Erythritol continuous solventing-out membrane crystallization method

Abstract

The invention relates to an erythritol continuous solventing-out membrane crystallization method. The method comprises feeding an erythritol crystallization mother liquid into a hydrophobic hollow tube membrane module tube-side passage, adding a solventing-out agent through a membrane module shell-side passage, feeding the solventing-out agent into the crystallization mother liquid through passing through a pervaporation ethanol permselective membrane so that the crystallization mother liquid gradually forms supersaturation and precipitates crystals, filtering the crystal slurry separated from the membrane module tube-side passage, carrying out washing and drying to obtain erythritol crystals, feeding the filtrate, washing water and a liquid flowing out of the membrane module shell side into a normal pressure rectifying column together, and feeding the regenerated solventing-out agent at the top of the rectifying column into the membrane module shell-side passage for recycling. The method realizes full continuous production of the erythritol solventing-out crystallization process and effectively prevents the local high over-saturation phenomenon and excessive nucleation phenomenon caused by direct use of a solventing-out agent in the crystallization mother liquor. The solventing-out agent can be recovered and recycled and has the advantages of low production cost, less three waste discharge and energy saving.

Description

technical field [0001] The invention belongs to the technical field of polysaccharide alcohol production, and in particular relates to a method for crystallization of erythritol continuous dissolution film. 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 industrial production of erythritol mainly adopts the fermentation method. After the fermentation liquid is purified, it is first evaporated and concentrated, and then cooled and crystallized to obtain erythritol crystals. Due to the low concentration of erythritol in the fermented liquid, the operating temperature is higher during normal pressure evaporation and concentration, the evaporation of water is larger, and the energy consumption is higher;...

AI Technical Summary

Problems solved by technology

Although the above-mentioned disclosed erythritol dissolution and crystallization method (CN 102992957A) is much lower than the traditional erythritol evaporation crystallization energy consumption, strictly speaking, the method is a batch operation, and when the dissolution agent is directly added to the When in the crystallization mother liquor, the local supersaturation at the adding point of the dissolving agent is very large, and the secondary nucleation phenomenon is serious

In addition, in the erythritol dissolution and crystallization method (CN 102992957A) disclosed above, the dissolution agent does not realize the recovery cycle, and the dissolution agent consumes a lot

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