http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-583961-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5d9f3ca41550d315642580237250c5b0 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01F17-229 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C03C1-022 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01F17-229 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C03C1-02 |
| filingDate | 1944-07-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1947-01-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-583961-A |
| titleOfInvention | Purification of lanthanum compounds and the manufacture of glass therefrom |
| abstract | Solutions of lanthanum salts, e.g., acetate, bromide, bromate, chloride, or nitrate are freed from iron and cerium, by adding ammonium carbonate and hydrogen peroxide or ammonium persulphate, heating above 80 DEG C. and removing the precipitate. The reagents are preferably added in only slight excess of the quantities necessary to neutralize and oxidize the solution, and may be added together or separately to a hot or cold solution. The most efficient separation is achieved by adding persulphate to the hot previously neutralized solution. Preferably salts having less than 1 per cent. impurity are treated in 25 per cent. solution, and the precipitation is performed at the boiling point. Examples describe the purification of double ammonium lanthanum nitrate. Lanthanum oxide, recovered by evaporating the filtrate and igniting, or by precipitating and igniting lanthanum oxalate, may be used with tungsten, barium, thorium and boron oxides &c. to form colourless glasses as described in Specification 534,680, (see Group XXIII). |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2583034-A1 |
| priorityDate | 1944-07-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 47.