http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-828382-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_fc90292a3c1114b40964e7b8944bfc20 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J2379-04 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08J5-2256 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08J5-22 |
| filingDate | 1957-11-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1960-02-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-828382-A |
| titleOfInvention | Improved permselective membranes, the process of producing them, and the applications of these membranes |
| abstract | Anionic and cationic permselective membranes for use in the electrodialytic demineralization of water are made by impregnating cellulosic parchment paper with an acidic aqueous solution comprising a salt containing a N-methylolamide group, formaldehyde and a phenol having at least two nuclear hydrogen atoms at which addition of formaldehyde can occur and drying the impregnated paper at a temperature of at least 120 DEG C. Exchangeable ionic groups are thus deposited in the paper and some cellulose molecules therein become cross-linked. The salt may be hydroxymethylcarbamylmethyl - trimethyl ammonium chloride, hydroxymethylcarbamylmethylisoquinolinium or - pyridinium chloride, methylolcarbamidomethyl - pyridinium chloride, acetamidomethylol sodium sulphonate or the chloride of mixed coal-tar bases quaternized with methylolchloracetamide. The phenol may be hydroxy-benzene and/or o- and/or m- and/or p-cresol or resorcinol. The pH of the solution is, preferably, brought to a value between 2.4 and 2.5 by adding hydrochloric acid. Specifications 733,100, 750,220, 750,238 and 813,607 are referred to.ALSO:Anionic and cationic permselective membranes are made by impregnating cellulosic parchment paper with an acidic aqueous solution comprising a salt containing a N-methylolamide group, formaldehyde and a phenol having at least two nuclear hydrogen atoms at which addition of formaldehyde can occur and drying the impregnated paper at a temperature of at least 120 DEG C. Exchangeable ionic groups are thus deposited in the paper and some cellulose molecules therein become cross-linked. The salt may be hydroxymethylcarbamylmethyltrimethyl ammonium chloride, hydroxymethylcarbamylmethyl - isoquinolinium or - pyridinium chloride, methylolcarbamidomethyl - pyridinium chloride, acetamidomethylol sodium sulphonate or the chloride of mixed coal-tar bases quaternized with methylol chloroacetamide. The phenol may be hydroxybenzene and/or o- and/or m- and/or p-cresol, or resorcinol. The pH of the solution is, preferably, brought to a value between 2.4 and 2.5 by adding hydrochloric acid. Specifications 733,100, 750,220, 750,238 and 813,607 are referred to. |
| priorityDate | 1956-11-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 42.