http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2003040830-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_7e7022e391363a3cf3486bf3859ce0a7 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-15 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C65-11 |
| filingDate | 2001-07-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_52f23d86fc8781c2329cc7ca2ca709a5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_39ce8da3d51d091af466c2a0767f1bd1 |
| publicationDate | 2003-02-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2003040830-A |
| titleOfInvention | Method for producing 1,4-dihydroxy-2-naphthoic acid and alkali metal salt thereof and novel crystal of 1,4-dihydroxy-2-naphthoic acid |
| abstract | PROBLEM TO BE SOLVED: To provide a simple, efficient and industrially useful production method of a compound (II) and an alkali metal salt thereof without requiring high temperature and high pressure, and to provide a compound (II). Providing industrially useful new crystals. SOLUTION: A compound (II) or an alkali metal salt thereof is produced by carboxylating an alkali metal salt of 1,4-dihydroxynaphthalene in a amide solvent using carbon dioxide gas. 1,4-dihydroxynaphthalene to 1,4 -After obtaining an alkali metal salt of dihydroxynaphthalene and subsequently carboxylating the same, the compound (II) was dissolved in 1.5 to 2.5 parts by weight of an amide solvent based on 1 part by weight of 1,4-dihydroxynaphthalene. An acid is allowed to act on an alkali metal salt to produce a new crystal of compound (II) having a bulk density of 0.3 to 0.5 g / ml or an average particle diameter of D50 (%) of 35 to 50 μm. To manufacture. Embedded image |
| priorityDate | 2001-07-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 45.