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Verfahren zur Modifizierung der Oberflaechen von feinporoesen Adsorbentien

Process to modify adsorption properties fine-pored molecular sieve by contact with dissolved agent under super-critical conditions.
 
: Weber, A.; Guderian, J.; Jelen, E.; Heil, V.

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Frontpage ()

DE 2000-10002080 A: 20000117
DE 2000-10024312 A: 20000517
WO 2001-EP503 A: 20010117
EP 2001-911495 AW: 20010117
DE 10024312 A1: 20010726
EP 1250189 B1: 20050622
B01J0020
German
Patent, Electronic Publication
Fraunhofer UMSICHT Oberhausen ()

Abstract
Die Erfindung betrifft ein Verfahren zur Modifizierung der (inneren) Oberflaeche eines MMMS-poroesen Adsorbens oder eines Gemisches mehrerer MMMS-poroeser Adsorbentien. Diese werden mit einem Fluid kontaktiert, welches sich unter ueberkritischen Bedingungen befindet und ein oder mehrere Modifizierungsmittel geloest und/oder dispergiert enthaelt. Das Modifizierungsmittel wird entweder vor oder waehrend des Kontaktierens in dem Fluid geloest und/oder dispergiert.

 

DE 10024312 A UPAB: 20010829 NOVELTY - A process modifies the adsorption properties of the inner surface of a substance with macro and/or meso and/or micro and/or sub-micro-pores (MMMS-porous). The adsorbent surfaces are brought into contact with a fluid which is under super-critical conditions and contains one or more dissolved or dispersed modification agents. The modification agent is dissolved or dispersed in the fluid prior to or during contact with the fluid. DETAILED DESCRIPTION - Examples are the use of zirconium(IV) oxide, palmitic acid, or oleic acid to modify active carbon or coke in a process to manufacture a molecular sieve and in which the fine-pored adsorbent is activated following heat treatment. In a process to modify active carbon with oleic acid, 0.5 g of grains of non-dried and untreated gas filter form-active carbon are weighed and introduced into a solution of 0.25 g oleic acid in 4.5 ml super-critical carbon dioxide at a temperature of 50C and pressure of 200 bar for 30 min. The pressure is then relaxed at the rate of 2 bar/min, desorbing carbon dioxide from the carbon, leaving the oleic acid in the active carbon. USE - The process is used to manufacture a fine-pored molecular sieve e.g. for special adsorption and chromatography applications. ADVANTAGE - The process facilitates the creation of high-grade selective catalytic adsorbents.

: http://publica.fraunhofer.de/documents/PX-69801.html