Lactose-free milk preparation method based on separation membrane technologies

Abstract

The invention discloses a lactose-free milk preparation method based on separation membrane technologies, in which the four membrane technologies of microfiltration, ultrafiltration, electrodialysis and nanofiltration are coupled. The method includes the steps that firstly, most components in milk are intercepted through microfiltration and ultrafiltration, a penetrating solution is an aqueous solution containing lactose and inorganic salt, and after the inorganic salt is recovered by electrodialysis, desalinated liquid containing lactose and a small amount of inorganic salt is obtained; then,the desalinated liquid is subjected to nanofiltration separation to intercept lactose, and thus lactose removal is completed; components except lactose are recombined to obtain lactose-free milk powder through spray drying. By means of the method, the lactose interception rate reaches up to 95.85%; the production of the lactose-free milk powder is realized; meanwhile, water added in the production process can be effectively recovered and reused, lactose is also recovered by nanofiltration, and thus the method can guarantee that the whole process is environmentally friendly and free of by-product generation and raw material waste; besides, no chemical substance is added in the process, and thus the taste of milk will not be affected.

Description

technical field [0001] The invention relates to a method for preparing lactose-free milk based on separation membrane technology. Background technique [0002] Milk is rich in protein and minerals, and milk is the best source of calcium for the human body, known as "white blood". However, the presence of lactose in milk is extremely inconvenient for most people who are lactose intolerant. Because the patient's intestinal tract cannot secrete the enzyme that breaks down lactose, the lactose is digested and absorbed for use by the human body. Lactose will be decomposed by bacteria in the intestinal tract into lactic acid, thereby destroying the alkaline environment of the intestinal tract, and causing the intestinal tract to secrete a large amount of alkaline digestive juice to neutralize the lactic acid. So prone to mild diarrhea. The lactose-free milk currently on the market is basically obtained by enzymatic hydrolysis of lactose. However, due to the high cost of the enz...

AI Technical Summary

Problems solved by technology

At present, the lactose-free milk on the market is basically obtained by enzymatic hydrolysis of lactose. However, due to the high cost of the enzyme, and the difficulty of recovering the free lactase, the enzyme is easily inactivated and other disadvantages.