http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7091375-B2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-10 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07H7-027 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D305-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C- http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07H7-027 |
| filingDate | 2003-11-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2006-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_92cadc32094be2782a94818863990377 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7f386feb3632136463882ac8f0b9f087 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ea74ee2eed0a281d66cebc3df33dcae http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c2f53faff8932fad0968dd4f34a460a6 |
| publicationDate | 2006-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-7091375-B2 |
| titleOfInvention | Method for the production of 2=-keto-l-gulonic acid C4C10 alkyl esters |
| abstract | The invention relates to a method for producing 2-keto-L-gulonic acid-C 4 –C 10 alkyl ester by esterifying 2-keto-L-gulonic acid (KGS) with an unsaturated, branched or unbranched C 4 –C 10 alcohol. The inventive method is characterized by the fact that an aqueous KGS solution is reacted with a C 4 –C 10 alcohol up to an esterification degree of 20 to 70 percent in a pre-esterification process carried out under acidic catalysis conditions; and the obtained product is dehydrogenated with an unsaturated, branched or unbranched C 4 –C 10 alcohol in a continuous rectification device, whereby the esterification reaction continues, n-butanol preferably being used as the alkyl alcohol. In a preferred embodiment, the aqueous KGS solution is concentrated up to or beyond the limit of solubility prior to the esterification process, preferably by catalyzing a homogeneous or heterogeneous catalyst, especially sulfonic acid, at temperatures of 50 to 120° C. In another embodiment, the produced KGS ester is reacted in one or several additional steps so as to obtain L-ascorbic acid. |
| priorityDate | 2002-11-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 142.