Process for extracting the soyabean oligosaccharides by air-float purification and film integration

Abstract

The invention relates to a method for extracting edible oligosaccharides, specifically a method for extracting soybean oligosaccharides from soybean whey liquid by flotation purification and membrane concentration. The method comprises the following steps: thermal coagulation, cooling, high-speed centrifugal separation, pH adjustment and flocculation, secondary high-speed centrifugal separation, flotation separation, first-stage ultrafiltration, decolorization with ion exchange resin, electrodialysis desalination, further desalination with ion exchange resin, second-stage ultrafiltration, reverse osmosis concentration, activated carbon decolorization, diatomite filtration, terminal ultrafiltration and negative-pressure evaporation concentration. The invention has the advantages that: 1. based on the reasonable combination of proper molecular weight cut-off of ultrafiltration membrane and membrane assembly, operation mode and efficient cleaning, the method works continuously and stably for long time; 2. the method realizes the pretreatment by using multi-stage high-efficiency centrifugal separation technique, without using filter aids and producing pollutants, and the separated protein residue can be recycled; and 3. the method has simple process and low equipment and operation costs.

Description

Technical field: [0001] The invention relates to a method for extracting edible oligosaccharides, in particular to a method for extracting soybean oligosaccharides by air flotation purification and membrane integration, and extracting soybean oligosaccharides from soybean whey liquid. Background technique: [0002] Soybean oligosaccharides undergo biological action in the intestines to produce carbon dioxide and other gases, causing uncomfortable flatulence, which cannot be digested and absorbed by the human body, and are considered not to be nutrients for the human body, thus negating the use value of soybean oligosaccharides. However, as people have found through research in recent years, soybean oligosaccharides are not the substances that cause flatulence, but more importantly, they are the best proliferation substances for bifidobacteria that are closely related to the growth of the human body, the normal metabolism of the body, and the prevention and treatment of diseas...

AI Technical Summary

Problems solved by technology

Because whey protein has a certain viscosity, it is easy to attach to the membrane and form a gel, which will block the membrane pores, resulting in rapid decay of the membrane flux, so that the ultrafiltration cannot be performed normally.

[0007] 2. Membrane cleaning problem

Because soybean whey contains some small molecular proteins with good thermal stability and electrolyte stability, it is impossible to completely separate the protein by filtration, or if the protein is not properly operated, it will cause serious membrane pollution. The problem is that despite various cleaning methods, it is difficult to restore the original flux, and even make the ultrafiltration membrane unable to operate normally

[0008] 3. Environmental pollution problems

Since the protein in the soybean whey is usually separated by a plate and frame filter, a large amount of diatomite must be added as a filter aid, so a large amount of mixed waste of diatomite and protein will be generated during the operation, and cause environmental pollution

Images