http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-103242197-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e9d017180c04dc76ee1b54bdbea52993 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C255-41 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C253-30 |
| filingDate | 2013-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2014-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e275e45e8d577402f9a49dfe3ab793bf http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f733cf877020ffe853f7b64b1ebd13db http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2e074f8d2b5cfbe86b33661fb38b955f |
| publicationDate | 2014-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-103242197-B |
| titleOfInvention | Preparation method of ultraviolet absorbent intermediate etocrilene (ETO) |
| abstract | The invention relates to a preparation method of an ultraviolet absorbent intermediate etocrilene (ETO). The preparation method comprises the following steps of: 1, adding benzophenone, ethyl cyanoacetate, a catalyst and a water-insoluble solvent into a condensation reaction kettle, carrying out backflow water distribution reaction for 12-15h, and then, cooling to 50-55 DEG C, wherein the excessive equivalent of the ethyl cyanoacetate relative to the benzophenone is 0.2-5; 2, washing the reaction liquid by using water, and separating the liquid to respectively obtain a water layer and an organic layer; distilling the recycled water at the water layer at normal pressure, dissolving distillation tailings by using a solvent same as the solvent used in the step 1, and then, replenishing a proper quantity of catalyst to obtain a product, wherein the distilled recycled water is used in the step 2, and the product is used in the step 1; and distilling the recycled solvent at the organic layer at normal pressure, and carrying out reduced pressure distillation to recycle the excessive ethyl cyanoacetate, wherein the recycled solvent and ethyl cyanoacetate are used in the step 1; 3, carrying out reduced pressure distillation on the distillation tailings, adding 75-100% of ethanol for crystallizing, and filtering to obtain the etocrilene; and 4, filtering a mother solution obtained in the step 3, recycling the ethanol at normal pressure, and carrying out reduced pressure recycle on the benzophenone and the etocrilene, wherein the recycled ethanol is used in the step 3, and the recycled benzophenone and etocrilene are used in the step 1. The preparation method has the advantages of simplicity in operation, short production period, little environment pollution, low energy consumption, realization of material recycling, and the like. |
| priorityDate | 2013-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 73.