Device for separating lactic acid and protein in corn soaking water

Abstract

The utility model discloses a device for separating lactic acid and protein in corn soaking water. The device comprises a ceramic membrane filter, a settling tank, a tubular centrifuge and a nanofiltration membrane filter, a trapped fluid outlet of the nanofiltration membrane filter is communicated with a first heat concentration tank, a first crystallizing tank, a first plate and frame filter, a spray dryer and a protein storage tank; a permeate outlet of the nanofiltration membrane filter is sequentially communicated with a second thermal concentration tank, a second crystallizing tank and a second plate-and-frame filter; solid outlets of the first plate-and-frame filter and the second plate-and-frame filter are sequentially communicated with a third crystallizing tank, a third plate-and-frame filter, a drying tank and a lactic acid storage tank; the settling tank is communicated with a tartaric acid solution storage tank and a sodium hydroxide solution storage tank. The device can effectively recover protein and lactic acid from a phytic acid removing solution, and the economic value of corn soaking water is improved.

Description

Technical Field

[0001] This utility model relates to the field of resource recycling technology, specifically to a device for separating lactic acid and protein from corn soaked in water. Background Technology

[0002] Corn soaking water is a byproduct of starch production, containing abundant soluble protein, as well as phytic acid, lactic acid, plant calcium and magnesium salts, and soluble sugars. Phytic acid has a certain complexing effect, capable of forming stable complexes with metal ions, and phytates can be used to produce inositol. Therefore, recovering phytic acid from corn soaking water is of great significance. The above process generates a large amount of dephyticated corn soaking water. Analysis shows that dephyticated corn soaking water contains abundant water-soluble protein, lactic acid, and other effective substances; however, its complex composition makes the recovery of protein and lactic acid very difficult. Therefore, providing a device for efficiently recovering protein and lactic acid from dephyticated corn soaking water is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a device for separating lactic acid and protein in corn soaking water, which can effectively recover protein and lactic acid from phytic acid-free solution and improve the economic value of corn soaking water.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] An apparatus for separating lactic acid and protein from corn soaking water includes a ceramic membrane filter, a sedimentation tank, a tubular centrifuge, and a nanofiltration membrane filter. The retentate outlet of the nanofiltration membrane filter is connected to a first thermal concentration tank, a first crystallization tank, a first plate and frame filter, a spray dryer, and a protein storage tank. The permeate outlet of the nanofiltration membrane filter is sequentially connected to a second thermal concentration tank, a second crystallization tank, and a second plate and frame filter. The solid outlets of the first and second plate and frame filters are sequentially connected to a third crystallization tank, a third plate and frame filter, a drying tank, and a lactic acid storage tank. The sedimentation tank is connected to a tartaric acid solution storage tank and a sodium hydroxide solution storage tank.

[0006] Preferably, the sedimentation tank is provided with a jacket, and the jacket is provided with a heat exchange medium inlet and a heat exchange medium outlet.

[0007] Preferably, the precipitation tank is equipped with a pH sensor, and the connecting pipe between the sodium hydroxide solution storage tank and the precipitation tank is equipped with an electric valve, which is interlocked with the pH sensor.

[0008] Preferably, the clear liquid outlet of the tubular centrifuge is connected to the nanofiltration membrane filter.

[0009] Preferably, the first crystallization tank, the second crystallization tank, and the third crystallization tank are all equipped with a stirring mechanism, which includes a stirring shaft, stirring blades mounted on the stirring shaft, and a stirring motor that drives the stirring shaft to rotate.

[0010] Preferably, the stirring shaft is further provided with stirring frames on both sides that abut against the first crystallization tank, the second crystallization tank, and the third crystallization tank.

[0011] Preferably, the bottom of the stirring frame is provided with auxiliary stirring blades, which abut against the bottom of the first crystallization tank, the second crystallization tank, and the third crystallization tank.

[0012] Preferably, the auxiliary stirring blades are provided with multiple turbulence holes.

[0013] Preferably, the turbulence hole is provided with turbulence teeth.

[0014] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0015] This invention provides a device for separating lactic acid and protein from corn soaking water, comprising a ceramic membrane filter, a sedimentation tank, a tubular centrifuge, and a nanofiltration membrane filter. The retentate outlet of the nanofiltration membrane filter is connected to a first thermal concentration tank, a first crystallization tank, a first plate and frame filter, a spray dryer, and a protein storage tank. The permeate outlet of the nanofiltration membrane filter is sequentially connected to a second thermal concentration tank, a second crystallization tank, and a second plate and frame filter. The solid outlets of the first and second plate and frame filters are sequentially connected to a third crystallization tank, a third plate and frame filter, a drying tank, and a lactic acid storage tank. The sedimentation tank is connected to a tartaric acid solution storage tank and a sodium hydroxide solution storage tank. This device uses phytate-free corn soaking water as raw material. First, tartaric acid is used as a precipitant to remove calcium and magnesium ions from the solution under certain conditions. Then, a combination of purification methods, including nanofiltration membrane concentration and crystallization purification, is used to recover lactic acid and protein from the phytate-free corn soaking water, greatly improving economic value, and the device has a simple structure.

[0016] The precipitation tank of this device is equipped with a pH sensor, and the connecting pipe between the sodium hydroxide solution storage tank and the precipitation tank is equipped with an electric valve, which is interlocked with the pH sensor. This setup allows for precise control of the solution pH during precipitation, facilitating better separation of calcium and magnesium ions and simplifying subsequent recovery of protein and lactic acid.

[0017] The first, second, and third crystallization tanks of this device are all equipped with a stirring mechanism. The stirring mechanism includes a stirring shaft, stirring blades mounted on the stirring shaft, and a stirring motor that drives the stirring shaft to rotate. The stirring shaft also has stirring frames on both sides that abut against the first, second, and third crystallization tanks. Auxiliary stirring blades are located at the bottom of the stirring frames, abutting against the bottom of the first, second, and third crystallization tanks. The auxiliary stirring blades have multiple turbulence holes, each containing turbulence teeth. This arrangement ensures more uniform mixing of the liquid within the crystallization tanks, improving crystallization efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0020] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0021] In the diagram, 1. Ceramic membrane filter; 2. Sedimentation tank; 3. Tubular centrifuge; 4. Nanofiltration membrane filter; 5. Jacket; 6. Heat exchange medium inlet; 7. Heat exchange medium outlet; 8. First thermal concentration tank; 9. First crystallization tank; 10. First plate and frame filter press; 11. Spray dryer; 12. Protein storage tank; 13. Second thermal concentration tank; 14. Second crystallization tank; 15. Second plate and frame filter press; 16. Third crystallization tank; 17. Third plate and frame filter press; 18. Drying tank; 19. Lactic acid storage tank; 20. Tartaric acid solution storage tank; 21. Sodium hydroxide solution storage tank; 22. pH sensor; 23. Electric valve; 24. Stirring shaft; 25. Stirring blades; 26. Stirring motor; 27. Stirring frame; 28. Auxiliary stirring blades; 29. ​​Turbulence holes; 30. Turbulence teeth. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Example 1

[0024] like Figure 1 and 2 As shown, a method for separating lactic acid and protein from corn soaking water includes a ceramic membrane filter 1, a sedimentation tank 2, a tubular centrifuge 3, and a nanofiltration membrane filter 4. The sedimentation tank 2 is equipped with a jacket 5, which has a heat exchange medium inlet 6 and a heat exchange medium outlet 7. The clear liquid outlet of the tubular centrifuge 3 is connected to the nanofiltration membrane filter 4. The retentate outlet of the nanofiltration membrane filter 4 is connected to a first thermal concentration tank 8, a first crystallization tank 9, a first plate and frame filter 10, a spray dryer 11, and a protein storage tank 12. The permeate outlet of the nanofiltration membrane filter 4 is sequentially connected to a second thermal concentration tank 13, a second crystallization tank 14, and a second plate and frame filter 15. The solid outlets of the first plate and frame filter 10 and the second plate and frame filter 15 are sequentially connected to a third crystallization tank 16, a third plate and frame filter 17, a drying tank 18, and a lactic acid storage tank 19. The sedimentation tank 2 is connected to a tartaric acid solution storage tank 20 and a sodium hydroxide solution storage tank 21.

[0025] In this embodiment, a pH sensor 22 is installed inside the precipitation tank 2, and an electric valve 23 is installed on the connecting pipe between the sodium hydroxide solution storage tank 21 and the precipitation tank 2. The electric valve 23 is interlocked with the pH sensor 22. This configuration allows for precise control of the pH of the solution in the precipitation tank 2, thereby better removing calcium and magnesium ions from the solution in the precipitation tank 2.

[0026] In this embodiment, the first crystallization tank 9, the second crystallization tank 14, and the third crystallization tank 16 are all equipped with a stirring mechanism. The stirring mechanism includes a stirring shaft 24, stirring blades 25 disposed on the stirring shaft 24, and a stirring motor 26 that drives the stirring shaft 24 to rotate. The stirring mechanism makes the liquid mixture more uniform, improves heat exchange, and increases crystallization efficiency.

[0027] In this embodiment, the stirring shaft 24 is further provided with stirring frames 27 on both sides that abut against the first crystallization tank 9, the second crystallization tank 14, and the third crystallization tank 16. The stirring shaft 24 drives the stirring frames 27 to rotate, thereby scraping off the crystals adhering to the inner wall of the crystallization tank.

