Method for decolorizing taurine and synchronously removing metal ions in taurine solution

Abstract

The invention relates to the technical field of chemical separation, in particular to a method for decolorizing taurine and synchronously removing metal ions in a taurine solution, which comprises the following steps: (1) preparing the taurine solution; (2) carrying out impurity content detection on the taurine solution, and recording initial content data of each impurity; (3) determining the optimal type selection of the activated carbon; (4) determining the optimal dosage of activated carbon; and (5) calculating the use amount of the activated carbon required by the taurine solution in the step (1) by combining the results in the steps (3) and (4), weighing the activated carbon with the corresponding mass, adding the activated carbon into the taurine solution for adsorption, and filtering and crystallizing the taurine solution to obtain a taurine product. According to the method, the optimal active carbon can be accurately selected according to the characteristics of the taurine solution, the optimal active carbon dosage is scientifically calculated based on the relation curve of the active carbon dosage and the metal ion removal rate, and the problem that an existing method excessively depends on experience or a single index to select the active carbon is solved.

Description

Technical Field

[0001] This invention relates to the field of chemical separation technology, and in particular to a method for decolorizing taurine and simultaneously removing metal ions from taurine solutions. Background Technology

[0002] Taurine, also known as 2-aminoethanesulfonic acid, is a sulfur-containing non-protein amino acid. Its molecular structure contains both amino and sulfonate functional groups, giving it rich chemical reactivity. Based on this characteristic, taurine, as an important organic compound, demonstrates indispensable application value in several key fields such as pharmaceutical manufacturing, food industry, and feed additives. Currently, the technology for the artificial synthesis of taurine is relatively mature, and the process flow is relatively stable. However, in actual production processes, raw materials or reaction catalysts may interact with the metal reactor during the reaction, introducing various metal ion impurities, including but not limited to Fe. 2+ Ni 2+ Cr 3+ Mn 2+ The presence of these metal ion impurities not only significantly reduces the purity of taurine products but may also pose a potential threat to their safety, thereby adversely affecting the performance of end products. Therefore, synthetic taurine typically requires activated carbon decolorization and purification to remove pigments and impurities.

[0003] Traditional methods for selecting activated carbon mainly rely on empirical judgment or single performance indicators, such as using iodine adsorption value as a standard for measuring microporous structure. This approach often lacks scientific rigor and systematic approach, particularly failing to adequately consider the physicochemical properties of taurine solutions, such as optimizing adsorption conditions based on taurine solubility. This results in inaccurate selection of activated carbon, leading to poor removal of metal ion impurities and failure to meet product purity requirements. Therefore, there is an urgent need to establish a scientific experimental method to determine the optimal dosage and type of activated carbon, providing data support for the taurine purification process.

[0004] This invention provides a method for decolorizing taurine and simultaneously removing metal ions from taurine solutions, thereby solving the problems of existing decolorization and metal ion removal methods that rely too heavily on experience or a single indicator to select activated carbon, resulting in poor metal ion removal effects. Summary of the Invention

[0005] The purpose of this invention is to provide a method for decolorizing taurine and simultaneously removing metal ions from taurine solutions, in order to solve the problems of existing decolorization and metal ion removal methods relying too much on experience or a single indicator to select activated carbon, resulting in poor metal ion removal effects.

[0006] The technical solution of this invention is: a method for decolorizing taurine and simultaneously removing metal ions from taurine solution, comprising the following steps: (1) Mix the taurine raw material with deionized water evenly to prepare a taurine solution; (2) Detect the impurity content of the taurine solution and record the initial content data of each impurity; (3) Take several equal volumes of taurine solution, add the same mass but different types of activated carbon to each portion of taurine solution one by one, stir, carry out the adsorption reaction, and then test the impurity content in each portion of solution, calculate the removal rate of metal ions by each activated carbon, and determine the best type of activated carbon. (4) Take several equal volumes of taurine solution, add different masses of the optimal activated carbon determined in step (3) to each portion of taurine solution, stir, carry out the adsorption reaction, and then test the impurity content in each portion of solution, plot the relationship curve between activated carbon dosage and metal ion removal rate, and determine the optimal dosage of activated carbon. (5) Based on the results in steps (3) and (4), calculate the amount of activated carbon required for the taurine solution in step (1), weigh the corresponding mass of activated carbon, add it to the taurine solution, stir continuously to carry out the adsorption reaction, and then filter and crystallize the taurine solution to obtain the taurine product.

[0007] Preferably, in step (3), the different types of activated carbon include activated carbon with different structural shapes and / or different raw materials; Activated carbon with different structural shapes can be any one or more of powdered activated carbon, granular activated carbon, and spherical activated carbon. Activated carbon made from different raw materials can be any one or more of the following: wood chips, fruit shells, coconut shells, aloe vera, and bamboo.

[0008] Preferably, the different types of activated carbon include powdered activated carbon made from different raw materials; the particle size of the powdered activated carbon is 10-325 mesh.

[0009] Preferably, in step (3), during the stirring process, the temperature of each portion of taurine solution is gradually increased from 20°C to 120°C in an equal gradient, so as to determine the optimal reaction temperature while determining the optimal type of activated carbon.

[0010] Preferably, in step (4), the amount of the optimally selected activated carbon added to each beaker increases in an equal gradient.

[0011] Preferably, in step (4), the stirring time of each taurine solution is gradually increased from 10 min to 200 min in an equal gradient, so as to determine the optimal amount of activated carbon and the optimal reaction time at the same time.

[0012] Preferably, in steps (3) and (4), when testing the impurity content of each solution, the solution is first filtered to remove activated carbon and impurity particles, and then the filtrate is tested for impurity content.

[0013] Preferably, in step (1), the taurine solution is an unsaturated solution prepared by continuous stirring under constant temperature water bath conditions of 0-100℃.

[0014] Preferably, in step (5), the filtration process involves using a filtration device to perform solid-liquid separation on the taurine solution to remove activated carbon residue and impurity particles from the solution. The crystallization process involves precipitating taurine crystals from the filtrate by cooling or evaporation concentration.

[0015] Preferably, the activated carbon residue can be reused 1-3 times after drying.

[0016] Compared with the prior art, the advantages of the present invention are: This invention provides a method for decolorizing taurine and simultaneously removing metal ions from taurine solutions. This method optimizes the processing steps and precisely selects the optimal activated carbon based on the characteristics of the taurine solution, such as the type and content of metal ion impurities. The optimal activated carbon dosage is scientifically calculated based on the relationship curve between activated carbon dosage and metal ion removal rate, solving the problem of existing decolorization and metal ion removal methods relying excessively on experience or single indicators for activated carbon selection. This method also efficiently removes metal ion impurities from taurine solutions while decolorizing, ensuring the high purity and safety of the taurine product and addressing the poor metal ion removal effect of existing methods. Furthermore, this method effectively avoids excessive use of activated carbon, reducing unnecessary resource consumption and significantly saving on taurine solution processing costs. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments: It should be noted that since the test solutions are all nearly saturated, crystals may precipitate when the temperature decreases, making it impossible to test directly on the testing instrument. Analysis showed that when diluted 25 times, the solution can maintain its state at room temperature without crystal precipitation. Therefore, in this application, all test data are the results after dilution 25 times.

[0018] A method for decolorizing taurine and simultaneously removing metal ions from taurine solution, the method comprising the following steps: (1) Accurately weigh a certain amount of taurine raw material, slowly add it to pure water, and continuously stir it under constant temperature water bath conditions of 0-100℃ to fully dissolve the taurine and mix it evenly to form a uniform taurine solution. Based on the characteristic that taurine is easy to precipitate, in order to ensure that the solution has high uniformity and stability, the taurine solution formed is preferably an unsaturated solution.

