公开(公告)号：US09321024B2

公开(公告)日：2016-04-26

申请号：US14520112

申请日：2014-10-21

Applicant: MITSUI CHEMICALS, INC.

Inventor： Koji Takamatsu ,  Satoshi Kato ,  Takeshi Fukuda ,  Tetsuya Nakano ,  Masaaki Sasaki

IPC: B01J12/00 ,  C07C263/04 ,  C07C269/04 ,  C07C273/04 ,  C07C273/00 ,  C07C273/02

CPC classification number: B01J12/00 ,  C07C263/04 ,  C07C269/04 ,  C07C273/04 ,  C07C271/00 ,  C07C265/00

Abstract: A method for producing carbamate including a urea production step; a carbamate-forming step; an ammonia separation step of absorbing the gas with water in the presence of carbonate to produce a gas absorption water, and separating ammonia; an aqueous alcohol solution separation step of separating an aqueous alcohol solution from the gas absorption water; an ammonia/carbon dioxide separation step of separating carbon dioxide gas from the aqueous ammonia solution in the gas absorption water from which the aqueous alcohol solution is separated; an aqueous ammonia solution reusing step of mixing the aqueous ammonia solution and carbonate with the water to be used for production of the gas absorption water.