http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-314573-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7b04f5b6a02051c94d6eaf190b751ed2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_4f2a4863dab8c9be447cafff29cef5ee |
| filingDate | 1928-03-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1929-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-314573-A |
| titleOfInvention | Improvements in or relating to the reduction of aromatic nitro compounds |
| abstract | 314,573. I. G. Farbenindustrie Akt.- Ges., and Carpmael, A. March 29, 1928. Addition to 263,376. Aromatic amines.-The method of the parent Specification for the reduction of aromatic nitro compounds to the corresponding amino compounds with the simultaneous production of an iron oxide pigment, is modified in that the reduction is carried out with iron and a salt giving an acid aqueous solution on account of hydrolysis and in the presence of an aqueous suspension of a sparingly soluble basic compound of a tri- or tetra-valent metal. The sparingly soluble basic compound, which may be a hydroxide, oxide, or basic salt, is added as such or is produced in the the reaction mixture by addition of a basic substance to a solution of a salt of the metal: the precipitant may be an alkali or alkaline earth hydroxide or carbonate or the amino compound to be produced. Suitable sparingly soluble basic compounds are aluminium hydroxide, oxide, basic silicate, and basic sulphate, iron oxide and hydroxide, cerium oxide, dioxide, and hydroxide, thorium oxide, hydroxide, and basic carbonate, lanthanum oxide and hydroxide, didymium oxide and hydroxide and like rare earth metal compounds, and titanium dioxide. In the examples, nitro-benzene is reduced (1) with iron and aniline hydrochloride in the presence of aluminium hydroxide precipitated from a solution of aluminium sulphate by means of sodium carbonate; (2) with iron in a suspension of cerium hydroxide in aniline hydrochloride solution obtained by treating cerium chloride solution with aniline; (3) with iron in a medium obtained by treating ferric chloride solution with chalk. In each case the residue left after separating the aniline is suitable, after washing and drying, for use as a pigment either directly or after calcination. Reference is made also to the reduction of nitrotoluenes and other nitrated homologues of benzene, chloro- and amino-nitro compounds and nitrosulphonic acids. |
| priorityDate | 1928-03-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 59.