A membrane separation system for producing casein and whey

Abstract

The utility model discloses a membrane separation system for producing casein and whey, comprising: raw material storage tank, pre -filtration device, multistage membrane separation subassembly, concentrated liquid storage tank and dialysis fluid storage tank, raw material storage tank, pre -filtration device, multistage membrane separation subassembly are connected gradually through the pipeline, and be provided with one level or several levels membrane separation subassembly in multistage membrane separation subassembly, and each membrane separation subassembly is provided with a membrane separation device, concentrated liquid storage tank with last level membrane separation subassembly of multistage membrane separation subassembly's membrane separation device is connected to undertake concentrated liquid, dialysis fluid storage tank is connected with each membrane separation subassembly in multistage membrane separation subassembly's membrane separation device respectively to undertake each dialysis liquid. The utility model discloses through the mode of membrane separation, improves the solubility and dispersibility of casein, and makes whey retain more active ingredients.

Description

Technical Field

[0001] This utility model relates to the field of dairy processing technology, specifically to a membrane separation system for producing casein and whey. Background Technology

[0002] Casein and whey protein are two major proteins in cow's milk, and their production processes are based on their different physicochemical properties for separation and purification. Casein accounts for about 80% of the total protein content in cow's milk. It is a phosphoprotein, and its key characteristic is that it denatures and coagulates at pH 4.6, which is the key principle for its separation. Industrially, it is mainly produced through the "acid precipitation method" or the "rennet method." The former is used to manufacture casein products, and the latter is used in the production of raw cheese. Whey is a natural liquid byproduct produced during cow's milk processing. It contains about 20% whey protein, which is a water-soluble protein mixture. Its key characteristic is that it remains soluble even at pH 4.6, the condition where casein coagulates. However, the production of casein through the "acid precipitation method" or the "rennet method" requires the addition of skim milk as a raw material, and casein produced by these two methods suffers from poor solubility and a limited range of applications. Utility Model Content

[0003] The purpose of this invention is to provide a membrane separation system for producing casein and whey, which improves the solubility and dispersibility of casein through membrane separation, allowing whey to retain more active ingredients. To achieve the above objective, this invention adopts the following technical solution: This utility model discloses a membrane separation system for producing casein and whey, comprising: a raw material storage tank, a pre-filtration device, a multi-stage membrane separation component, a concentrate storage tank, and a dialysate storage tank.

[0004] The raw material storage tank, pre-filtration device, and multi-stage membrane separation assembly are connected in sequence by pipelines, and the multi-stage membrane separation assembly is provided with one or more membrane separation assemblies, and each membrane separation assembly is provided with one membrane separation device.

[0005] The concentrate storage tank is connected to the membrane separation device in the last stage of the multi-stage membrane separation assembly to receive the concentrate. The dialysate storage tank is connected to the membrane separation device in each stage of the multi-stage membrane separation assembly to receive dialysate from each stage.

[0006] Preferably, a first feed pump is provided between the raw material storage tank and the pre-filtration device to pump the raw material into the pre-filtration device, and the pre-filtration device is provided with a pre-filtration membrane, the filtration accuracy of the pre-filtration membrane being d, 0.05≤d≤0.5 mm.

[0007] Preferably, the membrane separation devices in each stage of the multi-stage membrane separation assembly are equipped with microfiltration membranes, the pore size of the microfiltration membranes is a, 0.05≤a≤0.3 μm, the pressure in the membrane separation devices is b, 0.1≤b≤5 Bar, and the channel spacing is c, 30≤c≤70 mil.

[0008] Preferably, a first concentration detector and a second control valve are provided between the concentrate storage tank and the membrane separation device in the last stage of the multi-stage membrane separation assembly.

[0009] Preferably, a second concentration detector is provided between the dialysate storage tank and the membrane separation device in the last stage of the multi-stage membrane separation assembly.

[0010] Furthermore, each stage of the multi-stage membrane separation assembly is also equipped with a third control valve and a third feed pump. The third control valve, the third feed pump, and the membrane separation device are connected in sequence to control the feeding of each stage of the membrane separation device.

[0011] Each stage of the multi-stage membrane separation assembly is further equipped with a fourth feed pump, which is connected to the membrane separation device and pumps the dialysate separated by each stage of the membrane separation device back to the membrane separation device of its own stage to control the transmembrane pressure difference in the membrane separation device of its own stage.

[0012] Preferably, the multi-stage membrane separation assembly is provided with N-stage membrane separation assemblies, and the fourth feed pump in the first-stage membrane separation assembly to the N-1-stage membrane separation assembly is also connected to the membrane separation device in the next-stage membrane separation assembly to pump the dialysate into the next-stage membrane separation device as washing water.

[0013] Furthermore, a fourth control valve and a fifth control valve are also provided in the primary membrane separation unit to the N-1 stage membrane separation unit to control the pumping of dialysate into the current stage membrane separation unit or the next stage membrane separation unit, respectively.

[0014] Furthermore, the membrane separation system for producing casein and whey also includes a clean water storage tank, a second feed pump is provided between the clean water storage tank and the multi-stage membrane separation assembly, and the clean water storage tank is connected to the membrane separation device in each stage of the multi-stage membrane separation assembly to input clean water as washing water.

[0015] Preferably, a flow meter and a first control valve are provided between the clean water storage tank and the membrane separation device in each stage of the membrane separation assembly to control the amount of water used for washing each stage of the membrane separation device.

[0016] After adopting the above technical solution, the present invention has the following effects: 1. This invention utilizes membrane separation technology to separate and concentrate casein and whey, enabling the production of casein of varying purities. The separated casein exhibits better solubility and dispersibility, as well as excellent foaming properties, making it widely applicable in functional foods and biomedicine. Simultaneously, the separated natural sweet whey retains more active ingredients, resulting in a milder taste and more natural sweetness compared to whey produced by acidification.

[0017] 2. The dialysate of this invention is equipped with a circulation loop, which can control the transmembrane pressure difference, obtain a higher whey permeation rate, and improve the separation degree of whey and casein. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system of this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the multi-stage membrane separation device of this utility model.

[0020] Figure 3 This is a process flow diagram of the present invention.

[0021] Main component symbols: 1: Raw material storage tank; 2: Pre-filtration device; 3: Multi-stage membrane separation assembly; 31: Primary membrane separation assembly; 311: First membrane separation unit; 312: Third feed pump A; 313: Fourth feed pump A; 314: Third control valve A; 315: Fourth control valve A; 316: Fifth control valve A; 32: Secondary membrane separation assembly; 321: Second membrane separation unit; 322: Third feed pump B; 323: Fourth feed pump B; 324: Third control valve B; 325: Fourth control valve B; 326: Fifth control valve B; 33: Tertiary membrane separation assembly; 331: Third membrane separation unit; 332: Third feed pump C; 333: Fourth feed pump C; 334: Third control valve C; 335: First concentration detector; 336: Second concentration detector. 4: Concentrate storage tank; 5: Dialysis fluid storage tank; 6: Clean water storage tank; 7: First feed pump; 8: Second feed pump; 9: Flow meter A; 10: Flow meter B; 11: Flow meter C; 12: First control valve A; 13: First control valve B; 14: First control valve B; 15: Second control valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2As shown, this utility model discloses a membrane separation system for producing casein and whey, including: a raw material storage tank 1, a pre-filtration device 2, a multi-stage membrane separation component 3, a concentrate storage tank 4, and a dialysate storage tank 5.

[0024] The raw material storage tank 1, the pre-filtration device 2, and the multi-stage membrane separation assembly 3 are connected in sequence by pipelines. The multi-stage membrane separation assembly 3 is equipped with one or more membrane separation assemblies, and each membrane separation assembly is equipped with a membrane separation device.

[0025] The concentrate storage tank 4 is connected to the membrane separation unit in the last stage of the multi-stage membrane separation assembly to receive the concentrate. The dialysate storage tank 5 is connected to the membrane separation unit in each stage of the multi-stage membrane separation assembly to receive dialysate from each stage.

[0026] In this embodiment, the multi-stage membrane separation assembly 3 is provided with a three-stage membrane separation assembly, which is divided into a first-stage membrane separation assembly 31, a second-stage membrane separation assembly 32 and a third-stage membrane separation assembly 33. Each stage membrane separation assembly is provided with a membrane separation device, which is divided into a first membrane separation device 311, a second membrane separation device 321 and a third membrane separation device 331, which are connected in sequence.

[0027] Meanwhile, the concentrate storage tank 4 is connected to the third membrane separation device 331 to receive the concentrate after multi-stage membrane separation. A first concentration detector 335 and a second control valve 15 are also installed between the concentrate storage tank 4 and the third membrane separation device 331. The dialysate storage tank 5 is connected to the first membrane separation device 311, the second membrane separation device 321, and the third membrane separation device 331 respectively to receive dialysates at each stage. A second concentration detector 336 is also installed between the dialysate storage tank 4 and the third membrane separation device 331.

[0028] The first concentration detector 335 and the second concentration detector 336 typically employ refractometers to control product quality indicators.

[0029] A first feed pump 7 is installed between the raw material storage tank 1 and the pre-filtration device 2 to pump the raw material into the pre-filtration device 2. The pre-filtration device 2 is equipped with a pre-filtration membrane with a filtration accuracy of d, where 0.05≤d≤0.5 mm.

[0030] Furthermore, each stage of the multi-stage membrane separation assembly is equipped with a microfiltration membrane, the pore size of which is a, 0.05≤a≤0.3 μm, the pressure in the membrane separation device is b, 0.1≤b≤5 Bar, and the channel spacing is c, 30≤c≤70 mil.

[0031] Secondly, in this embodiment, each stage of the multi-stage membrane separation assembly is further equipped with a third control valve, a third feed pump, and a fourth feed pump. The third control valve, the third feed pump, and the membrane separation device are connected in sequence to control the feeding of each stage of the membrane separation device.

[0032] The fourth feed pump is connected to the membrane separation unit and pumps the dialysate separated by each stage of the membrane separation unit back to the current stage of the membrane separation unit in order to control the transmembrane pressure difference in the current stage of the membrane separation unit.

[0033] The primary membrane separation unit 31 is equipped with a third control valve A 314, a third feed pump A 312, and a fourth feed pump A 313. The secondary membrane separation unit 32 is equipped with a third control valve B 324, a third feed pump B 322, and a fourth feed pump B 323. The tertiary membrane separation unit 33 is equipped with a third control valve C 334, a third feed pump C 332, and a fourth feed pump C 333.

[0034] Meanwhile, the fourth feed pump A 313 in the primary membrane separation unit and the fourth feed pump B 323 in the secondary membrane separation unit are also connected to the membrane separation device in the next-stage membrane separation unit to pump the dialysate into the next-stage membrane separation device as washing water. Furthermore, the primary membrane separation unit 31 and the secondary membrane separation unit 32 are also equipped with a fourth control valve and a fifth control valve to control the pumping of dialysate from each stage into the respective membrane separation device or the next-stage membrane separation device. Specifically, the primary membrane separation unit 31 is equipped with a fourth control valve A 315 and a fifth control valve A 316, and the secondary membrane separation unit 32 is equipped with a fourth control valve B 325 and a fifth control valve B 326.

[0035] In addition, the membrane separation system for producing casein and whey also includes: a clean water storage tank 6, a second feed pump 8 is provided between the clean water storage tank 6 and the multi-stage membrane separation assembly 3, and the clean water storage tank 6 is connected to the membrane separation device in each stage of the multi-stage membrane separation assembly 3 to input clean water as washing water.

[0036] The clear water storage tank 6 is equipped with a flow meter and a first control valve between itself and the membrane separation devices in each stage of the membrane separation assembly to control the amount of water used for washing the membrane separation devices at each stage. The clear water storage tank typically stores pure water, soft water, or lactose-free recycled water generated in other processes. A flow meter A 9 and a first control valve A 12 are installed between the clear water storage tank 6 and the first membrane separation device 311 in the first-stage membrane separation assembly 31; a flow meter B 10 and a first control valve B 13 are installed between the clear water storage tank 6 and the second membrane separation device 321 in the second-stage membrane separation assembly 32; and a flow meter C 11 and a first control valve C 14 are installed between the clear water storage tank 6 and the third membrane separation device 331 in the tertiary membrane separation assembly.

[0037] Referring to Figure 3, the process for producing casein and whey using this invention includes the following steps: S1. Pre-filtration of skim milk: The skim milk in raw material storage tank 1 is pumped into pre-filtration device 2 through the first feed pump 7 for pre-filtration. The fat content of the skim milk in raw material storage tank 1 is 0.06% (usually below 0.1%).

