Production system for separating high-purity water-soluble protein and lactic acid from corn soaking water

Abstract

The utility model relates to the technical field of corn soaking water treatment, in particular to a production system for separating high-purity water-soluble protein and lactic acid from corn soaking water. Comprising a settling tank, a plate and frame filter, a hollow fiber membrane separation device, a first resin column, a second resin column, a third resin column, a concentration kettle and an electrodialysis device which are communicated with a corn soaking water conveying pipeline, and a trapped fluid outlet of nanofiltration membrane equipment is communicated with a water-soluble protein fluid storage tank, a drying device and a protein product storage tank; a permeate outlet of the nanofiltration membrane equipment is communicated with the extraction kettle, an extract phase outlet of the extraction kettle is communicated with the distillation kettle, and a liquid outlet of the distillation kettle is communicated with the lactic acid storage tank. The production system is reasonable in design, and high-yield, high-yield and high-purity water-soluble protein products and lactic acid products can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of corn steep water treatment, in particular to a production system for separating high-purity water-soluble protein and lactic acid from corn steep water. Background Art

[0002] Corn steep water is a by-product generated during the wet production of corn starch. In addition to containing about 1% phytic acid, corn steep water also contains about 2-3% protein, about 2% lactic acid, about 1% sugars, starch residues and other organic components. At present, the existing processes disclose the recovery of phytic acid, protein and lactic acid, but the yields, purities and recovery rates of protein and lactic acid are relatively low. Therefore, in view of the above problems, it is necessary to develop a production system for separating high-purity water-soluble protein and lactic acid from corn steep water. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: aiming at the deficiencies of the prior art, to provide a production system for separating high-purity water-soluble protein and lactic acid from corn steep water, and high-purity and high-yield water-soluble protein and lactic acid products can be obtained by using this production system.

[0004] To solve the above technical problem, the technical solution of the utility model is:

[0005] A production system for separating high-purity water-soluble protein and lactic acid from corn steep water includes a sedimentation tank connected to a corn steep water conveying pipeline. The overflow port of the sedimentation tank is connected to a plate and frame filter. The liquid outlet of the plate and frame filter is connected to a hollow fiber membrane separation device. The permeate outlet of the hollow fiber membrane separation device is connected to a first resin column. The liquid outlet of the first resin column is connected to a second resin column. The liquid outlet of the second resin column is connected to a third resin column. The liquid outlet of the third resin column is connected to a concentration kettle. The concentrated liquid outlet of the concentration kettle is connected to an electrodialysis device. The desalinated liquid material outlet of the electrodialysis device is connected to a nanofiltration membrane device. The retentate outlet of the nanofiltration membrane device is connected to a water-soluble protein liquid storage tank. The water-soluble protein liquid storage tank is connected to a drying device. The discharge outlet of the drying device is connected to a protein product storage tank. The permeate outlet of the nanofiltration membrane device is connected to an extraction kettle. The extraction phase outlet of the extraction kettle is connected to a distillation kettle. The liquid outlet of the distillation kettle is connected to a lactic acid storage tank.

[0006] As an improved technical solution, the sedimentation tank includes a tank body. The top of the tank body is provided with a feed inlet. One side in the middle of the tank body is provided with an overflow port. The bottom of the tank body is provided with a sediment outlet. A filter screen is arranged at a position corresponding to the overflow port on the inner wall of the tank body.

[0007] As an improved technical solution, the filter cloth aperture of the plate and frame filter is 500-600 mesh.

[0008] As an improved technical solution, the filler in the first resin column is chelating resin, the filler in the second resin column is weakly basic epoxy-based anion exchange resin, and the filler in the third resin column is macroporous adsorption resin.

[0009] As an improved technical solution, the concentration kettle includes a kettle body. The top of the kettle body is provided with a feed inlet and a vent port. The bottom of the kettle body is provided with a concentrated liquid outlet. The outside of the kettle body is provided with a jacket. The inside of the kettle body is provided with a stirring shaft. One end of the stirring shaft is connected to a motor. The stirring shaft is provided with a stirring frame, and the stirring frame is provided with a plurality of stirring rods.

