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Cellulosic ethanol distilling method

A technology of cellulosic ethanol and ethanol vapor, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of large differences in fermented mash components and inapplicability to cellulosic ethanol, etc.

Active Publication Date: 2017-07-07
COFCO NUTRITION & HEALTH RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the large differences in the components of fermented mash formed by different raw materials, the traditional ethanol distillation process for corn ethanol or cassava ethanol is not suitable for cellulosic ethanol. Therefore, it is necessary to develop a method suitable for cellulosic ethanol distillation

Method used

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  • Cellulosic ethanol distilling method

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Embodiment approach

[0044] According to a preferred embodiment of the present invention, the distillation conditions of the first distillation tower 1 include: the number of trays is 16-18, the temperature at the top of the tower is 63-65°C, and the pressure at the top of the tower is -0.045 to -0.04 Mpa, the temperature of the tower kettle is 83-85°C, and the pressure of the tower kettle is -0.055 to -0.05Mpa.

[0045] More preferably, the distillation conditions of the first distillation tower 1 include: the number of trays is 16-18, the tray form is a floating valve, the tray efficiency is 45-55%, and the tray spacing is 0.5-0.6 meters, The reflux ratio is 1.8-2.

[0046] In the present invention, the content of ethanol in the first ethanol vapor may be 35-40% by weight.

[0047] In the present invention, the first ethanol vapor passes through the condenser 9 of the first distillation column to form ethanol condensate, and the condensation conditions can be selected conventionally in the field,...

Embodiment 1

[0068] This example is used to illustrate the method for distilling cellulose ethanol provided by the present invention.

[0069] In this example, the fermented mash is the fermented mash obtained by pretreatment, enzymolysis and fermentation of corn stalks. The content of each component in the fermented mash is: ethanol 5.4% by weight, water 76.6% by weight, acids 1.55% by weight, residual sugar 2.9% by weight, solid content 13% by weight, glycerin 0.75%. This example is in figure 1 in the device shown.

[0070] Such as figure 1 As shown, the fermented mash A exchanges heat with the material extracted from the bottom of the first distillation tower 1 in the feed heat exchanger 6 to obtain the heated fermented mash. The temperature of the fermented mash before the heat exchange is 30 ℃, the temperature of the fermented mash after heating is 63 ℃. The heated fermented mash enters the first distillation tower 1. The heated fermented mash is mass-transferred on the tray of t...

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Abstract

The invention relates to the field of cellulosic ethanol purification, and discloses a cellulosic ethanol distilling method. The method includes steps of delivering the heated fermenting mash to a first distilling tower to distill, extracting first ethanol steam from the tower roof, and extracting a first ethanol mixture from the side line of the first distilling tower; condensing the first ethanol steam extracted from the tower roof and forming ethanol condensate; back-flowing a part of ethanol condensate, and delivering the other part of ethanol condensate to a third distilling tower to distill; delivering the first ethanol mixture extracted from the side line of the first distilling tower to a second distilling tower to distill; extracting the second ethanol steam from the second distilling tower roof, delivering a part of second ethanol steam to a third distilling tower to distill, and dewatering the other part of second ethanol steam. The method provided by the invention can effectively recycle cellulosic ethanol with high purity and high yield from the fermented mash of the cellulosic ethanol.

Description

technical field [0001] The invention relates to the field of cellulose ethanol purification, in particular to a method for distilling cellulose ethanol. Background technique [0002] Energy and environmental issues are issues that must be resolved to achieve sustainable development. In the long run, the shortage of liquid fuel will be a big problem that plagues human development. Against this background, biomass is gaining increasing attention as the only renewable resource that can be converted into liquid fuels. Therefore, the technology of producing liquid fuel from biomass has great development prospects, and the technology of producing fuel ethanol from biomass has attracted much attention. Existing industrialized fuel ethanol production uses sugar or grain as raw material. The advantage is that the process is mature, but the output is limited by the raw material, so it is difficult to meet the energy demand for a long time. [0003] In the long run, the production o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C31/08
CPCC07C29/80C07C31/08
Inventor 杨宇平冯楠范红岩谭月春袁敬伟商成祥孙岩孙海龙林海龙武国庆
Owner COFCO NUTRITION & HEALTH RES INST
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