METHOD FOR PRODUCTION OF ETHYLENE CARBONATE AND ETHYLENE GLYCOL, USING PROTECTIVE LAYER SYSTEM FOR REMOVAL OF ALKYL IODIDE 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 a number of stages. First, at least part of a recirculating gas flow containing alkyl iodide impurity is brought into contact with a protective layer system located before a reactor for ethylene oxide production to obtain a purified recirculating gas flow, wherein the specified protective layer system contains protective layer material containing silver on aluminum oxide. Then, a raw gas flow containing ethylene, oxygen, and at least part of the purified recirculating gas flow are 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 an aqueous adsorbent in the presence of an iodide-containing catalyst in an absorber to obtain a water 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 recirculating gas flow supplied to the protective layer system contains (a) from 0.1 to 0.59 mol.% of water and/or (b) from 5 to 90 ppm vol. of ethylene oxide relatively to the total recirculating gas flow supplied to the protective layer system. Water concentration in the recirculating gas flow is regulated using one or several of the following: a cooling medium type, a cooling device type, a cooling medium temperature, and amount of the cooling medium used for cooling of the recirculating gas flow coming out of the absorber. Ethylene oxide concentration in the recirculating gas flow supplied to the protective layer system is regulated using one or several of the following: regulation of ethylene oxide concentration in a flow of the product of the epoxidation reaction, an absorber temperature, absorber pressure, a catalyst composition, a number of plates in the absorber, a shape of plates in the absorber, an absorbent flow, and an absorbent composition in the absorber.

EFFECT: proposed method allows for removal of alkyl iodide impurities from a recirculating gas flow in a protective layer system located before a reactor for ethylene oxide production.

5 cl, 2 dwg