Method for preparing copper methionine from methionine intermediate and copper methionine

Abstract

The present application provides a method for preparing copper methionine from a methionine intermediate and copper methionine, and relates to the technical field of feed additive preparation. The method for preparing copper methionine from a methionine intermediate comprises: obtaining a sodium methionine solution and a copper sulfate solution; adjusting the pH of the sodium methionine solution; adding the copper sulfate solution to the sodium methionine solution for a chelation reaction to obtain a copper methionine solution; separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate; and drying the copper methionine filter cake to obtain a copper methionine product. The synthesis of copper methionine with sodium methionine solves the problem of the complex synthesis process of sodium methionine chelating copper methionine, allowing the mother liquor to be recycled, saving costs while reducing harm to the environment.

Description

Technical Field

[0001] The invention relates to the technical field of feed additive preparation, and in particular to a method for preparing copper methionine from a methionine intermediate and copper methionine. Background Art

[0002] Research in the past 20 years has shown that amino acid chelates have stable chemical properties, can enhance human immune function, improve human anti-stress ability, have a synergistic growth-promoting effect on animal growth, and can improve feed efficiency. They can alleviate the competition antagonism between trace elements during absorption, greatly improve the absorption and utilization rate of copper ions by animals, and can also improve the absorption of other trace elements, etc.

[0003] The process of synthesizing copper methionine is complicated and the cost is high. In addition, the copper methionine on the market is not pure and has uneven quality, which is an important factor affecting the market prospects of copper methionine. All methods disclosed now use methionine for chelation, which causes the cost of copper methionine to be very high. Patents CN201880057537.8, CN111094301A and CN111051317A have complex process steps, and metal waste will be generated at the same time, which increases production costs and is not suitable for industrial production. However, patent CN202010829425.9 not only uses finished methionine as raw material to increase costs, but also synthesized copper methionine contains a large amount of copper hydroxide solids, which are unstable in properties and low in purity, and the subsequent processes are not processed, so they all affect large-scale production.

[0004] How to simplify the synthesis process and reduce costs has become a problem restricting the large-scale production of copper methionine. Summary of the invention

[0005] The invention provides a method for preparing copper methionine from a methionine intermediate. Sodium methionine is used to synthesize copper methionine, thereby solving the problem of complex synthesis process of sodium methionine chelated copper methionine, allowing mother liquor to be recycled, saving costs while reducing harm to the environment.

[0006] The present invention provides a method for preparing copper methionine from a methionine intermediate, comprising:

[0007] Obtain sodium methionine solution and copper sulfate solution;

[0008] Adjusting the pH of the sodium methionine solution, and then adjusting the concentration of the sodium methionine solution;

[0009] adding the copper sulfate solution to the sodium methionine solution to carry out a chelating reaction to obtain a copper methionine solution;

[0010] Separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate;

[0011] The copper methionine filter cake is dried to obtain a copper methionine product.

[0012] Further, the step of adjusting the pH of the sodium methionine solution comprises:

[0013] Dilute sulfuric acid is added dropwise to the sodium methionine solution to adjust the pH of the sodium methionine solution to between 7.0 and 7.5.

[0014] Furthermore, the concentration of the sodium methionine solution is adjusted to 6% to 8%.

[0015] Furthermore, the concentration of the sodium methionine solution is adjusted to 6% to 8% by adding water.

[0016] Furthermore, after adjusting the pH value of the sodium methionine solution, the following steps are also included:

[0017] The sodium methionine solution is heated and stirred to discharge carbonate and bicarbonate in the solution in the form of carbon dioxide.

[0018] Further, the heating and stirring of the sodium methionine solution comprises:

[0019] The sodium methionine solution was heated to 150 degrees Celsius and stirred for 1.5 hours.

[0020] Further, the step of adding the copper sulfate solution to the sodium methionine solution for chelating reaction comprises:

[0021] Lowering the temperature of the sodium methionine solution to between 65 and 85 degrees Celsius;

[0022] Adding the copper sulfate solution in a molar ratio of 2.0 / 1 to 2.2 / 1 to the sodium methionine;

[0023] The pH of the chelation reaction is controlled between 2.80 and 4.27;

[0024] The chelating reaction time was 1.5 hours.

