Energy integration method for producing ethyl alcohol through acetic acid esterification and hydrogenation

The invention relates to an energy integration method for producing ethyl alcohol through acetic acid esterification and hydrogenation, mainly solving the problem of high energy consumption in the prior art. The energy integration method includes: (1), performing heat exchange between ethyl alcohol and acetic acid material flows and ethyl alcohol product tower top material flows; (2), performing heat exchange between the preheated ethyl alcohol and acetic acid material flows and refining tower top material flows; (3), performing heat exchange between the ethyl alcohol and acetic acid material flows subjected to two-time preheating and hydrogenation reactor outlet material flows, and enabling the ethyl alcohol and acetic acid material flows to enter an esterification reaction kettle to obtain acetic ether; (4), mixing raw hydrogen with the acetic ether, performing heat exchange between the raw hydrogen and the hydrogenation reactor outlet material flows, enabling the raw hydrogen to enter a hydrogenation reactor, and enabling the raw hydrogen to contact and react with copper-bearing catalysts to obtain ethyl-alcohol-bearing material flows to further obtain an ethyl alcohol product . The energy integration method well solves the problem and can be applied to ethyl alcohol production based on acetic acid esterification and hydrogenation.