http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-100374430-C
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6ca1ebf184089db10deb8452d53e22b5 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J27-138 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-72 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J27-138 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-72 |
| filingDate | 1997-12-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2008-03-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2008-03-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-100374430-C |
| titleOfInvention | Process for preparing Alpha-tocopherol or Alpha-tocopheryl acetate |
| abstract | A process for preparing alpha -tocopherol or alpha -tocopheryl acetate by reacting 2,3,5-trimethylhydroquinone with isophytol or phytol in the presence of a zinc halide condensation catalyst and a proton donor in a solvent with or without subsequent esterification with acetic anhydride, which comprises A. carrying out the reaction in a nonpolar solvent which is only slightly water-miscible, if at all and B. introducing the required zinc halide into the reaction in the form of a mixture of from 1 to 4 mol of water per mol of zinc halide. The possibility of introducing the zinc halide required in the process according to the invention in the form of a mixture of zinc halide and water which can be readily handled and metered at from 50 to 200 DEG C. without impairing the yield and purity of the tocopherol opens the way to an advantageous recycling of the zinc halide after the reaction by separating off or extracting and recycling the zinc halide in the form of a from 60 to 90% strength by weight solution or pumpable magma. |
| priorityDate | 1996-12-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 69.