http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2014102305-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_8e0bf0928b608797b70bbc2b91c7e52e http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ead8fbc0650beeb81440fadd46a6cf21 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2381-06 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J11-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-23 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J11-02 |
| filingDate | 2013-12-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bdd27aabf235b7e0f027a1aa2daf6fb3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6a012cbc61f74bcee25dccfa94b04bca http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_58c3ab1b629abf69cd504f15548429b5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_86847a5813d67e075eb6b92c1440558a http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_d1d7b1626dc57389f89c2b1fd4d1a5ad |
| publicationDate | 2014-07-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-2014102305-A1 |
| titleOfInvention | Method for purifying a recycling flow from a plant for producing polyarylene ether sulfones |
| abstract | The invention relates to a method for purifying a recycling flow (1) from a plant for producing polyarylene ether sulfones by polycondensing aromatic bis-halogen compounds and aromatic bisphenols or salts thereof in the presence of at least one alkali-metal carbonate or hydrogencarbonate or ammonium carbonate or hydrogencarbonate in an N-alkyl-2-pyrrolidone as a solvent, containing: 60 to 90 wt% of water, 10 to 40 wt% of the N-alkyl-2-pyrrolidone, and, as a specification-impairing contaminant, up to 5000 ppm by weight of the N-alkyl succinimide corresponding to the N-alkyl-2-pyrrolidone and in addition thereto up to 1000 ppm by weight of additional high boilers in relation to the N-alkyl-2-pyrrolidone, in particular inorganic salts, in each case with respect to the total weight of the recycling flow (1), the sum of the components equaling 100 wt%, so as to obtain a pure N-alkyl-2-pyrrolidone flow (2), which can be fed back into the plant for producing polyarylene ether sulfones, by means of purification by distillation in a purification column (K), the method being characterized in that a pre-purification by evaporation in one or more evaporator stages in order to reduce the content of high boilers in relation to the N-alkyl-2-pyrrolidone is performed before the purification by distillation, one or more vapor flows (4, 5) being obtained, which are fed to the purification column (K) as feed flows, the bottom flow (6) from the last evaporator stage being discharged and a partial flow (9) of the bottom flow (7) from the purification column (K) being discharged and the rest of the bottom flow from the purification column (K) being recycled into the last evaporator stage, and the one or the first of the several evaporator stages being a column (WK) that is designed in such a way that the top flow (10) therefrom contains at most 200 ppm by weight of the N-alkyl-2-pyrrolidone with respect to the total weight of the top flow therefrom, the top flow therefrom being discharged, and the vapor flows (4, 5) being fed to the purification column (K) in vapor form. |
| priorityDate | 2012-12-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 36.