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ITS » Scientific Articles » Luar ITS Posted by email@example.com at 01/09/2016 14:55:46 • 634 Views
TECHNIQUE OF ETHANOL FOOD GRADE PRODUCTION WITH BATCH DISTILLATION AND DEHYDRATION USING STARCH-BASED ADSORBENT
Author : TRI WIDJAJA; ALI ALTWAY ( 196110211986031001; 195106041974121001 ) HIKMATUN NIMAHNAMIRA TEDJI; UMI ROFIQAH
Development and innovation of ethanol food grade production are becoming the reasearch priority to increase economy growth. Moreover the government of Indonesia has established regulation for increasing the renewable energy as primary energy. Sorghum is cerealia plant that contains 11-16 sugar that is optimum for fermentation process it is potential to be cultivated especially at barren area in Indonesia. The purpose of this experiment is to learn about the effect of microorganisms in fermentation process. Fermentation process was carried out batchwise in bioreactor and used 150gL initial sugar concentration. Microorganisms used in this experiment are Zymomonas mobilis mutation A3 Saccharomyces cerevisiae and mixed of Pichia stipitis. The yield of ethanol can be obtained from this experiment. For ethanol purification result distillation process from fermentation process has been done to search the best operation condition for efficiency energy consumption. The experiment for purification was divided into two parts which are distillation with structured packing steel wool and adsorption dehydration sequencely. In distillation part parameters evaluation HETP and pressure drop of distillation column that can be used for scale up are needed. The experiment was operated at pressure of 1 atm. The distillation stage was carried out at 85 C and reflux ratio of 0.92 with variety porosities of 20 40 and 60. Then the adsorption process was done at 120C and two types of adsorbent which are starch based adsorbent with ingredient of cassava and molecular sieve 3A were used. The adsorption process was then continued to purify the ethanol from impurities by using activated carbon. This research shows that the batch fermentation process with Zymomonas mobilis A3 obtain higher yield of ethanol of 4092. In addition to that for purification process the best operation condition is by using 40 of porosity of stuctured packing steel wool in distillation stage and starch-based adsorbent in adsorption stage which can obtain ethanol content of 9215 with acetic acid percentage of 0001 and the rest is water. This result is qualified for ethanol food grade specification which is between 90 - 94 of ethanol with maximum percentage of acetic acid is 0003 and passes in fusel oil and isopropyl alcohol test.