公开(公告)号：US09669360B2

公开(公告)日：2017-06-06

申请号：US14960662

申请日：2015-12-07

Applicant: SAIPEM S.p.A

Inventor： Paolo Casara ,  Alessandro Gianazza

IPC: C02F1/02 ,  B01D3/02 ,  B01D3/14 ,  B01D35/18 ,  B01D61/36 ,  C01C1/10 ,  C07C273/04 ,  C02F1/04 ,  C02F1/44 ,  C02F101/10 ,  C02F101/16 ,  C02F103/36

CPC classification number: B01D61/364 ,  B01D2313/22 ,  C01C1/10 ,  C02F1/04 ,  C02F1/44 ,  C02F1/447 ,  C02F2101/10 ,  C02F2101/16 ,  C02F2103/36 ,  C07C273/04

Abstract: The present invention relates to a method for contemporaneously recovering ammonia and carbon dioxide from an aqueous solution thereof, possibly comprising their condensates, in a synthesis process of urea, characterized in that it comprises a hydrophobic microporous membrane distillation phase of an aqueous solution comprising ammonia, carbon dioxide and their saline compounds or condensates, said distillation being carried out at a temperature ranging from 50 to 250° C. and a pressure ranging from 50 KPa to 20 MPa absolute, with the formation of a residual aqueous solution, possibly comprising urea, and a gaseous permeate stream, comprising ammonia, carbon dioxide and water. The present invention also relates to an apparatus for effecting the above method and a production process of urea which comprises the above method.