Energy-saving and clean production method of fuel ethanol

A technology for fuel ethanol and cleaner production, which is applied in the fields of biofuels, climate sustainability, fermentation, etc., and can solve the problems of high discharge of process wastewater, difficulty in achieving cleaner production, and unstable acidity indicators.

Active Publication Date: 2020-08-28
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main energy consumption of the mainstream production technology of fuel ethanol products is reflected in the rectification and dehydration unit, clean production is reflected in the impact of waste water discharge on the environment from the waste mash treatment unit, and the steam consumption of the rectification and dehydration unit that produces 1 ton of fuel ethanol products ≥1.6 tons; the discharge process wastewater of 1 ton of fuel ethanol products is ≥3 tons, the discharge of process wastewater is relatively high, and it is difficult to achieve clean production; in addition, the acidity index of fuel ethanol products is not stable and often exceeds the standard, usually need to add organic alkali or Inorganic base for regulation
These have affected the promotion and use of fuel ethanol and restricted the sustainable and healthy development of the industry

Method used

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  • Energy-saving and clean production method of fuel ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Using cassava as raw material to produce denatured fuel ethanol products that meet GB 18350-2013, the production process includes mash preparation unit, rectification dehydration unit, and waste mash treatment unit, see e.g. figure 1 , image 3 , Figure 4 . Specific steps are as follows:

[0098] 1. Mash preparation unit

[0099] First, the cassava raw material is sent to a pulverizer for crushing, and the crushed powder is sent to the pre-liquefaction tank, and at the same time, the mixing water is added to the pre-liquefaction tank, and the mixing water includes the evaporative condensation of the multi-effect evaporator of the waste mash processing unit. Water, the water in the first refining tower and the washing water of the carbon dioxide scrubber, and auxiliary materials such as amylase are added to the flow, and the temperature of the mixing material in the pre-liquefaction tank is controlled by introducing fresh steam.

[0100] The liquefied mash in the pr...

Embodiment 2

[0117] Using molasses as a raw material to produce denatured fuel ethanol products that meet GB 18350-2013, the production process includes a mash preparation unit, a rectification dehydration unit, and a waste mash treatment unit, see e.g. figure 2 , image 3 , Figure 5 . Specific steps are as follows:

[0118] 1. Mash preparation unit

[0119] For sugary raw materials, after acidification, impurity removal and dilution, the saccharification mash is directly obtained, and part of the saccharification mash is directly sent to the distiller's expansion tank, and part is sent to the fermentation tank. Water, the water in the first rectifying tower kettle of the rectification dehydration unit and the washing water in the tower kettle of the carbon dioxide scrubber.

[0120] The yeast is also sent to the expansion tank, and an appropriate amount of sterile air is continuously introduced into the tank, and the cultivation is carried out at the expansion temperature of 28°C. A...

Embodiment 3

[0135] Using corn as raw material to produce denatured fuel ethanol products meeting GB 18350-2013, the production process includes mash preparation unit, rectification dehydration unit, waste mash treatment unit, see for example figure 1 , image 3 , Figure 4 . Specific steps are as follows:

[0136] 1. Mash preparation unit

[0137]First, the corn is sent to the pulverizer for crushing, and the crushed powder is sent to the pre-liquefaction tank, and at the same time, the mixing water is added to the pre-liquefaction tank. The water in the refining tower and the washing water of the carbon dioxide scrubber, and auxiliary materials such as amylase are added, and the temperature of the mixing material in the pre-liquefaction tank is controlled by introducing fresh steam.

[0138] The liquefied mash in the pre-liquefaction tank is mechanically pumped to the jet liquefier, and the jet liquefier controls the temperature of the material at the outlet of the injector by contro...

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Abstract

The invention discloses an energy-saving and clean fuel ethanol production method. According to the energy-saving and clean fuel ethanol production method, a production process comprises a mash preparation unit, a distillation and dehydration unit and a mash waste processing unit; heating steam of a first distillation tower reboiler of the distillation and dehydration unit is fresh steam, and exhausted steam condensate is collected and conveyed to a first distillation tower column to directly heat tower bottoms. By means of the techniques of multi-stage multi-effect utilization of steam, side-draw impurity removal, two-stage desorption and regeneration, tail gas impurity removal via liquefaction and flashing, process wastewater recycling and the like, steam consumed for producing 1 ton of fuel ethanol products is less than or equal to 1.3 tons, and the acidity index of the fuel ethanol products is less than or equal to 40 mg / L, so that energy and material consumption during fuel ethanol production can be effectively reduced, clean production with zero emission of industrial wastewater can be achieved, the industrial problem that the acidity index of fuel ethanol products is instable and fails to meet the of GB18350-2013 denatured fuel ethanol standard requirements, and the marketing competitiveness of biofuel ethanol can be improved. The energy-saving and clean fuel ethanol production method belongs to the technical field of renewable clean energy technology.

Description

technical field [0001] The invention relates to an energy-saving and clean production method of fuel ethanol, which can effectively reduce energy consumption in the production process of bioethanol, realize a clean production process of zero discharge of process wastewater, and solve the problem of unstable acidity index of fuel ethanol products, which cannot meet GB18350-2013 Denatured fuel ethanol standard requirements and other industry problems, improve the market competitiveness of biofuel ethanol, belongs to the technical field of renewable clean energy technology. Background technique [0002] Fuel ethanol produced by fermentation has similar combustion properties to fossil fuels, and its production raw materials are biological sources, which is a renewable energy source. In addition, the emissions of carbon monoxide and sulfur-containing gases during the combustion of ethanol are lower than those of gasoline combustion, and the amount of carbon dioxide produced is ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/10
CPCC12P7/10Y02E50/10Y02P20/10
Inventor 张敏华李永辉耿中峰时锋付存亭刘成欧阳胜利董秀芹吕惠生
Owner TIANJIN UNIV
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