| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1c5b6b631e9b13f78818679500df4f81 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-783
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-48
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-37
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C45-35
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C57-04 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-81
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C47-22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-48
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-37
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C45-35
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C57-07
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-00 |
| filingDate |
1991-10-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1993-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6dbe813a7dc568588853c1d1f8877b12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8c475e94c2c88203ec77cadfc90b95de
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e42a29531d5ca9e3e874c2249cef1a59
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bf5ba6236bbdf6a1eb4ebca6d255894d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_78e52ee05984d5cf1507a47241aa2656 |
| publicationDate |
1993-09-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5248819-A |
| titleOfInvention |
Process for recovering methacrolein |
| abstract |
In the production of methacrylic acid by the vapor phase catalytic oxidation of isobutylene, t-butanol, methacrolein isobutyl aldehyde or isobutyric acid, or mixture thereof, the reaction product gas is condensed by contact with an aqueous phase containing methacrylic acid and acetic acid thereby forming an aqueous solution of methacrylic acid and a gas phase containing methacrolein and methacrylic acid. The aqueous solution of methacrylic acid is extracted with a saturated hydrocarbon solvent containing from 6-9 carbon atoms. The methacrylic acid is extracted into the solvent phase and an aqueous phase containing acetic acid is also formed. Methacrolein is recovered from the gas containing methacrolein and methacrylic acid by contacting the gas with an aqueous phase containing methacrylic acid and acetic acid. An aqueous phase containing methacrylic acid, acetic acid and methacrolein is formed in the methacrolein recovery step. This aqueous phase is contacted with a molecular oxygen containing gas to desorb methacrolein into a gas containing methacrylic acid and methacrolein and also forming an aqueous phase containing methacrylic acid and acetic acid. This aqueous phase is recycled to either or both of the methacrylic acid condensation step and the methacrolein recovery step. Methacrylic acid is recovered from the gas containing methacrylic acid and methacrolein produced in the methacrolein desorption step by mixing this gas with an aqueous phase containing acetic acid recovered from the methacrylic acid extraction step (C). This results in a gas-containing methacrolein which is recycled to the vapor phase reaction. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2546228-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-2085376-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5990343-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-3608305-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2013164216-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6051736-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6180819-B1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9732023-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5356460-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8889088-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2014146961-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2022214860-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2020030374-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5877345-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010260647-A1 |
| priorityDate |
1988-03-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |