http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-920525-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ca44b25e7e4596c7229d8578af6a3bda |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C25C3-36 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C25C3-36 |
| filingDate | 1960-11-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1436b2da7d3734dcce6ef7c2072cdc5c http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_15a7238afa7dc398b98fb38c2ae5d9c7 |
| publicationDate | 1963-03-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-920525-A |
| titleOfInvention | Alkali metal production |
| abstract | 920,525. Sodium-potassium alloys; sodiumpotassium - lead alloys; lead tetra-alkyls. ASSOCIATED OCTEL CO. Ltd. Nov. 1, 1961 [Nov. 11, 1960], No. 38844/60. Class 41. Sodium-potassium alloy is produced by electrolysis of a molten mixture comprising 45 to 65% by weight of barium chloride, 15 to 40% by wt. of potassium chloride and 10-30% by wt. of sodium chloride (preferably 50-52%, 24-27% and 22-25% respectively) and conducted at about 600‹ C. in a Downs cell of conventional construction. The alloy so produced is then alloyed with lead to prepare a sodiumpotassium-lead alloy containing equiatomic amounts of alkali metal and lead, i.e. 1 gramatom of lead to 1 gram-atom of alkali metal, by slowly stirring sodium-potassium alloy into molten lead at 400-450 C. The sodium-potassium-lead alloy in flake form is charged into an alkylation reaction autoclave together with an alkyl chloride for conversion under pressure to lead tetra-alkyl. The autoclave is operated at 70-80 p.s.i. for 1¢ to 2 hours after which the tetra-alkyl lead is recovered from the reaction mass by steam distillation. The use of ethyl chloride as the alkyl chloride produces tetra-ethyl lead and methyl chloride produces tetra-methyl lead. The sodium-potassium alloy from the Downs cell using the preferred electrolyte contains 2.3 to 2.6% by weight of potassium, and the potassium content depends on the precise constitution of the electrolyte which can generally be adjusted within narrow limits to form an alloy having the exact proportions of sodium and potassium desired. Higher potassium contents can be obtained but the efficiency of the process decreases as the amount of potassium increases. The preferred electrolyte begins to freeze at 560-565‹ C. and has a density of 2.25 gms. per c.c. at 600‹ C. and an average current efficiency of 72% is mentioned during operation of the cell. |
| priorityDate | 1960-11-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 32.