Creatine monohydrate mother liquor treatment method and treatment system

Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a creatine monohydrate mother liquor treatment method and system. The method comprises the following steps: firstly, carrying out first resin adsorption on the creatine monohydrate mother liquor to adsorb sodium sarcosinate therein, then carrying out second resin adsorption to adsorb cyanamide derivatives therein, and finally separating sodium ions therein through a bipolar membrane electrodialysis technology. The absorption rate of sodium sarcosinate and cyanamide derivatives is greatly improved, the discharge capacity of waste liquid is obviously reduced, the content of pollutants (COD and ammonia nitrogen) in the waste liquid is obviously reduced, and the method is environmentally friendly. According to the creatine monohydrate mother liquor treatment system disclosed by the invention, efficient recovery and resource utilization of organic matters and inorganic salts in the mother liquor can be efficiently realized, the discharge of wastewater is reduced, and the creatine monohydrate mother liquor treatment system has remarkable environmental protection value and economic benefit.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical industry, and particularly relates to a method and a system for treating creatine monohydrate mother liquor. Background Art

[0002] Creatine monohydrate is a pharmaceutical ingredient and health supplement additive. It can inhibit factors that cause muscle fatigue, reduce fatigue and tension, and restore physical energy. It can also accelerate protein synthesis, strengthen muscles, enhance muscle elasticity, lower cholesterol, blood lipids, and blood sugar levels, improve muscle atrophy in the elderly, and delay aging. For over a decade, creatine monohydrate has been hailed as one of the most popular and effective nutritional supplements, rivaling protein products and consistently ranking among the best-selling supplements. It's considered a "must-have" for bodybuilders and is also widely used by athletes in other sports, such as football and basketball, who seek to improve their energy levels and strength.

[0003] At present, the mainstream production process of creatine monohydrate is achieved through the condensation reaction of sodium sarcosinate and cyanamide, but the mother liquor produced in the process contains unreacted sodium sarcosinate, cyanamide derivatives, sodium chloride and trace by-products. The traditional treatment process relies on acid-base neutralization method, which has bottleneck problems such as high pollution, low efficiency and high cost. The salt concentration of the mother liquor after neutralization is as high as 15-20% (in terms of NaC1), and the COD is ≥5000mg / L. Direct discharge can easily cause soil salinization and water ecological toxicity. At the same time, the recovery rate of effective ingredients is less than 60%, and the cost of waste liquid treatment accounts for more than 20% of the total production cost. The existing technology also uses bipolar membrane electrodialysis technology to treat the mother liquor, but the waste liquid discharge volume is relatively high, usually 1000m 3 The mother liquor will produce 500m 3 Waste liquid. As environmental protection policies become stricter, the development of efficient and low-consumption mother liquor resource recovery technology has become an urgent need in the industry. Summary of the Invention

[0004] Based on this, the present application provides a method and system for treating creatine monohydrate mother liquor to solve the technical problems in the prior art such as large waste liquid discharge, direct discharge easily causing soil salinization and water ecological toxicity, and insufficient recovery rate of effective ingredients.

[0005] The technical solutions of this application to solve the above technical problems are as follows:

[0006] A method for processing creatine monohydrate mother liquor comprises the following steps:

[0007] S10. The creatine monohydrate mother liquor is subjected to a first resin adsorption to adsorb sodium sarcosinate therein to obtain a first mother liquor, wherein the sodium sarcosinate content in the first mother liquor is ≤0.6%;

[0008] S20. The first mother liquor is subjected to a second resin adsorption to adsorb the cyanamide derivative therein to obtain a second mother liquor such that the content of the cyanamide derivative in the second mother liquor is ≤1.3%;

[0009] S30. The second mother liquor is separated by bipolar membrane electrodialysis technology to remove sodium ions to obtain HCl, NaOH and waste liquid;

[0010] S40. Reusing the NaOH in step S20 to elute the resin.

