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son <br />������xmm��m������0 Plant 14 <br />Figure B-12. Process Flow of the - _. ..~ <br />2. <br />Hydrolysis <br />nn�edof long chaimsuf sugar nno|ecuhas. In order to <br />The cellulose nnu|eou|�san�corn,---- <br />break the cellulose down into sugars, the hydrolysis process is employed. There 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 />deoryata|ized cellulosic mixture of add and sugars nnac±o in the presence of <br />water to complete individual sugar molecules (hydrolysis)- <br />bl Enzymatic hydrolysis - uses several enzymes at various stages of this conversion and has the advantage that |ignoceUu|oaic 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: Abengoa Bioenergy <br />G B-16 Augu��15,2OO8 <br />BE�CO8O2�-01 <br />