METHOD FOR PRODUCTION OF ETHYLENE CARBONATE AND ETHYLENE GLYCOL Russian patent published in 2022 - IPC B01D53/02 B01D53/70 C07C29/10 C07C31/20 C07D317/38 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for the production of ethylene glycol and/or ethylene carbonate. The method includes following stages. First, at least part of a recirculating gas flow containing alkyl iodide impurity with a protective layer system located before a reactor for ethylene oxide production is brought into contact to obtain a purified recirculating gas flow, wherein the specified protective layer system contains protective layer material containing silver on aluminum oxide. Then, a flow of raw materials for epoxidation, containing a raw ethylene flow, oxygen, a chloride regulator, and at least part of the purified recirculating gas flow, is brought into contact with an epoxidation catalyst in the reactor for ethylene oxide production to obtain a product of an epoxidation reaction, containing ethylene oxide. Next, at least part of the product of the epoxidation reaction, containing ethylene oxide, is brought into contact with a liquid absorbent in the presence of an iodide-containing catalyst in an absorber to obtain a flow of a product containing ethylene carbonate and/or ethylene glycol and a recirculating gas flow containing alkyl iodide impurity. At the same time, the flow of raw materials for epoxidation, containing the raw ethylene flow, oxygen, the regulator compound, and the purified recirculating gas flow brought into contact with the epoxidation catalyst in the ethylene oxide reactor, contains from 1500 to 8000 ppm vol. (million volume parts) of ethane. In this case, a vinyl chloride regulator is added to the flow of raw materials for epoxidation, wherein the concentration of the vinyl chloride regulator added to the flow of raw materials for epoxidation is regulated so that a coefficient I showing a relative number of particles of the chloride regulator present in the flow of raw materials for epoxidation, which is determined according to the equation coefficient I = ([vinyl chloride]+[ethyl chloride]+[methyl chloride]/3)/([ethylene]+70*[ethane]), is 0.02-0.4.

EFFECT: proposed method allows for minimization of the formation of alkyl iodide impurities in a recirculating gas flow.

7 cl, 1 dwg, 1 tbl, 1 ex