Process for directly producing high-quality sorbitol by taking starch as raw material

Abstract

The invention discloses a process for directly producing high-quality sorbitol by taking starch as a raw material. The process comprises the following steps: by taking the starch as the raw material, performing size mixing, liquefaction, saccharification, decoloration, ion exchange and chromatographic separation to collect glucose liquid fraction; then, performing continuous hydrogenation on the glucose liquid fraction by evaporating and concentrating to convert a glucose liquid into a sorbitol liquid; finally, refining, concentrating, mixing and crystallizing, crushing and drying the sorbitol liquid, so as to obtain the high-quality sorbitol, wherein process water is added into starch to perform size mixing, baume degree of the starch milk subjected to the size mixing is 15-20 and the pH value of the starch milk is 4.0-6.0; during liquefaction, the addition amount of liquifying enzyme is 0.30-0.40kg / t dry starch, a spray temperature ranges from 105 DEG C to 145 DEG C and a liquefaction pH value is 5.0-6.0; during saccharification, the addition amount of saccharifying enzyme is 0.35-0.45kg / t dry base, the temperature is kept with intermittent agitation for not less than 48 hours at 50-70 DEG C; during the chromatographic separation, a simulated moving bed chromatographic separation system is adopted, water is taken as an eluent, the separation temperature is controlled to range from 40 DEG C to 80 DEG C, and separation pressure is 0.2 Mpa to 0.5 Mpa. According to the process for directly producing high-quality sorbitol by taking starch as the raw material, the product quality is improved, the production process is simplified, the production efficiency is improved and the production consumption is reduced.

Description

technical field [0001] The invention relates to a process for directly producing high-quality sorbitol by using starch as a raw material, and belongs to the technical field of functional sugar alcohol production. Background technique [0002] Sorbitol is a sugar alcohol with good taste produced from starch, sucrose or glucose. The sweetness is about 60% of that of sucrose. Sorbitol enters the human body to metabolize. It is a nutritional sweetener, but its metabolic pathway First, it diffuses slowly to be absorbed, oxidizes fructose, and then uses it to participate in the fructose metabolism pathway, which has no effect on blood sugar and urine sugar. [0003] In the traditional sorbitol production process, it is necessary to saccharify, refine, and crystallize starch into glucose crystals to achieve a certain purity, then dissolve the crystalline glucose to prepare a glucose solution of a certain concentration, and finally hydrogenate it to reduce it to sorbitol. The purit...

AI Technical Summary

Problems solved by technology

The purity of glucose after traditional cooling and crystallization is about 99%. Glucose enters the autoclave to be hydrogenated and reduced to sorbitol through the sugar conversion process. The organic impurities in the sugar liquid are also brought into the product sorbitol during this process, which affects the finished product of sorbitol. purity and performance

Therefore, the traditional sorbitol production has many problems such as long process flow, high consumption of water, electricity, steam and other auxiliary materials, low production efficiency, low raw material utilization rate, and many sorbitol impurities.

[0004] The patent "A method for extracting high-purity glucose from saccharified glucose syrup" (CN1928121A) discloses a method for purifying glucose using a simulated moving bed. The chromatographic separation uses a system pressure of 0.9-1.2Mpa. High system pressure will cause great damage to the stationary phase calcium-type cation exchange resin. In addition, high pressure will cause high energy consumption of the system; the stationary phase of the chromatographic separation system uses calcium-type cations as adsorbents. , its volume will shrink and expand, causing damage to the resin; at the same time, due to the high water content in the resin, it cannot withstand drying and freezing, otherwise it will cause permanent damage, so it also limits the use area and scope of this process

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