Method for producing xylylene diisocyanate and system for producing xylylene diisocyanate
US-9512067-B2 · Dec 6, 2016 · US
Method for producing carbamate, method for producing isocyanate, carbamate production system, and isocyanate production system
US8940926B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8940926-B2 |
| Application number | US-201113701980-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 19, 2011 |
| Priority date | Jun 16, 2010 |
| Publication date | Jan 27, 2015 |
| Grant date | Jan 27, 2015 |
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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).
The invention claimed is: 1. A method for producing carbamate, the method comprising the steps of: a urea production step of producing urea by reaction between ammonia and carbon dioxide gas, a carbamate-forming step of 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 step of absorbing the gas with water to produce a gas absorption water, and sep…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C07C263/04Primary
Chemistry & Metallurgy · mapped topic
- C07C269/04Primary
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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Frequently asked questions
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- What does patent US8940926B2 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?
- Takamatsu Koji, Kato Satoshi, Fukuda Takeshi, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification C07C263/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 27 2015 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).