Process for removing lactose in milk

A technology for delactose and milk, applied in the field of membrane separation, can solve the problems of low protein/lactose separation factor and low flux, and achieve the effects of strong anti-biological pollution, high nutritional value, and high-temperature disinfection alleviation.

Pending Publication Date: 2022-04-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is: in the prior art, when ultrafiltration membrane (polymer membrane) is used to process milk for delactose treatment, there are problems of low flux and low protein / lactose separation factor

Method used

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  • Process for removing lactose in milk
  • Process for removing lactose in milk
  • Process for removing lactose in milk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This example is used to compare the treatment effects of three different ceramic membranes on milk lactose. The three ceramic membranes used in this example are: Al with a pore size of ~5nm 2 o 3 and ZrO 2 Ultrafiltration membranes and Al with a pore size of ~100nm 2 o 3 microfiltration membrane.

[0054] Al in this patent 2 o 3 The number of pores in the ultrafiltration membrane within the pore diameter range of 1.3-4nm accounts for more than 80%.

[0055] ZrO in this patent 2 The number of pores in the ultrafiltration membrane in the range of 0.2-3nm pore diameter accounts for more than 80%.

[0056] The microfiltration membrane in this patent has more than 99% of the pores in the 94-104nm pore diameter range.

[0057] Put 10kg of skimmed milk raw material into the raw material tank, and use the above three ceramic membranes for pre-concentration, the pre-concentration factor is 2, the operating pressure is 2bar, the temperature is 30°C, and the membrane surf...

Embodiment 2

[0061] Add 10kg of skimmed milk raw material into the raw material tank, use 50nm ceramic microfiltration membrane for pre-concentration, the pre-concentration factor is 2, the operating pressure is 2bar, the temperature is 50°C, and the membrane surface flow rate is 6.5m·s -1 , to obtain 5kg of the first concentrated solution containing protein, calcium, part of lactose and 5kg of the first permeate containing lactose, small molecule vitamins, etc.; the first concentrated solution is carried out to constant volume intermittent feeding diafiltration, the operating pressure is 5bar, the temperature at 50°C, the flow velocity at the membrane surface is 6.5m·s -1 , first add 1 kg of water to the concentrated side, then concentrate the raw material side to 5 kg, perform the first diafiltration, repeat 9 times of diafiltration to obtain 5 kg of the second concentrate containing concentrated protein and calcium and 9 kg of lactose and small molecule vitamins The second permeate and ...

Embodiment 3

[0063] Add 10kg of skimmed milk raw material into the raw material tank, use 50nm ceramic microfiltration membrane for pre-concentration, the pre-concentration factor is 2, the operating pressure is 2bar, the temperature is 50°C, and the membrane surface flow rate is 6.5m·s -1 , to obtain 5kg of the first concentrated solution containing protein, calcium, part of lactose and 5kg of the first permeate containing lactose, small molecule vitamins, etc.; the first concentrated solution is carried out to constant volume intermittent feeding diafiltration, the operating pressure is 5bar, the temperature at 50°C, the flow velocity at the membrane surface is 6.5m·s -1 , first add 1 kg of water to the concentrated side, then concentrate the raw material side to 5 kg, perform the first diafiltration, and repeat the 2 times of diafiltration to obtain 5 kg of the second concentrate containing concentrated protein and calcium and 2 kg of lactose and small molecule vitamins. The second perm...

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Abstract

The invention relates to a process for removing lactose in milk, which adopts an efficient ceramic microfiltration membrane to separate lactose in milk, and realizes preparation of low-lactose milk and lactose-free milk. According to the method disclosed by the invention, the loss rate of protein in the milk is lower than 1%, the removal rate of lactose is as high as 90%, the permeation flux is far higher than that of ultrafiltration in the existing membrane technology, and the method has the advantages of high production efficiency, high efficiency and low energy consumption, and realizes rapid removal of lactose in the milk. Meanwhile, the method is simple in process, chemical substances are not added in the process, the original flavor of the milk is reserved, control is easy, and automation is achieved.

Description

technical field [0001] The invention relates to a method for removing lactose in milk based on ceramic membrane separation technology, and belongs to the technical field of membrane separation. Background technique [0002] Milk is an important source of nutrients, but it also contains a lot of lactose. About 70% of the world's population has symptoms of lactose intolerance. Immediately after ingesting lactose, adverse reactions such as diarrhea, flatulence, and abdominal pain occur, so it is necessary to produce low-lactose milk or lactose-free milk. Lactose-free milk currently produced on the market usually decomposes lactose by adding exogenous lactase, but the enzymatic hydrolysis method can only convert lactose into simple sugars, and this hydrolysis process will produce additional sweetness, which is not suitable for special populations, such as Patients with hyperglycemia and those on a low-sugar diet; at the same time, the enzyme is expensive, and the free lactase i...

Claims

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Application Information

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IPC IPC(8): A23C9/142
Inventor 陈献富齐婷杨丹范益群
Owner NANJING UNIV OF TECH
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