[0011] A creatine monohydrate mother liquor processing system, using the above-mentioned creatine monohydrate mother liquor processing method, the creatine monohydrate mother liquor processing system comprising:

[0012] a first resin tower group, wherein the first resin tower group is provided with a first mother liquor discharge pipe;

[0013] a second resin tower group, wherein the first mother liquid discharge pipe is connected to the inlet of the second resin tower group, and the second resin tower group is provided with a second mother liquid discharge pipe;

[0014] A bipolar membrane electrodialysis device, wherein the second mother liquor discharge pipe is connected to the inlet of the bipolar membrane electrodialysis device, the bipolar membrane electrodialysis device is provided with a NaOH recovery pipe, an HCl discharge pipe and a by-product discharge pipe, and the NaOH recovery pipe is connected to the desorption inlet of the second resin tower group.

[0015] Compared with the prior art, this application has at least the following advantages:

[0016] 1. The present application discloses a method for treating a creatine monohydrate mother liquor, comprising: S10. subjecting the creatine monohydrate mother liquor to a first resin adsorption to adsorb sodium sarcosinate therein, thereby obtaining a first mother liquor, wherein the sodium sarcosinate content in the first mother liquor is ≤0.6%; S20. subjecting the first mother liquor to a second resin adsorption to adsorb cyanamide derivatives therein, thereby obtaining a second mother liquor, wherein the cyanamide derivative content in the second mother liquor is ≤1.3%; S30. subjecting the second mother liquor to a bipolar membrane electrodialysis technique to separate sodium ions therefrom, thereby obtaining HCl, NaOH, and waste liquid; and S40. reusing the NaOH to elute the resin in step S20. Through this "resin adsorption + bipolar membrane electrodialysis" technology, the absorption rate of sodium sarcosinate and monocyanamide derivatives is greatly improved. Through experiments, the adsorption rate of sodium sarcosinate in the mother liquor can reach more than 95%, and the adsorption rate of monocyanamide derivatives is an average of 68%. Especially when the first mother liquor is oxidized with hydrogen peroxide, the adsorption rate of monocyanamide derivatives is further improved to 81%, with excellent adsorption effect.

[0017] 2. The present invention's method for treating creatine monohydrate mother liquor can significantly reduce the amount of waste liquid discharged. Experimental results show that the method is more effective than the existing technology (1000m 3 The mother liquor will produce 500m 3 Wastewater) reduced by 350m 3 , the waste liquid discharge was reduced by 70%; the COD content was reduced from an average of 50 mg / g to 25 mg / g, a reduction rate of 50%; and the ammonia nitrogen content was reduced from an average of 10 mg / g to 4.15 mg / g, a reduction rate of 58.5%. It can be seen that the technical solution of this application can not only effectively adsorb sodium sarcosinate and monocyanamide derivatives in the treatment of creatine monohydrate mother liquor, but also greatly reduce the discharge of waste liquid and the content of pollutants (COD and ammonia nitrogen) in the waste liquid, which is environmentally friendly.

[0018] 3. The creatine monohydrate mother liquor treatment system disclosed in this application utilizes a first resin tower group to adsorb sodium sarcosinate from the mother liquor, a second resin tower group to adsorb cyanamide derivatives from the mother liquor, and a bipolar membrane electrodialysis unit to decompose the NaCl in the mother liquor into NaOH and HCl. The regenerated NaOH can be reused for resin desorption, and the HCl can be reused in the production process. This "resin adsorption-bipolar membrane electrodialysis" synergistic closed-loop process efficiently recovers and recycles organic matter and inorganic salts from the mother liquor, reducing wastewater discharge and providing significant environmental and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a system diagram of the creatine monohydrate mother liquor processing system for this application.

[0020] In the figure: the first resin tower group 100, the first anion resin tower 110, the second anion resin tower 120, the mother liquid feed pipe 130, the first mother liquid discharge pipe 140, the mother liquid delivery pump 141, the mother liquid transfer tank 142, the first desorption liquid tank 150, the first desorption liquid feed pipe 160, the first desorption liquid transfer tank 161, the first desorption liquid transfer pump 162, the first desorption liquid replenishing pipe 170, the first check valve 171, the first desorption liquid discharge pipe 180, the first desorption liquid recovery tank 181, the second desorption liquid feed pipe 190, the second resin tower group 2 ... first anion resin tower 110, the second anion resin tower 110, the mother liquid feed pipe 130, the first mother liquid discharge pipe 140, the mother liquid delivery pump 141, the mother liquid transfer tank 142, the first desorption liquid tank Sub-resin tower 210, second cationic resin tower 220, third desorption liquid feed pipe 230, second desorption liquid transfer tank 231, second desorption liquid transfer pump 232, second desorption liquid discharge pipe 240, second desorption liquid recovery tank 241, fourth desorption liquid feed pipe 250, second desorption liquid tank 260, second desorption liquid replenishing pipe 270, second check valve 271, second mother liquor discharge pipe 280, bipolar membrane electrodialysis device 300, alkali solution outlet 310, NaOH recovery pipe 320, HCl discharge pipe 330, concentrated water discharge pipe 340, post-treatment device 400. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0022] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "bottom end," "top end," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in the specification herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] In one embodiment of the present application, a method for processing creatine monohydrate mother solution comprises the following steps:

[0025] S10. The creatine monohydrate mother liquor is subjected to a first resin adsorption to adsorb sodium sarcosinate therein, thereby obtaining a first mother liquor, wherein the sodium sarcosinate content in the first mother liquor is ≤6%; further, the first resin adsorption comprises passing the creatine monohydrate mother liquor through at least two anion resin towers connected in series for adsorption. The creatine monohydrate mother liquor is obtained from the creatine monohydrate production process. The creatine monohydrate solution produced in the production system is cooled, crystallized, and separated to obtain a solid creatine monohydrate product and a mother liquor. The mother liquor contains unreacted sodium sarcosinate, a cyanamide derivative, sodium chloride, and trace by-products. In this step, the sodium sarcosinate in the mother liquor is first adsorbed through a first resin adsorption. For the adsorption of sodium sarcosinate, a macroporous weakly basic anion exchange resin is selected as the resin, which achieves selective adsorption through the electrostatic interaction between the basic groups and the sodium sarcosinate. To enhance the adsorption effect and improve the adsorption rate, it is preferred that the creatine monohydrate mother liquor be passed through at least two anion resin towers connected in series for adsorption to obtain the first mother liquor. In some cases, in order to increase the adsorption rate of the cyanamide derivative in the subsequent steps, the first mother liquor may be oxidized, for example, by introducing hydrogen peroxide into the first mother liquor, wherein the amount of hydrogen peroxide introduced is 0.5 wt % of the first mother liquor.

[0026] S20. Subjecting the first mother liquor to a second resin adsorption to adsorb the cyanamide derivative therein, thereby obtaining a second mother liquor, wherein the cyanamide derivative content in the second mother liquor is ≤1.5%. Furthermore, the second resin adsorption comprises passing the first mother liquor through at least two cationic resin towers connected in series for adsorption. After the adsorption of sodium sarcosinate in the mother liquor in the previous step, the first mother liquor still contains cyanamide derivatives, sodium chloride, and trace byproducts. In this case, the cyanamide derivatives need to be adsorbed. In the second resin adsorption, an acidic cation exchange resin containing acidic groups capable of adsorbing cyanamide derivatives is selected. Similarly, to enhance the adsorption effect and improve the adsorption rate, it is preferred that the first mother liquor be passed through at least two cationic resin towers connected in series for adsorption to obtain the second mother liquor.

[0027] S30. The second mother liquor is subjected to bipolar membrane electrodialysis to remove sodium ions, thereby obtaining HCl, NaOH, and byproducts. The second mother liquor also contains sodium chloride. In this step, bipolar membrane electrodialysis is used to separate the sodium chloride, decomposing the NaCl in the second mother liquor into HCl and NaOH. Bipolar membrane electrodialysis (BPED) is an electrochemical separation process that utilizes the migration of ions under a direct current electric field and is widely used for separating charged and uncharged media. BME is a physicochemical process that utilizes the selective permeability of anion and cation exchange membranes to anions and cations in a solution under the action of a direct current electric field to separate ionic solutes and solvents in the solution. It can convert salts in aqueous solutions into corresponding acids and bases without introducing new components. The HCl separated by BME can be reused in the production process; NaOH can be used as a desorption solution to elute and regenerate the resin, extending the resin's service life while effectively reusing the mother liquor and saving raw materials.

[0028] S40. Reusing the NaOH in step S20 to elute the resin.

[0029] In a preferred embodiment, the anion resin tower is eluted with a first desorption liquid, wherein the first desorption liquid is a 30% to 80% isopropanol solution and a 1% to 5% NaOH solution, the desorption temperature is 20 to 50°C, and the flow rate of the first desorption liquid is 0.5 to 2BV / h; and the cationic resin tower is eluted with a second desorption liquid, wherein the second desorption liquid is a 30% to 80% isopropanol solution and a 1% to 5% NaOH solution, the desorption temperature is 20 to 50°C, and the flow rate of the second desorption liquid is 0.5 to 2BV / h. In the present application, a gradient elution system, i.e., an "isopropanol-dilute NaOH" gradient elution system, is used for the elution of both the anion resin tower and the cationic resin tower. Combined with dynamic elution (flow rate 2BV / h, temperature 40°C), the desorption rate can be made ≥95% and the resin cycle life can be increased to ≥60 times.

[0030] It is worth noting that the process temperature and process time involved in the above-mentioned embodiments are the temperature or time adopted in the experimental process. Those skilled in the art can make reasonable adjustments within the error range based on the process temperature and process time provided by the present invention, which should be included in the protection scope of the present invention.

[0031] The following is a detailed description of the technical solutions and effects of the present invention through specific experimental examples.

[0032] It should be noted that in the examples of the present invention, all raw materials and reagents are commercially available and can be used without further purification.

[0033] Bipolar membrane electrodialysis device: Shandong Tianwei Membrane Technology Co., Ltd., TWEDBM-8-20S, acid-base conversion rate 12 mol / hr;

[0034] COD meter: 10-5000 mg / L COD, Dalian Xindongxing Instrument Co., Ltd.

[0035] Ammonia nitrogen meter: 0-500 mg / L, Dalian Xindongxing Instrument Co., Ltd.

[0036] Anion resin: NDA-99, Hebei Langfang Electric Power Resin Co., Ltd.

[0037] Cationic resin: XAD-4, Hebei Langfang Electric Power Resin Co., Ltd.

[0038] Mother liquor properties: sodium sarcosinate content 12%, cyanamide derivative content 4%, COD content 50 mg / g, ammonia nitrogen content 10 mg / g.

[0039] 1. Experimental Example 1

[0040] 1000m 3 The mother liquor is first sent to two anion resin towers connected in series for adsorption to obtain a first mother liquor, and the sodium sarcosinate content in the first mother liquor is detected; the first mother liquor is then sent to two cationic resin towers connected in series for adsorption to obtain a second mother liquor, and the cyanamide derivative content in the second mother liquor is detected; the second mother liquor is then sent to a bipolar membrane electrodialysis device for treatment, the waste liquid is collected, and the pollutant content in the waste liquid is detected.

[0041] 2. Experimental Example 2

[0042] 1000m 3The mother liquor is first fed into two anion resin towers connected in series for adsorption to obtain a first mother liquor, and the sodium sarcosinate content in the first mother liquor is detected; hydrogen peroxide is then introduced into the first mother liquor for oxidation, with the amount of hydrogen peroxide introduced being 0.5 wt % of the first mother liquor; the oxidized first mother liquor is fed into two cationic resin towers connected in series for adsorption to obtain a second mother liquor, and the content of monocyanamide derivatives in the second mother liquor is detected; the second mother liquor is then fed into a bipolar membrane electrodialysis device for treatment, the waste liquid is collected, and the pollutant content in the waste liquid is detected.

[0043] The pollutant content in the above waste liquid was tested, and the results are as follows:

[0044] Table 1 Detection results of pollutants in wastewater

[0045]

[0046] As can be seen from the table above, the "resin adsorption + bipolar membrane electrodialysis" technology of the present application can achieve an adsorption rate of sodium sarcosinate in the mother liquor of more than 95%, and an average adsorption rate of monocyanamide derivatives of 68%. At the same time, the discharge volume of the waste liquid is also significantly reduced, which is better than the existing technology (1000m 3 The mother liquor will produce 500m 3 Wastewater) reduced by 350m 3 , the waste liquid discharge was reduced by 70%; the COD content was reduced from an average of 50 mg / g to 25 mg / g, a reduction rate of 50%; the ammonia nitrogen content was reduced from an average of 10 mg / g to 4.15 mg / g, a reduction rate of 58.5%. It can be seen that the technical solution of the present application can not only effectively adsorb sodium sarcosinate and monocyanamide derivatives in the treatment of creatine monohydrate mother liquor, but also greatly reduce the discharge of waste liquid and reduce the content of pollutants (COD, ammonia nitrogen) in the waste liquid, which is environmentally friendly. In particular, in Experimental Example 2, the first mother liquor was oxidized using hydrogen peroxide, and the adsorption rate of monocyanamide derivatives was further improved to 81%, which is an excellent adsorption effect.

[0047] In another specific embodiment of the present application, a creatine monohydrate mother liquor processing system includes: a first resin tower group 100, wherein the first resin tower group 100 is provided with a first mother liquor discharge pipe 140; a second resin tower group 200, wherein the first mother liquor discharge pipe 140 is connected to the inlet of the second resin tower group 200, and the second resin tower group 200 is provided with a second mother liquor discharge pipe 280; a bipolar membrane electrodialysis device 300, wherein the second mother liquor discharge pipe 280 is connected to the inlet of the bipolar membrane electrodialysis device 300, and the bipolar membrane electrodialysis device 300 is provided with a NaOH recovery pipe 320, an HCl discharge pipe and a concentrated water discharge pipe 340, and the NaOH recovery pipe 320 is connected to the inlet of the second desorption liquid tank 260.

[0048] The creatine monohydrate solution produced by the creatine monohydrate production system is cooled, crystallized, and separated to obtain a solid creatine monohydrate product and mother liquor. The mother liquor contains unreacted sodium sarcosinate, cyanamide derivatives, sodium chloride, and trace by-products. The mother liquor is transported to the first resin tower group 100, where the sodium sarcosinate in the mother liquor is adsorbed by the first resin tower group 100. At this time, the mother liquor also contains cyanamide derivatives, sodium chloride, and trace by-products. This mother liquor is transported to the second resin tower group 200 through the first mother liquor discharge pipe 140. The second resin tower group 200 adsorbs the cyanamide derivative in the mother liquor. The sodium chloride and trace by-products in the mother liquor discharged through the second mother liquor discharge pipe 280 are then passed through the bipolar membrane electrodialysis device 300 to decompose the NaCl into NaOH and HCl. The HCl is then decomposed into NaOH and HCl through HCl. The wastewater is discharged through the discharge pipe and can be used in production. The NaOH recovery pipe 320 is connected to the aforementioned alkali solution outlet 310, which is in turn connected to the desorption inlet of the second resin tower assembly 200. In other words, the alkali solution outlet 310 is connected to the second desorption tank 260 via the NaOH recovery pipe 320. NaOH is transported to the second desorption tank 260 via the NaOH recovery pipe 320 to supplement the desorption solution and desorb the resin. At this point, only a small amount of wastewater is discharged from the concentrate discharge pipe 340, significantly reducing environmental pollution risks. This "resin adsorption-bipolar membrane electrodialysis" synergistic closed-loop process efficiently recovers and recycles organic matter and inorganic salts from the mother liquor, reducing wastewater discharge and providing significant environmental and economic benefits.

[0049] Furthermore, the first resin tower group 100 includes a first anion resin tower 110 and a second anion resin tower 120 connected in series, the inlet of the first anion resin tower 110 is provided with a mother liquor feed pipe 130, the outlet of the first anion resin tower 110 is connected to the inlet of the second anion resin tower 120, and the outlet of the second anion resin tower 120 is provided with the first mother liquor discharge pipe 140.

[0050] The first anion resin tower 110 and the second anion resin tower 120 of the present application both utilize macroporous alkaline anion exchange resins containing alkaline groups that can electrostatically interact with sodium sarcosinate to achieve selective adsorption, such as D301, NDA-99, NDA-88, NDA-900, and NDA-55 resins (produced by Jiangsu Nanda Gold Environmental Protection Technology Co., Ltd. and Hebei Langfang Electric Power Resin Co., Ltd.). The specific resin model is not limited herein and can be selected based on actual conditions. After the mother liquor is adsorbed in the first anion resin tower 110 through the mother liquor feed pipe 130, it is fed into the second anion resin tower 120 for secondary adsorption, which can enhance the adsorption effect and improve the adsorption rate.

[0051] After adsorption in the first resin tower assembly 100, the mother liquor is transported to the second resin tower assembly 200 via a first mother liquor discharge pipe 140. Preferably, the first mother liquor discharge pipe 140 is sequentially provided with a mother liquor transfer pump 141 and a mother liquor transfer tank 142 along the discharge direction. The mother liquor transfer pump 141 is used to transfer the mother liquor after adsorption in the first resin tower assembly 100 to the second resin tower assembly 200. The mother liquor transfer tank 142 is used to temporarily store and transfer this mother liquor to accommodate intermittent or continuous production.

[0052] After the first resin tower group 100 adsorbs the sodium sarcosinate in the mother liquor, it needs to be eluted with a desorption liquid for further processing and recovery of the sodium sarcosinate, and the resin is regenerated for reuse. Therefore, in a preferred embodiment, the above-mentioned creatine monohydrate mother liquor treatment system also includes a first desorption liquid tank 150, the first anion resin tower 110 is provided with a first desorption liquid feed pipe 160 and a first desorption liquid discharge pipe 180, the second anion resin tower 120 is provided with a second desorption liquid feed pipe 190, the first desorption liquid discharge pipe 180 is connected to the first desorption liquid recovery tank 181, the first desorption liquid feed pipe 160 is connected to the desorption inlet at the bottom end of the second anion resin tower 120, and the second desorption liquid feed pipe 190 is connected to the first desorption liquid tank 150. The first desorption liquid tank 150 is used to hold the desorption liquid. The composition of the desorption liquid is selected according to actual conditions. The desorption liquid enters the second anion resin tower 120 through the second desorption liquid feed pipe 190 to elute the resin in the second anion resin tower 120. Then, the desorption liquid enters the first anion resin tower 110 through the first desorption liquid feed pipe 160 to elute the resin in the first anion resin tower 110. The eluted liquid is discharged to the first desorption liquid recovery tank 181 through the first desorption liquid discharge pipe 180.

[0053] Furthermore, a first desorption liquid transfer tank 161 and a first desorption liquid transfer pump 162 are sequentially arranged on the first desorption liquid feed pipe 160 along the feeding direction, and a first desorption liquid replenishing pipe 170 is provided at the outlet of the first desorption liquid tank 150. The other end of the first desorption liquid replenishing pipe 170 is connected to the first desorption liquid transfer tank 161, and a first check valve 171 is provided on the first desorption liquid replenishing pipe 170.

[0054] After elution in the second anion resin tower 120, the desorption liquid is transferred to the first desorption liquid transfer tank 161. This first desorption liquid transfer tank 161 primarily serves as a temporary storage and transfer point. A first desorption liquid transfer pump 162 then transfers the liquid from the first desorption liquid transfer tank 161 to the first anion resin tower 110 for resin elution. Because desorption liquid is consumed after elution in the second anion resin tower 120, a first desorption liquid replenishment pipe 170 is provided between the first desorption liquid tank 150 and the first desorption liquid transfer tank 161. This allows for direct replenishment of desorption liquid from the first desorption liquid tank 150 to the first desorption liquid transfer tank 161, ensuring sufficient desorption in the first anion resin tower 110. Furthermore, a first check valve 171 provided on the first desorption liquid replenishment pipe 170 prevents backflow of desorption liquid within the first desorption liquid replenishment pipe 170.

[0055] In another specific embodiment of the present application, the second resin tower group 200 includes a first cationic resin tower 210 and a second cationic resin tower 220 connected in series, the inlet of the first cationic resin tower 210 is connected to the first mother liquor discharge pipe 140, the outlet of the first cationic resin tower 210 is connected to the desorption inlet at the bottom end of the second cationic resin tower 220, and the outlet of the second cationic resin tower 220 is provided with a second mother liquor discharge pipe 280.

[0056] The first cationic resin tower 210 and the second cationic resin tower 220 of the present application utilize acidic cation exchange resins containing acidic groups capable of adsorbing cyanamide derivatives, such as XAD-4, NDA-150, JX-101, and NDA-110 resins (produced by Jiangsu Nanda Gold Environmental Protection Technology Co., Ltd. and Hebei Langfang Electric Power Resin Co., Ltd.). The specific resin model is not limited herein and may be selected based on practical circumstances. The mother liquor adsorbed by the first resin tower assembly 100 is fed through the first mother liquor discharge pipe 140 to the first cationic resin tower for adsorption of the cyanamide derivatives therein, and then to the second anionic resin tower 120 for secondary adsorption, thereby enhancing the adsorption effect and improving the adsorption rate.

[0057] After the second resin tower group 200 adsorbs the cyanamide derivative in the mother liquor, it needs to be eluted with a desorption liquid. Therefore, in a preferred embodiment, the above-mentioned creatine monohydrate mother liquor treatment system also includes a second desorption liquid tank 260, the first cationic resin tower 210 is provided with a third desorption liquid feed pipe 230 and a second desorption liquid discharge pipe, the second cationic resin tower 220 is provided with a fourth desorption liquid feed pipe, the second desorption liquid discharge pipe is connected to a second desorption liquid recovery tank, the third desorption liquid feed pipe 230 is connected to the second cationic resin tower 220, and the fourth desorption liquid feed pipe is connected to the second desorption liquid tank 260. The second desorption liquid tank 260 is used to hold the desorption liquid. The composition of the desorption liquid is selected according to actual conditions. The desorption liquid enters the second cationic resin tower 220 through the fourth desorption liquid feed pipe 250 to elute the resin in the second cationic resin tower 220. Then, the desorption liquid enters the first cationic resin tower 210 through the third desorption liquid feed pipe 230 to elute the resin in the first cationic resin tower 210. The eluted liquid is discharged to the second desorption liquid recovery tank through the second desorption liquid discharge pipe.

[0058] Furthermore, a second desorption liquid transfer tank 231 and a second desorption liquid transfer pump are sequentially arranged on the third desorption liquid feed pipe 230 along the feeding direction, and a second desorption liquid replenishing pipe 270 is provided at the outlet of the second desorption liquid tank 260. The other end of the second desorption liquid replenishing pipe 270 is connected to the second desorption liquid transfer tank 231, and a second check valve 271 is provided on the second desorption liquid replenishing pipe 270.

[0059] After elution in the second cationic resin tower 220, the desorption liquid is transferred to the second desorption liquid transfer tank 231, which serves primarily as a temporary storage and transfer mechanism. A second desorption liquid transfer pump then transfers the liquid from the second desorption liquid transfer tank 231 to the first cationic resin tower 210 for resin elution. Because desorption liquid is consumed after elution in the second cationic resin tower 220, a second desorption liquid replenishment pipe 270 is provided between the second desorption liquid tank 260 and the second desorption liquid transfer tank 231. This allows desorption liquid to be directly replenished from the second desorption liquid tank 260 to the second desorption liquid transfer tank 231, ensuring sufficient desorption in the first cationic resin tower 210. Furthermore, a second check valve 271 provided on the second desorption liquid replenishment pipe 270 prevents backflow of desorption liquid within the second desorption liquid replenishment pipe 270.

[0060] In another specific embodiment of the present application, the second desorption liquid recovery tank is connected to a post-processing device 400. The post-processing device 400 is used to process the mixed liquid in the second desorption liquid recovery tank, such as separation, purification and crystallization, resource recycling and environmental protection treatment. Similarly, the first desorption liquid recovery tank 181 can also be connected to the post-processing device 400 to process the mixed liquid in the first desorption liquid recovery tank 181.

[0061] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for processing creatine monohydrate mother liquor, characterized in that: The following steps are involved: S10. The creatine monohydrate mother liquor is subjected to a first resin adsorption to adsorb sodium sarcosinate therein to obtain a first mother liquor, wherein the sodium sarcosinate content in the first mother liquor is ≤0.6%; S20. The first mother liquor is subjected to a second resin adsorption to adsorb the cyanamide derivative therein to obtain a second mother liquor, wherein the cyanamide derivative content in the second mother liquor is ≤1.3%; S30. The second mother liquor is separated by bipolar membrane electrodialysis technology to remove sodium ions to obtain HCl, NaOH and waste liquid; S40. Reusing the NaOH in step S20 to elute the resin.

