Enzymatic secondary cycle injection liquefaction process and liquefaction system

Abstract

The invention discloses an enzymatic secondary cycle injection liquefaction process and a liquefaction system, which changes the installation position of the second liquefaction injector in the traditional liquefaction system, and after the first injection liquefaction, the second injection liquefaction device directly extracts the material The feed liquid in the liquid recovery tank is sprayed and liquefied in the second cycle, and the feed liquid sprayed by the second liquefaction injector and the feed liquid sprayed by the first liquefaction injector are sent into the flash tank at the same time for flash mixing and dethickening, and then Send it into the feed liquid recovery tank for secondary enzyme mixing operation, until the liquid level in the feed liquid recovery tank reaches the set value, then pump the feed liquid in the feed liquid recovery tank into the laminar flow tank for heat preservation, at this time the feed liquid The liquid part of the feed liquid in the recovery tank is clear and transparent, while the protein is separated and condensed intact and floats on the surface of the liquefied liquid, which greatly improves the liquefaction efficiency of starch.

Description

technical field [0001] The invention relates to the technical field of starch sugar production, in particular to an enzymatic secondary cycle injection liquefaction process and a liquefaction system. Background technique [0002] Glucose production by enzymatic hydrolysis can be divided into two steps: the first step is to use liquefying enzymes to hydrolyze gelatinized starch into dextrin and oligosaccharides, etc., to reduce viscosity and increase fluidity, so it is called liquefaction in industry; the second step is to use Glucoamylase further hydrolyzes dextrin or oligosaccharides into glucose, which is called saccharification in production. [0003] The common liquefaction process is the secondary injection liquefaction method. The process is to adjust the pH value after mixing the starch milk, add enzyme preparations and stir evenly, then send it to the first liquefaction injector for one injection, and the injected material liquid enters the A flash evaporation is ca...

AI Technical Summary

Problems solved by technology

Because the feed liquid recovered by the first spray flash evaporation is basically pasty, although adding enzyme preparation in the feed liquid recovery tank can reduce the viscosity of the paste after stirring, but still entraining a large amount of Unliquefied starch granules and agglomerated granules lead to low heat preservation and liquefaction efficiency in subsequent laminar flow tanks, which increases the difficulty of decomposing insoluble particles in the terminal secondary spraying

In order to improve the efficiency of the secondary injection, the temperature of the secondary injection must be increased to 145°C. This will not only cause waste of steam energy, but also cause unqualified liquefied liquid due to improper operation. The blue color of iodine reaction indicates that there is unhydrolyzed liquefied liquid in the liquefied liquid. The presence of starch causes difficulties in the post-saccharification section and increases the difficulty of filtration. The final product produced is easy to be turbid and has a short shelf life.

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