http://rdf.ncbi.nlm.nih.gov/pubchem/patent/AR-032071-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-406 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-40 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-20 |
| filingDate | 2001-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2003-10-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | AR-032071-A1 |
| titleOfInvention | A PROCESS TO PRODUCE POLYCARBONATE |
| abstract | An improvement in the melt transesterification reaction of the diaryl carbonate with dihydroxy aryl compound is revealed. The improvement involves the following steps: (i) introducing the resulting steam stream at mid-height of a first distillation column; (ii) separating the vapor stream into a top product containing high purity monohydroxy aryloxy compound and a first bottom product; (iii) recycle (reintroduce) the high purity monohydroxy aryl compound of step (ii), in the reaction; (iv) introduce the first bottom product at half height of a second distillation column; (v) separating said first product from the bottom as a by-product of the high boiling bottom and remaining constituents above; (vi) introduce the remaining constituents from above to mid-height of a third distillation column; (vii) separating said remaining constituents from above into higher boiling low fractions and into a bottom product or sidestream of product containing the diaryl carbonate product and (vii) recycling the diaryl carbonate product directly into the reaction of transesterification. |
| priorityDate | 2001-01-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID19660 http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID419559376 |
Total number of triples: 16.