http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-753741-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b30d807376962224a66aa244d678104a |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C211-50 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-78 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C265-14 |
| filingDate | 1954-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1956-08-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-753741-A |
| titleOfInvention | Process for the production of organic isocyanates |
| abstract | Organic isocyanates are prepared by the reaction between a carbonyl halide and a primary organic monoamine or polyamine and/or carbamyl halide in the presence of boron trifluoride or a complex thereof yielding boron trifluoride under the reaction conditions without generating a compound with which the isocyanate reacts. The process is applicable to the preparation of alkyl-, cycloalkyl-, aralkyl-, aryl-, alkaryl- and hydroaryl mono- and polyisocyanates. From 0.5 to 3 per cent of boron trifluoride is preferably employed, based upon the weight of the primary amine, and this may be added in the form of a complex with diethyl ether, acetone, pyridine, dimethylaniline, ethyl acetate or anisole. The reaction is preferably conducted at 70-120 DEG C. in an inert organic liquid, preferably one boiling below 200 DEG C at atmospheric pressure, e.g. benzene, toluene, xylene, cymene, cyclohexane, monochloro-, dichloro- and amyl-benzene, carbon tetrachloride, tetrachloroethane, trichloro- and tetrachloroethylene. The primary amine hydrohalide and/or carbamyl halide is preferably produced in situ by treating a solution or slurry of the corresponding primary amine in an organic liquid with phosgene, carbonyl bromide or a halogen halide. After subsequent conversion to isocyanate the reaction mixture may be degassed and/or fractionally distilled. The examples describe the preparation of p:p1-diisocyanatodiphenylmethane. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2374105-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2344350-A1 |
| priorityDate | 1953-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 59.