http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-634587-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f089a95d322d73fb63b254f5ef8efe79 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d3bbabb4b6799b9c0a0507f64b1aa303 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_74ba95224e97adc42c2c21d4142d9008 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2fa8f8941ecc2d9521285617dbb93322 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-582 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C1-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C1-30 |
| filingDate | 1947-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1950-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-634587-A |
| titleOfInvention | Manufacture of styrene compounds |
| abstract | Styrenes, the benzene ring of which may be substituted for example by alkyl groups or chlorine, are prepared by heating the corresponding chloroethylbenzenes in the liquid phase with more than 0.2 per cent by weight of collidine at a temperature between the lowest at which dehydrochlorination occurs and the boiling-point of the chloroethyl compound. Specified starting-materials are chloroethyl xylenes, chloroethyl cymene, and chloroethyl mono- or dichlorobenzene. It is preferred to use between 0.5 and 10 per cent of collidine, which may be added in the form of the collidinium ion as in a salt with an acid such as hydrochloric, phosphoric or acetic. A batch process may be used but continuous operation is preferred. If the reaction mixture is heterogeneous, agitation is necessary, for example by blowing an inert gas such as nitrogen through or by refluxing; hydrochloric acid gas is removed simultaneously in these processes. An inert solvent may be used, e.g. toluene, xylene, ethyl benzene, and is chosen to give the required reflux temperature. The reactants may be refluxed under reduced pressure, with or without a solvent. The collidine may be pure or a crude mixture of alkylpyridines. The styrene is preferably distilled off through a column as formed. It is preferred to carry out the reaction in an inert atmosphere. A polymerization inhibitor, e.g. hydroquinone or pyrogallol may be present. In the examples: (1) a -chloroethylmonochlorobenzene is heated at 170-180 DEG C. at 200 mm. pressure with collidine hydrochloride to give chlorostyrene; (2) and (3) vinyl xylene is prepared by refluxing chloroethyl xylene with collidine in toluene or xylene. Specifications 356,107, 387,397, 396,079 and 520,602 are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2646792-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5254720-A |
| priorityDate | 1947-06-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 45.