Fermentation: Uses renewable resources: sugar beet or sugar cane, corn and other starchy materials, Batch process: everything is mixed together in rxn vessell and then left for several days. Batch is removed and a new rxn is set up., Inefficient Process, SLOW, taking several days, produces impure ethanol which needs further processing, uses gentle temperatures and atmopsheric pressure, Hydration of Ethene: uses FINITE/nonrenewable resources: once all oil is consumed, there is no more, a continuous flow process: stream of reactant is constantly pass over a catalyst, Efficient process, QUICK / FAST, produces purer ethanol, uses HIGH temps and pressure, requiring a lot of energy,

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