GB1459691A - Isocyanates - Google Patents
IsocyanatesInfo
- Publication number
- GB1459691A GB1459691A GB1545574A GB1545574A GB1459691A GB 1459691 A GB1459691 A GB 1459691A GB 1545574 A GB1545574 A GB 1545574A GB 1545574 A GB1545574 A GB 1545574A GB 1459691 A GB1459691 A GB 1459691A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphuric acid
- ester
- esters
- isocyanates
- isocyanate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C263/00—Preparation of derivatives of isocyanic acid
- C07C263/18—Separation; Purification; Stabilisation; Use of additives
- C07C263/20—Separation; Purification
Abstract
1459691 Isocyanate purification IMPERIAL CHEMICAL INDUSTRIES Ltd 10 March 1975 [8 April 1974] 15455/74 Heading C2C The hydrolysable chlorine content of organic isocyanates is reduced by heating them with sulphuric acid or an ester thereof. The isocyanate may be distilled or part distilled after the above treatment. Specified isocyanates are phenylisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and methylene bridged polyphenyl polyisocyanates. The sulphuric acid or ester thereof is preferably used in an amount of up to three molar proportions for each atomic proportion of hydrolysable chlorine. The esters of sulphuric acid may be full esters, half esters or ester salts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1545574A GB1459691A (en) | 1974-04-08 | 1974-04-08 | Isocyanates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1545574A GB1459691A (en) | 1974-04-08 | 1974-04-08 | Isocyanates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1459691A true GB1459691A (en) | 1976-12-22 |
Family
ID=10059444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1545574A Expired GB1459691A (en) | 1974-04-08 | 1974-04-08 | Isocyanates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1459691A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222066B1 (en) | 1999-03-30 | 2001-04-24 | Bayer Aktiengesellschaft | Process for decreasing the chlorine content of organic isocyanates |
| US6391161B1 (en) | 1999-03-30 | 2002-05-21 | Bayer Aktiengesellschaft | Method for reducing the chlorine content of low molecular weight isocyanates |
| US6395925B1 (en) | 1999-05-17 | 2002-05-28 | Bayer Aktiengesellschaft | Process for purifying organic isocyanates, the organic isocyanates so purified and their use |
| WO2016120167A1 (en) | 2015-01-30 | 2016-08-04 | Basf Se | Low-by-product polyphenylene polymethylene polyisocyanates |
| CN110396057A (en) * | 2019-07-16 | 2019-11-01 | 万华化学（宁波）有限公司 | A method of preparing the isocyanates of low chlorine content |
-
1974
- 1974-04-08 GB GB1545574A patent/GB1459691A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6222066B1 (en) | 1999-03-30 | 2001-04-24 | Bayer Aktiengesellschaft | Process for decreasing the chlorine content of organic isocyanates |
| US6391161B1 (en) | 1999-03-30 | 2002-05-21 | Bayer Aktiengesellschaft | Method for reducing the chlorine content of low molecular weight isocyanates |
| US6395925B1 (en) | 1999-05-17 | 2002-05-28 | Bayer Aktiengesellschaft | Process for purifying organic isocyanates, the organic isocyanates so purified and their use |
| WO2016120167A1 (en) | 2015-01-30 | 2016-08-04 | Basf Se | Low-by-product polyphenylene polymethylene polyisocyanates |
| US10501406B2 (en) | 2015-01-30 | 2019-12-10 | Basf Se | Low by-product content polyphenylene polymethylene polyisocyanates |
| CN110396057A (en) * | 2019-07-16 | 2019-11-01 | 万华化学（宁波）有限公司 | A method of preparing the isocyanates of low chlorine content |
| CN110396057B (en) * | 2019-07-16 | 2022-02-18 | 万华化学集团股份有限公司 | Method for preparing isocyanate with low chlorine content |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |