http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2012071670-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2855c35755052177bc759d070c3d762d http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9551618bf6432b58d4a77a794e4ab05b http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d9777d66312b4ba43d3e406339ee334e http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_607aa5af210e2b8f893a740a56e7b4e1 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D207-267 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D207-267 |
| filingDate | 2010-11-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1eea175b585d631e166bb5f53af965ff http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_12e98beabf174ee43f0917a78e2f9d94 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a0c158046da96a8d6713e8f711fe691a |
| publicationDate | 2012-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-2012071670-A1 |
| titleOfInvention | Method for producing of ultra-clean and high-purity n-methyl pyrrolidone |
| abstract | The present invention provides a method for producing of ultra-clean and high-purity N-methyl pyrrolidone through using industrial grade N-methyl pyrrolidone as raw material. After the pretreatment, sorption and dehydration with 4A molecular sieve, twice membrane filtrations are carried out through using β-cyclodextrin composite membrane for the first and 18-crown-6 composite membrane for the second. The filtrate is rectified under vacuum and filtered through using complexant composite microporous membrane to obtain the product. The ultra-clean and high-purity N-methyl pyrrolidone, produced by the method provided by the present invention, is up to the SEMI C8 standard. And the purity of the product is over 99.8%, the moisture content is less than 0.03%, and the content of single metal ion is less than 1 ppb. Comparing to the prior art, the present invention has the advantage such as the stable quality of the product, simple operation, and is suitable for industrial continuous production. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112094217-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-111269163-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-102863615-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-112094216-A |
| priorityDate | 2010-09-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 43.