Complex Processing of Adsorbent Used in the Purification of Hydrogen-Containing Gas

Abstract

The problems of processing spent adsorbents with a high concentration of chemisorbed chlorine-containing com-pounds for their reuse are studied in this article. The genesis of the phase composition and morphology at all tech-nological stages of thermochemical regeneration of the spent adsorbent - Axstrap-860 by means of alkaline modifi-cation with a combined solution of sodium and potassium hydroxides has been tested by diffractometry and ele-mental analysis. The results show that the formation of a layer with an increased concentration of alkali metals in the form of the corresponding carbonates and NaOH on the surface of the granules and in the volume of sodium and potassium aluminates provides adsorption of HCl, which are slightly inferior to the fresh adsorbent. The con-ditions for the removal of halogen-containing substances from technogenic raw materials with the subsequent iso-lation of useful products have been optimized: (1) crystalline NaCl intended for the preparation of electrolyte for electrode boilers and steam generators; (2) a mixture of chlorides and hydroxochlorides of aluminum tested in the process of coagulation purification of turbid natural and waste waters; (3) pseudoboehmite for the production of an adsorbent-desiccant and the synthesis of magnesium-aluminum spinel using the technology of destruction-epitaxial transformation, and a promising carrier for catalysts for steam reforming of hydrocarbons.