Method for removing impurities from porous materials

Details Method for removing impurities from porous materials Method for removing impurities from porous materials

2006-10-24

2006-10-24

Carrillo, Sharidan (Department: 1746)

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

C134S022180, C134S022190, C134S031000, C134S034000, C134S035000, C134S036000, C134S042000

Reexamination Certificate

active

07124764

ABSTRACT:
The present invention discloses a method for removing impurities from a porous material by flowing a supercritical fluid with or without a modifier therein over a to-be-cleaned porous material having pores at the nanometer level under suitable temperatures and pressures, so that the supercritical fluid migrates into the pores at the nanometer level and removes impurities entrapped therein. The method of the present invention uses the physical and chemical properties of the supercritical fluid and optionally the modifier to clean the porous material without using an acid or alkaline solvent. The method of the present invention conserves water, and is both a highly efficient and environmentally friendly cleaning technique.

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