Method for preparing potassium phytate from corn soaking water

Abstract

The invention discloses a method for preparing potassium phytate from corn soaking water, and belongs to the technical field of potassium phytate preparation. Comprising the following steps: filtering corn soaking water through a ceramic membrane to obtain a first trapped fluid and a first permeated fluid; concentrating the first permeate by using a reverse osmosis membrane to obtain a second trapped fluid and a second permeate; separating the second trapped fluid by adopting simulated moving bed chromatography, and collecting a first organic phase and a first salt phase; after the first organic phase is adsorbed by anion exchange resin, a KCl solution with the first concentration and a KCl solution with the second concentration are adopted for continuous desorption, a first desorption solution and a second desorption solution are obtained respectively, and the first concentration of the KCl solution is lower than the second concentration of the KCl solution; concentrating the second desorption solution by using a nanofiltration membrane to obtain a third trapped fluid and a third permeate; and separating the third trapped fluid by adopting a simulated moving bed chromatographic separation technology, collecting a second organic phase and a second salt phase, and concentrating the second organic phase through a reverse osmosis membrane to obtain a high-purity potassium phytate product. According to the method, the potassium phytate product with the content greater than or equal to 99 wt% can be obtained from the corn soaking water.

Description

Technical Field

[0001] The invention relates to the technical field of potassium phytate preparation, and in particular to a method for preparing potassium phytate by using corn soaking water. Background Art

[0002] As an important food, medicine, chemical raw material and fertilizer additive, potassium phytate has broad application prospects in many fields such as food, medicine, and agriculture. Traditional preparation of potassium phytate is often accompanied by environmental pollution and waste of resources. Especially when extracting potassium phytate from byproducts of grain processing such as corn, traditional treatment methods can only extract products of lower purity, and the remaining waste liquid is difficult to effectively treat, resulting in serious waste of resources and environmental pollution.

[0003] Patent CN 117447512 A discloses a method for producing potassium phytate using corn soaking water as raw material. The corn soaking water is subjected to sedimentation, adsorption, and analysis to obtain an analytical solution, and then organic impurities are removed by enzymatic hydrolysis and membrane filtration. In addition, high-quality potassium phytate products are obtained by processes such as decolorization and organic solvent crystallization. Although this process can obtain high-quality potassium phytate products, enzymatic removal of impurities and the use of organic solvents are required, which increases the manufacturing cost of the product. In addition, this patent does not consider the recovery of by-products, resulting in a waste of resources. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a method for preparing potassium phytate by using corn soaking water, so as to overcome the problems of low purity of potassium phytate and waste of resources in the prior art of extracting potassium phytate from corn soaking water.

[0005] In a first aspect, an embodiment of the present invention provides a method for preparing potassium phytate by using corn soaking water, comprising the following steps:

[0006] The corn soaking water is filtered through a ceramic membrane with a pore size of 20 to 50 nm to obtain a first retentate and a first permeate;

[0007] The first permeate is concentrated by a reverse osmosis membrane to a solid content of 20 to 40 wt % to obtain a second retentate and a second permeate;

[0008] Separating the second retentate by simulated moving bed chromatography to collect a first organic phase and a first salt phase;

[0009] After the first organic phase is adsorbed by an anion exchange resin, a first concentration of KCl solution and a second concentration of KCl solution are used for continuous analysis, wherein the first concentration of KCl solution is used to obtain a first analysis solution, and the second concentration of KCl solution is used to obtain a second analysis solution, and the first concentration of the KCl solution is lower than the second concentration;

[0010] The second analytical solution is concentrated using a 200-400Da nanofiltration membrane to a solid content of 20-40wt%, to obtain a third retentate and a third permeate;

[0011] The third retentate is separated by using a simulated moving bed chromatography separation technique to collect a second organic phase and a second salt phase, wherein the simulated moving bed resin particles have a particle size of 220 to 320 um;

[0012] The second organic phase is concentrated to a solid content of 20-30 wt % by reverse osmosis membrane to obtain a potassium phytate product.

[0013] Furthermore, the first analytical solution is concentrated by a reverse osmosis membrane to a solid content of 30-50 wt % to obtain a fourth retentate and a fourth permeate, wherein the fourth permeate is used as chromatography water and the fourth retentate is used as organic fertilizer.