[0025] Further, the separation of the copper methionine solution comprises:

[0026] Centrifugally separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate;

[0027] The filtrate is recycled.

[0028] Further, the drying of the copper methionine filter cake comprises:

[0029] The copper methionine filter cake is placed in a sealed drying device at 105 degrees Celsius and dried for 1 to 2 hours to obtain a copper methionine product.

[0030] The present invention further provides copper methionine prepared by a method for preparing copper methionine from a methionine intermediate.

[0031] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0032] The invention discloses a method for preparing high-purity copper methionine. The method uses sodium methionine aqueous solution in the process of synthesizing methionine as raw material, and realizes efficient chelation of methionine and copper ions by accurately controlling key parameters such as pH value, temperature, reaction time, etc. First, the sodium methionine solution is adjusted to neutrality and carbon dioxide is removed, and then reacted with an excess copper sulfate solution at a suitable temperature. The pH value is strictly controlled between 2.80 and 4.27 during the entire chelation process to avoid the formation of copper hydroxide precipitation. After the reaction is completed, the copper methionine product with a light sky blue color is finally obtained through post-treatment processes such as centrifugation and drying. The product has the advantages of high chelation rate, stable properties, good solubility, etc. The invention solves the problems of incomplete chelation and low product purity in traditional methods, and significantly improves the production efficiency and product quality of copper methionine. At the same time, the recycling of the filtrate realizes the recycling of resources, which has good economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention provides a flow chart of a method for preparing copper methionine from a methionine intermediate. DETAILED DESCRIPTION

[0034] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0035] like Figure 1 In this embodiment, a method for preparing copper methionine from a methionine intermediate may specifically include:

[0036] S101. Obtain a sodium methionine solution and a copper sulfate solution.

[0037] There are two main ways to obtain sodium methionine solution: one is to directly purchase commercially available sodium methionine solid or solution; the other is to use the intermediate sodium methionine solution produced in the production process of synthetic methionine. Using the first method, the purchased sodium methionine solid can be directly dissolved in water to prepare a solution of the required concentration. For example, dissolving 100 grams of sodium methionine solid in 900 grams of water can obtain a sodium methionine solution with a concentration of about 10%. Using the second method, the sodium methionine solution produced on the production line can be directly used, which can save costs and improve efficiency. For example, a chemical plant will produce a sodium methionine solution with a concentration of 8% in the production process of synthetic methionine, which can be directly used for the synthesis of copper methionine. The acquisition of copper sulfate solution is relatively simple. Generally, commercially available anhydrous copper sulfate or copper sulfate pentahydrate solid is directly purchased and dissolved in water to prepare a solution of the required concentration.

[0038] It should be noted that no matter which method is used to obtain the solution, the purity of the raw materials should be ensured to avoid the influence of impurities on the subsequent chelating reaction.

[0039] S102, adjusting the pH of the sodium methionine solution, and then adjusting the concentration of the sodium methionine solution.

[0040] Adjust the pH of the sodium methionine solution: The pH of the sodium methionine solution is adjusted to between 7.0 and 7.5 in order to remove carbonate and bicarbonate ions that may be present in the solution. These ions may react with copper ions to form copper carbonate precipitates in subsequent chelation reactions, affecting the purity and yield of copper methionine. The pH value of the solution needs to be measured with precision pH test paper or a pH meter. If the pH value is not within the range of 7.0 to 7.5, it is necessary to use a 0.5 mol / L sulfuric acid solution for adjustment. For example, if the pH value of the solution is 6.5, it is necessary to slowly add sulfuric acid solution and stir continuously until the pH value reaches between 7.0 and 7.5. If the pH value is higher than 7.5, dilute hydrochloric acid can be used for adjustment.

[0041] Then, the prepared sodium methionine solution is heated to 150 degrees Celsius and stirred for 1.5 hours to allow the carbonate and bicarbonate in the solution to escape in the form of carbon dioxide. The heating process needs to control the temperature to avoid excessive temperature causing sodium methionine to decompose. At the same time, stirring can promote the escape of carbon dioxide and improve the removal efficiency.

