http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H04145037-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9db45cbaec0651cacea17f30f366beee |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-04 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C39-14 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C37-74 |
| filingDate | 1990-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f8bc6115d996265f9ab8d5916d597f5a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2c0f4d5e04b3ea7a67caeab0f34ec0c8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e2344933f6777f74bacfb08385406263 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ee977147321cbb3ea2efffb9978061ce |
| publicationDate | 1992-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H04145037-A |
| titleOfInvention | Method for distilling and purifying naphthol |
| abstract | PURPOSE: To remove high-boiling substances as a still residue and purify crude naphthol by subjecting the crude naphthol obtained by a sulfonation and alkali fusion method of naphthalene to pitch removing distillation under conditions satisfying a specific relational expression between the column bottom temperature and the distillation time. n CONSTITUTION: Crude naphthol obtained by a sulfonation and alkali fusion method of naphthalene is purified by distillation. In the process, the crude naphthol is subjected to pitch removing distillation under conditions satisfying the formula [t is the column bottom temperature (°C); θ is the distillation time (min)] to remove substances having a higher boiling point than that of the naphthol as a still residue. Since the high-boiling substances are removed, the formation of thionaphthol due to decomposition of heavy substances in the pitch removing distillation is suppressed to ≤0.1% and the deterioration in yield is simultaneously suppressed. Thereby, the high-purity naphthol can be obtained in high yield. n COPYRIGHT: (C)1992,JPO&Japio |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-104447216-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-106966873-A |
| priorityDate | 1990-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 27.