ALUMINA-CONTAINING ACID ADSORBENTS AND PROCESS FOR PRODUCING SAME

摘要

The invention relates to alumina-containing acid adsorbents and process for producing same. Activated alumina has been used as an acid adsorbent, but it is not very long-lived. The adsorbents of the invention comprise activated alumina having internal pores and an amorphous alkali (preferably sodium) aluminum silicate coating the inner surfaces of the pores. The ratio of Si:Al in the amorphous alkali material is preferably 0.25-100:1 by weight. A process for producing such adsorbents comprises treating activated alumina with a solution of an alkali metal silicate followed by an alkali metal aluminate, and forming agglomerates of the treated alumina at a temperature below about 90 .degree.C, aging the agglomerates at a temperature in the range of 20 - 90 .degree.C, and calcining the aged agglomerates at a temperature in the range of 200 - 500 .degree.C. The adsorbent can be used to remove acidic materials from gases and liquids during industrial processes and they have a greater effective life than activated alumina itself.