http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-787927-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_04650c4315071ee8af7d26e3441a53b1 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-33 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D207-267 |
| filingDate | 1955-09-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-12-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-787927-A |
| titleOfInvention | Recovery of gamma-butyrolactone |
| abstract | Gamma butyrolactone is recovered from a mixture of the lactone containing also at least one glycol ester, derived from ethylene, propylene or 2 : 3-butylene glycol and a monocarboxylic acid having 1 to 4 carbon atoms, by solvent extraction with a liquid aliphatic or cycloaliphatic hydrocarbon. Two phases result, one containing the bulk of the lactone and the other the solvent and most of the glycol esters. The hydrocarbon solvent may be used with water whereby the lactone separates out as an aqueous solution. If desired, the mixture may be extracted with the two solvents separately. Extraction may be batchwise or continuous, and co- or counter-currentwise, in one or more stages. The crude butyrolactone mixture may be that obtained as a by-product in the partial oxidation of C3-5 aliphatic hydrocarbons to lower aliphatic acids, and that form of lactone should preferably not contain more than 2 per cent of acids. In an example, a mixture of butyrolactone, acetic, propionic and butyric acids and minor amounts of glycol esters comprising mono- and di-esters of the above-mentioned glycols with C1-4 aliphatic acids and obtained by liquid phase oxidation of n-butane is fractionated to remove substantially all the acids and is then subjected to extraction with a solvent consisting of equal volumes of water and n-hexane, giving an aqueous phase, which on evaporation yields 98 per cent pure butyrolactone, and a hexane solution of the glycol esters from which the solvent is recovered for re-use. n-Pentane and n-heptane are other specified solvents. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5030328-A |
| priorityDate | 1954-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.