http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-861571-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f1ec478eabf69a930be208ed6ba116ec |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N31-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N31-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N31-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C327-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N31-22 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N31-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N31-02 |
| filingDate | 1956-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1961-02-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-861571-A |
| titleOfInvention | A new derivative of toluene-3:4-dithiol and methods of preparation and use thereof |
| abstract | The invention comprises S-diacetyltoluene-3,4-dithiol which is made by treating dithiol in caustic soda with acetic anhydride at 0 DEG C. in an inert gas atmosphere. From the above diacetate dithiol may readily be liberated and used to detect and estimate metals either with or without the addition of hydrogen sulphide. A solid mixture useful for the above purpose comprises thioacetamide, or other source of hydrogen sulphide and 0.1-25%, preferably 0.5-5%, of diacetyldithiol.ALSO:The invention comprises S-diacetyltoluene-3,4-dithiol, from which dithiol may readily be liberated, for use in the detection, estimation, separation and purification of metals and their compounds. In aqueous solution dithiol, and in some instances its S-mono- or di-acetates, form highly coloured complexes with thiophilic metals. Liberation is effected by treatment with alcoholic potash and standard solutions for volumetric analysis may be prepared. The use of the diacetate as a source of dithiol, has the advantage that reactions may be effected in acid and alkaline media. The reagent also aids in the coagulation of precipitated metal sulphides and sulphur and may thus be used in conjunction with hydrogen sulphide, which may be supplied from a solid source such as thioacetamide, as an aid to coagulation. 1-8-Dimercapto-naphthalene may also be present as a coagulant. Precipitates are also obtained from solutions of metal compounds in aqueous pyridine. Complexes of the following metals are described:-palladium (ii), tellurium, gold, tungsten (vi), rhenium (vii), osmium, rhodium, arsenic, iridium, ruthenium, germanium, copper (i) and (ii), mercury, silver, antimony, tin, molybdenum, platinum, bismuth, cobalt, lead, cadmium, thallium, nickel, zinc, iron (ii), gallium, indium, manganese and vanadium. Examples illustrate detection, estimation, separation and purification processes applied to certain of the above metals and their compounds and the purification of sodium chloride from potassium compounds, magnesium sulphate from heavy metals, bismuth chloride from tellurium and the removal of iron, nickel, copper and cobalt from sodium or potassium carbonates, barium, sodium or potassium hydroxides and di- or tri-sodium or potassium phosphates.ALSO:S-Diacetyltoluene-3,4-dithiol, from which toluene-3,4-dithiol may readily be liberated, is used as a dressing for ores prior to flotation. |
| priorityDate | 1956-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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