http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4256716-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0edbc5af7e2e56a291814f047238339e |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B25-238 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B25-238 |
| filingDate | 1979-03-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1981-03-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5b2dbf083db4a4f2c019b47883b4de69 |
| publicationDate | 1981-03-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-4256716-A |
| titleOfInvention | Process for treating loaded extractant from purification of phosphoric acid by extraction |
| abstract | In a process for purifying an aqueous phosphoric acid containing up to about 55% P2O5 by weight and dissolved magnesium, iron and aluminum ions, wherein (a) said phosphoric acid is contacted with an organic extractant containing a water immiscible organic sulfonic acid to form: an organic extractant phase containing the organic sulfonic acid, extracted ionic metallic impurities and extracted P2O5 values, and a purified aqueous phosphoric acid; and (b) the purified aqueous phosphoric acid phase is separated from the organic extractant phase; the improvement comprising (i) contacting said separated organic extractant phase with a solution phase containing calcium ions (e.g., calcium nitrate), under conditions whereby at least some of said extracted ionic metallic impurities (e.g., Mg+2, Al+3, Fe+3) are replaced by calcium and are transferred to said solutions phase; and (ii) separating said solution phase from the contacted extractant phase. The separated extractant phase can be acidified to convert at least some of the metal form of the extractant to the hydrogen or acid form. The separated solution phase from step (ii) can be neutralized to cause a solid precipitate to form, comprising at least some of the metallic impurities and/or P2O5 values from phosphoric acid which was entrained in the organic extractant. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4457848-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4713229-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4394361-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4751066-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4585636-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2013091367-A1 |
| priorityDate | 1979-03-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 91.