Continuous oscillation flow pipe type cooling crystallization method of erythritol

Abstract

The invention relates to a continuous oscillation flow pipe type cooling crystallization method of erythritol. The technical scheme is as follows: feeding erythritol crystallization mother liquor into a multi-stage serial sleeve type crystallizer, and axially arranging a circular damper along a center in each sleeve, axially reciprocating and oscillating along the center in the tube through the circular damper, thereby obviously improving the fluid flowing and micromixing state near the continuous sleeve type crystallizer pipe wall, and enabling the crystal particles in the crystallization mother liquor to uniformly suspend; the plug flow type RTE (retention time distribution) can be approximately achieved even under low flow velocity, and the inherent chronic disease restricting the traditional tubular continuous crystallizer industrial application is effectively solved, such as the following technical problems that the heat transfer efficiency is obviously lowered since the crystallizer wall is easy to deposit / separate the crystal to form the crystal scale, the radial temperature-concentration gradient is larger, and the local oversaturation is higher since a pipe wall retention layer is thick under the low shearing rate. The method disclosed by the invention has the advantages of being continuous in production, capable of effectively lowering the crystallization production cost of the erythritol.

Description

technical field [0001] The invention belongs to the technical field of polysaccharide alcohol production, and in particular relates to a continuous oscillating flow tube cooling crystallization method for erythritol. Background technique [0002] Erythritol is a natural sugar and functional sweetener. It is widely used in the development of low-calorie health food, functional food or beverage for people with diabetes and glucose discomfort, and children's special tooth cleaning products. The market prospect is very promising. [0003] The production process of erythritol mainly includes chemical synthesis and fermentation. Finally, crystallization and separation technology is required to obtain erythritol products. At present, the crystallization process of erythritol production is mainly batch crystallization operations, such as evaporation crystallization, cooling crystallization and elution crystallization. Compared with the batch crystallization process, continuous crys...

AI Technical Summary

Problems solved by technology

Although the MSMPR crystallizer is widely used in the current continuous crystallization process (both laboratory and industrial scale) due to its advantages of simple structure and convenient operation, it also has the following disadvantages: poor microscopic mixing leads to local high shear areas and local Severe supersaturation (secondary nucleation, crystal crushing, etc.); transportation of solid materials on continuous production lines; nonlinearity in industrial amplification processes and other disadvantages

[0005] However, when the tubular crystallizer is used in the continuous cooling and crystallization process, due to the large temperature difference at the heat exchange tube wall, the phenomenon that crystals are easy to deposit and precipitate on the tube wall is very serious, and even the tubular crystallizer may be blocked.

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