http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102531984-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9a9014a3fdafa2825b6c8f3223bd649f http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_433272a2d449177f6af19cbcee8d1902 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1db82c6bb3381bbca94284cfd9b8fe91 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C403-08 |
| filingDate | 2011-12-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2013-12-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_39e66e40724c88c6d5a1b1035a98edee http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_43174ef171a30f3628f6ccc390fab8f4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a64df5b6499a565e8a93b17f11f2a8a1 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9de19d4e83ad63d9a5a673ccc749678c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_25e2a8f0b1a810fac1cd0c257393aaac http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4271ab4b9b80c2ef179b9cc87297a3a0 |
| publicationDate | 2013-12-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-102531984-B |
| titleOfInvention | Continuous extracting and purifying method of vitamin A intermediate |
| abstract | The invention discloses a continuous extracting and purifying method of a vitamin A intermediate. The purifying method provided by the invention is a crystallization purifying method; a crude product is dissolved in a nonpolar solvent and is refrigerated and crystallized; an impurity in the crude product has strong dissolubility for crystallization; the crystallization rate is low; the energy consumption of low-temperature crystallization is large; and a product is easy to be oxidized to go bad after the crystallization. The purifying method provided by the invention comprises the following steps of: dissolving the crude product of the vitamin A intermediate in a lower alcohol aqueous solution with a volume ratio of 20-90% to form an alcohol-water material, and subsequently, enabling the alcohol-water material to enter an extracting tower continuously, wherein the operating conditions of the extracting tower are that: the extracting temperature is 10-50 DEG C, and the volume ratio of the alcohol-water material to low-polarity extracting agent for extraction is 1: 5 to 5: 1, after 5-20 stages of countercurrent extraction, most impurities are extracted by the extracting agent, and the micro vitamin A intermediate is brought out; and obtaining the purified vitamin A intermediate after the lower alcohol aqueous solution is recovered from the alcohol-water material obtained at the bottom of the extracting tower. The purity of the product obtained by the continuous extracting and purifying method is high, and a subsequent hydrogenation reaction is beneficial. |
| priorityDate | 2011-12-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 54.