Method for extracting and purifying sugar alcohol with high purity and high yiel

Abstract

The invention provides a method for extracting and purifying sugar alcohol with high purity and high yield, which comprises the following steps of: performing partial purification on the sugar alcohol in a raw material solution through a microfiltration-ultrafiltration-nanofiltration process, and removing protein impurities in the raw material solution by using an ultrafiltration membrane to achieve the effects of improving the nanofiltration concentration multiple, reducing the chemical cleaning frequency and improving the purity of the sugar alcohol; guiding concentrated water of the first-section micro-filtration membrane device and concentrated water of the first-section nano-filtration membrane device into a second-section micro-filtration membrane device and a second-section nano-filtration membrane device respectively again to conduct circulating concentration on feed liquid, and guiding concentrated water of the second-section nano-filtration membrane device into a third-section nano-filtration membrane device to conduct concentration again; enabling the produced water of the reverse osmosis membrane device to flow back to the inlet water of the second-section micro-filtration membrane device and the third-section nano-filtration membrane device, so that the concentrated water of the first-section micro-filtration membrane device and the concentrated water of the second-section nano-filtration membrane device are diluted, and the produced water of the second-section micro-filtration membrane device is used for diluting the concentrated water of the first-section nano-filtration membrane device, and therefore, the transmittance of sugar alcohol in the concentration process is further increased, the concentration load of two-section nanofiltration and three-section nanofiltration is reduced, meanwhile, the resource consumption is greatly reduced, and a complete internal circulation is formed; the method provided by the invention provides an efficient non-batch switching operation process for the purification of sugar alcohol, and maximizes the stability and continuity of a process line under the condition of further improving the product yield and purity.

Description

technical field [0001] The invention belongs to the field of water treatment and relates to a high-purity and high-yield extraction and purification method of sugar alcohol. Background technique [0002] As an emerging sweetener, sugar alcohols have been widely used by food manufacturers. Sugar alcohol itself and sugar and its similar sweetness and high thermal stability make it a perfect substitute for sugar to be added to low-calorie food formulas. With the rapid spread of healthy eating concepts, the demand for sugar alcohols is increasing day by day, and sugar alcohols are obtained by reducing aldehyde groups or ketone groups in different types of sugars to hydroxyl groups. In the production process, the product yield and purity As a core index, it greatly affects its final quality. Membrane technology can effectively and economically complete the purification process of sugar alcohol. Traditional methods mostly use a single-line process of ceramic membrane plus nanofil...

AI Technical Summary

Problems solved by technology

With the rapid spread of healthy eating concepts, the demand for sugar alcohols is increasing day by day, and sugar alcohols are obtained by reducing aldehyde groups or ketone groups in different types of sugars to hydroxyl groups. In the production process, the product yield and purity As a core index, it greatly affects its final quality. Membrane technology can effectively and economically complete the purification process of sugar alcohol. Traditional methods mostly use a single-line process of ceramic membrane plus nanofiltration membrane to complete the purification of sugar alcohol. The yield of sugar alcohol is 86 Between -94% and purity <95%. As the competition in the sugar alcohol market intensifies, the traditional single-line process can no longer meet the production demand. Therefore, how to complete the purification of sugar alcohol more efficiently has become the food production industry and the field of membrane technology. A breakthrough in the development of the process

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