http://rdf.ncbi.nlm.nih.gov/pubchem/patent/SK-379690-A3
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_af99df08b153738cd418446a75d09bfc |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-6524 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-025 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-44 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-3817 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-6524 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-38 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-44 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-02 |
| filingDate | 1990-07-31-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_28c0c5be9d903c79f6f6cd06591b65d4 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5b7e74ef5d00960a61a4f68b3502c4ad http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3da887b3fb964371c14162925e4b13e3 |
| publicationDate | 1998-06-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | SK-379690-A3 |
| titleOfInvention | Method for purifying aminomethylene phosphonic acids |
| abstract | High purity ethylenediaminetetra(methylenephosphonic acid) and 1,4,7,10-tetraazacyclododecane1,4,7,10-tetra(methylenephosphonic acid) are prepared by dissolving the aminomethylenephosphonic acid in an aqueous base, acidifying with a mineral acid at an elevated temperature to precipitate the crystals, maintaining the solution at an elevated temperature for a period of time sufficient to assure crystallization, cooling to a lower temperature and maintaining at that temperature for a time sufficient to precipitate the crystals and filtering the resulting crystals at that temperature, washing the crystals with water and recovering the desired high purity aminophosphonic acid. The ethylenediaminetetra(methylenephosphonic acid) is obtained in a purer state during its synthesis if the crystals are filtered hot without prior cooling. |
| priorityDate | 1989-08-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 58.