http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CZ-2008784-A3
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_82956763a701dc771bddde581858ba9f |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J20-282 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J20-281 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N30-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N30-50 |
| filingDate | 2008-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_34d16ec8d809c47e31ffcfb4299cb481 |
| publicationDate | 2010-06-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CZ-2008784-A3 |
| titleOfInvention | Sorbent for chromatography and method for its preparation |
| abstract | The subject of the invention is a sorbent for liquid and gas chromatography and a method for its preparation. It is a silica gel sorbent that has a continuously decreasing diameter and a volume of failure towards the center of the particles. The area around the center can be completely non-porous. The method of its preparation makes it possible to control the porosity and its gradient. Standard fully porous spherical or irregular silica gels are used for production. A sorbent which is the input material for modification with a solution of alkali silicate or an alkyl silanolate of suitable concentration and suspended in a liquid immiscible or only slightly miscible with water having a sufficiently high boiling point to distill it off, preferably in the form of a slurry. azeotropic mixture, water contained in the alkali silicate solution. By distilling off the water, the concentration of silicate in the sorbent particles increases and the volume of its solution decreases. Water is replaced by solvent in the outer layer. At a certain stage of the distillation, a silicate of such a viscosity is formed that it behaves as a solid phase in the sorbent pores. Then, the distillation can be terminated, the solvent and the silicate in the pores neutralized with an aqueous acid solution. The production of the sorbent can also be corrected by adding the solvent-soluble acid used for the distillation to the sorbent in the phase of water distillation or after its completion. Such a procedure is particularly important in cases where it is the intention to bring even liquid silica in the pores of the sorbent to gelation. |
| priorityDate | 2008-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 23.