| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2f2ed19fccd5a1a9ea5e6d7846459e43 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-09
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C69-704 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-704
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C59-265
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-09
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-00 |
| filingDate |
1974-12-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1976-04-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a9b89f769b2fa478713ccdd306c9773e |
| publicationDate |
1976-04-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3950397-A |
| titleOfInvention |
Process for the preparation of citric acid esters, citric acid or citric acid salts |
| abstract |
A process is provided for making a triester of citric acid wherein the cyanohydrin of an acetone dicarboxylic acid diester is reacted with 1 to 3 molar equivalents of an aliphatic alcohol having 1 to 4 carbon atoms and at least two molar equivalents of anhydrous hydrogen chloride in an inert halogenated organic solvent for the cyanohydrin diester at not above 50°C. to form an imino ether, removing excess hydrogen chloride, adding water to form a two-phase system, separating the organic and water phases and recovering the resulting triester from the organic phase. The triester may be hydrolyzed into citric acid or a salt of citric acid in an acid or alkaline medium. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6403825-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2010101477-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007061084-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4501916-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5338470-A |
| priorityDate |
1973-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |