CN102249855A - Process for preparing erythritol - Google Patents

Abstract

A process for preparing erythritol, which belongs to the technical field of functional sugar production. The process uses activated carbon decolorization technology, special activated carbon for deproteinization and small molecule removal, and anion and cation exchange resins to refine and purify the fermentation broth. The process steps include: ( 1) Dialysate preparation, (2) decolorization, (3) deodorization, (4) purification, (5) evaporation, (6) crystallization, (7) crystallization, separation, and drying to obtain crystalline erythritol. The invention shortens the production cycle, improves the work efficiency; reduces the consumption of steam and electricity in the production, and reduces the production cost; Yield and product quality can improve the quality and reusability of the mother liquor after separation, and reduce production costs.

Description

A kind of preparation technology of erythritol

technical field

The invention belongs to the technical field of functional sugar production, and in particular relates to a process for refining and crystallizing erythritol fermentation liquid.

Background technique

Erythritol is a non-caloric four-carbon polysaccharide with a sweetness of 60-80% of sucrose. Erythritol has been used in low-sugar, health-care and other functional foods in recent years due to its superior characteristics such as low energy value, high tolerance, no toxic side effects, edible for diabetics and non-cariogenic properties. At present, the industrial preparation method of erythritol is mainly microbial fermentation method. Its production method uses glucose as raw material to obtain erythritol fermentation liquid by fermentation of hyperosmotic yeast, and the fermentation liquid is filtered by ceramic membrane or plate filter. Yeast is removed, then concentrated by evaporation and crystallized to obtain crude crystals of erythritol, and then the crude crystals are dissolved in fresh water, decolorized by activated carbon, purified by ion exchange resin, evaporated, crystallized, and separated to obtain finished erythritol. At present, this production method requires two crystallizations to obtain the finished erythritol, which has a long production cycle and large steam consumption; and the erythritol fermentation liquid is directly evaporated and concentrated without refining and purifying after the yeast is removed, crystallized, and crystallized. The yield is low, the crystallization mother liquor is dark in color and high in viscosity, and cannot be reused, resulting in a low overall yield of no more than 75%.

Contents of the invention

The present invention aims to provide a preparation process of erythritol to solve the problems of complex preparation process, long production cycle, large steam consumption, low yield and low crystallization mother liquor in the prior art, which has deep color, high viscosity and cannot be reused.

The technical solution adopted by the present invention to solve its technical problems is to use activated carbon decolorization technology, special activated carbon and anion-cation exchange resin for deproteinization and removal of small molecular substances to refine and purify the fermented liquid, which can remove the pigment, erythritol fermented liquid, Impurities such as proteins, colloids, anions, and cations make it possible to obtain finished erythritol through one-time crystallization of the thiritol fermentation broth. Its process steps are as follows:

1. Preparation of dialysate: use glucose as raw material, ferment the fermented liquid with hyperosmotic yeast, filter through ceramic membrane to remove yeast, and obtain dialysate;

2. Decolorization: the dialysate is decolorized by adding ordinary sugar alcohols at 0.1%~1% (w/v) and activated carbon at 40°C~75°C. The decolorization time is 20min~80min, and the decolorization solution is obtained by filtration and separation;

3. Deodorization: Add 0.02%~0.1% (w/v) special activated carbon for deproteinization and removal of small molecular substances to the primary decolorization solution at 40°C~75°C to remove small molecular substances such as protein and color prerequisites , the decolorization time is 20min~80min, and the secondary decolorization solution is obtained by filtration and separation;

4. Purification: The secondary decolorization solution is ion-exchanged according to the process flow of Yin-Yang-Yin, and the erythritol feed liquid is further refined and purified. It is required that the light transmittance of the feed liquid after ion exchange is ≥99.8%, and the conductivity is ≤ 10μs/cm;

5. Evaporation: Evaporate and concentrate the erythritol feed solution to a refractive concentration of 55%~75%;

6. Crystallization: Erythritol crystallization adopts gradient cooling crystallization, the initial temperature is 65°C~75°C, and the cooling rate is 0.5°C~10°C/hr;

7. Separation and drying: the crystalline massecuite is separated and dried by a centrifuge to obtain crystalline erythritol.

All ion exchange resins can be used for the anion and cation resins referred to in the above 4.

The beneficial effects of the present invention are: the production cycle is shortened, which is conducive to improving work efficiency; the consumption of steam and electricity in production is reduced, which is conducive to reducing production costs; The impurities are beneficial to increase the crystallization yield and product quality. In addition, it can improve the quality of the separated mother liquor and improve its reusability, which is of great help to reduce production costs.

Detailed ways

The preferred embodiment of the present invention is to use active carbon decolorization technology, special active carbon and anion and cation exchange resin for deproteinization and removal of small molecular substances to refine and purify the fermented liquid, and the specific process steps are as follows:

1. Using glucose as raw material, the fermented liquid obtained by fermenting hyperosmotic yeast is filtered through a ceramic membrane to remove yeast to obtain dialysate, which has a refractive index of 16%;

2. Decolorization: The dialysate is decolorized by adding ordinary sugar alcohol at 0.5% (w/v) with activated carbon at 62°C. The decolorization time is 45 minutes, and the decolorization solution is obtained by filtration and separation. The light transmittance of the decolorization solution is 79.8%;

3. Deodorization: Add 0.05% (w/v) special activated carbon for deproteinization and removal of small molecular substances to the primary decolorization solution at 55°C to remove small molecular substances such as protein and color prerequisites. The decolorization time is 40 minutes and filtered Separation obtains secondary decolorization liquid;

4. Purification: The secondary decolorization liquid is ion-exchanged according to the process flow of D301——001*7——D301, and the erythritol feed liquid is further refined and purified. The light transmittance of the exchange liquid is 100%, and the conductivity is 5 μs/cm ;

5. Evaporation: Evaporate and concentrate the erythritol feed solution to a refractive concentration of 63%;

6. Crystallization: Erythritol crystallization adopts gradient cooling crystallization, the initial temperature is 68°C, and the cooling rate is 8°C/hr;

7. Separation and drying: the crystalline massecuite is separated and dried by a centrifuge to obtain crystalline erythritol. The crystallization yield was 86.7%.

Claims (1)

1. an erythritol preparation technology is characterized in that using the activated carbon decolorizing technology, and deproteinated, the special-purpose activated charcoal regulating YIN and YANG ion exchange resin that takes off small-molecule substance are made with extra care purification to fermented liquid, and its processing step is as follows:

(1) dialyzate preparation: with glucose is raw material, oozes the fermented liquid that yeast fermentation obtains through height, removes yeast through ceramic membrane filter, obtains dialyzate;

(2) decolouring: dialyzate adds common sugar alcohol by 0.1% ~ 1%(w/v) and decolours with gac under 40 ℃ ~ 75 ℃, bleaching time 20min ~ 80min, and filtering separation obtains destainer one time;

(3) taste removal: a destainer is under 40 ℃ ~ 75 ℃, carry out removing of small-molecule substances such as protein, color prerequisite by the special-purpose activated charcoal that 0.02% ~ 0.1%(w/v) adds deproteinated, takes off small-molecule substance, bleaching time 20min ~ 80min, filtering separation obtains secondary decolourization liquid;

(4) purify: secondary decolourization liquid is according to the moon---sun---, and ion-exchange is carried out in cloudy technical process, further the erythritol feed liquid is made with extra care purification, requires feed liquid transmittance 〉=99.8% through ion-exchange, specific conductivity≤10 μ s/cm;

(5) evaporation: with erythritol feed liquid evaporation concentration to refractive power concentration 55% ~ 75%;

(6) crystallization: the gradient cooling crystallization is adopted in the erythritol crystallization, and starting temperature is 65 ℃ ~ 75 ℃, and cooling rate is 0.5 ℃ ~ 10 ℃/hr;

(7) separate oven dry: the crystallization massecuite obtains the crystallization erythritol through whizzer separation, oven dry.