Hydrogen generator and fuel cell system
US-9527055-B2 · Dec 27, 2016 · US
Method for producing carbamate, method for producing isocyanate, carbamate production system, and isocyanate production system
US9321024B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9321024-B2 |
| Application number | US-201414520112-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 21, 2014 |
| Priority date | Jun 16, 2010 |
| Publication date | Apr 26, 2016 |
| Grant date | Apr 26, 2016 |
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Abstract
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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.
First claim
Opening claim text (preview).
What is claimed is: 1. A carbamate production system comprising: a urea production apparatus for producing urea by reaction between ammonia and carbon dioxide gas, a carbamate-forming reaction apparatus for producing carbamate by carbamate-forming reaction between amine, the urea, and alcohol, and by-producing a gas containing alcohol, ammonia, and carbon dioxide, an ammonia separation apparatus for absorbing the gas with water to produce a gas absorption water, and separating ammonia, an aqueous alcohol solution separation apparatus for separating the aqueous alcohol solution from the gas absorption water, an ammonia/carbon dioxide separation apparatus for 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 apparatus for using the aqueous ammonia solution along with the water for production of the gas absorption water, an ammonia reusing apparatus for using, in the urea production apparatus, the ammonia separated in the ammonia separation apparatus and an alcohol reusing apparatus for separating alcohol from the aqueous alcohol solution and using the alcohol in the carbamate-forming reaction apparatus. 2. A carbamate production system comprising: a urea production apparatus for producing urea by reaction between ammonia and carbon dioxide gas, a carbamate-forming reaction apparatus for producing carbamate by carbamate-forming reaction between amine, the urea, and alcohol, and by-producing a gas containing alcohol, ammonia, and carbon dioxide, an ammonia separation apparatus for absorbing the gas with water to produce a gas absorption water, and separating ammonia, an aqueous alcohol solution separation apparatus for separating the aqueous alcohol solution from the gas absorption water, an ammonium carbonate reusing apparatus for using, in the urea production apparatus, the aqueous ammonium carbonate solution obtained by separating the aqueous alcohol solution from the gas absorption water, an ammonia reusing apparatus for using, in the urea production apparatus, the ammonia separated in the ammonia separation apparatus, and an alcohol reusing apparatus for separating alcohol from the aqueous alcohol solution and using the alcohol in the carbamate-forming reaction apparatus.
Assignees
Inventors
Classifications
- B01J12/00Primary
Chemical processes in general for reacting gaseous media with gaseous media; Apparatus specially adapted therefor (B01J3/08, B01J8/00, B01J19/08 take precedence) · CPC title
Derivatives of isocyanic acid · CPC title
Derivatives of carbamic acids, i.e. compounds containing any of the groups [IMAGE cpc-sch-C07C-0964.gif], the nitrogen atom not being part of nitro or nitroso groups · CPC title
- C07C269/04Primary
from amines with formation of carbamate groups · CPC title
- C07C263/04Primary
from or via carbamates or carbamoyl halides · CPC title
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- What does patent US9321024B2 cover?
- 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 ste…
- Who is the assignee on this patent?
- Mitsui Chemicals Inc
- What technology area does this patent fall under?
- Primary CPC classification B01J12/00. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Apr 26 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).