http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H04154763-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2f8cfa5aee4410611b5c562275c9f8e3 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D211-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D211-74 |
| filingDate | 1990-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a4dd2cc8dd3d7c450e96df933e4fd937 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_63aca86ab33bf1d18d141f8073b6fc49 |
| publicationDate | 1992-05-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H04154763-A |
| titleOfInvention | Method for purifying 2,2,6,6-tetramethyl-4-oxopiperidine |
| abstract | PURPOSE: To obtain the subject high-purity compound at a high recovery ratio and simultaneously recover the unreacted acetone and an intermediate by reacting acetone with ammonia in the presence of an acidic catalyst and treating the resultant crude reaction solution in respective steps of extraction, distillation and crystallization in combination. n CONSTITUTION: Acetone or an acidic condensate thereof is reacted with ammonia in the presence of an acidic catalyst to provide a crude reaction solution. An alkali in a molar amount of 1-3 times based on the existing catalyst and a nonpolar solvent hardly dissolving water are then added to the resultant crude reaction solution to extract and separate the product. The extract solution is subsequently distilled and fractions are dividedly distilled into the acetone, the extracting solvent/water, a reaction intermediate and the objective compound. The acetone and reaction intermediate are recycled to the reaction step and the extracting solvent is recycled to the extraction step. The aforementioned distillate is crystallized to provide crude crystals of the objective compound and the deposited crystals are then washed with an organic solvent to afford the objective high-purity 2,2,6,6-tetramethyl-4-oxopiperidine. n COPYRIGHT: (C)1992,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2706045-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-102012215903-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2706056-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-102012215900-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2002322171-A |
| priorityDate | 1990-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 26.