% can be obtained by separation and purification.

, it is worth noting that the production of ethylene glycol by alcoholization method needs to use V2O5, NiO and other catalysts, so the regeneration and protection of the catalyst are needed in the reaction process. In addition, the operating temperature, pressure and other conditions of the reactor also need to be strictly controlled to ensure the efficiency of the reaction and product quality.

2. one-step production of ethylene glycol

one-step production of ethylene glycol is a new production process. Different from the traditional alcoholization method, it is through the synthesis reaction of ethylene and CO, and then hydrogenation and hydration reaction to directly produce ethylene glycol. The following is the specific production process:

first mix ethylene and CO into the reactor. At a certain temperature (generally 190-230 ℃), pressure (generally 15-30MPa) and the action of ZnO, Cu, CrO3 and other catalysts, the synthesis reaction occurs to generate blue compounds such as Prussian blue. At this time, hydrogenation and hydration reactions are required to convert it to ethylene glycol. Finally, through distillation, extraction and other steps of purification, can be obtained to meet the requirements of ethylene glycol products.

one-step production of ethylene glycol has an advantage over the alcoholization method in that the reaction process is simple, and the production of by-products and the consumption of resources can be reduced. However, the process still faces some technical difficulties, such as the selection of catalysts, the control of reaction temperature and pressure, and other aspects need to be continuously optimized.

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