| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D311-72
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J27-138 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J27-138
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D311-72 |
| filingDate |
1997-12-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1999-12-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4ab863633224a3a33549b4f556def828
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5c8a76d2ecb592fe28c8d046ed6aa8bd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_be87dbeb8b46b517a86c8da0475fe711
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_71d917ef6d5ad128ed5b9652f4be747b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0ad154f8f556ac1cbe5e02f3ccffb9ca
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6288c3c81c34548ec74378613cce113d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_614b02700589c22120b01b6e89895398 |
| publicationDate |
1999-12-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-6005122-A |
| titleOfInvention |
Preparation of α-tocopherol or α-tocopheryl acetate by reacting trimethylhydroquinone and phytol or isophytol, with recycling of the zinc halide condensation catalyst |
| 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. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6441199-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6790967-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1334093-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6784303-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6518439-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-114989125-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2004182692-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-1334093-A4
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2003153772-A1 |
| priorityDate |
1996-12-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |