http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-863137-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e95dc47b91eed2e59a22adbc58b3c6e2 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C2-867 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C2-86 |
| filingDate | 1958-04-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6fe5b0376eb0dff68dee49217516a663 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cb2f299f540fe673b31c23dbfc434e8e |
| publicationDate | 1961-03-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-863137-A |
| titleOfInvention | Production of conjugated diolefins |
| abstract | Isoprene is produced by catalytically condensing formaldehyde with isobutene in a vapour phase mixture of isobutene and butene-1, which latter remains unreacted, distilling the product to obtain unreacted isobutene and butene-1, overhead and a bottoms fraction containing isoprene which is recovered. The starting material may be a C4 cracked petroleum fraction preferably containing at least 20% isobutene, not more than 10-15% butenes; less than 5% of butadiene and containing butene-2 in addition to butene-1. Recycle of unreacted material is controlled to prevent build-up of butene-1. The process may be combined with an isomerisation process which converts butene1 to butene-2, the initial material either being introduced into the condensation reactor, usually when butene-2 is absent, or the isomerisation reactor if butane-2 is present. In the former case all or part of the overhead from the distillation following the condensation reactor is isomerised and the effluent distilled to separate butene-2, the overhead being recycled to the condensation. In the latter case the whole overhead from the distillation following the condensation may be recycled to the isomerisation or part may be recycled to the condensation direct or to the distillation following the isomerisation. The isomerisation may be effected as described in U.S.A. Specifications 2,403,672 and 2,428,516, preferably at below 200 DEG C. e.g. using mineral acids which may be supported on alumina, kieselguhr, bauxite or porcelain chips or over silica-alumina, surface-active earths, magnesium oxide, activated brucite, activated magnesite, reduced nickel or cobalt, black chromium oxide or tungsten/nickel sulphide. The condensation may be effected as described in Specifications 826,545, 826,546, 841,746, 841,747, 841,748, 863,136 and 863,138. Specification 839,309 also is referred |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3253051-A |
| priorityDate | 1958-04-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 44.