GB1111581A - Process for the purification of organic diisocyanates - Google Patents
Process for the purification of organic diisocyanatesInfo
- Publication number
- GB1111581A GB1111581A GB560365A GB560365A GB1111581A GB 1111581 A GB1111581 A GB 1111581A GB 560365 A GB560365 A GB 560365A GB 560365 A GB560365 A GB 560365A GB 1111581 A GB1111581 A GB 1111581A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diisocyanate
- purification
- calcium hydroxide
- organic diisocyanates
- organic
- 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
- 125000005442 diisocyanate group Chemical group 0.000 title abstract 5
- 238000000034 method Methods 0.000 title 1
- 238000000746 purification Methods 0.000 title 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 2
- 239000000920 calcium hydroxide Substances 0.000 abstract 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 abstract 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 150000004985 diamines Chemical class 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000003701 inert diluent Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical group CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 abstract 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The hydrolysable chlorine content of an undistilled organic diisocyanate, obtained by phosgenation of a diamine, is reduced by contacting the diisocyanate with calcium hydroxide under conditions no more strenuous than those of heating at 140 DEG C. for 5 1/2 hours and then removing the solid inorganic matter from the diisocyanate. The treatment with the calcium hydroxide, which is generally employed in a stoichiometric excess, may be effected in an inert diluent. A specified diisocyanate is tolylene diisocyanate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB560365A GB1111581A (en) | 1965-02-09 | 1965-02-09 | Process for the purification of organic diisocyanates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB560365A GB1111581A (en) | 1965-02-09 | 1965-02-09 | Process for the purification of organic diisocyanates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1111581A true GB1111581A (en) | 1968-05-01 |
Family
ID=9799198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB560365A Expired GB1111581A (en) | 1965-02-09 | 1965-02-09 | Process for the purification of organic diisocyanates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1111581A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116535334A (en) * | 2023-05-22 | 2023-08-04 | 南京工业大学 | A method for reducing hydrolyzed chlorine content in isocyanate |
-
1965
- 1965-02-09 GB GB560365A patent/GB1111581A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116535334A (en) * | 2023-05-22 | 2023-08-04 | 南京工业大学 | A method for reducing hydrolyzed chlorine content in isocyanate |
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