http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-482736-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_214804ffd6c2d1d8fd6ce24b8a84bdde |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-39 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-252 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-25 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-39 |
| filingDate | 1936-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1938-04-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-482736-A |
| titleOfInvention | Process for the manufacture of methacrylic acid and esters thereof |
| abstract | Methacrylic acid is manufactured by oxidizing a -methylacrolein by means of oxygen or oxygen-containing gases in the presence of organic solvents, preferably chlorinated hydrocarbons, e.g. carbon tetrachloride or trichlorethylene, or aromatic hydrocarbons, e.g. benzene, if desired in the presence of compounds of heavy metals, e.g. iron, copper, nickel, cobalt or manganese salts, preferably of organic acids, especially of acrylic or methacrylic acid. The oxidation may be effected at normal, reduced or increased pressure, advantageously at about 20-60 DEG C. The concentration of a -methylacrolein may be up to about 80 per cent, but preferably below 50 per cent, advantageously 10-25 per cent. The oxidation may be carried out in the presence of antipolymerization catalysts, e.g. sulphur or alcohols, but these, especially phenolic compounds such as hydroquinone or b -naphthol are preferably added after the oxidation to prevent polymerization during the working up. If alcohols are employed, esterification may be carried out simultaneously. In examples: (1) a -methylacrolein dissolved in benzene is treated with air under atmospheric pressure; the methacrylic acid formed may be esterified by means of methanol in the presence of sulphuric acid and hydroquinone; (2) oxygen under 20 atmospheres pressure is employed as oxidizing agent; (3) oxygen at 2 atmospheres pressure is employed and copper acrylate is added as catalyst. a -Methylacrolein is obtainable by dehydrogenation or oxidation of a -methylallyl alcohol. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2783493-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1253703-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-1543046-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3271446-A |
| priorityDate | 1935-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 48.