High yield method for combined production of crystallized fructose, mannitol and sorbierite

Abstract

The invention discloses a high receiving rate joint crystallizing method of fructose, mannitol and sorbitol, which comprises the following steps: enzymolyzing starch into glucose; transmitting glucose into fructose through glucose isomerase; separating fructose from glucose through analoging mobile bed; obtaining the component with rich fructose and glucose; crystallizing the fructose; transmitting glucose into mannitol under acid condition based on molybdate as catalyst; separating the mannitol from glucose; blending glucose component and glucose mother liquid to saccharify; combining the glucose component; repeating the epimerism reaction; combining the mannitol and crystallized fructose mother liquid; hydrogenating; obtaining the composite alcohol solution with mannitol and sorbitol; crystallizing; refining to obtain the mannitol crystal.

Description

technical field [0001] The invention relates to a preparation method of hexahydric alcohol, in particular to a method for co-producing crystallized fructose, mannitol and sorbitol with high yield by using starch raw material as raw material. Background technique [0002] At present, the industrial method of producing crystalline fructose has the following several according to raw material source: (1) take sucrose as raw material, through hydrolysis, obtain the mixture of fructose and glucose, through adsorption separation, obtain high-purity fructose and glucose, high-purity fructose is passed through Crystallization and separation can obtain crystalline fructose, but the yield of this method is low. (2) The inulin can be 100% converted into fructose by hydrolyzing it. However, the source of inulin is mainly extracted from the fruit of the plant Jerusalem artichoke, and it is difficult to source raw materials for industrial production. (3) Carry out enzymatic conversion of...

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Problems solved by technology

However, the source of inulin is mainly extracted from the fruit of the plant Jerusalem artichoke, and it is difficult to source raw materials for industrial production.

(3) Carry out enzymatic conversion of mannose under the action of mannose isomerase, the conversion rate can reach more than 80%, and then crystallize to obtain crystalline fructose, but the source of mannose is very problematic, and mannose isomerization Enzymes cannot be mass-produced industrially, and industrial production cannot be realized, and this method is not advisable

However, the source of pure mannose is problematic and does not meet the requirements of industrial production

(4) Electrolytic reduction method: glucose can be reduced under electrolytic conditions to generate a mixture of mannitol and sorbitol, and then crystallized and extracted to obtain mannitol. This method has long reaction time, low efficiency, large power consumption, and low yield, only 15 %about

(5) Kelp extraction method: Dried kelp contains 5% to 15% mannitol, which can be extracted by physical crystallization after concentration. The mannitol extracted by this method is of poor quality, difficult to filter, and high heat source, so it is not suitable for It is used in medicine, and this method consumes a lot of steam, energy and manpower, and the production cost is too high

(6) Using glucose as raw material: epimerizing glucose into mannose (the conversion rate is generally 27% to 33%) and hydrogenating invert sugar to obtain a mixture of about 30% mannitol sorbitol, which is crystallized The mannitol product is obtained. This method has an industrialized production device, but the yield is not high, only reaching 24% to 26%.

However, in the methods related to the preparation of crystalline fructose, mannitol and sorbitol in the prior art, there is no report on the method of co-producing crystalline fructose, mannitol and sorbitol with starch raw material as raw material with high yield