http://rdf.ncbi.nlm.nih.gov/pubchem/patent/RU-2741870-C1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_b3f2510cb419d90b66eabe157e30a659 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D301-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D301-12 |
| filingDate | 2020-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-01-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c9a4fdc2c7b7395aa702fe45df143e64 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_95db2673e85cc68aa995d8e62df9d707 |
| publicationDate | 2021-01-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | RU-2741870-C1 |
| titleOfInvention | Method of producing crystalline form of cis-2,3-epoxy succinate calcium |
| abstract | FIELD: chemistry.SUBSTANCE: invention relates to production of metal carboxylates. In particular, the invention relates to production of a new crystalline form of cis-2,3-epoxy succinate calcium (salts of 2,3-epoxy-1,4-butanedioic acid) and is a raw material for obtaining L - (+) - tartaric acid. Method of producing the crystalline modification of cis-2,3-epoxy succinate calcium involves the following steps: a) partial neutralization of maleic acid or maleic anhydride with a first portion of a calcium compound to obtain acidic calcium maleate; b) epoxidation of acidic calcium maleate with hydrogen peroxide in the presence of epoxidation catalysts to obtain acid cis-2,3-epoxy succinate calcium; c) neutralizing the acid cis-2,3-epoxy succinate calcium by adding a second portion of the calcium compound; d) holding cis-2,3-epoxy succinate calcium for 24 to 240 hours to obtain a crystalline form of cis-2,3-epoxy succinate calcium, where the crystals belong to the space group P21/n, wherein the crystal lattice parameters at 22 °C area= 15.1916 (2) Å, b = 8.9121 (1) Å, c = 7.4724 (1) Å, beta = 103.309 (1)°, where step (b) epoxidation is carried out at a pH value not higher than 3.EFFECT: technical result is obtaining a crystalline form of cis-2,3-epoxy succinate calcium with content of D-tartaric acid (by-product) of 1.2 % and less, with pH of epoxidation stage not higher than 3.75 cl, 4 tbl, 5 dwg |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2021194384-A1 |
| priorityDate | 2020-03-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 70.