http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CH-526503-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1374dd16777534b65ad4422333245af8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C67-52 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C69-82 |
| filingDate | 1968-12-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_492b9be1e07b5a812b66ea9a8133336a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_341e0e1940a44b2c1a79ef3bdd46ee9b http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e92bd5a3973eaa654ab3c24a620a1d0b |
| publicationDate | 1972-08-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CH-526503-A |
| titleOfInvention | Process for the production of bis (B-hydroxyethyl) terephthalate of a high degree of purity |
| abstract | Crude bis(beta-hydroxyethyl) terephthalate (BHET) is purified by (1) dissolving in a hot aromatic solvent to a concentration higher than the saturation solubility of the ester at the apparat melting point (Tm) of BHET in the solvent; the solvent is at a temp. higher than Tm, (2) cooling the solution very rapidly to below Tm so that the precipitate is not granular or lumpy, and (3) separating off the solid. Impurities are removed which retard the polycondensation of the ester and discolour the polymer and lower its melting point. Recrystallisation processes using other solvents, e.g. water (US. 3,062,862) and polar organic solvent (US. 3,120,560 and 3,268,575) are complicated by the high solubility of the ester in these solvents at ambient temp. |
| priorityDate | 1968-12-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 58.