[0010] As an improved technical solution, the extraction kettle includes a kettle body. The top of the kettle body is provided with a feed inlet and an extractant inlet. The bottom of the kettle body is provided with a discharge outlet. The inside of the kettle body is provided with a stirring shaft. One end of the stirring shaft is connected to a motor. The stirring shaft is provided with a plurality of stirring rods. A sight glass is provided on the outer wall of the kettle body.

[0011] As an improved technical solution, the distillation kettle includes a kettle body. The top of the kettle body is provided with a feed inlet and a vent port. The bottom of the kettle body is provided with a liquid outlet. The outside of the kettle body is provided with a jacket. The inside of the kettle body is provided with a stirring shaft. One end of the stirring shaft is connected to a motor. The stirring shaft is provided with multiple layers of stirring plates, and the stirring plates are provided with a plurality of through holes.

[0012] After adopting the above technical solution, the beneficial effects of the present utility model are:

[0013] A production system for separating highly pure water-soluble protein and lactic acid from corn steep water includes a settling tank connected to a corn steep water conveying pipeline. The overflow port of the settling tank is connected to a plate and frame filter press. The liquid outlet of the plate and frame filter press is connected to a hollow fiber membrane separation device. The permeate outlet of the hollow fiber membrane separation device is connected to a first resin column. The liquid outlet of the first resin column is connected to a second resin column. The liquid outlet of the second resin column is connected to a third resin column. The liquid outlet of the third resin column is connected to a concentration kettle. The concentrated liquid outlet of the concentration kettle is connected to an electrodialysis device. The desalted liquid material outlet of the electrodialysis device is connected to a nanofiltration membrane device. The retentate outlet of the nanofiltration membrane device is connected to a water-soluble protein liquid storage tank. The water-soluble protein liquid storage tank is connected to a drying device. The discharge outlet of the drying device is connected to a protein product storage tank. The permeate outlet of the nanofiltration membrane device is connected to an extraction kettle. The extraction phase outlet of the extraction kettle is connected to a distillation kettle. The liquid outlet of the distillation kettle is connected to a lactic acid storage tank. In actual production, corn steep water enters the interior of the settling tank along the corn steep water conveying pipeline. The supernatant after static settlement flows out from the overflow port along the pipeline into the plate and frame filter press. The filtrate after pressure filtration flows into the hollow fiber membrane separation device along the pipeline. The collected permeate enters the first resin column, the second resin column, and the third resin column connected in series in sequence. The collected effluent flows into the concentration kettle along the pipeline. The concentrated liquid after concentration flows into the electrodialysis device along the pipeline. The treated desalted liquid material flows into the nanofiltration membrane device along the pipeline for treatment. The collected retentate (water-soluble protein liquid) enters the water-soluble protein liquid storage tank, and then flows into the interior of the drying device along the pipeline. Finally, it is stored in the protein product storage tank. The collected permeate enters the extraction kettle. The extraction phase collected after extraction with an extraction agent enters the distillation kettle. The organic solvent is removed after distillation, and the remaining liquid (lactic acid) is stored in the lactic acid storage tank. The above production system is reasonably designed and can obtain water-soluble protein products and lactic acid products with high yield, high recovery rate, and high purity.

[0014] Since the settling tank includes a tank body, the top of the tank body is provided with a feed inlet, one side of the middle part of the tank body is provided with an overflow port, the bottom of the tank body is provided with a sediment outlet, and a filter screen is provided at a position corresponding to the overflow port on the inner wall of the tank body. Corn steep water enters the interior of the settling tank from the feed inlet. The supernatant after static settlement passes through the filter screen and flows out from the overflow port. The settling tank with the above structure is reasonably designed and effectively settles the insoluble substances in corn steep water.

[0015] Since the filter cloth aperture of the plate and frame filter press is 500 - 600 mesh. Using the above equipment can effectively remove the insoluble substances in the supernatant.

