Gasoline drilled in the Garden Cassava

Cassava is processed into bioethanol, a substitute for a premium. According to Dr Ir H Soerawidjaja Tatang, from Tcknik Chemistry Institute of Technology Bandung (ITB), one source of cassava starch. Complex carbohydrates starch compounds. Before fermented, starch is converted into glucose, a more simple carbohydrates. To break down starch, need the help of the fungus Aspergillus sp. Fungi that produce enzymes that play a role gliikoamilase alfamilase and parse the starch into simple sugars glucose alias. After the sugar, bam fermented into ethanol.

Then how to process cassava into ethanol? The following steps of making bioethanol made from cassava that dilerapkan Tatang H Soerawidjaja. The following processing capacity of 10 liters per day.

1. 125 kg of fresh cassava peel, all kinds of dapal utilized. Clean and cut up into small sized.

2. Dry cassava that has been chopped up to a maximum of 16% water content. Just dried cassava into dried cassava. The goal is to make it more durable so that manufacturers can save a backup of raw materials

3.Masukkan 25 kg of dried cassava into a stainless tank with a capacity of 120 liters of the eel, then add water until it reaches a volume of 100 liters. Heat the dried cassava to 100 "C for 0.5 hours. Stir until it becomes mush boiled cassava and thickens.

4. Chill the cassava porridge, and enter into the langki saccharification. Saccharification is the process of decomposition of starch into glucose. Once cool, enter the Aspergillus fungus that will break down starch into glucose. To decipher the 100 liters of cassava starch slurry. need 10 liters of solution of the fungus Aspergillus or 10% of the total pulp. The concentration of the fungus reaches 100-million cells / ml. Sebclum used, Aspergilhis dikuhurkan on cassava pulp that has been cooked earlier that the chemical properties of adaptive with dried cassava pulp. Fungi proliferate and work break down starch

5.Dua hours later, cassava porridge turns into two layers: water and sediment of sugar. Stir again already starch into sugar, then put into fermentation tanks. However, before the fermentable sugar ensure a maximum of 17-18% starch solution. It is the preferred maximum sugar content Saccharomyces unluk bacteria live and work down sugar into alcohol. If lebth high sugar content, add water until it reaches the desired level. Otherwise, add the sugar solution in order to achieve maximum sugar content.

6 Close tightly to prevent contamination of the fermentation tank and Saccharomyces work more optimally break down glucose. Anaerobic fermentation takes place alias does not require oxygen. In order for optimal fermentation, keep the temperature at 28-32 "C and pH 4.5 to 5.5.

7. After 2-3 days, the solution turns starch into 3 layers. The bottom layer of sediment protein. On top of water, and ethanol. The results of fermentation is called beer containing 6-12% ethanol

8.Sedot ethanol solution with a plastic tube through a 1 micron filter paper to filter sediment proteins.

9. Although it has been filtered, ethanol still bercampurair. To separate them, do the distillation or refining. Heat the mixture of water and ethanol at a temperature of 78 "C or equivalent boiling point of ethanol. At that temperature first ethanol evaporates rather than boiling water 100 ° C. The ethanol vapor is passed through a submerged pipe and the water so condensed back into liquid ethanol.

10 The results of distillation of 95% ethanol and insoluble in gasoline. In order larul, ethanol yield of 99% is required or called dry ethanol. Therefore, it is necessary distillation absorbent. 95% ethanol was heated 100 "C. At temperatures Ilu, ethanol and water evaporate. Steam both then passed into a pipe whose walls are coated zeolite or starch. Zeolite will absorb the remaining moisture content of 99% ethanol to obtain a ready dieampur denganbensin. Ten liters of 99% ethanol, requiring 120-130 lifer beer produced from 25 kg of dried cassava