A kind of low energy consumption polydextrose preparation method

Abstract

The invention discloses a method for preparing polydextrose with low energy consumption, which comprises the following steps: dissolving glucose in hot water, then adding sorbitol and citric acid, stirring evenly, heating and dissolving with process water after mixing to obtain a solution; and then The upper part of the scraper evaporator is evaporated, and the lower part is subjected to condensation reaction. After the reaction is completed, the material is discharged. The rotor pump is used to spray the molten reaction material into the process water, and then the discharge valve is opened, and the mixed solution is put into the decolorization front. decolorization in the tank; further ion exchange and membrane separation to finally obtain polydextrose with a content greater than or equal to 90%. The invention uses a rotor pump to transport the molten condensate to the nozzle and sprays it into the water, which solves the problem of slow dissolution; and sprays the hot reactant into the water, and the heat flow of the reactant is directly diffused into the water , which not only saves time but also saves the heat required to melt and cool the bulk reactants, and the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of polydextrose preparation, in particular to a low-energy-consumption polydextrose preparation method. Background technique [0002] Polydextrose (Polydextrose, also known as polydextrin) is a kind of water-soluble dietary fiber, which is a white or off-white powdery solid, odorless, and easily soluble in water. It is a polymer formed by polymerization at high temperature and low pressure. Its chemical formula is a polycondensate of random bonding of glucose, but D-glucose polymer is mainly composed of 1,6-glycosidic bonds, combined with a small amount of sorbitol, citric acid, etc. , the average molecular weight is greater than 3200, and the average degree of polymerization is greater than 20. [0003] The existing polydextrose is formed by the polycondensation reaction of glucose, sorbitol and citric acid under the conditions of high temperature and high vacuum, and the reaction material in the molten st...

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Problems solved by technology

[0003] Existing polydextrose is formed by polycondensation reaction of glucose, sorbitol and citric acid under high temperature and high vacuum conditions, and the molten reaction material after polycondensation is directly put into water, causing the reaction material to cool down sharply and solidify. Almost into one piece, it needs to be heated again to dissolve; and in the existing production technology, a tank reactor is used for production, and the process is feed-evaporation-condensation reaction-adding water to dissolve-discharging, these four processes are carried out one by one, the first The second process can only be carried out after the first process is completed. Although it is very compact, it is not only time-consuming but also steam-consuming to follow the steps step by step. Due to the negative pressure evaporation and condensation reaction in the reaction process, there are many bubbles. , which increases the volume of the reaction solution, which limits the amount of feed in terms of volume. The above two points lead to long reaction time and low throughput, which is not suitable for large-scale industrial production.

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