Novel method for extracting sodium gluconate

Abstract

The invention belongs to a preparation process of sodium gluconate and in particular relates to a novel method for extracting the sodium gluconate. The preparation process comprises the following concrete steps of: filtering and decoloring a sodium gluconate fermentation liquor; then concentrating the sodium gluconate fermentation liquor to 40-60% of the original concentration; adding an ethanol solution to the sodium gluconate fermentation liquor and stirring for 3-8h; crystallizing, sedimenting and separating; evaporating a separated clear solution; extracting ethanol; recycling raffinate into the fermentation liquor; and drying a crystal to prepare a sodium gluconate solid. By adopting the novel method for extracting the sodium gluconate, the crystallization yield of the sodium gluconate can be improved; the production cost of the sodium gluconate is lowered; a large amount of energy resources is saved; the occurrence of side reaction is reduced; the product has high purity; no wastewater is discharged in the whole production course; and a cycle process is utilized.

Description

Technical field: [0001] The invention belongs to the preparation process of sodium gluconate, in particular to a novel method for extracting sodium gluconate. Background technique: [0002] Sodium gluconate, also known as sodium pentahydroxycaproate, is a white or light yellow crystalline powder. It is a polyhydroxy organic acid salt with a wide range of uses. Due to its non-toxicity and wide source of raw materials, it is mainly used in industry. Water quality stabilizer, steel surface cleaning agent, special cleaning agent for glass bottles, cement admixture, etc.; in medicine, it can be used as a laxative and pH adjustment to maintain the acid-base balance of the human body; in the food industry, due to its excellent taste, it can be It can be used as a taste improving agent to cover up bitterness and odor and improve taste; because it can effectively prevent the occurrence of low sodium syndrome, it can also be used as a food additive. [0003] At present, the extractio...

AI Technical Summary

Problems solved by technology

[0003] At present, the extraction process of sodium gluconate is produced by fermentation (as shown in the accompanying drawing As shown in Figure 1) there are the following problems: with the increase in the number of remixing of the mother liquor, the color of the mother liquor will deepen, affecting the color of the finished product; as the mother liquor The increase in the number of remixes, the increase of residual sugar and impurities in the mother liquor affect the purity of the product; the selling price of the mother liquor is very low; the crystallization yield of sodium gluconate is not high, less than 90%; crystallization above 65 ° C, due to long time The high temperature causes the color of the mother liquor to be too dark, which increases the difficulty of decolorization of activated carbon, increases the amount of activated carbon, and increases the production cost of sodium gluconate

Images