Combined process method applied to desalination of starch hydrolysate

A combined process and hydrolyzate technology, applied in chemical instruments and methods, applications, sugar production, etc., can solve the problems of high sugar loss rate, membrane fouling, and low desalination efficiency, and achieve less sugar loss, high-efficiency desalination, cost reduction effect

Pending Publication Date: 2019-05-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned devices or methods still have the problems of low desalination efficiency, high sugar loss rate or serious membrane fouling during electrodialysis desalination, which limits its further application.

Method used

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  • Combined process method applied to desalination of starch hydrolysate

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Effect test

Embodiment 1

[0067] This embodiment provides a combined process method for starch hydrolyzate desalination, the process flow diagram of the method is as follows figure 1 shown, including the following steps:

[0068] (1) The pretreated cornstarch hydrolyzate is cooled by a plate-and-frame heat exchanger, the temperature of the cornstarch hydrolyzate is 65°C, the pH value is 3.7, wherein the starch sugar content is 31wt%, and the inorganic salt content is 450mg / L, also contains a small amount of impurities such as water-soluble protein, organic acid, pigment, enzyme and microbial cells, the temperature of corn starch hydrolyzate after cooling is 30 ℃;

[0069] (2) the starch hydrolyzate after step (1) is cooled adopts precision filter to carry out precision filtration, and the filter core pore size of described precision filter is 5 μ m, then carries out ultrafiltration, and the molecular weight cut-off of used ultrafiltration membrane module is greater than 10000Da, Obtain ultrafiltration...

Embodiment 2

[0074] The present embodiment provides a combined process method for starch hydrolyzate desalination, said method comprising the following steps:

[0075] (1) The pretreated cornstarch hydrolyzate is cooled by a plate-and-frame heat exchanger, the temperature of the cornstarch hydrolyzate is 40°C, the pH value is 3.0, wherein the starch sugar content is 25wt%, and the inorganic salt content is 200mg / L, also contains a small amount of impurities such as water-soluble protein, organic acid, pigment, enzyme and microbial cells, the temperature of corn starch hydrolyzate after cooling is 10 ℃;

[0076] (2) the starch hydrolyzate after step (1) is cooled adopts precision filter to carry out precise filtration, and the filter core pore size of described precision filter is 8 μ m, then carries out ultrafiltration, and the molecular weight cut-off of used ultrafiltration membrane assembly is greater than 5000Da, Obtain ultrafiltration fresh water and ultrafiltration concentrated water...

Embodiment 3

[0081] The present embodiment provides a combined process method for starch hydrolyzate desalination, said method comprising the following steps:

[0082](1) The pretreated cornstarch hydrolyzate is cooled by a plate and frame heat exchanger, the temperature of the cornstarch hydrolyzate is 70°C, the pH value is 5.0, wherein the starch sugar content is 35wt%, and the inorganic salt content is 1000mg / L, also contains a small amount of impurities such as water-soluble protein, organic acid, pigment, enzyme and microbial cells, the temperature of corn starch hydrolyzate after cooling is 40 ℃;

[0083] (2) the starch hydrolyzate after step (1) is cooled adopts precision filter to carry out precise filtration, and the filter element pore size of described precision filter is 1 μ m, then carries out ultrafiltration, and the molecular weight cut-off of used ultrafiltration membrane module is greater than 3000Da, Obtain ultra-filtered fresh water and ultra-filtered concentrated water,...

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Abstract

The invention provides a combined process method applied to desalination of starch hydrolysate. The method comprises the following steps: successively carrying out precise filtration and ultrafiltration on the starch hydrolysate to obtain ultrafiltration fresh water and ultrafiltration concentrated water; carrying out electric membrane desalination on the obtained ultrafiltration fresh water to obtain primary desalinated starch hydrolysate and concentrated saline water; and carrying out ion exchange secondary desalination on the obtained primary desalinated starch hydrolysate to obtain deeplydesalinated starch hydrolysate. Through organic combination and synergistic effects of different desalination processes, especially electric membrane desalination enables the desalination rate of thestarch hydrolysate to reach 80% or above, and then ion exchange desalination is used for finally enabling the conductivity of the starch hydrolysate to be not higher than 5 mu S/cm; the method is capable of obviously slowing down membrane pollution, greatly prolonging the regeneration period of resin and reducing the acid and alkaline consumption and operation cost for regeneration of the resin, is applicable to desalination treatment of the starch hydrolysate from different sources, and is low in energy consumption, high in stability and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of sugar desalination, and relates to a combined process method for desalination of starch hydrolyzate. Background technique [0002] With the rapid development of the starch sugar industry, the scale and production capacity of starch sugar enterprises have continued to expand, and it has become one of the important ways of agricultural industrialization and grain deep processing. At present, the annual output of starch sugar in my country is about 11 million to 12 million tons. The desalination process adopts the traditional anion-cation multi-stage ion exchange method, and the refined starch syrup is obtained by removing salt through ion exchange resin. Due to the limited adsorption saturation capacity of ion exchange resin, dilute hydrochloric acid and low-concentration caustic soda need to be frequently used for regeneration, rinsed with demineralized water, and the resulting washing water is discharged ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C13K13/00
Inventor 曹宏斌石绍渊李玉平段锋王于杰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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