http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-858711-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fbf4dd6d7d974b474c77d2cc5fa709da |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C229-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C253-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C255-25 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-48 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C227-18 |
| filingDate | 1957-03-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_755da11a112e3b68392436b1a6661321 |
| publicationDate | 1961-01-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-858711-A |
| titleOfInvention | Process for producing aliphatic amino polycarboxylic acids and their alkali metal salts |
| abstract | Alkali metal salts of aliphatic (including cycloaliphatic) amino polycarboxylic acids are prepared by reacting an aliphatic amine having at least two replaceable hydrogen atoms on the same or different amino nitrogen atoms, in an alkali metal hydroxide solution with an alkali metal cyanide and a formaldehyde-yielding substance wherein an excess of cyanide and formaldehyde-yielding substance of from 25% to 67% of the theoretical amount necessary to replace each replaceable hydrogen atom is used, the cyanide being maintained in a molar excess over the formaldehyde of at least 10% (based on the total cyanide) until all the cyanide has been added, the remainder of the formaldehyde being added subsequently, and the reaction being carried out at between 190 DEG F. and 220 DEG F. until the cyanide and formaldehyde have been added, and the temperature is then slowly raised to between about 240 DEG F. and about 250 DEG F. and maintained in this range until substantially all of the ammonia fumes formed during the reaction have been expelled. By acidifying the reaction product to a pH of 0,75-2 the free acids are obtained. Specified amines are monoisopropanol ethylene diamine, monoethanol ethylene diamine, ethylene diamine, butylamine and cyclohexylamine. The products are sequestering agents. |
| priorityDate | 1957-03-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 37.