Process for producing ethanol from potato residue

Abstract

The invention discloses an ethanol production method that utilizes potato pulp and is characterized by comprising the steps: impurity removal of a raw material of potato pulp, addition of a liquefying enzyme, aging and liquefying under microwave heat, dual-enzymatic saccharification, fermentation, vacuum filtration of a fermented fluid, vacuum pressure-reduced distillation and molecular sieve dehydration, thus obtaining 99.5% finished ethanol product, which is then stored at normal temperature. For the raw materials of potato pulp, which contains ingredients of cellulose and starch and the like, firstly the ethanol production method is utilized and microwave is used for aging and liquefying the starch contained in the raw materials of potato pulp, which are added with liquefying enzyme; then maltogenic amylase and cellulose are added for continuing saccharification; immobilized yeast is used for fermenting sugar ingredients; pulp is removed by vacuum filtration; low-concentration ethanol is distillated through pressure-reduced vacuum distillation and the 99.5% ethanol is prepared through molecular sieve dehydration, and finally the ethanol stored at normal temperature in sealed environment. The ethanol production method leads the raw material of potato pulp to be liquefied at the temperature of 70 to 85 DEG C, saccharified by dual enzymes at the temperature of 58 to 62 DEG C,fermented at the temperature of 28 to 32 DEG C, vacuum filtered and distilled in pressure-reduced vacuum, thus maximizing the utilization of the potato pulp ingredients in the ethanol production, andthe ethanol production method is characterized by energy-saving effect, quickness and high yield, and can be widely applied into the ethanol production with various materials of potato pulp that contain cellulose and starch ingredients.

Description

technical field [0001] The invention relates to a method for producing ethanol from potato dregs, in particular to a method for producing ethanol from plants (containing components such as cellulose and starch), and belongs to the category of repeated utilization of biological resources. Background technique [0002] Fermented alcohol (ethanol) in my country is mostly produced from starchy raw materials. The production of alcohol from starchy raw materials is divided into raw material pretreatment, raw material cooking, saccharification agent preparation, saccharification, distiller's preparation, ethanol fermentation and distillation. At present, the continuous cooking process is widely used in various alcohol factories in my country, and methods such as tank (pot type) continuous cooking and tower (column) continuous cooking are commonly used. After absorbing water, the starchy raw materials are continuously cooked under high temperature and high pressure (temperature 126-...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the cooking time is longer, the temperature is high, and there is sugar loss in the cooking process.

The disadvantage of the above method is that traditional alcohol production uses high temperature and high pressure cooking at 120-130°C to dissolve and release starch granules. This process consumes a large amount of water vapor and its energy consumption accounts for about 30% of the total energy consumption of the entire production. On the other hand, high-temperature cooking can easily convert fructose in raw materials into caramel. Caramel can not only make yeast ferment, but also hinder the action of glucoamylase on starch, affecting yeast growth and alcohol production. Starch loss can reach 1.2% to 1.5% %

The disadvantage of this method is that the liquefaction time is very long, reaching 3.5-4 hours, adding H 2 SO 4 The acidification of the feed liquid will seriously corrode the equipment

The disadvantage of this method is that the gelatinization time is as long as 120min, the gelatinization temperature is 100°C higher, and the fermentation temperature is 36-40°C higher

The disadvantage of this method is that the saccharification and fermentation time is 9 days, and the yeast treated with glutaraldehyde solution cannot be used for the fermentation and production of food-grade ethanol

The disadvantage of this method is that 0.5% H2SO4 needs to be added for dilute acid pretreatment of hemicellulose, the amount of acid added is large, the equipment is easily corroded by acid, and a large amount of alkali needs to be added to neutralize the acid, which increases the salt content in the solution

The fiber is treated under high temperature and high pressure at 121°C for 1 hour, which consumes a lot of energy, requires high equipment and costs