- 专利标题： Method for producing carbamate, method for producing isocyanate, carbamate production system, and isocyanate production system
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申请号： US14520112申请日： 2014-10-21
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公开(公告)号： US09321024B2公开(公告)日： 2016-04-26
- 发明人: Koji Takamatsu , Satoshi Kato , Takeshi Fukuda , Tetsuya Nakano , Masaaki Sasaki
- 申请人： MITSUI CHEMICALS, INC.
- 申请人地址： JP Tokyo
- 专利权人： MITSUI CHEMICALS, INC.
- 当前专利权人： MITSUI CHEMICALS, INC.
- 当前专利权人地址： JP Tokyo
- 代理机构： Foley & Lardner LLP
- 优先权： JP2010-137642 20100616; JP2010-137643 20100616
- 主分类号： B01J12/00
- IPC分类号： B01J12/00 ; C07C263/04 ; C07C269/04 ; C07C273/04 ; C07C273/00 ; C07C273/02
摘要：
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.
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