GB1112450A - Purification of organic isocyanates - Google Patents
Purification of organic isocyanatesInfo
- Publication number
- GB1112450A GB1112450A GB4793865A GB4793865A GB1112450A GB 1112450 A GB1112450 A GB 1112450A GB 4793865 A GB4793865 A GB 4793865A GB 4793865 A GB4793865 A GB 4793865A GB 1112450 A GB1112450 A GB 1112450A
- Authority
- GB
- United Kingdom
- Prior art keywords
- distillation step
- remove
- distilling
- residue
- inert gas
- 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
- 239000012948 isocyanate Substances 0.000 title abstract 4
- 150000002513 isocyanates Chemical class 0.000 title abstract 4
- 238000000746 purification Methods 0.000 title 1
- 238000004821 distillation Methods 0.000 abstract 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 2
- 239000011261 inert gas Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 abstract 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 abstract 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound 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
In a process for purifying a crude organic isocyanate comprising passing an inert gas through said isocyanate to remove hydrogen chloride and phosgene, distilling, in a first distillation step, the resulting degassed material to remove solvent contained therein and distilling in a second distillation step, the residue of the first distillation step to remove the organic isocyanate from residual impurities, the residue of the first distillation step is heated to a temperature in the range 150 DEG to 300 DEG C. prior to said second distillation step, whereby the concentration of the hydrolysable chloride is substantially reduced. The process may be carried out batchwise or continuosly. In examples, toluene diisocyanate is purified and nitrogen is employed as inert gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4793865A GB1112450A (en) | 1965-11-11 | 1965-11-11 | Purification of organic isocyanates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4793865A GB1112450A (en) | 1965-11-11 | 1965-11-11 | Purification of organic isocyanates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1112450A true GB1112450A (en) | 1968-05-08 |
Family
ID=10446790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4793865A Expired GB1112450A (en) | 1965-11-11 | 1965-11-11 | Purification of organic isocyanates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1112450A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0497538A3 (en) * | 1991-01-28 | 1993-01-13 | The Dow Chemical Company | Process for reducing hydrolyzable chloride in toluene diisocyanate |
| 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 |
| CN116836088A (en) * | 2023-06-16 | 2023-10-03 | 宁夏瑞泰科技股份有限公司 | Purification method of n-butyl isocyanate |
| CN117658863A (en) * | 2023-12-07 | 2024-03-08 | 万华化学集团股份有限公司 | A method for preparing isocyanate monomer by phosgenation method |
| CN118164875A (en) * | 2022-12-08 | 2024-06-11 | 万华化学集团股份有限公司 | Phosgenation method for preparing pentamethylene diisocyanate |
-
1965
- 1965-11-11 GB GB4793865A patent/GB1112450A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0497538A3 (en) * | 1991-01-28 | 1993-01-13 | The Dow Chemical Company | Process for reducing hydrolyzable chloride in toluene diisocyanate |
| 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 |
| CN118164875A (en) * | 2022-12-08 | 2024-06-11 | 万华化学集团股份有限公司 | Phosgenation method for preparing pentamethylene diisocyanate |
| CN116836088A (en) * | 2023-06-16 | 2023-10-03 | 宁夏瑞泰科技股份有限公司 | Purification method of n-butyl isocyanate |
| CN116836088B (en) * | 2023-06-16 | 2025-10-17 | 宁夏瑞泰科技股份有限公司 | Purification method of n-butyl isocyanate |
| CN117658863A (en) * | 2023-12-07 | 2024-03-08 | 万华化学集团股份有限公司 | A method for preparing isocyanate monomer by phosgenation method |
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