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Membrane and Desalination Technologies - TCE Moodle Website

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Treatment of Food Industry Foods <strong>and</strong> Wastes by <strong>Membrane</strong> Filtration 263<br />

Water,<br />

Distillers<br />

Byproduct<br />

Steam,<br />

Agitation<br />

Heat<br />

CO2 Heat<br />

Water<br />

190 Proof Ethanol<br />

Grain Conditioning<br />

Cooking<br />

Cooling<br />

Fermentation<br />

Heat Stripping Column Distilling (Beer) Column<br />

50% Ethanol<br />

Refining Column Heat<br />

Denaturing<br />

Screen <strong>and</strong> Press<br />

Denaturing Chemical<br />

sugars using an acid hydrolysis pretreatment process, before it is fed into the fermentation<br />

reactor.<br />

The ethanol produced from fermentation (Fig. 6.23) can then be screened, pressed,<br />

stripped, distilled, <strong>and</strong> refined for the production of 190-Proof ethanol. Pure alcohol is<br />

100% or 200-Proof. The 190-Proof product contains 95% alcohol <strong>and</strong> 5% water. The ethanol<br />

can be used as either a beverage or a fuel (8).<br />

In comparison with other fuels, the 200-Proof ethanol’s heat value is rated at 84,000 BTU/<br />

gallon, which is higher than the 200-Proof methanol (60,000 BTU/gallon), but lower than<br />

gasoline (120,000 BTU/gallon) <strong>and</strong> diesel fuel (140,000 BTU/gallon). It should be noted that<br />

methanol can only be produced by synthesis from coal, natural gas, or wood, but not by<br />

fermentation (8).<br />

New advances in genetic engineering <strong>and</strong> membrane technology have vastly improved the<br />

productivity of fermentation processes, which could possibly tip the balance in favor of<br />

Or<br />

Water, Enzyme,<br />

Acid or Alkali<br />

Water<br />

Acid,Yeast<br />

Enzyme<br />

Fig. 6.23. Fermentation process for ethanol production.<br />

Heat<br />

Water

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