Continuous oscillatory flow membrane crystallization method of erythritol

Abstract

The invention relates to a continuous oscillatory flow membrane crystallization method of erythritol. The technical scheme is as follows: erythritol crystallization mother liquor is preheated and then sent into a hydrophobic hollow tubular membrane module; by arranging a circular baffle plate in the membrane module and producing oscillatory flow, fluid flowing and micromixing state on the surface of the membrane is remarkably improved, and the technical problem that concentration polarization is easy to happen in the membrane crystallization process or crystals on the membrane surface are easy to deposit and solvent out is effectively solved; water in the crystallization mother liquor entering the membrane module penetrates through the membrane in the form of water vapor and then is drawn out from the other side of the membrane by a vacuum pump and condensed into liquid water; the crystallization mother liquor which leaves the membrane module is concentrated to be saturated and then sent into a crystallizer; erythritol crystals undergo fluidization-suspension for growth; the upper layer of crystallization mother liquor in the crystallizer is pumped into the membrane module for internal circulation; and an erythritol crystallization product is led out of the lower part of the crystallizer. The method of the invention also has advantages as follows: continuous production is realized; and erythritol crystallization production cost can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of polysaccharide alcohol production, and in particular relates to a continuous oscillating flow film 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 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 highe...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the defects of the prior art, and the purpose is to provide a continuous oscillating flow film crystallization method of erythritol, which can effectively alleviate the concentration polarization or gel polarization phenomenon in the crystallization process of the erythritol film, Prevent technical problems such as membrane fouling and membrane flux decline caused by crystal deposition on the membrane surface

Images