http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110498781-B
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-33 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-33 |
| filingDate | 2019-09-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2021-12-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2021-12-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CN-110498781-B |
| titleOfInvention | Method for synthesizing D, L-pantolactone |
| abstract | The invention relates to the technical field of chemical industry, and particularly provides a method for synthesizing D, L-pantolactone, which comprises the following steps: the method comprises the following steps: carrying out aldol condensation reaction on paraformaldehyde and isobutyraldehyde under the action of an alcohol solvent and a basic catalyst, and directly using the reaction liquid for the next step without separation; adding hydrocyanic acid, and reacting to generate 2, 4-dihydroxy-3, 3-dimethylbutyronitrile; 2, 4-dihydroxy-3, 3-dimethylbutyrate is obtained by esterification reaction of 2, 4-dihydroxy-3, 3-dimethylbutyrate under acidic condition; adding alkali to neutralize excessive acid, and carrying out solid-liquid separation to obtain a byproduct ammonium salt; the liquid distilled alcohol is recycled and rectified to obtain the D, L-pantolactone product. The method for preparing the D, L-pantolactone can obtain a target product with high content and high yield, reduces the dosage of acid and alkali, does not use an organic solvent to extract a product, greatly reduces the generation of waste water, saves energy, protects the environment and reduces the production cost. |
| priorityDate | 2019-09-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 74.