http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-887731-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J19-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-275 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J19-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-275 |
| filingDate | 1958-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1962-01-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-887731-A |
| titleOfInvention | Oxidation of organic compounds to carboxylic acids by means of nitric acid |
| abstract | In a process for the oxidation of organic compounds to carboxylic acids by means of nitric acid the oxidation is conducted in an apparatus of which the surfaces coming into contact with the reacting mixture are of titanium or a titanium alloy containing at least 50% titanium. The process may be carried out at temperatures from about 100 DEG C. to about 300 DEG C. and pressures of about 5 to 250 atmospheres gauge. Metals specified for alloying with titanium are the metals of the Groups III to VIII of the Periodic Table especially nickel, chromium, molybdenum, manganese, vanadium, aluminium, zinconium or tin optionally together with small amounts of other metals. The apparatus may be in the form of an autoclave or a tube. The process may be continuous. Starting materials specified include aromatic compounds which contain a straight- or branched-alkyl group attached directly to the nucleus, e.g. a methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, decyl, dodecyl or octadecyl group or a substituted alkyl group, e.g. a chloro-butyl group. Substitution products referred to include those containing chloro-, bromo-, nitro, sulphonic acid or aldehyde radicals as nuclear substituents. Additional starting materials specified are chloro- and bromotoluenes, the xylenes, the various nitro, bromo or chloro xylenes, toluene sulphonic acids, pseudo-cumene-sulphonic acid, mesitylene, pseudo-cumene, ethyl benzene, methyl ethyl benzene, propyl benzene, diisopropyl benzene, cumene or cymenes, alkyl benzoic acids, e.g. toluic acid, aldehyde benzoic acids, chloromethyl compounds such as xylene dichloride, chlormethyl toluene, di(chlormethyl)-xylene, mono-(chloromethyl) xylene and the derivatives, e.g. the esters of the acids mentioned above, aliphatic or cycloaliphatic compounds, substantially straight- or branch-chained hydrocarbons and their substitution products such as alcohols, e.g. cyclohexanol or hexanol, and cyclohexanone, naphthalene, quinoline alkyl pyridine and derivatives thereof. Preferred starting materials are those which yield dicarboxylic acids with carboxylic groups in the para- and meta-positions as in terephthalic and isophthalic acids. The reaction may be interrupted at an intermediate stage to give, e.g. alkyl benzoic acids, e.g. toluic acids. In an example o-chlortoluene, p-xylene and 2-chlor-4-nitro-toluene are oxidised at a maximum temperature of 250 DEG C. with 15% nitric acid to the corresponding acids using a tubular reactor of substantially pure titanium. |
| priorityDate | 1957-12-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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Total number of triples: 95.