[0019] (2) High-precision analytical instruments, such as plasma spectrometer (ICP), inductively coupled plasma atomic emission spectrometer (ICP-AES), atomic absorption spectrophotometer (AAS), atomic absorption spectrometer, etc., are used to detect the taurine solution prepared in order to detect various impurities in the taurine solution and the content of each impurity. The initial content of various metal ion impurities in the solution is recorded in detail to provide accurate basic data for subsequent experimental effect evaluation. (3) Take several equal volumes of taurine solution and place them in beakers respectively; prepare the same number of activated carbon samples of different types but the same mass, and label them as activated carbon A, B, C, ...; then, add activated carbon A, activated carbon B, activated carbon C, ... to each beaker containing taurine solution one by one, and continuously stir the solution in each beaker at room temperature to ensure that the activated carbon and taurine solution are fully contacted and mixed, thereby promoting the adsorption reaction; at the same time, observe the changes in the solution during the stirring process, such as the taurine solution becoming lighter in color and increasing in transparency; after the adsorption is completed, pre-treat each solution first, and then detect the impurity content in each solution, that is, first pre-treat the solution in each beaker. Filtering is performed using a pre-treated microporous membrane to remove activated carbon particles. A suitable amount of filtrate is then diluted with deionized water to a suitable concentration and analyzed using the aforementioned analytical instruments. The preferred pore size of the microporous membrane is 0.45 μm. Based on the test results, the removal rate of metal ions for each type of activated carbon is calculated. The removal rate calculation formula is: Removal rate (%) = (Initial metal ion content − Post-adsorption metal ion content) / Initial metal ion content × 100%. While comparing the removal rates of different types of activated carbon, factors such as cost and source are comprehensively considered to select the activated carbon with a higher removal rate and lower cost as the optimal choice, ensuring that the optimal selection has higher feasibility and economy in practical applications. Different types of activated carbon include activated carbon with different structural shapes and / or different raw materials. Activated carbon with different structural shapes refers to powdered activated carbon, granular activated carbon, spherical activated carbon, etc. Activated carbon with different raw materials refers to activated carbon made from one or more of the following: wood chips, fruit shells, coconut shells, aloe vera, bamboo, etc. In this application, the different types of activated carbon are preferably powdered activated carbon made from different raw materials, and the particle size of the powdered activated carbon is preferably 10-325 mesh. In this step, during the stirring process, the temperature of each portion of taurine solution can be gradually increased in an equal gradient from 20°C, and can be raised to a maximum of 120°C, so as to determine the optimal reaction temperature while determining the optimal type of activated carbon.

[0020] (4) Take several equal volumes of taurine solution and place them in beakers respectively; weigh out 0.5g, 1g, 1.5g, ... of the optimal type of activated carbon in an equal gradient manner, or weigh out several portions of the optimal type of activated carbon of different masses in other gradient manner, and add the weighed activated carbon to each beaker one by one; stir continuously at room temperature to carry out the adsorption reaction so that the activated carbon can fully adsorb metal ions; after the adsorption is completed, filter the solution in each beaker through a pre-treated microporous filter membrane to remove activated carbon particles, then take an appropriate amount of filtrate, dilute it with deionized water to a suitable concentration, and use the above-mentioned analytical instrument to detect the metal ion content; according to the detection results, draw the relationship curve between the amount of activated carbon and the metal ion removal rate; through the analysis curve, determine the amount of activated carbon when the metal ion removal rate reaches the highest and tends to be stable, and this amount is the optimal amount of activated carbon; at the same time, observe the decolorization effect of taurine solution under different amounts to ensure that good decolorization is achieved while removing metal ions. In this step, the stirring time for each portion of taurine solution can be gradually increased in an equal gradient from 10 minutes to determine the optimal amount of activated carbon and the optimal reaction time; the stirring time can be extended to a maximum of 200 minutes.

[0021] (5) Combining the experimental results of steps (3) and (4), accurately calculate the amount of activated carbon required for the taurine solution prepared in step (1); then, accurately weigh the corresponding mass of activated carbon and slowly add it to the taurine solution, stirring continuously at room temperature to ensure that the activated carbon and solution are fully in contact and mixed for adsorption reaction; after adsorption is complete, filter the solution through a multi-layer filter paper or plate and frame filter press to further remove activated carbon residue and other impurity particles, obtaining a relatively pure taurine filtrate; the filtered solution... The activated carbon obtained can be reused 1-3 times after drying. The filtrate is transferred to a crystallization container and crystallized using methods such as slow cooling or evaporation concentration. During crystallization, the cooling rate or evaporation rate is controlled to obtain larger and more regular taurine crystals. After crystallization, a vacuum filtration device is used to separate the taurine crystals from the mother liquor, and the crystals are collected. The collected crystals are placed in a drying oven and dried at a temperature of 80-150℃ until the moisture content of the crystals reaches the specified standard, thus obtaining the final taurine product. This optimized method allows for a more scientific and accurate determination of the type and amount of activated carbon used, effectively improving the decolorization effect and metal ion removal rate of the taurine solution, thereby obtaining a high-quality taurine product that meets actual production and market demands.

[0022] The following experiments were conducted using commercially available taurine raw material to verify that the method for decolorizing taurine and simultaneously removing metal ions from taurine solution provided in this application has excellent decolorization effect and metal ion removal rate. Since the commercially available taurine raw material contains relatively few coated metal impurities, to better demonstrate the superior effect of the decolorization and simultaneous impurity removal method provided in this application, metal ion impurities were introduced into the prepared taurine solution in the following examples.

[0023] Example 1

[0024] (1) Weigh 10g of taurine raw material and slowly add it to pure water. Stir continuously under a constant temperature water bath at 45℃ to fully dissolve the taurine and prepare a uniform taurine solution. Then, transfer the prepared taurine solution to a beaker. Under a constant temperature water bath at 55℃, slowly insert the 316L metal plate that has been washed with alkali and dried into the solution in the beaker and completely submerge the metal plate in the solution so that the contact area between the metal plate and the taurine solution is slightly larger than the actual working conditions, thereby promoting the full reaction between the metal plate and the taurine to introduce metal ion impurities into the taurine solution. After standing for 1 hour, 2L of taurine solution to be treated is obtained.

[0025] (2) The taurine solution to be treated was detected by atomic absorption spectrometry, and the contents of various metal ion impurities in the solution were recorded in detail to provide accurate basic data for subsequent experimental effect evaluation.

[0026] (3) Take three 10 mL portions of taurine solution and place them in beakers respectively; prepare three portions of activated carbon a, activated carbon b, and activated carbon c, each with a mass of 0.1 g; add activated carbon a, activated carbon b, and activated carbon c to the three beakers containing taurine solution one by one, stir the solution in each beaker at room temperature, and observe the changes in the solution during the stirring process; after the adsorption is completed, filter the three portions of solution with a microporous filter membrane with a pore size of preferably 0.45 μm, and then dilute the three portions of filtrate to a suitable concentration and test them. The test results are shown in Table 1; based on the test results, calculate the removal rate of metal ions for each type of activated carbon, and comprehensively consider the cost, source, and other factors of activated carbon, select activated carbon b with a higher removal rate and lower cost as the best choice; among them, activated carbon a is granular activated carbon made from fruit shells, activated carbon b is powdered activated carbon made from fruit shells, and activated carbon c is granular activated carbon made from wood chips.

[0027] Table 1. Adsorption efficiency of different types of activated carbon of the same mass

[0028] (4) Take two 10 mL portions of taurine solution and place them in beakers respectively; weigh two portions of activated carbon b with masses of 0.05 g and 0.3 g respectively, and add the weighed activated carbon b to the two beakers respectively; stir continuously at room temperature to carry out the adsorption reaction; after the adsorption is completed, filter the solution in each beaker through a pre-treated microporous filter membrane to remove activated carbon particles, and then dilute the two filtrates to a suitable concentration and test them. The test results are shown in Table 2; based on the test results and combined with the test results in step (3), draw the relationship curve between the amount of activated carbon and the metal ion removal rate; by analyzing the curve and combined with the observed decolorization effect of taurine solution at different dosages, determine the optimal dosage of activated carbon when the metal ion removal rate reaches the highest and tends to be stable, that is, determine that 1 g of activated carbon b is added to every 100 mL of taurine solution. This dosage can also achieve a good decolorization effect.

[0029] Table 2. Adsorption efficiency of optimally selected activated carbon for different qualities

[0030] (5) Based on the experimental results of steps (3) and (4), accurately calculate the amount of activated carbon required for the taurine solution prepared in step (1), and accurately weigh the corresponding mass of activated carbon; slowly add it to the taurine solution, and continuously stir at room temperature to carry out the adsorption reaction; after the adsorption is completed, filter the solution through multiple layers of filter paper to further remove the activated carbon residue and other impurity particles, and obtain a relatively pure taurine filtrate, and take a small amount of pure taurine filtrate for testing; then, transfer the filtrate to a crystallization container and crystallize it by slow cooling; after crystallization, use a vacuum filtration device to separate the taurine crystals from the mother liquor, and place the separated crystals in a drying oven to dry them at a temperature of 100°C until the water content of the crystals reaches the specified standard, and finally obtain the taurine product, P1.

[0031] Example 2

[0032] (1) Weigh 10g of taurine raw material and slowly add it to pure water. Stir continuously under constant temperature water bath at 55℃ to fully dissolve the taurine and prepare a uniform taurine solution. Then, transfer the prepared taurine solution to a beaker. Under constant temperature water bath at 55℃, slowly insert the 316L metal plate that has been alkali washed and dried into the solution in the beaker and make the metal plate completely submerged in the solution. This makes the contact area between the metal plate and the taurine solution slightly larger than the actual working conditions, so that the metal plate reacts fully with the taurine to introduce metal ion impurities into the taurine solution. After standing for 1 hour, 2L of taurine solution to be treated is obtained.

[0033] (2) The taurine solution to be treated was detected by atomic absorption spectrometry, and the contents of various metal ion impurities in the solution were recorded in detail to provide accurate basic data for subsequent experimental effect evaluation.

[0034] (3) Take two 10 mL portions of taurine solution and place them in beakers respectively; prepare two portions of activated carbon d and activated carbon e, each weighing 0.5 g; add activated carbon d and activated carbon e to the beakers containing taurine solution respectively, stir the solutions in each beaker at room temperature, and observe the changes in the solutions during the stirring process; after the adsorption is completed, filter the two solutions separately using a microporous membrane with a pore size of 0.45 μm, and then dilute the two filtrates to a suitable concentration and test them respectively; the test results are shown in Table 3; based on the test results, calculate the removal rate of metal ions for each type of activated carbon, and comprehensively consider the cost, source and other factors of activated carbon, select activated carbon e with a higher removal rate and lower cost as the best choice; among them, activated carbon e is a powdered activated carbon made from fruit shells and wood chips, and activated carbon e is a powdered activated carbon made from coconut shells.

[0035] Table 3. Adsorption efficiency of different types of activated carbon with the same mass

[0036] (4) Take two 10 mL portions of taurine solution and place them in beakers respectively; weigh two portions of the optimal activated carbon e with masses of 0.1 g and 0.2 g respectively, and add the weighed activated carbon e to the two beakers respectively; stir continuously at room temperature to carry out the adsorption reaction so that the activated carbon can fully adsorb metal ions; after the adsorption is completed, filter the solution in each beaker through a microporous filter membrane to remove activated carbon particles, and then dilute the two filtrates to a suitable concentration and test them. The test results are shown in Table 4; based on the test results and combined with the test results in step (3), draw the relationship curve between the amount of activated carbon and the metal ion removal rate; by analyzing the curve and combined with the observed decolorization effect of taurine solution at different dosages, determine the amount of activated carbon when the metal ion removal rate reaches the highest and tends to be stable, that is, determine that 1 g of activated carbon e is added to every 100 mL of taurine solution. This dosage is the optimal dosage of activated carbon.

[0037] Table 4. Adsorption efficiency of optimally selected activated carbon for different qualities

[0038] (5) Based on the experimental results of steps (3) and (4), accurately calculate the amount of activated carbon e required for the taurine solution prepared in step (1), and accurately weigh the corresponding mass of activated carbon e; slowly add it to the taurine solution, and continuously stir at room temperature to carry out the adsorption reaction; after the adsorption is completed, filter the solution through a plate and frame filter press to obtain filter residue and relatively pure taurine filtrate, and take a small amount of pure taurine filtrate for testing; then, dry the filter residue and recycle it, transfer the filtrate to a crystallization container, and crystallize it by slow cooling; after crystallization, use a vacuum filtration device to separate the taurine crystals from the mother liquor and place the separated crystals in a drying oven, and dry them at a temperature of 120°C until the water content of the crystals reaches the specified standard, and finally obtain the taurine product, P2.

[0039] The activated carbon e used in Example 2 was dried and reused several times. The content of each metal ion impurity in the filtrate was detected each time it was used. The test results are shown in Table 5.

[0040] Table 5. Removal effect of activated carbon e when reused in Example 2

[0041] As shown in Table 5, in Example 2, activated carbon e still had a good adsorption effect in the first two reuses, and the content of metal ion impurities in its filtrate was low, meeting the standard requirements. However, after being reused more than three times, the adsorption effect of activated carbon e gradually decreased. This demonstrates that the method for decolorizing taurine and simultaneously removing metal ions from taurine solution provided in this application can not only accurately select the best type of activated carbon and determine the optimal amount of activated carbon for decolorization, enabling the activated carbon to efficiently remove metal ion impurities from taurine solution while decolorizing, but also clearly define the number of times the activated carbon can be reused.