[0042] After the heating and stirring is completed, it is necessary to add an appropriate amount of water (for example, add an amount of water equal to the amount of water lost by evaporation during high-temperature exhaust) to control the concentration of the sodium methionine solution between 6% and 8%, thereby providing a suitable concentration environment for the subsequent chelation reaction. This concentration range is selected because too low a concentration will reduce the reaction rate, while too high a concentration will easily lead to a viscous solution, which is not conducive to operation.

[0043] S103, adding the copper sulfate solution to the sodium methionine solution to carry out a chelating reaction to obtain a copper methionine solution.

[0044] The sodium methionine solution is pre-treated with sulfuric acid to adjust the pH value and high temperature to remove carbonate and bicarbonate ions in the solution, and the concentration of sodium methionine is controlled between 6% and 8%. This creates good conditions for the subsequent chelation reaction. The chelation reaction is carried out at a temperature of 65 to 85 degrees Celsius, and temperature control is crucial to the chelation rate. Too low a temperature will result in a slow reaction rate, while too high a temperature may cause the decomposition of methionine. The molar ratio of copper sulfate solution to sodium methionine is controlled to be 2.0 / 1 to 2.2 / 1. A slightly excessive amount of copper sulfate can ensure that sodium methionine reacts fully and improves the chelation rate. In the process of adding copper sulfate solution, the pH value of the reaction system needs to be strictly controlled between 2.80 and 4.22. This is because within this pH range, the chelation reaction efficiency of copper methionine is the highest and the product purity is the best.

[0045] Experiments have shown that copper methionine can be synthesized while avoiding the formation of copper hydroxide, based on the different solubility of copper hydroxide solid in aqueous solutions under different pH conditions.

[0046] (1) Add 0.1 mol of copper sulfate solid to a beaker containing 1 L of aqueous solution, and adjust the pH value of the solution with sulfuric acid and sodium hydroxide. When the pH value of the solution is 4.27, the copper hydroxide is basically dissolved.

[0047] (2) Add 0.2 mol of copper sulfate solid to a beaker containing 1 L of aqueous solution, and adjust the pH value of the solution with sulfuric acid and sodium hydroxide. When the pH value of the solution is 4.22, the copper hydroxide is basically dissolved.

[0048] (3) Add 0.2 mol of copper methionine solid to a beaker containing 1 L of aqueous solution, and adjust the pH value of the solution to different levels using sulfuric acid and sodium hydroxide. The copper methionine begins to dissolve significantly when the pH value of the solution is 2.8.

[0049] Therefore, the chelation pH is between 2.80 and 4.22, which is more suitable. Too high a pH value will lead to the formation of copper hydroxide impurities, affecting product quality. The chelation reaction time is controlled within 1.5 hours to ensure complete reaction.

[0050] The use of copper sulfate and sodium methionine as raw materials greatly reduces the cost and ensures the purity of copper methionine. The process is simple and efficient. The specific operation plan is as follows:

[0051] For example, (1) the pH value of the sodium methionine solution is adjusted to between 7.0 and 7.5 with 0.5 mol / L sulfuric acid, heated at 150 degrees and stirred for 1.5 hours (so that the carbonate and bicarbonate in the solution are discharged in the form of carbon dioxide), and then water is added to adjust the concentration of the sodium methionine to between 6% and 8%.

[0052] (2) The temperature of the above solution is lowered to between 65 and 85 degrees Celsius, and a copper sulfate solution having a molar ratio of 2.05 to 1 with respect to sodium methionine is added for chelation, and the pH is controlled between 2.80 and 4.22. The chelation time is 1.5 hours.

[0053] (3) After the chelation is completed, the solution is centrifuged and the filtrate is recycled in the post-treatment process. The synthesized copper methionine is placed in a sealed drying device at 105° C. and dried for 1 to 2 hours to obtain the product.

[0054] Product testing conclusion:

[0055] (1) When the chelation pH is 4.5-10.0, copper methionine becomes dark blue powder or sky blue powder. Because it contains a large amount of copper hydroxide, it is loose powder with variable properties and poor quality. The chelation rate is about 85%, which is unstable.

[0056] When the chelation pH is 2.80-4.27, copper methionine turns light sky blue and has the property of slightly adhering to the cup wall. Its properties are stable. After testing, the chelation rates of all copper methionines are greater than 98%, and the quality is good.

[0057] S104, separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate.

[0058] Here, it includes:

[0059] Centrifugally separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate;

[0060] The filtrate is recycled.

[0061] Centrifugal separation of copper methionine solution can effectively separate the copper methionine filter cake and filtrate. Centrifugal separation is the process of separating solid particles from liquid in a suspension by centrifugal force. Under the action of centrifugal force, solid particles with higher density will settle to the bottom of the centrifuge to form a filter cake, while liquid with lower density will remain in the upper layer to form a filtrate. The separation effect can be optimized by controlling parameters such as centrifugal speed and time. For example, a preliminary separation can be performed at a lower speed first, and then the speed can be gradually increased for fine separation to ensure that the content of solid particles in the filter cake is as high as possible and the content of solid particles in the filtrate is as low as possible. In addition, the viscosity of the material can be controlled by adjusting the temperature of the centrifuge to improve the separation efficiency. Recycling the separated filtrate can reduce the discharge of waste liquid, reduce production costs, and improve resource utilization. The filtrate usually contains unreacted raw materials, by-products, etc., and direct discharge will cause resource waste and environmental pollution. By recycling the filtrate, the useful components in it can be recycled and put back into production. For example, the filtrate can be added back into the reaction system to react with new raw materials; or the filtrate can be purified to separate useful components as raw materials for other products. Recycling the filtrate can not only reduce waste liquid discharge, but also improve the utilization rate of raw materials and reduce production costs. At the same time, recycling is also conducive to reducing environmental pollution and achieving clean production.

[0062] S105, drying the copper methionine filter cake to obtain a copper methionine product.

[0063] The drying step of the copper methionine filter cake includes placing the filter cake in a sealed drying device at 105 degrees Celsius, drying for 1 to 2 hours, and finally obtaining a copper methionine product. The specific implementation method can be illustrated from the following aspects: 1. Selection of drying equipment: The selection of sealed drying equipment is crucial, and its material should be corrosion-resistant to avoid chemical reactions with copper methionine and affect the purity of the product. For example, a stainless steel oven or a vacuum oven can be selected. Ordinary ovens are easy to operate and have low costs, but the drying speed is relatively slow. The vacuum oven has low internal pressure and a lower boiling point of water, which can speed up the drying speed and avoid the potential impact of high temperature on copper methionine, which is more conducive to maintaining product quality, but its cost is relatively high. In actual production, appropriate drying equipment can be selected according to production scale and product quality requirements. 2. Temperature control: The temperature setting of 105 degrees Celsius is not arbitrary. On the one hand, the temperature is sufficient to quickly evaporate the water in the copper methionine filter cake, shorten the drying time, and improve production efficiency. On the other hand, the temperature will not be too high to cause decomposition or denaturation of copper methionine, thereby ensuring product quality. In actual operation, a temperature controller can be used to monitor the internal temperature of the drying equipment in real time, and fine-tune it according to the actual situation to ensure that the temperature is stable within the set range and avoid excessive temperature fluctuations that may have adverse effects on the product. For example, a temperature alarm device can be set to sound an alarm when the temperature exceeds the set range to remind the operator to make timely adjustments. 3. Time control: The drying time of 1 to 2 hours is also the best range verified by multiple tests. If the drying time is too short, there will be too much residual moisture in the filter cake, which will affect the stability and storage performance of the product. If the drying time is too long, it will increase energy consumption, reduce production efficiency, and may even cause partial decomposition of copper methionine, affecting product quality. In actual operation, the drying time can be adjusted according to the moisture content of the filter cake, the performance of the drying equipment, and the quality requirements of the product. For example, the moisture content of the filter cake can be sampled regularly, and the drying can be stopped when the moisture content reaches the preset standard. 4. The importance of a sealed environment: Sealed drying equipment can effectively prevent external air from entering the oven, prevent copper methionine from reacting with oxygen, carbon dioxide, etc. in the air, thereby ensuring product purity and stability. In addition, a closed environment is also conducive to maintaining the temperature and humidity inside the oven stable and improving drying efficiency. For example, sealing strips can be installed at the seal of the drying equipment to ensure good sealing performance. The sealing of the drying equipment can also be checked regularly to promptly detect and deal with potential leakage problems. 5. Other auxiliary measures: In addition to the above points, some auxiliary measures can also improve drying efficiency and product quality. For example, the filter cake can be pre-treated before drying, such as crushing or compacting, to increase its specific surface area and accelerate water evaporation. During the drying process, the filter cake can be turned over regularly to ensure uniform heating and avoid local overheating or insufficient drying. After drying, the copper methionine product can be cooled and packaged to prevent it from absorbing moisture and deteriorating.Only through the above considerations and controls can the drying process of the copper methionine filter cake be ensured to be efficient and stable, and finally a copper methionine product that meets the quality requirements can be obtained.