[0014] Further, the second salt phase is concentrated through a reverse osmosis membrane to a solid content of 2-3 wt % to obtain a fifth retentate and a fifth permeate, the fifth permeate is used for chromatography water, and the fifth retentate is used for resolving the resin with a KCl solution of the first concentration; or,

[0015] The third permeate is used to prepare a KCl solution of a second concentration.

[0016] Furthermore, the operating temperature of the reverse osmosis membrane is 30-65° C., and the membrane pressure is 3.0-6.0 MPa.

[0017] Furthermore, the first concentration of the KCl solution is 2-3 wt %. During analysis, the loading speed is 1.0-3.0 BV / h, and the loading amount is 2.0-4.0 BV of the resin volume.

[0018] Furthermore, the second concentration of the KCl solution is 8-15 wt %. During analysis, the loading speed is 1.0-2.0 BV / h, and the loading amount is 1.5-2.5 BV of the resin volume.

[0019] Furthermore, the simulated moving bed resin model used in the second retentate is Lanxiao Technology S1850 potassium-type resin, and the particle size of the resin particles is 220 to 320 um.

[0020] Furthermore, the simulated moving bed resin model used in the third retentate is Lanxiao Technology S1850 calcium type resin, and the particle size of the resin particles is 220-320 um.

[0021] Furthermore, the effluent of the first organic phase after adsorption by anion exchange resin is concentrated to a solid content of 40-50wt% through a reverse osmosis membrane, and dried to obtain a protein product with a protein content of >60%.

[0022] Furthermore, after the first organic phase is adsorbed by the anion exchange resin, 0.5-2BV purified water is used to top the anion exchange resin, and the top water liquid is combined with the effluent.

[0023] Beneficial effects:

[0024] (1) Compared with the prior art, the present invention can obtain a high-content potassium phytate product from corn soaking water, and the content of potassium phytate is ≥99wt%;

[0025] (2) While obtaining the potassium phytate product, a highly stable protein product is obtained, with a protein content of more than 60%.

[0026] (3) In addition to potassium phytate and protein products, organic fertilizer can also be obtained, which can increase the added value of the product.

[0027] (4) This process is simple and has a smooth flow. It is suitable for obtaining various products from corn soaking water and is conducive to the comprehensive utilization of raw materials. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] As an important food, medicine, chemical raw material and fertilizer additive, potassium phytate has broad application prospects in many fields such as food, medicine, and agriculture. Traditional preparation of potassium phytate is often accompanied by environmental pollution and waste of resources. Especially when extracting potassium phytate from byproducts of grain processing such as corn, traditional treatment methods can only extract products of lower purity, and the remaining waste liquid does not consider the recovery of byproducts, resulting in serious waste of resources and environmental pollution.

[0030] Based on the above background, the present invention proposes a process for preparing high-quality potassium phytate from corn soaking water. The method combines the use of ceramic membranes, reverse osmosis membranes, nanofiltration membranes, simulated moving beds, ion exchange resins and other advanced technologies to not only achieve efficient extraction and purification of potassium phytate from corn soaking water, but also achieve the preparation of by-product protein feed and organic fertilizer, thereby significantly improving resource utilization efficiency and product added value.

[0031] In a first aspect, the present invention provides a method for preparing potassium phytate by using corn soaking water, comprising the following steps:

[0032] S1. Corn soaking water is filtered through a ceramic membrane with a pore size of 20-50 nm to obtain a first retentate and a first permeate.

[0033] It should be understood that in this step, the ceramic membrane filtration operating pressure is 0.3-0.6 MPa, the operating temperature is 40-60°C, the feed liquid retention rate is 3-5%, and the first retentate is mainly corn starch, which can be used as a feed additive.

[0034] S2. Concentrating the first permeate using a reverse osmosis membrane to a solid content of 20-40 wt % to obtain a second retentate and a second permeate.

[0035] It should be understood that in this step, the operating temperature of the reverse osmosis membrane can be 30-65°C, and the membrane pressure can be selected to be 3.0-6.0MPa. At this temperature and operating pressure, the first permeate can be well concentrated. In addition, the second permeate concentrated by the reverse osmosis membrane can be used to simulate the water use of the moving bed, realize resource recycling, and reduce water costs.

[0036] S3. Separating the second retentate by simulated moving bed chromatography to collect the first organic phase and the first salt phase.

[0037] It should be understood that in this step, the simulated moving bed resin model can be selected as Lanxiao Technology S1850 potassium-type resin, and the resin particle size is 220-320um. By selecting a specific resin model and resin particle size, a specific separation effect can be achieved, so that the first organic phase containing potassium phytate and the first salt phase containing K ions, Ca ions, Mg ions, sulfate ions, etc. are well separated, and the first salt phase is mainly used for external discharge.

[0038] S4. After the first organic phase is adsorbed by an anion exchange resin, a first concentration KCl solution and a second concentration KCl solution are used for continuous analysis, respectively, wherein a first analysis solution is obtained after analysis with the first concentration KCl solution, and a second analysis solution is obtained after analysis with the second concentration KCl solution, and the first concentration of the KCl solution is lower than the second concentration.

[0039] In this step, the first concentration of the KCl solution can be selected as 2-3wt%, and the second concentration of the KCl solution can be selected as 8-15wt%. The first concentration of the potassium chloride solution is low. When analyzing, the impurities such as protein and lactic acid weakly adsorbed on the anion exchange resin can be analyzed first to obtain the first analytical solution. The second concentration of KCl solution continues to analyze the anion exchange resin, and a second analytical solution with a main content of potassium phytate can be obtained. For example, the anion exchange resin can be selected as Hebei Lijiang 201×7 resin, Xi'an Lanxiao LX-360 resin, Purolite A600MB resin, etc.

[0040] In addition, it should be understood that the effluent after adsorption by the anion resin is reserved for use. After the adsorption is completed, 0.5-2BV of purified water top resin can be used, and the water top liquid is combined with the effluent.

[0041] In this step, when the first concentration of KCl solution is analyzed, the loading speed is 1.0-3.0 BV / h, and the loading amount is 2.0-4.0 BV of the resin volume. When the second concentration of KCl solution is analyzed, the loading speed is 1.0-2.0 BV / h, and the loading amount is 1.5-2.5 BV of the resin volume.

[0042] S5. Concentrate the second analytical solution using a 200-400Da nanofiltration membrane to a solid content of 20-40wt%, to obtain a third retentate and a third permeate.

[0043] In this step, the operating temperature of the nanofiltration membrane during concentration can be 30-55°C, and the membrane pressure can be selected to be 2.5-4.5MPa. Through nanofiltration membrane concentration, most of the potassium chloride contained in the second analytical solution can be removed. At this time, the concentration of potassium chloride in the third permeate obtained is relatively high, which can be used to prepare a potassium chloride solution of the second concentration and recycled. The third retentate is a further concentrated potassium phytate solution.

[0044] S6. Separate the third retentate using simulated moving bed chromatography separation technology to collect the second organic phase and the second salt phase.

[0045] In this step, the simulated moving bed resin model used in the third retentate is Lanxiao Technology S1850 calcium type resin, and the resin particle size is 220-320um. It should be understood that the second salt phase contained in the third retentate is mainly monovalent salt and divalent salt, and the monovalent salt and divalent salt will flow to the salt phase in the simulated moving bed resin at the same time, and potassium phytate flows to the organic phase in the simulated moving bed resin. According to the difference in fluidity between the organic phase and the salt phase in the stationary phase and the mobile phase, the effective separation of the second organic phase and the second salt phase can be achieved. In addition, since there is a very small amount of calcium in potassium phytate, it will affect the later treatment of potassium phytate. In order to better separate calcium salt from potassium phytate, S1850 calcium type resin is used here, which can separate monovalent salt, that is, potassium chloride, while better separating divalent calcium salt from potassium phytate, so that the calcium content in the potassium phytate solution in the second organic phase is reduced as much as possible. At this time, the second organic phase obtained is the potassium phytate solution after further purification.

[0046] S7. The second organic phase is concentrated to a solid content of 20-30 wt % through a reverse osmosis membrane to obtain a potassium phytate product.

[0047] In this step, the operating temperature of the reverse osmosis membrane is 30-65°C, and the membrane pressure is 3.0-6.0 MPa.

