Patent ID: 9266745
Filing Date: 2016-02-23
CPC Classification: B01D,C01C,C02F,C07C

Claim Text:
1. A method for contemporaneously recovering ammonia and carbon dioxide from an aqueous solution in a urea synthesis process, the method comprising distilling on a hydrophobic microporous membrane the aqueous solution comprising ammonia, carbon dioxide and, optionally, a saline compound or a condensate thereof, at a temperature of 50 to 250° C. and at a pressure of 50 KPa to 20 MPa absolute, to obtain a residual aqueous solution, optionally comprising urea, and a permeated gaseous stream comprising ammonia, carbon dioxide and water, wherein the aqueous solution is a recycled solution from a urea production process or an effluent coming from a urea synthesis reactor, and the aqueous solution comprises 20 to 70% by weight of ammonia, 10 to 60% by weight of carbon dioxide and 10 to 70% by weight of water.