<p><strong><em>Abstract : </em></strong><em>Petroleum reserves in the world are dwindling, leading to efforts to obtain renewable energy sources.</em><em> </em><em>Prospects of development of bioethanol industry in Indonesia is quite interesting, because Indonesia has a variety of natural resources that can be processed into bioethanol.</em><em> </em><em>Drying technology is currently used to produce ethanol fuel such as membranes, Pressure Swing Adsorption and vapor phase adsorption.</em><em> </em><em>Adsorption is a method that is simple and relatively inexpensive.</em><em> </em><em>This research aims at studying the characteristics of ethanol adsorption capacity by a mixture of zeolite and silica gel to the acquisition of ethanol concentration.</em><em> </em><em>The process of vapor phase adsorption of ethanol occurs in fixed bed column using a feed with a concentration of 93-95% ethanol. Ethanol fermentation first purified using a distillation process in the column packing material to get the concentration.</em><em> </em><em>Ethanol liquid feed is vaporized in the tank.</em><em> </em><em>Ethanol vapor then flowed into the fixed bed column containing a mixture of active zeolite and silica. Water vapor adsorbed by the adsorbent in the column stack of this bed.</em><em> </em><em>Ethanol vapor that not adsorbed is then condensed.</em><em> Liquid ethanol results of the condensation process </em><em>is fuel grade ethanol.</em><em> </em><em>The variables studied were weight ratio of zeolite-silica gel (g) (75:25; 50:50, and 25:75) and type in a structured or random piles.</em><em> </em><em>Sampling for analysis of ethanol levels done every 5 minutes for 30 minutes at a temperature of 12 </em><em>°</em><em> C.</em><em> </em><em>The analysis was done by measuring the density of the solution condensation of the output of the column adsorber.</em><em> </em><em>In this research, obtained the highest ethanol content for this type of pile structured weight ratio zeolite: silica gel (g) respectively 75:25; 50:50, and 25:75 is the 99.2313% 99.5816%, and 99,</em><em> </em><em>9582%.</em><em> </em><em>In a random pile of ethanol content obtained by 99.6363%, 98.3215% and 99.881%.</em><em> </em><em>The maximum ethanol content obtained on zeolite-silica gel ratio 25:75 for both structured and random mix.</em><em> This is because the ratio of Si/Al-silica gel is greater than the zeolite thus more effective in the adsorption of ethanol. And derived ethanol content in the stack is more stable than the unstructured random. </em></p><p><em> </em><strong><em>Keywords: </em></strong><em>Adsorption, Zeolite Silica, Ethanol fuel grade</em></p><p> </p>
(149)On the Catalytic Hydrolysis of Chlorobenzene to Phenol in Vapor Phase. I Relationship between the Method of Preparing the Silica Gel-Cupric Chloride Catalyst and the Catalyst-Activity.
