| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6c8d4dc7bd1a30d8fda907fceaeb4e69 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D3-146
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-44
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D1-225 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-54
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D1-22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C67-54
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-44
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D3-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D1-00 |
| filingDate |
2002-10-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
2008-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1a255f92850e50e5825165e006af759d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_66396d4a5f897232e9e8ef563c1b26f6
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_41f4a40bf2bcbd41001852390ffddadf
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_20287ad8ab23859d4477af0f71cd6e81 |
| publicationDate |
2008-05-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CN-100389848-C |
| titleOfInvention |
Method for purifying (meth) acrylic acid |
| abstract |
A method for purifying a crude (meth)acrylic acid obtained by a vapor phase catalytic oxidation method, characterized in that the crude (meth)acrylic acid having most parts of water and acetic acid removed therefrom, is fed to and distilled in a first distillation column of a purification system comprising first to third three distillation columns, the top fraction from the first distillation column is fed to and distilled in the second distillation column, the resulting top fraction is recovered as a high purity (meth)acrylic acid product, the bottoms from the first and second distillation columns are fed to and distilled in the third distillation column, and the resulting top fraction is fed to the first distillation column. |
| priorityDate |
2001-10-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |