Creatine monohydrate mother liquor treatment system

Abstract

The utility model belongs to the technical field of chemical engineering, and particularly relates to a creatine monohydrate mother liquor treatment system which comprises a first resin tower group, a second resin tower group and a bipolar membrane electrodialysis device. A first mother liquor discharge pipe of the first resin tower group is connected with an inlet of the second resin tower group, and a second mother liquor discharge pipe of the second resin tower group is connected with an inlet of the bipolar membrane electrodialysis device. Sodium sarcosinate in mother liquor is adsorbed by adopting a first resin tower group, cyanamide derivatives in the mother liquor are adsorbed by adopting a second resin tower group, NaCl in the mother liquor is decomposed into NaOH and HCl by adopting a bipolar membrane electrodialysis device, and regenerated NaOH and HCl are respectively reused for resin desorption and production processes. And efficient recovery and resource utilization of organic matters and inorganic salts in the mother liquor are efficiently realized, the discharge of wastewater is reduced, and the method has remarkable environmental protection value and economic benefit.

Description

Technical Field

[0001] This utility model belongs to the field of chemical technology, specifically relating to a creatine monohydrate mother liquor treatment system. Background Technology

[0002] Creatine monohydrate, a core raw material for sports nutrition supplements and pharmaceutical intermediates, has a global annual demand exceeding 100,000 tons. Its mainstream production process involves the condensation reaction of sodium sarcosinate and cyanamide. However, the resulting mother liquor contains unreacted sodium sarcosinate, cyanamide derivatives, sodium chloride, and trace byproducts. Traditional treatment methods rely on acid-base neutralization, which suffers from high pollution, low efficiency, and high costs. After neutralization, the mother liquor has a salt concentration as high as 15%–20% (based on NaCl) and a COD ≥ 5000 mg / L. Direct discharge can easily lead to soil salinization and aquatic ecosystem toxicity. Furthermore, the recovery rate of effective components is less than 60%, and waste liquor treatment costs account for more than 20% of the total production cost. To achieve better environmental benefits, developing efficient and low-consumption mother liquor resource utilization technologies has become an urgent need for the industry. Summary of the Invention

[0003] Based on this, this application provides a creatine monohydrate mother liquor treatment system to solve the technical problems of large waste liquid discharge, easy environmental pollution, and insufficient recovery rate of effective components in the prior art.

[0004] The technical solution to the above-mentioned technical problems in this application is as follows:

[0005] A creatine monohydrate mother liquor treatment system, characterized in that it comprises:

[0006] The first resin tower group is equipped with a first mother liquor discharge pipe;

[0007] The second resin tower group is provided with a second mother liquor discharge pipe connected to the inlet of the second resin tower group.

[0008] The bipolar membrane electrodialysis device has a second mother liquor outlet pipe connected to the inlet of the bipolar membrane electrodialysis device, and the bipolar membrane electrodialysis device has an alkali outlet connected to the desorption inlet of the second resin tower group.

[0009] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, the first resin tower group includes a first anion exchange resin tower and a second anion exchange resin tower connected in series. The inlet of the first anion exchange resin tower is provided with a mother liquor feed pipe, the outlet of the first anion exchange resin tower is connected to the inlet of the second anion exchange resin tower, and the outlet of the second anion exchange resin tower is provided with a first mother liquor discharge pipe.

[0010] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, the first mother liquor discharge pipe is sequentially provided with a mother liquor conveying pump and a mother liquor transfer tank along the discharge direction.

[0011] Preferably, the above-mentioned creatine monohydrate mother liquor treatment system further includes a first desorption liquid tank, the first anion exchange resin tower is provided with a first desorption liquid inlet pipe and a first desorption liquid outlet pipe, the second anion exchange resin tower is provided with a second desorption liquid inlet pipe, the first desorption liquid outlet pipe is connected to a first desorption liquid recovery tank, the first desorption liquid inlet pipe is connected to the desorption inlet at the bottom of the second anion exchange resin tower, and the second desorption liquid inlet pipe is connected to the first desorption liquid tank.

[0012] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, a first desorption liquid transfer tank and a first desorption liquid transfer pump are sequentially arranged on the first desorption liquid feed pipe along the feed direction. A first desorption liquid replenishment pipe is provided at the outlet of the first desorption liquid tank. The other end of the first desorption liquid replenishment pipe is connected to the first desorption liquid transfer tank. A first check valve is provided on the first desorption liquid replenishment pipe.

[0013] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, the second resin tower group includes a first cation exchange resin tower and a second cation exchange resin tower connected in series. The inlet of the first cation exchange resin tower is connected to the first mother liquor outlet pipe, the outlet of the first cation exchange resin tower is connected to the desorption inlet at the bottom of the second cation exchange resin tower, and the outlet of the second cation exchange resin tower is provided with a second mother liquor outlet pipe.

[0014] Preferably, the above-mentioned creatine monohydrate mother liquor treatment system further includes a second desorption liquid tank, the first cation exchange resin tower is provided with a third desorption liquid inlet pipe and a second desorption liquid outlet pipe, the second cation exchange resin tower is provided with a fourth desorption liquid inlet pipe, the second desorption liquid outlet pipe is connected to a second desorption liquid recovery tank, the third desorption liquid inlet pipe is connected to the second cation exchange resin tower, and the fourth desorption liquid inlet pipe is connected to the second desorption liquid tank.

[0015] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, the third desorption liquid feed pipe is sequentially provided with a second desorption liquid transfer tank and a second desorption liquid transfer pump along the feed direction, the outlet of the second desorption liquid tank is provided with a second desorption liquid replenishment pipe, the other end of the second desorption liquid replenishment pipe is connected to the second desorption liquid transfer tank, and the second desorption liquid replenishment pipe is provided with a second check valve.

[0016] Preferably, in the above-mentioned creatine monohydrate mother liquor treatment system, the second desorption liquid recovery tank is connected to a post-treatment device.

[0017] Compared with the prior art, this application has at least the following advantages:

[0018] This application discloses a creatine monohydrate mother liquor treatment system, comprising: a first resin tower group, the first resin tower group being equipped with a first mother liquor discharge pipe; a second resin tower group, the first mother liquor discharge pipe being connected to the inlet of the second resin tower group, the second resin tower group being equipped with a second mother liquor discharge pipe; and a bipolar membrane electrodialysis device, the second mother liquor discharge pipe being connected to the inlet of the bipolar membrane electrodialysis device. The first resin tower group adsorbs sodium creatine from the mother liquor, the second resin tower group adsorbs cyanamide derivatives from the mother liquor, and the bipolar membrane electrodialysis device decomposes 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 synergistic closed-loop recycling process of "resin adsorption-bipolar membrane electrodialysis" can efficiently recover and utilize organic matter and inorganic salts in the mother liquor, reducing wastewater discharge and possessing significant environmental value and economic benefits. Attached Figure Description

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

[0020] In the diagram: First resin tower group 100, first anion exchange resin tower 110, second anion exchange resin tower 120, mother liquor feed pipe 130, first mother liquor discharge pipe 140, mother liquor transfer pump 141, mother liquor transfer tank 142, first desorption liquid tank 150, first desorption liquid feed pipe 160, first desorption liquid transfer tank 161, first desorption liquid transfer pump 162, first desorption liquid replenishment pipe 170, first check valve 171, first desorption liquid discharge pipe 180, first desorption liquid recovery tank 181, second desorption liquid feed pipe 190, second resin tower group 200, first cation exchange... Sub-resin tower 210, second cation 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 replenishment pipe 270, second check valve 271, second mother liquor discharge pipe 280, bipolar membrane electrodialysis device 300, alkali outlet 310, NaOH recovery pipe 320, HCl discharge pipe 330, concentrated water discharge pipe 340, post-treatment device 400. Detailed Implementation

[0021] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can 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 complete understanding of the disclosure of this application.

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

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Please refer to Figure 1 In one specific embodiment of this application, a creatine monohydrate mother liquor treatment system includes: a first resin tower group 100, the first resin tower group 100 being provided with a first mother liquor outlet pipe 140; a second resin tower group 200, the first mother liquor outlet pipe 140 being connected to the inlet of the second resin tower group 200, the second resin tower group 200 being provided with a second mother liquor outlet pipe 280; and a bipolar membrane electrodialysis device 300, the second mother liquor outlet pipe 280 being connected to the inlet of the bipolar membrane electrodialysis device 300, the bipolar membrane electrodialysis device 300 having an alkali outlet 310, the alkali outlet 310 being connected to the desorption inlet of the second resin tower group 200.

[0025] The creatine monohydrate solution produced by the creatine monohydrate production system is cooled, crystallized, and separated to obtain solid creatine monohydrate product and mother liquor. The mother liquor contains unreacted sodium sarcosinate, cyanamide derivatives, sodium chloride, and trace byproducts. The mother liquor is conveyed to the first resin tower group 100, where sodium sarcosinate in the mother liquor is adsorbed. At this point, the mother liquor still contains cyanamide derivatives, sodium chloride, and trace byproducts. This portion of the mother liquor is conveyed to the second resin tower group 200 through the first mother liquor outlet pipe 140. The second resin tower group 200 adsorbs cyanamide derivatives in the mother liquor. The sodium chloride and trace byproducts in the mother liquor discharged through the second mother liquor outlet pipe 280 are then decomposed into NaOH and HCl by a bipolar membrane electrodialysis unit 300. The regenerated NaOH can be conveyed to the desorption inlet of the second resin tower group 200 through the alkali outlet 310 for reuse in resin desorption, and the HCl can be reused in the production process. This "resin adsorption-bipolar membrane electrodialysis" synergistic closed-loop circulation process can efficiently recover and utilize organic matter and inorganic salts in the mother liquor, reduce wastewater discharge, and has significant environmental value and economic benefits.

[0026] 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 a first mother liquor discharge pipe 140.

[0027] Both the first anion exchange resin tower 110 and the second anion exchange resin tower 120 of this application use macroporous basic anion exchange resins containing basic groups, which can selectively adsorb sodium sarcosinate through electrostatic interaction. Examples include resins such as D301, NDA-99, NDA-88, NDA-900, and NDA-55 (produced by Jiangsu Nanda Gode Environmental Protection Technology Co., Ltd., Hebei Langfang Electric Power Resin Co., Ltd., etc.). Specific resin models are not limited here and can be selected according to actual conditions. After the mother liquor undergoes adsorption in the first anion exchange resin tower 110 through the mother liquor feed pipe 130, it is sent to the second anion exchange resin tower 120 for secondary adsorption, which can enhance the adsorption effect and improve the adsorption rate.

[0028] After adsorption in the first resin tower group 100, the mother liquor is then transported to the second resin tower group 200 through the first mother liquor discharge pipe 140. Preferably, the first mother liquor discharge pipe 140 is equipped with a mother liquor transfer pump 141 and a mother liquor transfer tank 142 in sequence along the discharge direction. The mother liquor transfer pump 141 is used to transport the mother liquor after adsorption in the first resin tower group 100 to the second resin tower group 200, and the mother liquor transfer tank 142 is used to temporarily store and transfer this portion of the mother liquor to adapt to intermittent or continuous production.

[0029] After the first resin tower group 100 adsorbs sodium sarcosinate from the mother liquor, it needs to be eluted with desorption liquid for further processing and recovery of sodium sarcosinate, and to regenerate the resin for reuse. Therefore, in a preferred embodiment, the above-mentioned creatine monohydrate mother liquor treatment system further includes a first desorption liquid tank 150. The first anion exchange resin tower 110 is provided with a first desorption liquid inlet pipe 160 and a first desorption liquid outlet pipe 180. The second anion exchange resin tower 120 is provided with a second desorption liquid inlet pipe 190. The first desorption liquid outlet pipe 180 is connected to a first desorption liquid recovery tank 181. The first desorption liquid inlet pipe 160 is connected to the desorption inlet at the bottom of the second anion exchange resin tower 120, and the second desorption liquid inlet 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 the actual situation. The desorption liquid enters the second anion exchange resin tower 120 through the second desorption liquid feed pipe 190 to wash the resin in the second anion exchange resin tower 120. Then, it enters the first anion exchange resin tower 110 through the first desorption liquid feed pipe 160 to wash the resin in the first anion exchange resin tower 110. The washed liquid is discharged to the first desorption liquid recovery tank 181 through the first desorption liquid discharge pipe 180.

[0030] 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 feed direction. A first desorption liquid replenishment pipe 170 is provided at the outlet of the first desorption liquid tank 150. The other end of the first desorption liquid replenishment pipe 170 is connected to the first desorption liquid transfer tank 161. A first check valve 171 is provided on the first desorption liquid replenishment pipe 170.

[0031] After elution in the second anion exchange resin tower 120, the desorption solution is transported to the first desorption solution transfer tank 161. The first desorption solution transfer tank 161 primarily serves as a temporary storage and transfer tank. The first desorption solution transfer pump 162 then transports the liquid from the first desorption solution transfer tank 161 to the first anion exchange resin tower 110 for resin elution. Since some desorption solution is consumed after elution in the second anion exchange resin tower 120, a first desorption solution replenishment pipe 170 is provided between the first desorption solution tank 150 and the first desorption solution transfer tank 161. This allows for direct replenishment of desorption solution from the first desorption solution tank 150 to the first desorption solution transfer tank 161, ensuring sufficient desorption in the first anion exchange resin tower 110. Simultaneously, a first check valve 171 installed on the first desorption solution replenishment pipe 170 prevents backflow of the desorption solution within the pipe.

[0032] In another specific embodiment of this application, the second resin tower group 200 includes a first cation resin tower 210 and a second cation resin tower 220 connected in series. The inlet of the first cation resin tower 210 is connected to the first mother liquor outlet pipe 140, the outlet of the first cation resin tower 210 is connected to the bottom desorption inlet of the second cation resin tower 220, and the outlet of the second cation resin tower 220 is provided with a second mother liquor outlet pipe 280.

[0033] The first cation exchange resin tower 210 and the second cation exchange resin tower 220 of this application use acidic cation exchange resins containing acidic groups, which can adsorb monocyanamide derivatives, such as XAD-4, NDA-150, JX-101, and NDA-110 resins (produced by Jiangsu Nanda Gode Environmental Protection Technology Co., Ltd., Hebei Langfang Electric Power Resin Co., Ltd., etc.). Specific resin models are not limited here and can be selected according to actual conditions. The mother liquor after adsorption in the first resin tower group 100 is sent through the first mother liquor outlet pipe 140 to the first cation exchange resin tower for adsorption of the monocyanamide derivatives therein, and then sent to the second anion exchange resin tower 120 for secondary adsorption, which can enhance the adsorption effect and improve the adsorption rate.

[0034] After the second resin tower group 200 adsorbs the monocyanamide 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 further includes a second desorption liquid tank 260. The first cation resin tower 210 is provided with a third desorption liquid inlet pipe 230 and a second desorption liquid outlet pipe. The second cation resin tower 220 is provided with a fourth desorption liquid inlet pipe. The second desorption liquid outlet pipe is connected to a second desorption liquid recovery tank. The third desorption liquid inlet pipe 230 is connected to the second cation resin tower 220, and the fourth desorption liquid inlet 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 the actual situation. The desorption liquid enters the second cation resin tower 220 through the fourth desorption liquid feed pipe 250 to wash the resin in the second cation resin tower 220. Then, it enters the first cation resin tower 210 through the third desorption liquid feed pipe 230 to wash the resin in the first cation resin tower 210. The washed liquid is discharged to the second desorption liquid recovery tank through the second desorption liquid discharge pipe.

[0035] Furthermore, the third desorption liquid feed pipe 230 is provided with a second desorption liquid transfer tank 231 and a second desorption liquid transfer pump in sequence along the feeding direction. The outlet of the second desorption liquid tank 260 is provided with a second desorption liquid replenishment pipe 270. The other end of the second desorption liquid replenishment pipe 270 is connected to the second desorption liquid transfer tank 231. The second desorption liquid replenishment pipe 270 is provided with a second check valve 271.

[0036] After elution in the second cation exchange resin tower 220, the desorption solution is transported to the second desorption solution transfer tank 231. The second desorption solution transfer tank 231 primarily serves as a temporary storage and transfer tank. A second desorption solution transfer pump then transports the liquid from the second desorption solution transfer tank 231 to the first cation exchange resin tower 210 for resin elution. Since some desorption solution is consumed after elution in the second cation exchange resin tower 220, a second desorption solution replenishment pipe 270 is installed between the second desorption solution tank 260 and the second desorption solution transfer tank 231. This allows for direct replenishment of desorption solution from the second desorption solution tank 260 to the second desorption solution transfer tank 231, ensuring sufficient desorption from the first cation exchange resin tower 210. Simultaneously, a second check valve 271 installed on the second desorption solution replenishment pipe 270 prevents backflow of the desorption solution within the pipe.

[0037] In another specific embodiment of this 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 mixture 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 for processing the mixture in the first desorption liquid recovery tank 181.

[0038] In a preferred embodiment, the bipolar membrane electrodialysis device 300 is equipped with a NaOH recovery pipe 320, an HCl discharge pipe, and a concentrate discharge pipe 340. The NaOH recovery pipe 320 is connected to the inlet of the second desorption tank 260. The bipolar membrane electrodialysis device 300 decomposes NaCl in the mother liquor into HCl and NaOH. HCl is discharged through the HCl discharge pipe and can be used in production. The NaOH recovery pipe 320 is connected to the aforementioned alkali outlet 310, which is connected to the desorption inlet of the second resin tower group 200. That is, the alkali outlet 310 is connected to the second desorption tank 260 through the NaOH recovery pipe 320, and NaOH is transported to the second desorption tank 260 through the NaOH recovery pipe 320 as a supplement to the desorption liquid for resin desorption. At this time, only a small amount of waste liquid is discharged from the concentrate discharge pipe 340, greatly reducing the risk of environmental pollution.

[0039] The above embodiments merely illustrate several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A creatine monohydrate mother liquor treatment system, characterized in that, include: The first resin tower group is equipped with a first mother liquor discharge pipe; The second resin tower group is provided with a second mother liquor discharge pipe connected to the inlet of the second resin tower group. The bipolar membrane electrodialysis device has a second mother liquor outlet pipe connected to the inlet of the bipolar membrane electrodialysis device.

2. The creatine monohydrate mother liquor treatment system as described in claim 1, characterized in that, The first resin tower group includes a first anion exchange resin tower and a second anion exchange resin tower connected in series. The inlet of the first anion exchange resin tower is provided with a mother liquor feed pipe, the outlet of the first anion exchange resin tower is connected to the inlet of the second anion exchange resin tower, and the outlet of the second anion exchange resin tower is provided with a first mother liquor discharge pipe.

3. The creatine monohydrate mother liquor treatment system as described in claim 1, characterized in that, The first mother liquor discharge pipe is equipped with a mother liquor conveying pump and a mother liquor transfer tank in sequence along the discharge direction.

4. The creatine monohydrate mother liquor treatment system as described in claim 2, characterized in that, It also includes a first desorption liquid tank, and the first anion exchange resin tower is equipped with a first desorption liquid inlet pipe and a first desorption liquid outlet pipe. The second anion exchange 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 of the second anion exchange resin tower, and the second desorption liquid feed pipe is connected to the first desorption liquid tank.

5. The creatine monohydrate mother liquor treatment system as described in claim 4, characterized in that, The first desorption liquid feed pipe is provided with a first desorption liquid transfer tank and a first desorption liquid transfer pump in sequence along the feeding direction. The outlet of the first desorption liquid tank is provided with a first desorption liquid replenishment pipe. The other end of the first desorption liquid replenishment pipe is connected to the first desorption liquid transfer tank. The first desorption liquid replenishment pipe is provided with a first check valve.

6. The creatine monohydrate mother liquor treatment system as described in claim 1, characterized in that, The second resin tower group includes a first cation resin tower and a second cation resin tower connected in series. The inlet of the first cation resin tower is connected to the first mother liquor outlet pipe, the outlet of the first cation resin tower is connected to the inlet of the second cation resin tower, and the outlet of the second cation resin tower is provided with a second mother liquor outlet pipe.

7. The creatine monohydrate mother liquor treatment system as described in claim 6, characterized in that, It also includes a second desorption liquid tank. The first cation exchange resin tower is provided with a third desorption liquid feed pipe and a second desorption liquid discharge pipe. The second cation exchange 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 of the second cation exchange resin tower. The fourth desorption liquid feed pipe is connected to the second desorption liquid tank.

8. The creatine monohydrate mother liquor treatment system as described in claim 7, characterized in that, The third desorption liquid feed pipe is provided with a second desorption liquid transfer tank and a second desorption liquid transfer pump in sequence along the feeding direction. The outlet of the second desorption liquid tank is provided with a second desorption liquid replenishment pipe. The other end of the second desorption liquid replenishment pipe is connected to the second desorption liquid transfer tank. The second desorption liquid replenishment pipe is provided with a second check valve.

9. The creatine monohydrate mother liquor treatment system as described in claim 7, characterized in that, The second desorption liquid recovery tank is connected to a post-processing device.

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