Abstract
For the high utilization of abundant lignocellulose, which is difficult to directly convert into ethanol, an energy-efficient ethanol production process using acetic acid was examined, and its energy saving performance, economics, and thermodynamic efficiency were compared with the conventional process. The raw ethanol synthesized from acetic acid and hydrogen was fed to the proposed ethanol concentration process. The proposed process utilized an extended divided wall column (DWC), for which the performance was investigated with the HYSYS simulation. The performance improvement of the proposed process includes a 27% saving in heating duty and a 41% reduction in cooling duty. The economics shows a 16% saving in investment cost and a 24% decrease in utility cost over the conventional ethanol concentration process. The exergy analysis shows a 9.6% improvement in thermodynamic efficiency for the proposed process.
Highlights
While ethanol is used in various chemical processes as a raw material, a large demand calls for a new production resource in a large scale and ecofriendly way, and bioethanol fits these requirements
Various feedstock and new energy-efficient processes were explained in recent studies of bioethanol production [2,3,4]
The ethanol process is a typical chemical process system composed of reaction process, acetic acid hydrogenation, separation process, and distillation
Summary
While ethanol is used in various chemical processes as a raw material, a large demand (e.g., automobile fuel) calls for a new production resource in a large scale and ecofriendly way, and bioethanol fits these requirements. The hydrogenation product contains five major can be combined into an extended divided wall column (DWC) to raise the thermodynamic efficiency components—ethanol, acetic acid, water, acetaldehyde and ethyl acetate—which are separated in a for energy saving, as used in many practical applications [19,20], when the column operating pressures series of binary distillation columns, conventionally three columns [18]. The improved process of ethanol production from acetic acid is presented thermodynamic efficiency for energy saving, as used in many practical applications [19,20], when the with simulation inpressures which three columns used conventional method of ethanol columnresults, operating of thedistillation three distillation columns arefor notthe significantly different [21,22,23]. Ethanol concentration, the performances of energy saving, cost reduction, and thermodynamic efficiency improvement are examined
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