http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-886714-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1e70c0aeade92d7571d955d3b90ea06e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C17-269 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C17-386 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C17-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C17-386 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C17-269 |
| filingDate | 1959-08-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1962-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-886714-A |
| titleOfInvention | Production of fluorocarbons |
| abstract | <PICT:0886714/IV (b)/1> Hexafluoropropylene and perfluoro-cyclobutane are separated from a mixture of fluorocarbons obtained by the pyrolysis of chlorodifluoromethane at 400 DEG C. to 900 DEG C. followed by the removal of tetrafluoroethylene, hydrogen chloride and unreacted chlorodifluoro-methane from the mixture, by extractive distillation under liquid distillation conditions by aromatic or chlorinated aromatic hydrocarbons. The pyrolysis may be carried out from 0.05 to 5 seconds at a pressure between 0.1 to 2.0 atmospheres and the hydrocarbon may be alkyl or chlorosubstituted benzene such as xylene, toluene, chlorobenzene o- or p-chlorotoluene, or o-chloroethyl benzene preferably employed in from 1 to 25 times the amount of fluorocarbons produced in the pyrolysis. In an embodiment of the process, gases from the pyrolysis of chlorodifluoromethane in a multiple tube furnace (10), are cooled (11) and compressed (12) and tetrafluoroethylene and hydrogen chloride are distilled off (13), chlorodifluoromethane removed (15), and the compounds boiling higher than chlorohexafluoropropane removed (17), the mixture is then passed to an extractive distillation column (18) into which solvent is charged. The overhead fraction comprising pure hexafluoropropylene and perfluorocyclobutane is then separated in a further distillation column (19) and the solvent dried and recycled. Specified examples are given and the process may be employed for the preparation of hexafluoropropylene and perfluorocyclobutane. U.S.A. Specification 2,551,573 is referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5049241-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-9944973-A1 |
| priorityDate | 1958-08-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 41.