http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-2639620-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_59aeacfc8c0fb15a69d7dd77723e2c36 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C09K8-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09K8-08 |
| filingDate | 1976-09-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3458d9b5dd6d60a903f53424551cc0e8 |
| publicationDate | 1978-03-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-2639620-A1 |
| titleOfInvention | PROCESS FOR THE PREPARATION OF VISCOSE, Aqueous SALT SOLUTIONS |
| abstract | Thickened aq. brine is made contg. >=0.025 wt. % carboxymethylhydroxyethylcellulose (CMHEC) with a carboxymethyl D.S. of 0.2-0.6 and a hydroxyethyl M.S. of 1.5-3.0, cross linked in soln. with a polyvalent metal cation added in the form of a salt in a ratio metal cation/COOH gp. of 0.025-1% molar, resp. 0.025-0.4% molar. The thickened aq. brines are esp. useful for recovering secondary amts. of oil from oil wells, in which a drive fluid is pumped into the well to force out additional amts. of oil. The thickener prevents 'fingering' of the fluid into permeable zones in the formation. The cross-linked CMHEC gives good thickening at low concn. is soluble in brine, and gives a fluid whose viscosity remains stable over long periods. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0177158-A2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0177158-A3 |
| priorityDate | 1976-09-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.