| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_863a2610906cb9093ef626f710d98c49 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-80
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-685
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01D3-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C37-74 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01D3-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-80
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-74
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-68 |
| filingDate |
1995-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1997-10-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fc87f70085df7d8c46a8f49d97586293
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8c9a24d9c6d91d306a085917f5c8f9bc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cd3b1a8891fbff2d228273a6919210d2
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0c9fd259bebb58810472ac99e839322b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2f84cbe353a63a379a248d1a8feb9cfe |
| publicationDate |
1997-10-21-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5679223-A |
| titleOfInvention |
Method for separating and purifying catechol mixtures |
| abstract |
An extractive distillation process using a high boiling polyol such as glycerol is employed for separating high purity catechol, 3-methylcatechol and 4-methylcatechol from a high boiling, pitch-like dihydric phenol fraction. Fractional distillation first separates an impure overhead mixture of the catechol and 3-methylcatechol and an impure 4-methylcatechol bottoms. The impure overhead is extractively distilled to remove impurities and then extractively distilled again to separate the catechol and 3-methylcatechol. This produces a pure overhead of 3-methylcatechol and a bottoms of catechol and polyol which is distilled to recover the catechol and recycle the polyol. The impure 4-methylcatechol is distilled to remove residual material and then extractively distilled to remove impurities. The resulting mixture of 4-methylcatechol and polyol is distilled to recover the pure 4-methylcatechol and to recycle the polyol. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8628849-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/FR-2925489-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2009077556-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5964987-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2011064950-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101903322-B
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-101903322-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6217725-B1 |
| priorityDate |
1995-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |