http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-S6314752-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7f9af914ed2fb00cd4f1b8b1a28964e4 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C57-07 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F2-00 |
| filingDate | 1986-07-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66756a04570c85e1cbcfcfe84cd74511 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_56789034e57e08fd0eb8f276726aee3b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7f7609308b575bbfdae1c377ead8ef84 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8dd9531ab80f791db97ee479e9c49ad9 |
| publicationDate | 1988-01-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-S6314752-A |
| titleOfInvention | Purification of methacrylic acid |
| abstract | PURPOSE: To obtain the titled compound having high purity, excellent polymerizability and reduced coloring of the formed polymer, by using a specific extracting solvent and treating the titled compound with a hydrazine in obtaining the titled compound by catalytic vapor-phase oxidation of isobutylene, etc. n CONSTITUTION: Isobutylene, tert-butanol, methacrolein, or isobutyl aldehyde is catalytically oxidized in the vapor phase and the resultant methacrylic acid (MAA)-containing reaction product gas is cooled and condensed to give an aqueous solution of the MAA. Light-boiling substances contained in the above- mentioned aqueous solution are then removed by distillation or stripping and the MAA is extracted from the resultant aqueous solution or the MAA using a 6W20C aliphatic chain saturated hydrocarbon as an extracting extracting solvent. The resultant MAA-containing solution is then treated in steps of separating the solvent, the light-boiling substance and heavy substances, redistilling and purifying the resultant product. In the steps, 0.001W1wt%, particularly 0.01W0.5wt% hydrazine, e.g. hydrazine hydrate or phenylhydrazine, is added to any step thereof (preferably the redistillation and purification step). n COPYRIGHT: (C)1988,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-11033834-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2019514937-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10610803-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-1297454-C http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2011514311-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2018097515-A1 |
| priorityDate | 1986-07-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 39.