http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-8301263-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_f000fefffa3808853388291a30640521 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/D21C9-02 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/D21C9-02 |
| filingDate | 1981-10-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_987f1ddfb6879c507cd5d16748f0c012 |
| publicationDate | 1983-04-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | WO-8301263-A1 |
| titleOfInvention | An improved process for displacement washing of porous media |
| abstract | Improved displacement washing method for recovering treatment chemicals from a porous medium, including wood pulp. The effective mobility of a displacement solution, generally a more dilute solution than the chemical to be recovered, is reduced so that it is less than the mobility of the solution to be recovered. In a pulp mill washing system, the consumption of washing water can be reduced by 0.6 tonnes per tonne of pulp produced without reducing the extraction of the chemical. Conversely, the chemical effluent from the washing device could be reduced by 50% without increasing the amount of washing water required. The mobility is proportional to the permeability of the porous medium relative to the solution to be extracted and inversely proportional to the viscosity of this solution. The mobility of the washing solution relative to the solution to be moved is preferably reduced by the addition of a soluble polymer of high molecular weight, greater than 106, until the ratio between the mobility of the washing solution and the mobility of the chemical-rich solution is in the range of 0.05 to 2.0, preferably in the range of 0.2 to 1. It has been noted that copolymers of acrylamide and acrylic acid, carboxypolymethylene, polyacrylic acid and deacetylated chitin effectively reduce mobility. The presence of 6-10 ppm of a copolymer of acrylamide and acrylic acid with a molecular weight greater than 106 in the washing solution of a washing device for unbleached fibers can double the performance of the washing device. |
| priorityDate | 1981-10-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 17.