2. The method for processing creatine monohydrate mother liquor according to claim 1, wherein In step S10, the first resin adsorption includes adsorbing the creatine monohydrate mother solution through at least two anion resin towers connected in series.

3. The creatine monohydrate mother solution processing method according to claim 2, wherein The method further includes eluting the anion resin tower with a first desorption liquid, wherein the first desorption liquid includes: 30% to 80% isopropanol solution and 1% to 5% NaOH solution, the desorption temperature is 20 to 50° C., and the flow rate of the first desorption liquid is 0.5 to 2 BV / h.

4. The method for processing creatine monohydrate mother solution according to claim 1, wherein In step S20, the second resin adsorption includes passing the first mother liquor through at least two cationic resin towers connected in series for adsorption.

5. The method for processing creatine monohydrate mother solution according to claim 4, wherein The method further includes eluting the cationic resin tower with a second desorption liquid, wherein the second desorption liquid includes: 30% to 80% isopropanol solution and 1% to 5% NaOH solution, the desorption temperature is 20 to 50° C., and the flow rate of the second desorption liquid is 0.5 to 2 BV / h.

6. A creatine monohydrate mother liquor processing system, using the creatine monohydrate mother liquor processing method according to any one of claims 1 to 5, the creatine monohydrate mother liquor processing system comprising: a first resin tower group, wherein the first resin tower group is provided with a first mother liquor discharge pipe; a second resin tower group, wherein the first mother liquid discharge pipe is connected to the inlet of the second resin tower group, and the second resin tower group is provided with a second mother liquid discharge pipe; A bipolar membrane electrodialysis device, wherein the second mother liquor discharge pipe is connected to the inlet of the bipolar membrane electrodialysis device, the bipolar membrane electrodialysis device is provided with a NaOH recovery pipe, an HCl discharge pipe and a by-product discharge pipe, and the NaOH recovery pipe is connected to the desorption inlet of the second resin tower group.

7. The creatine monohydrate mother liquor processing system according to claim 6, wherein: The first resin tower group includes a first anion resin tower and a second anion resin tower connected in series, the inlet of the first anion resin tower is provided with a mother liquor feed pipe, the outlet of the first anion resin tower is connected to the inlet of the second anion resin tower, and the outlet of the second anion resin tower is provided with the first mother liquor discharge pipe.

8. The creatine monohydrate mother liquor processing system according to claim 7, wherein: It also includes a first desorption liquid tank, the first anion resin tower is provided with a first desorption liquid feed pipe and a first desorption liquid discharge pipe, the second anion resin tower is provided with a second desorption liquid feed pipe, the first desorption liquid discharge pipe is connected to a first desorption liquid recovery tank, the first desorption liquid feed pipe is connected to the desorption inlet at the bottom end of the second anion resin tower, and the second desorption liquid feed pipe is connected to the first desorption liquid tank.

9. The creatine monohydrate mother liquor processing system according to claim 6, wherein: The second resin tower group includes a first cationic resin tower and a second cationic resin tower connected in series, the inlet of the first cationic resin tower is connected to the first mother liquor discharge pipe, the outlet of the first cationic resin tower is connected to the inlet of the second cationic resin tower, and the outlet of the second cationic resin tower is provided with a second mother liquor discharge pipe.

10. The creatine monohydrate mother liquor processing system according to claim 9, characterized in that: The invention also includes a second desorption liquid tank, the first cationic resin tower is provided with a third desorption liquid feed pipe and a second desorption liquid discharge pipe, the second cationic resin tower is provided with a fourth desorption liquid feed pipe, the second desorption liquid discharge pipe is connected to a second desorption liquid recovery tank, the third desorption liquid feed pipe is connected to the desorption inlet at the bottom end of the second cationic resin tower, and the fourth desorption liquid feed pipe is connected to the second desorption liquid tank.

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