[0028] In this embodiment, the bottom of the stirring frame 27 is provided with auxiliary stirring blades 28, which abut against the bottoms of the first crystallization tank 9, the second crystallization tank 14, and the third crystallization tank 16. Furthermore, the auxiliary stirring blades 28 are provided with multiple turbulence holes 29; even further, the turbulence holes 29 are provided with turbulence teeth 30. The above configuration can improve the uniform mixing of the liquid in the crystallization tank and prevent sediment accumulation at the bottom of the crystallization tank from affecting the crystallization efficiency.

[0029] The process of recovering protein and lactic acid from corn soaking water using the above-mentioned device is as follows:

[0030] The phytic acid-free corn soaking water is pumped into a ceramic membrane filter 1 for filtration. The permeate enters a sedimentation tank 2, where tartaric acid solution and sodium hydroxide solution are added. Sedimentation occurs at a certain temperature. After sedimentation, the precipitate is centrifuged in a tubular centrifuge 3. The supernatant from the centrifuge enters a nanofiltration membrane filter 4 for purification. The retentate from the nanofiltration membrane filter 4 is then concentrated in a first thermal concentrator 8, crystallized in a first crystallizer 9, and filtered by a first plate and frame filter press 10. The filtered clear liquid is then dried in a spray dryer 11. After drying, the obtained protein powder enters the protein storage tank 12; the permeate from the nanofiltration membrane filter 4 is concentrated in the second thermal concentration tank 13, crystallized in the second crystallization tank 14, and filtered by the second plate and frame filter 15 in sequence; the filter cakes from the first plate and frame filter 10 and the second plate and frame filter 15 are added to the third crystallization tank 16, crystallization solvent is added, and the temperature is raised to a certain temperature for crystallization treatment. The crystallization liquid is filtered by the third plate and frame filter 17, and the filter cake is dried in the drying tank 18 to obtain lactic acid, which is temporarily stored in the lactic acid storage tank 19.

[0031] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for separating lactic acid and protein from corn soaking water, characterized in that: The system includes a ceramic membrane filter, a sedimentation tank, a tubular centrifuge, and a nanofiltration membrane filter. The retentate outlet of the nanofiltration membrane filter is connected to a first thermal concentration tank, a first crystallization tank, a first plate and frame filter, a spray dryer, and a protein storage tank. The permeate outlet of the nanofiltration membrane filter is sequentially connected to a second thermal concentration tank, a second crystallization tank, and a second plate and frame filter. The solid outlets of the first and second plate and frame filters are sequentially connected to a third crystallization tank, a third plate and frame filter, a drying tank, and a lactic acid storage tank. The sedimentation tank is connected to a tartaric acid solution storage tank and a sodium hydroxide solution storage tank.

2. The apparatus for separating lactic acid and protein in corn soaking water according to claim 1, characterized in that: The sedimentation tank is equipped with a jacket, and the jacket is provided with a heat exchange medium inlet and a heat exchange medium outlet.

3. The apparatus for separating lactic acid and protein in corn soaking water according to claim 1, characterized in that: The precipitation tank is equipped with a pH sensor, and the connecting pipe between the sodium hydroxide solution storage tank and the precipitation tank is equipped with an electric valve, which is interlocked with the pH sensor.

4. The apparatus for separating lactic acid and protein in corn soaking water according to claim 1, characterized in that: The clear liquid outlet of the tubular centrifuge is connected to the nanofiltration membrane filter.

5. The apparatus for separating lactic acid and protein in corn soaking water according to claim 1, characterized in that: The first crystallization tank, the second crystallization tank, and the third crystallization tank are all equipped with a stirring mechanism. The stirring mechanism includes a stirring shaft, stirring blades mounted on the stirring shaft, and a stirring motor that drives the stirring shaft to rotate.

6. The apparatus for separating lactic acid and protein in corn soaking water according to claim 5, characterized in that: The stirring shaft is also equipped with stirring frames on both sides that abut against the first crystallization tank, the second crystallization tank, and the third crystallization tank.

7. The apparatus for separating lactic acid and protein in corn soaking water according to claim 6, characterized in that: The bottom of the stirring frame is provided with auxiliary stirring blades, which abut against the bottom of the first crystallization tank, the second crystallization tank, and the third crystallization tank.

8. The apparatus for separating lactic acid and protein in corn soaking water according to claim 7, characterized in that: The auxiliary stirring blades are provided with multiple turbulence holes.

9. The apparatus for separating lactic acid and protein in corn soaking water according to claim 8, characterized in that: The turbulence hole is equipped with turbulence teeth.

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