[0048] In the above technical scheme, corn soaking water is first filtered through a ceramic membrane to remove macromolecular impurities such as corn starch, which can be used as a main component of the first retentate and can be used as a feed additive. The first permeate is then concentrated through a reverse osmosis membrane. The volume of the treatment liquid used for subsequent simulated moving bed chromatography separation can be reduced by concentration, and the separation efficiency of simulated moving bed chromatography separation can be improved. In the simulated moving bed chromatography separation treatment step, the second retentate can achieve effective separation of the organic phase and the salt phase according to the difference in fluidity between the stationary phase and the mobile phase, and the first organic phase and the first salt phase are collected respectively. The first salt phase mainly contains K ions, Ca ions, Mg ions, sulfate ions, etc., and its main treatment method is efflux. The first organic phase is further adsorbed by anion exchange resin. First, low-concentration potassium chloride is used to parse the anion exchange resin. The main purpose is to parse impurities such as protein and lactic acid weakly adsorbed by the resin; then high-concentration potassium chloride is used to continue to parse the anion exchange resin, and a high-content potassium phytate product can be obtained at this time. The second analytical solution is further concentrated through a nanofiltration membrane to further remove KCl contained in potassium phytate. The obtained third retentate is separated by a mobile chromatographic bed to further separate the second salt phase remaining in the potassium phytate from the second organic phase, wherein the second organic phase is mainly a high-purity potassium phytate product, and the second salt phase is the remaining calcium, magnesium, potassium, chlorine, and sulfate ions. After the above separation steps, the second organic phase is concentrated to finally obtain a high-purity and high-quality potassium phytate product.

[0049] In combination with the above embodiment, in the embodiment of the present invention, the first analytical solution obtained in step S4 is further concentrated by a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30-65°C, the membrane pressure is 3.0-6.0Mpa, and the solid content is concentrated to 30-50wt%, thereby obtaining a fourth retentate and a fourth permeate. Since the first analytical solution mainly contains organic substances such as protein and lactic acid, the fourth retentate obtained after the first analytical solution is concentrated can be used as an organic fertilizer, which can further increase the added value of the product, and the fourth permeate is used for chromatography water.

[0050] Further, in combination with the above embodiment, the embodiment of the present invention also provides a further processing method for the second salt phase obtained in step S6. The second salt phase is concentrated by a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30-65°C, the membrane pressure is 3.0-6.0Mpa, and it is concentrated to a solid content of 2-3wt%, and a fifth retentate and a fifth permeate are obtained. Since the main content of the second salt phase is still potassium chloride, the fifth permeate after the second salt phase is concentrated by the reverse osmosis membrane is used for chromatography water, and the fifth retentate can be used for the first concentration of KCl solution to resolve the resin.

[0051] Furthermore, in combination with the above embodiment, the embodiment of the present invention further processes the effluent obtained in step S1, that is, the effluent after the first organic phase is adsorbed by an anion exchange resin, and the effluent is concentrated to a solid content of 40-50wt% through a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30-65°C, and the membrane pressure is 3.0-6.0Mpa. After drying, a protein product with a protein content of >60% can be obtained. By obtaining a protein product, the added value of the product can be further increased.

[0052] In order to better illustrate the technical solution of the present invention, the present invention also provides the following specific examples. It should be understood that the raw materials used in the following examples are all commercially available raw materials unless otherwise specified.

[0053] Example 1

[0054] This embodiment provides a method for preparing potassium phytate by using corn soaking water, comprising the following steps:

[0055] S1, corn soaking water is filtered through a ceramic membrane with a pore size of 20nm, the operating pressure is 0.3MPa, the operating temperature is 60℃, the feed liquid retention rate is 3%, and the first retentate and the first permeate are obtained;

[0056] S2, concentrating the first permeate using a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30° C., the membrane pressure is 3.0 MPa, and concentrating to a solid content of 20 wt %, to obtain a second retentate and a second permeate;

[0057] S3, the second retentate is separated by simulated moving bed chromatography, the simulated moving bed resin model is Lanxiao Technology S1850 potassium type resin, the resin particle size is 220-240um, the flow rate of the mobile phase is set to 1.5BV / h, the switching time of the chromatographic column is 20.8min, and the first organic phase and the first salt phase are collected;

[0058] S4, after the first organic phase is adsorbed by an anion exchange resin, a 2wt% KCl solution and an 8wt% KCl solution are used for continuous analysis, wherein the loading speed of the first organic phase is 1BV / h, and the loading amount is 8BV of the resin volume; the loading speed of the 2wt% KCl solution is 1.0BV / h, and the loading amount is 2.0BV of the resin volume, and the first analysis solution is obtained after analysis; the loading speed of the 8wt% KCl solution is 1.0BV / h, and the loading amount is 1.5BV of the resin volume, and the second analysis solution is obtained after analysis;

[0059] S5, concentrating the second analytical solution using a 200Da nanofiltration membrane, during concentration, the operating temperature can be 30°C, the membrane pressure can be selected to be 4.5MPa, and concentrating to a solid content of 20wt%, to obtain a third retentate and a third permeate;

[0060] S6, separating the third retentate by simulated moving bed chromatography separation technology, the simulated moving bed resin model is Lanxiao Technology S1850 calcium type resin, the resin particle size is 220-240um, the flow rate of the mobile phase is set to 1.0BV / h, the switching time of the chromatographic column is 25.4min, and the second organic phase and the second salt phase are collected;

[0061] S7, the second organic phase is concentrated by reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30°C, the membrane pressure is 3.0Mpa, and the solid content is concentrated to 20wt%, and potassium phytate product is obtained. The purity of potassium phytate is 99.6wt%, and the yield is 95.1%.

[0062] Example 2

[0063] This embodiment provides a method for preparing potassium phytate by using corn soaking water, comprising the following steps:

[0064] S1, corn soaking water is filtered through a ceramic membrane with a pore size of 50nm, the operating pressure of the ceramic membrane is 0.6MPa, the operating temperature is 40°C, and the feed liquid retention rate is 5%, and the first retained liquid and the first permeate are obtained;

[0065] S2, concentrating the first permeate using a reverse osmosis membrane, wherein the operating temperature of the reverse osmosis membrane is 65° C. and the membrane pressure is 4.5 MPa, and concentrating the first permeate to a solid content of 30 wt %, to obtain a second retentate and a second permeate;

[0066] S3, the second retentate is separated by simulated moving bed chromatography, the simulated moving bed resin model is Lanxiao Technology S1850 potassium type resin, the resin particle size is 260-280um, the flow rate of the mobile phase is set to 1.3BV / h, the switching time of the chromatographic column is 24.0min, and the first organic phase and the first salt phase are collected;

[0067] S4, after the first organic phase is adsorbed by an anion exchange resin, a 2.5wt% KCl solution and a 11wt% KCl solution are used for continuous analysis, wherein the loading speed of the first organic phase is 3BV / h, and the loading amount is 12BV of the resin volume; the loading speed of the 2.5wt% KCl solution is 2.0BV / h, and the loading amount is 3.0BV of the resin volume, and the first analysis solution is obtained after analysis; the loading speed of the 11wt% KCl solution is 1.5BV / h, and the loading amount is 2.0BV of the resin volume, and the second analysis solution is obtained after analysis;

[0068] S5, concentrating the second analytical solution using a 300Da nanofiltration membrane. During concentration, the operating temperature of the nanofiltration membrane can be 55°C, and the membrane pressure can be selected to be 2.5MPa. Concentrating to a solid content of 30wt%, obtaining a third retentate and a third permeate;

[0069] S6, separating the third retentate by simulated moving bed chromatography separation technology, the simulated moving bed resin model is Lanxiao Technology S1850 calcium type resin, the resin particle size is 280-300um, the flow rate of the mobile phase is set to 1.2BV / h, the switching time of the chromatographic column is 21.2min, and the second organic phase and the second salt phase are collected;

[0070] S7, the second organic phase is concentrated by reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 45°C, the membrane pressure is 4.5Mpa, and the solid content is concentrated to 25wt%, thereby obtaining potassium phytate product. The purity of potassium phytate is 99.5wt%, and the yield is 94.7%.

