http://rdf.ncbi.nlm.nih.gov/pubchem/patent/RU-2756956-C2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_419f52dc07e3a8101a47a2ac44cb460e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F20-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D303-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D301-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-367 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D301-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F20-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-367 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D303-48 |
| filingDate | 2020-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-10-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bf69c96e3e198a33cb12c39d125736a1 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9def31a5836585936b8772cfb00995e9 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5abb458652e4b80a764cffa5b2ab1686 |
| publicationDate | 2021-10-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | RU-2756956-C2 |
| titleOfInvention | Method for obtaining crystalline form of calcium cis-2,3-epoxysuccinate |
| abstract | FIELD: chemistry.SUBSTANCE: invention relates to a method for obtaining a crystalline form of calcium cis-2,3-epoxysuccinate, where crystals belong to a spatial group P21/n, and parameters of a crystal lattice at 22°C are a=15.1916(2) Å, b=8.9121(1) Å, c=7.4724(1) Å, beta=103.309(1)°, including following stages: a) obtaining acid calcium maleate by incomplete neutralization of maleic acid with the first portion of a calcium compound, wherein the calcium compound is fed as a suspension in water; b) epoxidation of acid calcium maleate with hydrogen peroxide in the presence of an epoxidation catalyst to obtain acid calcium cis-2,3-epoxysuccinate; c) neutralization of acid calcium cis-2,3-epoxysuccinate by adding the second portion of the calcium compound, where the calcium compound is fed as a suspension in water; d) aging of calcium cis-2,3-epoxysuccinate for 24 to 240 h to obtain crystalline calcium cis-2,3-epoxysuccinate. The invention also relates to a method for obtaining a crystalline form of calcium cis-2,3-epoxysuccinate, indicated above, including an additional stage of adding a seed.EFFECT: aim of the invention is that a new method is developed for producing a crystalline form of calcium cis-2,3-epoxysuccinate, which can be raw material for producing high-purity L-(+)-tartaric acid and polycarboxylate.56 cl, 5 dwg, 4 tbl, 7 ex |
| priorityDate | 2020-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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