http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-813867-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2fa8f8941ecc2d9521285617dbb93322 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C10M2207-282 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C10M2207-34 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C10M3-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-60 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-76 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-80 |
| filingDate | 1956-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a4fe1cf1647c0839148fa8421c033b55 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2c7fee67312f881a9bc9044f1243affa |
| publicationDate | 1959-05-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-813867-A |
| titleOfInvention | Purification of esters of dicarboxylic acids |
| abstract | Alkyl and oxa-alkyl diesters of dicarboxylic acids are purified by a process comprising treating the ester with ozone and thereafter with a reducing agent so as to decolorize or improve the odour stability of the ester. The ozone treatment may be effected with ozonized air at about 10-100 DEG C. The treatment with a reducing agent may be effected by washing the ester with an aqueous solution of a reducing agent such as an alkali metal sulphite or bisulphite, sulphur dioxide, sodium nitrite, hydrazine or, according to the Provisional Specification, ferrous sulphate, suitably at about 20-100 DEG C. using a concentration of reducing agent of about 1-20 per cent by weight. Alternatively, the ester may be treated with hydrogen in the presence of a hydrogenation catalyst. In between the treatments with ozone and the reducing agent, the ester is preferably washed with an aqueous solution of an alkali as described in Specification 783,463. The process may be combined with other purifications. Thus, the ester may be washed with aqueous alkali prior to the ozone treatment and, if desired, steamed and after the ozone treatment it may be treated with activated carbon and then, if desired, again treated with ozone. Following the treatment with the reducing agent, the ester is preferably washed with water and then dried. Esters which may be purified include the di-esters of saturated aliphatic alcohols such as the butanols, octanols, nonanols, decanols and alcohols containing etherlinkages, for example butoxy-ethanol, with dicarboxylic acids such as phthalic, pimelic, sebacic, oxalic and tartaric acids and mixed esters of these acids such as butyl octyl phthalate. Examples are given describing the purification of a mixture of di-esters obtained from phthalic anhydride and C7-9 primary alcohols and di-2-ethylhexyl phthalate respectively using aqueous sodium sulphite or bisulphite, aqueous hydrazine or hydrogen and Raney nickel as reducing agent. In some cases, the products are finally steamed, washed with water or washed with aqueous alkali and the esters are then compared with the corresponding esters treated similarly but with omission of the reducing treatment and having, in consequence, a higher peroxide impurity content. Di-butoxyethyl phthalate is another specified ester. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9944582-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2308821-A2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-102009048774-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8524938-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9718758-B2 |
| priorityDate | 1956-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 68.