http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-101689366-B1
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C319-20 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C319-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D207-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C323-58 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C319-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C323-58 |
| filingDate | 2013-01-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2016-12-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2016-12-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-101689366-B1 |
| titleOfInvention | Clean method for preparing d,l-methionine |
| abstract | The present invention relates to a method for producing clean D, L-methionine, which comprises preparing a potassium cyanide by absorbing hydrocyanic acid using an aqueous solution of a crystal mother liquor containing potassium carbonate as an absorption liquid, Potassium cyanide was reacted with 3-methylthio propionaldehyde and ammonium bicarbonate at 50 to 150 ° C for 3 to 15 minutes to obtain 5- (β-methylthioethyl) hydantoin (5-methylthioethyl) hydantoin - (β-methylthioethyl) hydantoin) solution, and then the temperature of the 5- (β-methylthioethyl) hydantoin solution is increased to 140 to 220 ° C. to conduct a saponification reaction for 2 to 15 minutes. After the temperature was lowered to 0 to 40 ° C, extraction was carried out using an organic solvent, and the water phase was neutralized with CO 2 and crystallized, followed by filtration, washing and drying to obtain D, L-methionine product do. The temperature of the D, L-methionine crystal mother liquor produced by filtration is raised to 110 to 160 ° C to remove CO 2, and then used as a hydrocyanic acid absorption liquid in all circulation processes. The process of the present invention is a continuous production process and basically a clean production process in which waste water and waste gas are not generated. |
| priorityDate | 2012-09-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 128.