http://rdf.ncbi.nlm.nih.gov/pubchem/patent/SE-314082-B
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1a31b1d11644815509b69b25d747d0bf |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F1-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F1-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F1-04 |
| filingDate | 1962-10-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5e161505c14cbdc800f689055a81d1f2 |
| publicationDate | 1969-09-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | SE-314082-B |
| abstract | Crystalline trialkali metal nitrilotriacetates are covered from a saponification solution, obtained by treating nitriloacetonitrile with alkali metal hydroxide at 90-100 DEG C. and containing about 40% by weight of the triacetate, by mixing said saponification solution with a 50% by weight aqueous solution of the same alkali metal hydroxide at 60-100 DEG C., allowing the mixture to cool to 60 DEG C. or below, and separating the trialkali metal nitriloacetate crystals which form. The process can be effected in a continuous manner by adding fresh nitriloacetonitrile to the mother liquor from the crystals and saponifying this mixture by heating to 90-100 DEG C., sufficient alkali metal hydroxide solution having been added at the crystallization stage to saponify all the added nitrilotriacetonitrile; this saponification mixture is then used as the starting material for the crystallization procedure. The continuous mode of operation is illustrated with reference to diagrammatic drawings (not shown). It is preferred to mix the alkali metal hydroxide solution and the saponification mixture in stages and, in the continuous process, the wash the crystals with part of the saponification mixture. The examples relate to trisodium nitrilotriacetate. |
| priorityDate | 1961-10-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 23.