[0016] Since the filler in the first resin column is chelating resin, the filler in the second resin column is weakly basic epoxy-based anion exchange resin, and the filler in the third resin column is macroporous adsorption resin. The filtrate enters the first resin column, and metal ions can be adsorbed through the chelating resin; when it enters the second resin column, phytic acid can be adsorbed through the weakly basic epoxy-based anion exchange resin, and pigments can be adsorbed through the macroporous adsorption resin; through the coordinated treatment of the first, second, and third resin columns, the purity of water-soluble protein and lactic acid can be improved.

[0017] Since the concentration kettle includes a kettle body, a feed inlet and a vent port are provided at the top of the kettle body, a concentrated liquid outlet is provided at the bottom of the kettle body, a jacket is provided outside the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, a stirring frame is provided on the stirring shaft, and a plurality of stirring rods are provided on the stirring frame. The effluent enters the inside of the concentration kettle and is heated by the heat medium in the jacket. After the motor is started, it drives the stirring shaft to rotate, and the stirring frame and the plurality of stirring rods stir and mix the liquid material inside the kettle body, so that the liquid material is heated evenly.

[0018] Since the extraction kettle includes a kettle body, a feed inlet and an extractant inlet are provided at the top of the kettle body, a discharge port is provided at the bottom of the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, a plurality of stirring rods are provided on the stirring shaft, and a sight glass is provided on the outer wall of the kettle body. The permeate and the extractant enter from the feed inlet respectively. After the motor is started, it drives the stirring shaft and the plurality of stirring rods to rotate, promoting the full contact of the permeate and the extractant. After standing and separating, through the sight glass observation, the extracted organic phase is collected. The above extraction kettle is reasonably designed and realizes the effective extraction of lactic acid.

[0019] Since the distillation kettle includes a kettle body, a feed inlet and a vent port are provided at the top of the kettle body, a liquid outlet is provided at the bottom of the kettle body, a jacket is provided outside the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, and multiple layers of stirring plates are provided on the stirring shaft, and a plurality of through holes are provided on the stirring plates. The extraction phase enters the inside of the kettle body from the feed inlet, and the extraction phase is heated by the heat medium in the jacket. After the motor is started, it drives the stirring shaft and the plurality of stirring plates to stir the extraction phase, so that it is heated evenly. After the organic solvent in the extraction phase is evaporated and discharged from the vent port, it is recovered by condensation; the remaining lactic acid in the distillation kettle is stored in a lactic acid storage tank. The above distillation kettle is reasonably designed, can discharge the organic solvent in lactic acid, and realizes the collection of lactic acid. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a production system for separating high-purity water-soluble protein and lactic acid from corn steep water according to the present utility model;

[0021] Among them, 1 - corn steep water conveying pipeline, 2 - settling tank, 3 - plate and frame filter press, 4 - hollow fiber membrane separation device, 5 - first resin column, 6 - second resin column, 7 - third resin column, 8 - concentrator, 9 - electrodialysis device, 10 - nanofiltration membrane equipment, 11 - water-soluble protein solution storage tank, 12 - drying device, 13 - protein product storage tank, 14 - extraction kettle, 15 - distillation kettle, 16 - lactic acid storage tank. Detailed implementation mode

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following further elaborates on the present utility model in conjunction with the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0023] A production system for separating high-purity water-soluble protein and lactic acid from corn steep water, as Figure 1 shown, includes a settling tank 2 connected to the corn steep water conveying pipeline 1. The overflow port of the settling tank 2 is connected to a plate and frame filter press 3 (the filter cloth aperture is 500 - 600 mesh). The liquid outlet of the plate and frame filter press 3 is connected to a hollow fiber membrane separation device (purchased from a manufacturer) 4. The permeate outlet of the hollow fiber membrane separation device 4 is connected to a first resin column 5. The liquid outlet of the first resin column 5 is connected to a second resin column 6. The liquid outlet of the second resin column 6 is connected to a third resin column 7. The liquid outlet of the third resin column 7 is connected to a concentrator 8. The concentrated liquid outlet of the concentrator 8 is connected to an electrodialysis device 9 (purchased from a manufacturer). The desalted liquid material outlet of the electrodialysis device 9 is connected to a nanofiltration membrane equipment 10. The retentate outlet of the nanofiltration membrane equipment 10 is connected to a water-soluble protein solution storage tank 11. The water-soluble protein solution storage tank 11 is connected to a drying device 12 (double-cone dryer). The discharge port of the drying device 12 is connected to a protein product storage tank 13; the permeate outlet of the nanofiltration membrane equipment 10 is connected to an extraction kettle 14. The extraction phase outlet of the extraction kettle 14 is connected to a distillation kettle 15. The liquid outlet of the distillation kettle 15 is connected to a lactic acid storage tank 16.