[0042] In practical applications, there are usually standard requirements for the chloride ion impurity content in taurine, that is, the chloride ion content needs to be controlled within 0.1%. To determine whether the chloride ion content in the taurine products P1 and P2 obtained in Examples 1 and 2 meets the standard, titration was used to test them. Specifically, taurine products P1 and P2 obtained in Examples 1 and 2 were taken and prepared into sample solutions of the same concentration, and placed in test tubes respectively. Then, AgNO3 solution was added to the test tubes, and the solution was shaken evenly to observe the color change. The test results are shown in Table 6.

[0043] Table 6. Chloride ion content in taurine products P1 and P2

[0044] As shown in Table 6, the chloride ion content in taurine products P1 and P2 obtained in Examples 1 and 2 both meet the standard requirements. This demonstrates that the method for decolorizing taurine and simultaneously removing metal ions from taurine solution provided in this application does not introduce new impurities, such as chloride ions or other negative ion impurities, while decolorizing and removing metal ion impurities; it can also remove chloride ion impurities to a certain extent.

[0045] Furthermore, the method for decolorizing taurine and simultaneously removing metal ions from taurine solutions provided in this application can precisely select the most suitable type of activated carbon based on the characteristics of the taurine solution to be treated, thereby significantly improving the removal efficiency of metal ion impurities in the taurine solution and ensuring the purity and quality of the taurine product. Moreover, based on the relationship curve between activated carbon dosage and metal ion removal rate, the optimal dosage of activated carbon can be scientifically determined, which can not only effectively avoid the excessive use of activated carbon and reduce unnecessary resource consumption, but also significantly save the treatment cost of taurine solution, achieving a win-win situation for both economic and environmental benefits.

[0046] The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

Claims

1. A method for decolorizing taurine and simultaneously removing metal ions from taurine solution, characterized in that, Includes the following steps: (1) Mix the taurine raw material with deionized water evenly to prepare a taurine solution; (2) Detect the impurity content of the taurine solution and record the initial content data of each impurity; (3) Take several equal volumes of taurine solution, add the same mass but different types of activated carbon to each portion of taurine solution one by one, stir, carry out the adsorption reaction, and then test the impurity content in each portion of solution, calculate the removal rate of metal ions by each activated carbon, and determine the best type of activated carbon. (4) Take several equal volumes of taurine solution, add different masses of the optimal activated carbon determined in step (3) to each portion of taurine solution, stir, carry out the adsorption reaction, and then test the impurity content in each portion of solution, plot the relationship curve between activated carbon dosage and metal ion removal rate, and determine the optimal dosage of activated carbon. (5) Based on the results in steps (3) and (4), calculate the amount of activated carbon required for the taurine solution in step (1), weigh the corresponding mass of activated carbon, add it to the taurine solution, stir continuously to carry out the adsorption reaction, and then filter and crystallize the taurine solution to obtain the taurine product.

2. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 1, characterized in that: In step (3), the different types of activated carbon include activated carbon with different structural shapes and / or different raw materials; Activated carbon with different structural shapes can be any one or more of powdered activated carbon, granular activated carbon, and spherical activated carbon. Activated carbon made from different raw materials can be any one or more of the following: wood chips, fruit shells, coconut shells, aloe vera, and bamboo.

3. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: The different types of activated carbon include powdered activated carbon made from different raw materials; the particle size of the powdered activated carbon is 10-325 mesh.

4. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: In step (3), during the stirring process, the temperature of each portion of taurine solution is gradually increased from 20°C to 120°C in an equal gradient, so as to determine the optimal reaction temperature while determining the optimal type of activated carbon.

5. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: In step (4), the amount of the optimal activated carbon added to each beaker increases in an equal gradient.

6. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 5, characterized in that: In step (4), the stirring time of each taurine solution is gradually increased from 10 min to 200 min in an equal gradient, so as to determine the optimal amount of activated carbon and the optimal reaction time.

7. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: In steps (3) and (4), when testing the impurity content of each solution, the solution is first filtered to remove activated carbon and impurity particles, and then the filtrate is tested for impurity content.

8. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: In step (1), the taurine solution is an unsaturated solution prepared by continuous stirring under constant temperature water bath conditions of 0-100℃.

9. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 2, characterized in that: In step (5), the filtration process involves using a filtration device to perform solid-liquid separation on the taurine solution to remove activated carbon residue and impurity particles from the solution. The crystallization process involves precipitating taurine crystals from the filtrate by cooling or evaporation concentration.

10. The method for decolorizing taurine and simultaneously removing metal ions from taurine solution according to claim 8, characterized in that: The activated carbon residue can be reused 1-3 times after drying.

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