[0064] Example 1

[0065] The saponified liquid (sodium methionine aqueous solution) used is added with 0.5 mol / L dilute sulfuric acid to acidify and exhaust, and the solution pH is adjusted to between 7.0 and 7.5. After diluting with water 1.5 times (concentration is 7% to 8%), 0.5 mol / L dilute sulfuric acid is added to acidify and exhaust under high temperature stirring conditions, and the solution pH is adjusted to between 7.0 and 7.5. Continue heating and stirring to exhaust for 1.5 hours, so that the carbonate and bicarbonate in the solution are discharged in the form of carbon dioxide and then add the same amount of water as the evaporation loss during high temperature exhaust. The solution temperature is maintained at 65 to 85 degrees Celsius, and a copper sulfate solution with a molar ratio of saponified liquid to copper sulfate of 2.0 / 1 is added for chelation. The chelating liquid pH will be between 2.80 and 4.27. The chelating time is 1 to 1.5 hours. If a large number of bubbles are generated, the chelating time is extended to 2 hours. Direct filtration, the filtrate enters the post-treatment process, the upper filter cake is washed with water several times, and then dried at 105 degrees Celsius to form a product. The chelation rate of the product is greater than 98%, the product is light sky blue and insoluble in water.

[0066] Example 2

[0067] The saponified liquid (sodium methionine aqueous solution) used is acidified and exhausted by adding 0.5 mol / L dilute sulfuric acid, and the pH of the solution is adjusted to between 7.0 and 7.5, and then water is added to dilute the concentration to 7% to 8%, and then stirred at high temperature for 1.5 hours, the temperature is maintained at 65 to 85 degrees Celsius, and a copper sulfate solution with a molar ratio of saponified liquid to copper sulfate of 2.05 / 1 is added, and the pH will be between 2.80 and 4.27. Chelate for 1 to 1.5 hours. Filter directly, and the filtrate enters the post-treatment process. The upper filter cake is washed with water several times, and then dried at 105 degrees Celsius to form a product. The product chelation rate is greater than 98%.

[0068] Example 3

[0069] The saponified liquid (sodium methionine aqueous solution) used is acidified and exhausted by adding 0.5 mol / L dilute sulfuric acid, and the pH of the solution is adjusted to between 7.0 and 7.5, and then water is added to dilute the concentration to 7% to 8%, and then stirred at high temperature for 1.5 hours. When the solution is at 65 to 85 degrees Celsius, a copper sulfate solution with a molar ratio of saponified liquid to copper sulfate of 2.2 / 1 is added, and the pH will be between 2.80 and 4.27. The chelation time is 1 to 1.5 hours. Directly filter, the filtrate enters the post-treatment process, the upper filter cake is washed with water several times, and then dried at 105 degrees Celsius to form a product. The product chelation rate is greater than 98%.

[0070] The invention discloses a method for preparing high-purity copper methionine. The method uses sodium methionine aqueous solution in the process of synthesizing methionine as raw material, and realizes efficient chelation of methionine and copper ions by accurately controlling key parameters such as pH value, temperature, reaction time, etc. First, the sodium methionine solution is adjusted to neutrality and carbon dioxide is removed, and then reacted with an excess copper sulfate solution at a suitable temperature. The pH value is strictly controlled between 2.80 and 4.27 during the entire chelation process to avoid the formation of copper hydroxide precipitation. After the reaction is completed, the copper methionine product with a light sky blue color is finally obtained through post-treatment processes such as centrifugation and drying. The product has the advantages of high chelation rate, stable properties, good solubility, etc. The invention solves the problems of incomplete chelation and low product purity in traditional methods, and significantly improves the production efficiency and product quality of copper methionine. At the same time, the recycling of the filtrate realizes the recycling of resources, which has good economic and environmental benefits.

