http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-662076-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_496ac12dc63f452850ae9b4acd579c07 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C211-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C211-50 |
| filingDate | 1949-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1951-11-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-662076-A |
| titleOfInvention | Improvements in or relating to the reduction of aromatic nitro-compounds by means ofalkali metal amalgams |
| abstract | Aromatic nitro-compounds are reduced by an alkali metal amalgam and a reagent which is decomposed by the amalgam to give free hydrogen, the nitro-compound, amalgam and decomposition agent being brought together in the presence of carbon which may be impregnated with ferric chloride. The decomposition agent may be water together with a solvent for the nitro-compound, e.g. when reducing nitrobenzene it may be 50-80 per cent aqueous alcohol, especially 70 per cent alcohol. The carbon may be in the form of graphite, coke, electrode carbon or activated carbon (powder or moulded). By this process, nitrobenzene is reduced progressively to azoxybenzene, azobenzene and hydrazobenzene, practically no aniline being formed. Graphs are given of the amount of alkali metal used for each stage of reduction, using graphite lumps with or without impregnation with ferric chloride solution. The process may be carried out continuously, the reactants being brought together and a corresponding quantity of product simultaneously removed. Suitable apparatus is shown for continuous operation in two or more stages, the amalgam and solution moving in counter-current and reduction taking place successively in different reactors. The hydrazobenzene produced may be separated from azobenzene by crystallization from alcohol. Specifications 200,167 and 203,059 are referred to. The Specification as open to inspection under Sect. 91 refers to the reduction of organic and inorganic compounds in general by bringing them into contact with alkali metal amalgam and a decomposition agent in the presence of any substance or substances by which the decomposition is accelerated. The reduction of aromatic and aliphatic aldehydes and ketones to the corresponding alcohols is mentioned. This subject-matter does not appear in the Specification as accepted.ALSO:The Specification as open to inspection under Sect. 91 refers to the reduction of inorganic and organic compounds in general by bringing them into contact with an alkali metal amalgam, a reagent which is decomposed by the amalgam to give free hydrogen (e.g. water) and a substance or substances to accelerate such decomposition. The decomposition accelerator may be carbon in the form of graphite, coke, electrode carbon or activated carbon (powder or moulded) and may contain iron, introduced, e.g. by impregnation with aqueous ferric chloride and drying. The process is stated to be applicable to the preparation of sodium hyposulphite from sodium bisulphite. This subject-matter does not appear in the Specification as accepted. |
| priorityDate | 1948-04-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 37.