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    STUDIA CHEMIA - Ediţia nr.4 din 2014  
         
  Articol:   DESIGN OF ADSORPTIVE DISTILLATION FOR SEPARATION OF ETHANOL-WATER AZEOTROPIC MIXTURE USING BIO-BASED ADSORBENTS.

Autori:  . 		 
       
         
  Rezumat:  Ethanol is an important and commonly used solvent. Anhydrous ethanol is widely used in painting, medicine, cosmetics, perfume and chemical industries. Use of recyclable and cheaper alternatives such as bio-based adsorbents that are composed of cellulose and starch which exhibit strong affinity to water, is already developed as a part of purification and filtration process. A new design of setup for adsorptive distillation was used in this paper to separate water from ethanol due to its low energy consumption. Six raw materials namely sweet potatoes, sticky rice, corn, corn cobs, crystal sugar and date pits were evaluated for their efficiency of ethanol dehydration. Among the biobased adsorbents examined, sweet potato and sticky rice adsorbents due to higher starch consisted of amylopectin gave the best separation of ethanol-water azeotrope. By means of the selective water adsorption that was carried out in a fixed-bed adsorber packed with sticky rice and sweet potato, 99.9% anhydrous ethanol with high efficiency is obtained.

Keywords: biobased adsorbents, adsorption, adsorptive distillation, azeotrope, ethanol dehydration
 
         
     
         
         
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