[0024] In actual production, corn steep water enters the inside of a sedimentation tank along a corn steep water conveying pipeline. The supernatant after static sedimentation flows into a plate and frame filter press along a pipeline from an overflow port. The filtrate after pressure filtration flows into a hollow fiber membrane separation device along a pipeline. The collected permeate successively enters a first resin column, a second resin column, and a third resin column connected in series. The collected effluent flows into a concentration kettle along a pipeline. The concentrated liquid after concentration flows into an electrodialysis device along a pipeline. The desalted liquid material after treatment flows into a nanofiltration membrane device along a pipeline for treatment. The collected retentate (water-soluble protein solution) enters a water-soluble protein solution storage tank, then flows into the inside of a drying device along a pipeline, and finally is stored in a protein product storage tank; the collected permeate enters an extraction kettle. The extraction phase collected after extraction with an extractant enters a distillation kettle. Organic solvents are removed after distillation, and the remaining liquid (lactic acid) is stored in a lactic acid storage tank. The above production system is reasonably designed and can obtain water-soluble protein products and lactic acid products with high yield, high recovery rate, and high purity.

[0025] The sedimentation tank 2 includes a tank body. An inlet is provided at the top of the tank body, an overflow port is provided on one side in the middle of the tank body, a sediment outlet is provided at the bottom of the tank body, and a filter screen is provided at a position on the inner wall of the tank body corresponding to the overflow port. Corn steep water enters the inside of the sedimentation tank from the inlet, and the supernatant after static sedimentation flows out from the overflow port through the filter screen. The sedimentation tank with the above structure is reasonably designed and effectively settles the insoluble substances in corn steep water.

[0026] The packing in the first resin column 5 is chelating resin, the packing in the second resin column 6 is weakly basic epoxy-based anion exchange resin, and the packing in the third resin column 7 is macroporous adsorption resin. The filtrate enters the first resin column, and metal ions can be adsorbed through the chelating resin; when it enters the second resin column, phytic acid can be adsorbed through the weakly basic epoxy-based anion exchange resin, and pigments can be adsorbed through the macroporous adsorption resin; through the coordinated treatment of the first, second, and third resin columns, the purity of water-soluble protein and lactic acid can be improved.

[0027] The concentration kettle 8 includes a kettle body. An inlet and a vent are provided at the top of the kettle body, a concentrated liquid outlet is provided at the bottom of the kettle body, a jacket is provided outside the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, a stirring frame is provided on the stirring shaft, and a plurality of stirring rods are provided on the stirring frame. The effluent enters the inside of the concentration kettle and is heated by the heat medium in the jacket. After the motor starts, it drives the stirring shaft to rotate, and the stirring frame and the plurality of stirring rods stir and mix the liquid material inside the kettle body, making the liquid material evenly heated.

[0028] Among them, the extraction kettle 14 includes a kettle body. The top of the kettle body is provided with a feed inlet and an extractant inlet. The bottom of the kettle body is provided with a discharge outlet. A stirring shaft is arranged inside the kettle body. One end of the stirring shaft is connected to a motor. A plurality of stirring rods are arranged on the stirring shaft. A sight glass is arranged on the outer wall of the kettle body. The permeate and the extractant enter through the feed inlet respectively. After the motor is started, it drives the stirring shaft and a plurality of stirring rods to rotate, promoting the full contact between the permeate and the extractant. After standing and separating, through observing with the sight glass, the extracted organic phase is collected. The above extraction kettle is reasonably designed, realizing the effective extraction of lactic acid.

