GB893729A - Improvements in and relating to the preparation of aromatic isocyanates - Google Patents
Improvements in and relating to the preparation of aromatic isocyanatesInfo
- Publication number
- GB893729A GB893729A GB25793/59A GB2579359A GB893729A GB 893729 A GB893729 A GB 893729A GB 25793/59 A GB25793/59 A GB 25793/59A GB 2579359 A GB2579359 A GB 2579359A GB 893729 A GB893729 A GB 893729A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosgene
- chlorobenzene
- aromatic
- maintained
- reacting
- 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
- C07C263/10—Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C265/00—Derivatives of isocyanic acid
- C07C265/12—Derivatives of isocyanic acid having isocyanate groups bound to carbon atoms of six-membered aromatic rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C265/00—Derivatives of isocyanic acid
- C07C265/14—Derivatives of isocyanic acid containing at least two isocyanate groups bound to the same carbon skeleton
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Aromatic isocyanates are prepared by reacting phosgene with an aromatic primary amine in an inert organic solvent said reaction being initiated and maintained at a temperature within the range of 60 DEG C. to 90 DEG C. to produce an intermediate product containing carbamyl chloride, and reacting the intermediate product in the presence of phosgene at a predetermined higher temperature to produce the aromatic isocyanate. An excess of phosgene is preferably employed. The reaction may be carried out batchwise or continuously. In an example a solution of m-phenylene diamine in chlorobenzene heated to 75 DEG C. is gradually added together with excess phosgene to a saturated solution of phosgene in chlorobenzene heated to 80 DEG C., the mixture is maintained at 80 DEG C.-85 DEG C. until all the diamine is added and then refluxed, allowed to cool and the chlorobenzene distilled off to leave a residue of m-phenylene diisocyanate. The following compounds are similarly prepared in examples: 2 : 4-tolylene diisocyanate, m-chlorophenyl isocyanate and tris-(4-isocyano-phenyl)-methane.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB25793/59A GB893729A (en) | 1959-07-28 | 1959-07-28 | Improvements in and relating to the preparation of aromatic isocyanates |
| BE630754A BE630754Q (en) | 1959-07-28 | 1963-04-08 | Improvements in the preparation of aromatic isocyanates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB25793/59A GB893729A (en) | 1959-07-28 | 1959-07-28 | Improvements in and relating to the preparation of aromatic isocyanates |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB893729A true GB893729A (en) | 1962-04-11 |
Family
ID=10233400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25793/59A Expired GB893729A (en) | 1959-07-28 | 1959-07-28 | Improvements in and relating to the preparation of aromatic isocyanates |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB893729A (en) |
-
1959
- 1959-07-28 GB GB25793/59A patent/GB893729A/en not_active Expired
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