12-03-2020 дата публикации
Номер: US20200079712A1
Принадлежит:
Processes and associated reaction systems for the preparation of ethylene carbonate and ethylene glycol from ethylene oxide are provided, particularly processes and associated reaction systems directed to heat integration in the treatment of recycle gas streams. 1. A process comprising{'b': 14', '15', '20, 'supplying an ethylene oxide absorber overhead stream () to a condenser () to produce a cooled recycle gas stream () and one or more aqueous streams,'}{'b': 20', '30, 'heating at least a portion of said cooled recycle gas stream () to provide a heated recycle gas stream (),'}{'b': 30', '31', '2', '36, 'contacting said heated recycle gas stream () with one or more guard bed materials in one or more guard bed systems () positioned upstream of an ethylene oxide reactor () to provide a treated recycle gas stream (),'}{'b': 1', '36', '2', '4, 'contacting an epoxidation feed gas () comprising ethylene, oxygen and at least a portion of said treated recycle gas stream () with an epoxidation catalyst in ethylene oxide reactor () to yield an epoxidation reaction product stream (),'}{'b': 4', '9', '10', '13', '14, 'contacting the epoxidation reaction product stream () in an ethylene oxide absorber () with a lean absorbent stream () in the presence of a carboxylation and hydrolysis catalyst to yield a fat absorbent stream () comprising ethylene carbonate and/or ethylene glycol and an ethylene oxide absorber overhead stream (),'}{'b': '20', 'wherein cooled recycle gas stream () is heated by heat exchange with a hot process stream selected from'}{'b': 14', '15, '(i) the ethylene oxide absorber overhead stream (), in a condenser ();'}{'b': 24', '15, '(ii) steam () produced in an ethylene glycol purification column overhead condenser, in a first heat exchanger located downstream of condenser ();'}{'b': 25', '15, '(iii) steam () produced by flashing one or more condensate streams collected in the process, in a second heat exchanger located downstream of condenser (), or a ...
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