Teaching Document Essay Example | Topics and Well Written Essays - 500 words

Teaching Document - Essay Example The other chemicals used include: alpha amylase enzyme, gluco-amylase enzyme and carbon which is used in the adsorbers as a decolorizer. The process occurs in five main stages; two hydrolysis processes that convert about 100% of the starch in the slurry into glucose and three evaporation processes to dry up the glucose. The starch slurry first flows into the first hydrolyser, R1, which converts 25% of the starch into glucose using alpha-amylase enzyme that catalyzes the hydrolysis process. After the first hydrolysis process, the viscosity of the slurry is reduced, and the slurry is then passed through a centrifuge, PS-1, which removes any proteins and oils present. The slurry is then passed through the second hydrolyser, R-2, which completes the hydrolysis process using the gluco-amylase enzyme that leads to the overall conversion of starch to glucose to almost 100%. The viscosity reduction of the slurry after the first hydrolysis process ensures proper mixing with the gluco-amylase and prevents the formation of unhydrolyzable gelatinous material in the second hydrolyser. After the second process of hydrolysis, the slurry is decolorizes in an adsorber, CS-1, parked with carbon (Silla 23). After the conversion of starch to glucose the rest of the process dehydrates the glucose. A dry product is then obtained using the process of evaporation. The glucose solution is pumped into the first stage of evaporation where a portion of the water is removed. To conserve energy (heat), the first stage of evaporation uses mechanical re-compression of the vapor evolved and since glucose is heat sensitive the process is conducted in a vacuum produced by a vacuum pump, C-1. The first evaporation stage is carried out in two steps; in the first step, energy is transferred to the solution in the boiler to evaporate some water concentrating the glucose. In the next step vapor and liquid are separated in a phase separator. After the