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OEM <br />Figure B-12. Process Flow of the BCyL Biomass Ethanol Plant 14 <br />2. Hydrolysis <br />The cellulose molecules are composed of long chains of sugar molecules. In order to <br />break the maUu|osa down into sugars, the hydrolysis process is employed. Thera are <br />two major cellulose hydrolysis processes: <br />al Acid hydrolysis - dilute add may be used under high heat and high pressure, <br />or more concentrated acid can be used at lower temperatures and pressure. A <br />deorysta|ized cellulosic mixture of acid and sugars reacts in the presence of <br />water to complete individual sugar molecules (hydrolysis). <br />b) Enzymatic hydrolysis - uses several enzymes at various stages of this <br />conversion and has the advantage that |ignoce||u|os|c materials can be <br />hydrolyzed with relatively mild processing conditions, which avoids the <br />formation of byproducts that would otherwise inhibit enzyme activity. <br />These have been utilized singly or in combination to break the cellulose chains into <br />free sugar, which is fermented for alcohol production. <br />14 Source: Abengoa8ioenergy <br />GBB/C08027-01 8-16 August 15i2OO8 <br />