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Method for producing pure sodium alginate

A technology of pure sodium alginate and sodium alginate, applied in the field of sodium alginate production and processing, can solve the problems of increasing the production cost per unit of use, waste of extracted raw materials, and low purity, and achieves reduction of waste, improvement of purity, and reduction of production. cost effect

Inactive Publication Date: 2018-02-23
GUANGXI SHATIAN XIANRENTAN AGRI INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of sodium alginate produced at present is that it contains more impurities and has low purity. First, it causes waste of raw materials for extraction, and second, it increases the production cost of the user unit.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for producing pure sodium alginate, comprising the following steps:

[0023] Step (1): Dissolve crude sodium alginate in water and keep stirring to fully dissolve, then filter out insoluble matter and impurities with a filter; the ratio of crude sodium alginate to water is 1:40, and the water temperature is 55 ℃;

[0024] Step (2): Add 24% hydrochloric acid to the crude sodium alginate solution to make the pH value 2.2. After the free alginic acid is precipitated, wash the alginic acid with water to remove impurities;

[0025] Step (3): The washed alginic acid is made into sodium alginate glue, the preparation method is to add 18% NaOH solution to the alginic acid, shake well and let stand for 3 minutes to make sodium alginate glue;

[0026] Step (4): Add sodium hypochlorite to the sodium alginate glue for bleaching, stir well and then add warm water to dilute, so that the sodium alginate solution meets the quality standard; the quality standard is that the so...

Embodiment 2

[0031] A method for producing pure sodium alginate, comprising the following steps:

[0032] Step (1): Dissolve crude sodium alginate in water and keep stirring to fully dissolve, then filter out insoluble matter and impurities with a filter; the ratio of crude sodium alginate to water is 1:40, and the water temperature is 55 ℃;

[0033] Step (2): Add 24% hydrochloric acid to the crude sodium alginate solution to make the pH value 2.5. After the free alginic acid is precipitated, wash the alginic acid with water to remove impurities;

[0034] Step (3): The washed alginic acid is made into sodium alginate glue, the preparation method is to add 18% NaOH solution to the alginic acid, shake well and let stand for 5 minutes to make sodium alginate glue;

[0035] Step (4): Add sodium hypochlorite to the sodium alginate glue for bleaching, stir well and then add warm water to dilute, so that the sodium alginate solution meets the quality standard; the quality standard is that the so...

Embodiment 3

[0040] A method for producing pure sodium alginate, comprising the following steps:

[0041] Step (1): Dissolve crude sodium alginate in water and keep stirring to fully dissolve, then filter out insoluble matter and impurities with a filter; the ratio of crude sodium alginate to water is 1:40, and the water temperature is 55 ℃;

[0042] Step (2): Add 24% hydrochloric acid to the crude sodium alginate solution to make the pH value 2.4. After the free alginic acid is precipitated, wash the alginic acid with water to remove impurities;

[0043] Step (3): The washed alginic acid is made into sodium alginate glue, the preparation method is to add 18% NaOH solution to the alginic acid, shake well and let stand for 4 minutes to make sodium alginate glue;

[0044] Step (4): Add sodium hypochlorite to the sodium alginate glue for bleaching, stir well and then add warm water to dilute, so that the sodium alginate solution meets the quality standard; the quality standard is that the so...

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PUM

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Abstract

The invention relates to the technical field of production and processing of sodium alginate, in particular to a method for producing pure sodium alginate. The method comprises the steps of dissolvingcrude sodium alginate, precipitating alginic acid, preparing sodium alginate gel, bleaching the sodium alginate gel, neutralizing the alginic acid, dehydrating the colorless and transparent sodium alginate gel twice and performing vacuum drying. Sodium alginate produced with the conventional sodium alginate production method has higher impurity content and lower purity, thereby increasing the production cost of a use unit. According to the method disclosed by the invention, the alginic acid is precipitated twice and neutralized twice, the sodium alginate gel is bleached, and dehydration is performed twice to obtain the pure sodium alginate, so that the purity of the sodium alginate is increased greatly, and the production cost of the use unit is lowered effectively.

Description

technical field [0001] The invention relates to the technical field of production and processing of sodium alginate, in particular to a method for producing pure sodium alginate. Background technique [0002] Sodium alginate is a by-product of extracting iodine and mannitol from brown algae kelp or sargassum. It is a natural polysaccharide that has the stability, solubility, viscosity and safety required for pharmaceutical preparations. It is currently used in food Industry, textile industry, cosmetics manufacturing industry, paper industry, refrigeration materials, medicine and other fields have been widely used, so the market demand for it is increasing, and the quality is also getting higher and higher. The common problem of sodium alginate produced at present is that it contains more impurities and has low purity. First, it causes waste of raw materials for extraction, and second, it increases the production cost of the user unit. Contents of the invention [0003] Ai...

Claims

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Application Information

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IPC IPC(8): C08B37/04
CPCC08B37/0084C08B37/0003
Inventor 顾鹏威王小群卢月美
Owner GUANGXI SHATIAN XIANRENTAN AGRI INVESTMENT CO LTD
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