Patent ID: 6248683
Filing Date: 2001-06-19
Classification: B01D,B01J

Abstract:
A process for the regeneration of a particulate material comprising silica, silica gel, alumina, silicate materials, clays or sand, comprising the steps of:a) contacting the material with an extractant of organic compounds for a period of time sufficient to dissolve the organic compounds, carrying out a solid-liquid separation, and heating to remove substantially all extractant from the particulate material;b) contacting the material obtained from step a) with an oxidizing agent, and optionally carrying out a solid-liquid separation; wherein the oxidizing agent is selected from the group consisting of oxygen in its triplet or singlet states; ozone; hydrogen peroxide; hydroxyl radical precursors; compounds of formula XYO.sub.z wherein z varies from 1-4, X is an alkali metal or alkaline earth metal and Y is a halogen; chlorine, bromine or iodine, or any precursor thereof; aqua regia; a heavy metal oxidant: Caro's acid; oxones; mono and persurfate derivatives; per-acids; and compatible mixtures thereof;c) contacting the material obtained from step b) with an acidic solution to extract inorganic compounds, metals and metal salts, and carrying out a solid-liquid separation;d) heating the material obtained from step c) to a temperature sufficiently high to evaporate water and combust carbon-containing compounds; ande) recovering regenerated material.