Method for preparing ethyl alcohol

Abstract

The invention provides a method for preparing ethyl alcohol. The method is characterized by including the steps that starch raw materials are smashed to form large-particle starchiness raw materials; water and thermostable amylase are added into the large-particle starchiness raw materials to be mixed and stirred to form a first mash; gelatinization processing is carried out on the first mash to form a second mash; liquefaction processing is carried out; saccharification processing is carried out on the liquefied second mash to form a third mash; and the third mash is fermented. According to the method, under the condition that the large-particle starchiness raw materials can be used, the viscosity of the mashes of the starchiness raw materials is controlled to be within the technology acceptable range. Meanwhile, as the viscosity and the liquefied saccharification effect of the mashes of the starchiness raw materials are well controlled, the problems of difficult conveying and incomplete liquefied saccharification in the prior art when the mashes of the starchiness raw materials are used for producing the ethyl alcohol are solved, and the energy consumption in the production technology is further reduced.

Description

technical field [0001] The present invention generally relates to the field of ethanol preparation, and more specifically, relates to a method for preparing ethanol. Background technique [0002] In the process of ethanol production, saving energy and reducing consumption has become the main theme to promote the development of the industry. Among them, the concentrated mash fermentation process has the most obvious effect on energy saving and consumption reduction in ethanol production. One of the prerequisites for the realization of thick mash fermentation technology is to increase the content of fermentable sugar in the fermented mash, that is, to increase the concentration of starch content in the mash after mixing the crushed starchy raw materials with water, and to pass a certain amount of time. Process operation control to prepare saccharified mash with high starch content, so that the concentration of fermentable sugar in the fermented mash can be effectively increas...

AI Technical Summary

Problems solved by technology

[0004] However, there are very few studies on how to prepare high-concentration qualified saccharified mash and then high-concentration ethanol through large-grain dry starchy raw material mash, and no related reports have been seen so far.

[0005] In the prior art, the ethanol concentration in the mature fermented mash of ethanol production enterprises is usually about 11% (v), which is converted into a ratio of about 1:2.8 between the pulverized raw material and the mixing water, and the ethanol concentration in the fermented mature mash cannot reach 1:2.8. 14% (v) or higher process requirements for ethanol fermentation of thick mash (converted into a ratio of about 1:2 between crushed raw materials and mixing water), to increase the starch content in mash after crushing raw materials and mixing materials, in general raw materials When the diameter of the crushed particles is less than 1.2mm, the easiest way is to reduce the amount of mixing water added, but only by reducing the amount of mixing water will have the following problems: due to the increase in the amount of crushed raw materials in the mash, Although it will increase the starch content in the mash, as the temperature of the mash rises, the viscosity of the mash will increase significantly, which will bring difficulties to the transportation of the mash and increase the power consumption during the transportation process. Sometimes it will affect the transportation of mash due to the increase of the viscosity of mash, and even cause difficulties in transportation of mash, which directly affects the normal operation of production

However, a new problem has emerged. Due to the increase in the crushed particle size of starchy raw materials, after mixing with mixing water, the water absorption speed of large-grained starch will slow down, which will directly affect the effect of liquefaction and saccharification, and then affect ethanol. The effect of fermentation and the utilization effect of raw materials

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