Milk concentrating method and system based on forward osmosis technology

Abstract

The invention discloses a milk concentrating method and system based on forward osmosis technology. The method comprises the following steps: an original extract liquid permeates and extracts water molecules in raw milk through a forward osmotic process, and concentrated milk and a diluted extract liquid are obtained. The system comprises a raw milk tank, a concentrated forward osmotic membrane unit, a concentrated milk collection tank, a diluted extract liquid regeneration and reuse unit and an original extract liquid tank which are connected. By adopting of the concentrating forward osmoticmembrane unit, the effective ingredients in the milk can be concentrated, the water content of the milk can be reduced, the high-concentration milk can be prepared, and the product quality can be improved; the milk is concentrated by the forward osmotic technology, the solid content of about 60% (30%-70%) can be obtained, and the solid content is higher than that of other low-temperature concentrating technologies.

Description

technical field [0001] The invention relates to the technical field of milk product concentration, in particular to a milk concentration method and system based on forward osmosis technology. Background technique [0002] Dairy products are rich in nutrition, easy to digest and absorb, and have always been the first choice of nutritious food for the public. Among them, milk is one of the oldest natural beverages, known as "white blood", and its importance to the human body can be imagined. Milk is rich in various minerals, among which the ratio of calcium and phosphorus is very appropriate, which is conducive to the absorption of calcium; at the same time, it also contains rich essential amino acids needed by the human body. [0003] With the improvement of living standards, domestic consumers have higher and higher requirements for the taste and quality of dairy products, especially the improvement of the quality and taste requirements of dairy products, which makes manufa...

AI Technical Summary

Problems solved by technology

The traditional evaporation is to remove the moisture through high temperature and high pressure. The disadvantages of this technology are: first, the energy consumption is high, and a large amount of steam is required; second, the nutritional factor, heating during evaporation, the intensity is too strong, which will cause some milk The active substances in the milk are severely damaged; the third is the efficiency factor, such as flash evaporation can only remove up to 10% of the water, which still cannot meet the production requirements when producing high milk solids milk products

Disadvantages of this technology: first, the energy consumption is too high, because the soluble solid content in milk is high, in order to overcome the osmotic pressure difference, it must be operated at high pressure, the pump power is large, and the energy consumption is high; the second is limited by the high operating pressure, the concentration factor is low The third is that due to the high pressure operation, the pollution of the membrane is more serious, the loss of the membrane is greater, and the loss of active ingredients is also caused; the fourth is that in order to increase the speed of reverse osmosis, sometimes the milk must be heated, which affects the quality of the milk

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