The invention discloses a
distillation dehydration device and a
distillation dehydration process for co-producing
ethanol fuels and custom grade edible alcohols. The device comprises a
molecular sieve adsorption /
desorption tower, a coarse fractionating
tower, an assembled
tower, a rectifying tower, a
methanol tower and mash pre-heaters, wherein the
wine steam of the assembled tower, after compressed by an
ethanol steam compressor, is used as the heat sources and
raw material wine steams of the coarse fractionating tower and the
methanol tower; the
wine steam of the rectifying tower is used asthe heat source of the assembled tower; and the wine steam of the coarse fractionating tower, the
anhydrous alcohol steam and the wine steam of the
methanol tower are respectively used as the heat sources of the first, second and third mash pre-heaters. The device can simultaneously produce
ethanol fuels and custom gradeedible alcohols, and can separately produce ethanol fuels or custom grade edible alcohols. The device and the process of the invention have the advantages that, because a multi-effect
energy coupling mode is adopted, compared with an original process, the
energy consumption ofthe process of the invention is greatly reduced, and the steam consumption of the
ethanol fuel per metric
ton is reduced to 1.1 to 1.5 t / t, compared with the steam consumption of 1.5 to 2.0 t / t in the original process, the steam consumption is down by 25 to 35 percent without consuming high-grade steams (more than 0.7 MPag); and the steam consumption of the custom grade edible
alcohol per metric
ton is reduced to 1.2 to 1.4 t / t, compared with the steam consumption of 1.9 to 2.5 t / t in the original process, the steam consumption is down by 35 to 50 percent.