In the first distillation tower,ethanol is concentrated up to 45%
w/w,and heavy alcohols are separated and sent to the recuperation
tower for condensation.In the rectifying tower,ethanol is
concentrated up to 96%w/w,and aldehydes are separated.The
energy is recovered because the water used as condensate agent is
added in the hydrolysis in order to dilute the H2SO4, conducting to
energy plant integration.