[0029] Among them, the distillation kettle 15 includes a kettle body. The top of the kettle body is provided with a feed inlet and a vent port. The bottom of the kettle body is provided with a liquid outlet. A jacket is arranged outside the kettle body. A stirring shaft is arranged inside the kettle body. One end of the stirring shaft is connected to a motor. Multiple layers of stirring plates are arranged on the stirring shaft. A plurality of through holes are arranged on the stirring plates. The extraction phase enters the inside of the kettle body through the feed inlet. The extraction phase is heated by the heat medium in the jacket. After the motor is started, it drives the stirring shaft and a plurality of stirring plates to stir the extraction phase, making it evenly heated. The organic solvent in the extraction phase evaporates due to heat and is discharged from the vent port and then recovered through condensation. The remaining lactic acid in the distillation kettle is stored in a lactic acid storage tank. The above distillation kettle is reasonably designed, which can discharge the organic solvent in the lactic acid and realize the collection of lactic acid.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production system for separating high-purity water-soluble protein and lactic acid from corn soaking water, characterized in that: The invention comprises a settling tank connected to a corn soaking water delivery pipeline, wherein the overflow port of the settling tank is connected to a plate and frame filter, the liquid outlet of the plate and frame filter is connected to a hollow fiber membrane separation device, the permeate outlet of the hollow fiber membrane separation device is connected to a first resin column, the liquid outlet of the first resin column is connected to a second resin column, the liquid outlet of the second resin column is connected to a third resin column, the liquid outlet of the third resin column is connected to a concentration kettle, the concentrated liquid outlet of the concentration kettle is connected to an electrodialysis device, the desalinated liquid material outlet of the electrodialysis device is connected to a nanofiltration membrane device, the retentate outlet of the nanofiltration membrane device is connected to a water-soluble protein liquid storage tank, the water-soluble protein liquid storage tank is connected to a drying device, the material outlet of the drying device is connected to a protein product storage tank; the permeate outlet of the nanofiltration membrane device is connected to an extraction kettle, the extracted phase outlet of the extraction kettle is connected to a distillation kettle, and the liquid outlet of the distillation kettle is connected to a lactic acid storage tank.

2. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The sedimentation tank includes a tank body, a feed port is provided on the top of the tank body, an overflow port is provided on one side of the middle of the tank body, a sediment outlet is provided at the bottom of the tank body, and a filter is provided at a position on the inner wall of the tank body corresponding to the overflow port.

3. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The filter cloth aperture of the plate and frame filter is 500-600 meshes.

4. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The filler in the first resin column is a chelating resin, the filler in the second resin column is a weakly basic epoxy anion exchange resin, and the filler in the third resin column is a macroporous adsorption resin.

5. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The concentration kettle includes a kettle body, a feed port and an emptying port are provided on the top of the kettle body, a concentrated liquid outlet is provided on the bottom of the kettle body, a jacket is provided on the outside of the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, a stirring frame is provided on the stirring shaft, and a plurality of stirring rods are provided on the stirring frame.

6. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The extraction kettle includes a kettle body, a feed port and an extractant inlet are provided on the top of the kettle body, a discharge port is provided on the bottom of the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, a plurality of stirring rods are provided on the stirring shaft, and a sight glass is provided on the outer wall of the kettle body.

7. The production system for separating high-purity water-soluble protein and lactic acid from corn soaking water according to claim 1, characterized in that: The distillation kettle includes a kettle body, a feed port and an emptying port are provided on the top of the kettle body, a liquid outlet is provided on the bottom of the kettle body, a jacket is provided on the outside of the kettle body, a stirring shaft is provided inside the kettle body, one end of the stirring shaft is connected to a motor, and a multi-layer stirring plate is provided on the stirring shaft, and a plurality of through holes are provided on the stirring plate.

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