[0038] S2. Multi-stage membrane separation: The skim milk pre-filtered in step S1 is sequentially passed through the first-stage membrane separation component 31, the second-stage separation component 32, and the third-stage membrane separation component 33. Each stage of the membrane separation component is equipped with a microfiltration membrane with a pore size of 0.1 μm, and the pressure in the membrane separation device is 2.5 Bar, with a flow channel spacing of 45 mil. The table below shows the component content of the concentrate and dialysate after three-stage membrane separation:

[0039] S3. Collection and transfer of casein and whey: The concentrate and dialysate separated in step S2 are collected in concentrate storage tank 4 and dialysate storage tank 5 respectively, and then transferred to the next process for casein purification or for separation and purification of whey protein and lactose in whey.

[0040] The above description is only a preferred embodiment of the present utility model. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A membrane separation system for producing casein and whey, characterized in that, include: Raw material storage tanks, pre-filtration devices, multi-stage membrane separation components, concentrate storage tanks, and dialysate storage tanks. The raw material storage tank, the pre-filtration device, and the multi-stage membrane separation assembly are connected in sequence by pipelines, and the multi-stage membrane separation assembly is provided with one or more membrane separation assemblies, and each membrane separation assembly is provided with one membrane separation device. The concentrate storage tank is connected to the membrane separation device in the last stage of the multi-stage membrane separation assembly to receive the concentrate; the dialysate storage tank is connected to the membrane separation device in each stage of the multi-stage membrane separation assembly to receive dialysate from each stage.

2. The membrane separation system for producing casein and whey as described in claim 1, characterized in that: A first feed pump is provided between the raw material storage tank and the pre-filtration device to pump the raw material into the pre-filtration device, and the pre-filtration device is provided with a pre-filtration membrane, the filtration accuracy of the pre-filtration membrane being d, 0.05≤d≤0.5 mm.

3. The membrane separation system for producing casein and whey as described in claim 1, characterized in that: Each stage of the multi-stage membrane separation assembly is equipped with a microfiltration membrane. The pore size of the microfiltration membrane is a, 0.05≤a≤0.3 μm, and the pressure in the membrane separation device is b, 0.1≤b≤5 Bar. The channel spacing is c, 30≤c≤70 mil.

4. The membrane separation system for producing casein and whey as described in claim 1, characterized in that: A first concentration detector and a second control valve are provided between the concentrate storage tank and the membrane separation device in the last stage of the multi-stage membrane separation assembly.

5. A membrane separation system for producing casein and whey as described in claim 1, characterized in that: A second concentration detector is installed between the dialysate storage tank and the membrane separation device in the last stage of the multi-stage membrane separation assembly.

6. A membrane separation system for producing casein and whey as described in claim 1, characterized in that: The multi-level Each stage of the membrane separation unit is also equipped with a third control valve and a third feed pump. The third control valve, the third feed pump and the membrane separation device are connected in sequence to control the feed of each stage of the membrane separation device.

7. A membrane separation system for producing casein and whey as described in claim 6, characterized in that: Each stage of the multi-stage membrane separation assembly is further provided with a fourth feed pump, which is connected to the membrane separation device and pumps the dialysate separated by each stage of the membrane separation device back to the membrane separation device of its own stage in order to control the transmembrane pressure difference in the membrane separation device of its own stage.

8. A membrane separation system for producing casein and whey as described in claim 7, characterized in that: The multi-stage membrane separation assembly is provided with N stages of membrane separation assembly, and the fourth feed pump in the first stage membrane separation assembly to the N-1 stage membrane separation assembly is also connected to the membrane separation device in the next stage membrane separation assembly to pump the dialysate into the next stage membrane separation device as washing water. Furthermore, a fourth control valve and a fifth control valve are also provided in the primary membrane separation unit to the N-1 stage membrane separation unit to control the pumping of dialysate into the current stage membrane separation unit or the next stage membrane separation unit, respectively.

9. A membrane separation system for producing casein and whey as described in any one of claims 1-8, characterized in that: Also includes: A clean water storage tank is provided, and a second feed pump is provided between the clean water storage tank and the multi-stage membrane separation assembly. The clean water storage tank is connected to the membrane separation device in each stage of the multi-stage membrane separation assembly to input clean water as washing water.

10. A membrane separation system for producing casein and whey as described in claim 9, characterized in that: A flow meter and a first control valve are installed between the clear water storage tank and the membrane separation devices in each stage of the membrane separation assembly to control the amount of water used for washing each stage of the membrane separation device.

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