http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-865420-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_dc2f7134efa50484bb359fda73782848 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C41-26 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G65-30 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-28 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C43-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C31-18 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C43-11 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G65-30 |
| filingDate | 1957-07-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1961-04-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-865420-A |
| titleOfInvention | Process for obtaining pure polyalkylene derivatives |
| abstract | One or more esters of poly alkylene glycol mono alkyl esters with alkanoic acids containing not more than five carbon atomes and subsequently, if desired, the corresponding poly alkylene glycol mono alkyl ethers, are obtained as individual compounds from a mixture of poly alkylene glycol mono-alkyl ethers of an average molecular weight not exceeding 600, the alkyl groups being the same in all compounds of the mixture, by converting the mixture into a mixture of their esters with a single alkanoic acid having not more than five carbon atoms by reaction with the acid or a functional derivative thereof, subjecting the resulting mixture of esters to fractional distillation and collecting one or more fractions, each fraction consisting of a single ester and, if desired, deacylating the isolated ester. The invention comprises also as single new compounds the acetates of the mono-methyl ethers of octa-, nona- and deca-ethylene glycols. After deacylation, effected for example by hydrolysis with an alkali metal or alkaline earth metal compound of alkaline reaction, the liberated poly glycol mono ether may be recovered from the hydrolysis solution by salting out or concentrating down, followed by extraction with a solvent. In Examples: (1) a mixture of the monomethyl ethers of octa-, nono- and deca-ethylene glycols is esterified with acetic anhydride in the presence of pyridine, the resulting ester mixture is stripped of acetic acid and excess acetic anhydride and fractionally distilled under high vacuum in a double-tube column; separate fractions of the individual pure ether-esters are collected and separately saponified and the ether alcohol recovered; (2) a poly ethylene glycol mono methyl ether (mean M.W. 350) is esterified with acetic anhydride and fractionated as in (1) and a pure nona-ethylene glycol mono-methyl ether acetate recovered and deacylated; (3)-(4) a commercial triethylene glycol mono methyl ether is esterified as above, fractionated under reduced pressure and a pure fraction of triethylene glycol mono methyl ether acetate is collected and saponified; (5) a commercial poly ethylene glycol mono-methyl ether (mean M.W. 425) is esterified as in (2) and fractionated in the column of (1) to obtain an almost pure nona-ethylene glycol monomethyl ether acetate fraction which is then redistilled to obtain the pure ester which is thereafter hydrolysed as above. |
| priorityDate | 1956-07-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 39.