[0071] Example 3

[0072] This embodiment provides a method for preparing potassium phytate by using corn soaking water, comprising the following steps:

[0073] S1, corn soaking water is filtered through a ceramic membrane with a pore size of 20 nm, the operating pressure of the ceramic membrane is 0.5 MPa, the operating temperature is 50°C, and the feed liquid retention rate is 4%, to obtain a first retentate and a first permeate;

[0074] S2, concentrating the first permeate using a reverse osmosis membrane, wherein the operating temperature of the reverse osmosis membrane is 45° C. and the membrane pressure is 6.0 MPa, and concentrating the first permeate to a solid content of 40 wt %, to obtain a second retentate and a second permeate;

[0075] S3, separating the second retentate by simulated moving bed chromatography, the simulated moving bed resin model is Lanxiao Technology S1850 potassium type resin, the resin particle size is 300-320um, the flow rate of the mobile phase is set to 1.1BV / h, the switching time of the chromatographic column is 28.4min, and the first organic phase and the first salt phase are collected;

[0076] S4, after the first organic phase is adsorbed by an anion exchange resin, a 3wt% KCl solution and a 15wt% KCl solution are used for continuous analysis, wherein the loading speed of the first organic phase is 2BV / h, and the loading amount is 10BV of the resin volume; the loading speed of the 3wt% KCl solution is 3.0BV / h, and the loading amount is 4.0BV of the resin volume, and the first analysis solution is obtained after analysis; the loading speed of the 15wt% KCl solution is 2.0BV / h, and the loading amount is 2.5BV of the resin volume, and the second analysis solution is obtained after analysis;

[0077] S5, concentrating the second analytical solution using a 400Da nanofiltration membrane, during concentration, the operating temperature of the nanofiltration membrane can be 45°C, the membrane pressure can be selected to be 3.8MPa, and concentrating to a solid content of 40wt%, to obtain a third retentate and a third permeate;

[0078] S6, separating the third retentate by simulated moving bed chromatography separation technology, the simulated moving bed resin model is Lanxiao Technology S1850 calcium type resin, the resin particle size is 300-320um, the flow rate of the mobile phase is set to 1.5BV / h, the switching time of the chromatographic column is 16.9min, and the second organic phase and the second salt phase are collected;

[0079] S7, the second organic phase is concentrated by reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 65°C, the membrane pressure is 6.0Mpa, and the solid content is 30wt%, thereby obtaining potassium phytate product. The purity of potassium phytate is 99.7wt%, and the yield is 94.2%.

[0080] Example 4

[0081] The only difference from Example 2 is that this example continues to concentrate the first analytical solution obtained in step S4 using a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 30° C., the membrane pressure is 3.0 MPa, and the solution is concentrated to a solid content of 30 wt %, thereby obtaining a fourth retentate and a fourth permeate. The fourth retentate is used as an organic fertilizer, and the fourth permeate is used as water for chromatography.

[0082] Example 5

[0083] The difference between this embodiment and embodiment 2 is that the second salt phase obtained in step S6 is further processed, including: concentrating the second salt phase through a reverse osmosis membrane, the operating temperature of the reverse osmosis membrane is 45°C, the membrane pressure is 4.5Mpa, and concentrating to a solid content of 2.5wt%, to obtain a fifth retentate and a fifth permeate. Since the main content of the second salt phase is still potassium chloride, the fifth permeate after the second salt phase is concentrated through the reverse osmosis membrane is used for chromatographic water, and the fifth retentate is a potassium chloride solution with a concentration of 2.5wt%, which can be directly reused in step S4 as a first concentration of KCl solution for analytical resin. The purity of potassium phytate is 99.6wt%, and the yield is 94.3%.

[0084] The second salt phase is concentrated by reverse osmosis membrane, and the retentate is used as the first concentration KCl solution for analytical resin. After long-term operation, the purity and yield of phytic acid are stable.

[0085] Example 6

[0086] The difference between this embodiment and embodiment 2 is that this embodiment further processes the effluent obtained in step S1, i.e., the effluent after the first organic phase is adsorbed by anion exchange resin, and concentrates the effluent to a solid content of 45 wt% through a reverse osmosis membrane. The operating temperature of the reverse osmosis membrane is 45° C., and the membrane pressure is 4.5 MPa. A protein product can be obtained after drying. The protein content in the protein product is tested to be 62.1 wt%.

