http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2331805-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_69464d2b95051eb6fbbec252560d05e6 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-43 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-43 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C63-24 |
| filingDate | 1999-04-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f482b5e6e092bee129fadd8ecb1f8350 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_da81320150b3f9aaeed2cc0b927fc275 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6322a0576ab6512bd94c3c44d5945e75 |
| publicationDate | 1999-11-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2331805-A1 |
| titleOfInvention | Process for purifying isophthalic acid by crystallization |
| abstract | Disclosed is a method for preparing isophthalic acid from metaxylene and especially for purifying crude isophthalic acid (IPA) produced in the course of such method, or otherwise, from a liquid dispersion thereof also containing impurities selected from unreacted starting materials, solvents, products of side reactions and/or other undesired materials. The purifying portion of the method comprises the step of: (1) filtering the dispersion to form a crude IPA filter cake; (2) dissolving the filter cake in a selective crystallization solvent at an elevated temperature to form a solution; (3) crystallizing purified IPA from the solution in the crystallization solvent by reducing the temperature, or pressure, or both of the solution; (4) separating the crystallized purified IPA from the solution; and (5) re-dissolving or soaking the washed purified IPA cake at elevated temperature, to remove the final traces of the crystallization solvent and obtain the desirable particle sizes and shape. Preferably, the selective crystallization solvent is N-methyl pyrrolidone. |
| priorityDate | 1998-05-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 64.