[0071] The present invention further provides copper methionine prepared by the method for preparing copper methionine from the aforementioned methionine intermediate. Copper methionine is synthesized using sodium methionine, an intermediate product of synthesizing methionine, and anhydrous copper sulfate as raw materials. Preferably, the molar ratio of sodium methionine to copper sulfate is 2.05 to 1, the chelation temperature is 75 to 85 degrees Celsius, the pH is 2.80 to 4.27 (ph=2.80 to 4.27), the chelation rate is greater than or equal to 98%, and the yield is greater than 98%. The sodium methionine used in the present invention is an intermediate product in the process of synthesizing methionine. The copper methionine is light sky blue, has the property of slightly adhering to the cup wall, has stable properties, and after testing, the chelation rate of all copper methionines is greater than 98%, and the quality is good. Therefore, the use of sodium methionine to prepare copper methionine reduces the price of energy raw materials and reduces production costs.

[0072] The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technical personnel in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for preparing copper methionine from a methionine intermediate, characterized in that: include: Obtain sodium methionine solution and copper sulfate solution; Adjusting the pH of the sodium methionine solution, and then adjusting the concentration of the sodium methionine solution; adding the copper sulfate solution to the sodium methionine solution to carry out a chelating reaction to obtain a copper methionine solution; Separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate; The copper methionine filter cake is dried to obtain a copper methionine product.

2. The method for preparing copper methionine from a methionine intermediate according to claim 1, characterized in that: The step of adjusting the pH value of the sodium methionine solution comprises: Dilute sulfuric acid is added dropwise to the sodium methionine solution to adjust the pH of the sodium methionine solution to between 7.0 and 7.

5.

3. The method for preparing copper methionine from a methionine intermediate according to claim 2, characterized in that: The concentration of the sodium methionine solution is adjusted to 6% to 8%.

4. The method for preparing copper methionine from a methionine intermediate according to claim 3, characterized in that: The concentration of the sodium methionine solution is adjusted to 6% to 8% by adding water.

5. The method for preparing copper methionine from a methionine intermediate according to claim 4, characterized in that: After adjusting the pH value of the sodium methionine solution, the following steps are also included: The sodium methionine solution is heated and stirred to discharge carbonate and bicarbonate in the solution in the form of carbon dioxide.

6. The method for preparing copper methionine from a methionine intermediate according to claim 5, characterized in that: The step of heating and stirring the sodium methionine solution comprises: The sodium methionine solution was heated to 150 degrees Celsius and stirred for 1.5 hours.

7. The method for preparing copper methionine from a methionine intermediate according to claim 1 or 6, characterized in that: The step of adding the copper sulfate solution to the sodium methionine solution to carry out a chelating reaction comprises: Lowering the temperature of the sodium methionine solution to between 65 and 85 degrees Celsius; Adding the copper sulfate solution in a molar ratio of 2.0 / 1 to 2.2 / 1 to the sodium methionine; The pH of the chelation reaction is controlled between 2.80 and 4.27; The chelating reaction time was 1.5 hours.

8. The method for preparing copper methionine from a methionine intermediate according to claim 7, characterized in that: The method of separating the copper methionine solution comprises: Centrifugally separating the copper methionine solution to obtain a copper methionine filter cake and a filtrate; The filtrate is recycled.

9. The method for preparing copper methionine from a methionine intermediate according to claim 1, characterized in that: The method of drying the copper methionine filter cake comprises: The copper methionine filter cake is placed in a sealed drying device at 105 degrees Celsius and dried for 1 to 2 hours to obtain a copper methionine product.

10. Copper methionine prepared by the method for preparing copper methionine from a methionine intermediate according to any one of claims 1 to 9.

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