[0087] Comparative Example 1

[0088] The difference between this comparative example and Example 1 is that in step S4, only 8wt% KCl solution is used for analysis, the loading speed is 1.0BV / h, the loading amount is 1.5BV of the resin volume, and the analysis solution is obtained after analysis; the analysis solution is further processed in subsequent steps under the same conditions to obtain a potassium phytate product. The purity of potassium phytate is 93.1wt%, and the yield is 94.9%.

[0089] Comparative Example 2

[0090] The difference between this comparative example and Example 1 is that in step S4, only a 2wt% KCl solution is used for analysis, the loading speed is 1.0BV / h, the loading amount is 5.0BV of the resin volume, and an analysis solution is obtained after analysis; the analysis solution is further processed in subsequent steps under the same conditions to obtain a potassium phytate product. The purity of potassium phytate is 87.3wt%, and the yield is 94.1%.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing potassium phytate by using corn soaking water, characterized in that: The following steps are involved: The corn soaking water is filtered through a ceramic membrane with a pore size of 20 to 50 nm to obtain a first retentate and a first permeate; The first permeate is concentrated by a reverse osmosis membrane to a solid content of 20 to 40 wt % to obtain a second retentate and a second permeate; Separating the second retentate by simulated moving bed chromatography to collect a first organic phase and a first salt phase; After the first organic phase is adsorbed by an anion exchange resin, a first concentration of KCl solution and a second concentration of KCl solution are used for continuous analysis, wherein the first concentration of KCl solution is used to obtain a first analysis solution, and the second concentration of KCl solution is used to obtain a second analysis solution, and the first concentration of the KCl solution is lower than the second concentration; The second analytical solution is concentrated using a 200-400Da nanofiltration membrane to a solid content of 20-40wt%, to obtain a third retentate and a third permeate; The third retentate is separated by using a simulated moving bed chromatography separation technique to collect a second organic phase and a second salt phase, wherein the simulated moving bed resin particles have a particle size of 220 to 320 um; The second organic phase is concentrated to a solid content of 20-30 wt % by reverse osmosis membrane to obtain a potassium phytate product.

2. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The first analytical solution is concentrated by a reverse osmosis membrane to a solid content of 30-50 wt % to obtain a fourth retentate and a fourth permeate, wherein the fourth permeate is used as chromatography water and the fourth retentate is used as organic fertilizer.

3. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The second salt phase is concentrated through a reverse osmosis membrane to a solid content of 2-3 wt %, to obtain a fifth retentate and a fifth permeate, wherein the fifth permeate is used for chromatography water, and the fifth retentate is used for the first concentration of KCl solution to resolve the resin; or, The third permeate is used to prepare a KCl solution of a second concentration.

4. The method for preparing potassium phytate by using corn soaking water according to any one of claims 1 to 3, characterized in that: The operating temperature of the reverse osmosis membrane is 30-65° C., and the membrane pressure is 3.0-6.0 MPa.

5. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The first concentration of the KCl solution is 2-3 wt %. During analysis, the loading speed is 1.0-3.0 BV / h, and the loading amount is 2.0-4.0 BV of the resin volume.

6. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The second concentration of the KCl solution is 8-15 wt %. During analysis, the loading speed is 1.0-2.0 BV / h, and the loading amount is 1.5-2.5 BV of the resin volume.

7. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The simulated moving bed resin model used in the second retentate is Lanxiao Technology S1850 potassium-type resin, and the particle size of the resin particles is 220-320 um.

8. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The simulated moving bed resin model used in the third retentate is Lanxiao Technology S1850 calcium type resin, and the particle size of the resin particles is 220-320um.

9. The method for preparing potassium phytate by using corn soaking water according to claim 1, characterized in that: The effluent of the first organic phase after adsorption by anion exchange resin is concentrated to a solid content of 40-50wt% through a reverse osmosis membrane, and then dried to obtain a protein product with a protein content of more than 60%.

10. The method for preparing potassium phytate by using corn soaking water according to claim 9, characterized in that: After the first organic phase is adsorbed by the anion exchange resin, 0.5-2 BV of purified water is used to top the anion exchange resin, and the top water liquid is combined with the effluent.