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If adsorption is accompanied with distillation in a column, the whole process may produce favorable effect on separation. For example, when certain amount of zeolite is added to an ethanol-water mixture, the azeotrope is no longer the barrier of separation. The patent continuous adsorptive distillation process, developed by the authors, is described. This process seems attractive in the separation of a mixture having azeotrope or close-boiling pair and the removal of trace impurity in some fine chemicals by adsorption, as well as leading to the development of selective adsorption.Experimental work was undertaken for the separation of ethanol-water mixture near azeotropic composition and for the separation of ethyl acetate-water-n-butanol mixture, using zeolite as adsorbent. The operations were continuous and almost pure ethanol, ethyl acetate and n-butanol were produced.
For example, when a certain amount of zeolite is added to an ethanol-water mixture, the azeotrope is no longer the barrier of separation. The patent continuous adsorptive distillation process, developed by the authors, is described. This process seems attractive in the separation of a mixture having azeotrope or close-boiling pair and the removal of trace impurity in some fine chemicals by adsorption, as well as leading to the development of selective adsorption. Experimental work was undertaken for the separation of ethanol-water mixture near azeotropic composition and for the separation of ethyl acetate-water-n-butanol mixture, using zeolite as adsorbent. The operations were continuous and almost pure ethanol, ethyl acetate and n-butanol were produced.