METHOD OF PRODUCING ALKYLENE GLYCOL Russian patent published in 2013 - IPC C07C31/20 C07C29/12 C07D317/38 C07D303/04 C07D301/32 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing alkylene glycol, which can be used as a raw material in production of polyester fibres, polyethylene terephthalate plastic and resins. The method involves the following steps: (a) reacting alkene with oxygen in the presence of a catalyst in a reactor to obtain a gaseous composition containing alkylene oxide, alkene, oxygen, carbon dioxide and water vapour; (b) removing water from the gaseous composition; (c) feeding the gaseous composition from step (b) into an alkylene oxide absorber, feeding the spent absorbent into the alkylene oxide absorber, bringing the gaseous composition into contact with the spent absorbent in the alkylene oxide absorber in the presence of one or more catalysts which facilitate carboxylation at temperature ranging from 80 to 250°C, and removing the enriched absorbent from the absorber, where the spent absorbent contains at least 50 wt % alkylene carbonate and less than 10 wt % water, and where the spent absorbent is fed at temperature ranging from higher 60°C to 250°C; (d) feeding a portion of the enriched absorbent from step (c) into one or more hydrolysis reactors, feeding water into one or more hydrolysis reactors, bringing the enriched absorbent into contact with water in the presence of one or more hydrolysis catalysts in one or more hydrolysis reactors and removing the product stream from the one or more hydrolysis reactors; (e) feeding the product stream from step (d) into a dehydrator, removing water and obtaining a dehydrated product stream; and (f) cleaning the dehydrated product stream from step (e) and obtaining a purified alkylene glycol stream.

EFFECT: method reduces cost of production while ensuring selectivity of the process.

16 cl, 1 ex, 4 tbl, 6 dwg