Invention Grant
- Patent Title: Method for producing carbamate, method for producing isocyanate, carbamate production system, and isocyanate production system
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Application No.: US14520112Application Date: 2014-10-21
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Publication No.: US09321024B2Publication Date: 2016-04-26
- Inventor: Koji Takamatsu , Satoshi Kato , Takeshi Fukuda , Tetsuya Nakano , Masaaki Sasaki
- Applicant: MITSUI CHEMICALS, INC.
- Applicant Address: JP Tokyo
- Assignee: MITSUI CHEMICALS, INC.
- Current Assignee: MITSUI CHEMICALS, INC.
- Current Assignee Address: JP Tokyo
- Agency: Foley & Lardner LLP
- Priority: JP2010-137642 20100616; JP2010-137643 20100616
- Main IPC: B01J12/00
- IPC: B01J12/00 ; C07C263/04 ; C07C269/04 ; C07C273/04 ; C07C273/00 ; C07C273/02
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.
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