http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-785779-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0efa077d881a96aeb1e29b21ef1bbb58 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J13-0069 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/B01J20-103 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C01B33-154 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J13-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J20-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B33-154 |
| filingDate | 1956-02-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-11-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-785779-A |
| titleOfInvention | A process for the continuous production of hydrogels containing silicic acid |
| abstract | <FORM:0785779/III/1> A silica sol is gelled by passage through a plurality of tubes in parallel, said tubes having a smooth inner surface and preferably having an internal diameter of 20-70 mm. The tubes may be of polystyrene, a polyvinyl compound, a polyacrylic compound, glass or ceramic material, corrosion-proof metal, enamelled metal or metal coated with stoving enamel. Any number of tubes, e.g. up to 200 or more, may be used. The tubes may be heated to a temperature of 40-100 DEG C., e.g. 70 DEG C. The resulting gel in the form of rods may be washed with water or water containing aluminium sulphate or ammonia at a temperature of 20-100 DEG C. The sol may be prepared by interacting a cooled aqueous acid, e.g. hydrochloric, sulphuric or nitric acid, and a cooled aqueous sodium silicate solution, maintaining the pH-of the mixture at 2-5 and the temperature at 5-10 DEG C. An alumina-containing sol may be prepared using an acid sulphuric acid containing aluminium sulphate. The silica sol may als be prepared by decomposition of a silicic acid ester, or a chloro- or bromo-silane, in the latter case in the presence of an alkalene oxide. As shown, sodium silicate and acid are passed through coolers 9 and 10 to a mixing vessel provided with cooling jacket 12. A cold solution of brine is passed in succession through the jacket 12 and coolers 9 and 10. The resulting sol is passed via diaphragm pumps 16 to a series of pipes 20 heated by water circulated from a heat exchanger 24 operated with steam. The resulting gel is ejected into a washing container 21 and after washing is removed on a conveyer belt 26. |
| priorityDate | 1955-02-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 34.