Amino acid hydrolysate acid removal process using indirect MVR evaporation

Abstract

The application discloses an amino acid hydrolysate acid removal process using indirect MVR evaporation, and particularly relates to the technical field of amino acid hydrolysate acid removal processes, and comprises the following steps: S1, amino acid hydrolysate conveying, S2, hydrolysate evaporation under reduced pressure, S3, acid substance gas-liquid separation, S4, secondary steam conveying, and S5, liquid storage. The acid substance in the amino acid hydrolysate is evaporated and acid removal treated by adopting the MVR evaporation technology, so that the hydrolysate can form concentrated liquid and acid substance after being separated under reduced pressure, the generated acid substance is separated by a gas-liquid separator, and acid liquid and secondary steam are generated, the secondary steam can provide a secondary steam source for an evaporator after being compressed by a compressor, thereby providing a large amount of steam source for the evaporator, reducing the emission of acid gas, improving the resource utilization rate, achieving the protection of the environment, and avoiding the harm of acid gas to the human body.

Description

Technical Field

[0001] This invention belongs to the field of amino acid hydrolysate acid removal technology, and particularly relates to an amino acid hydrolysate acid removal process utilizing indirect MVR evaporation. Background Technology

[0002] Amino acids are organic compounds containing basic amino and acidic carboxyl groups. They are compounds formed when the hydrogen atoms on the carbon atoms of carboxylic acids are replaced by amino groups. Amino acids need to undergo hydrolysis during preparation. In order to reduce the acid concentration inside the amino acid hydrolysate, mechanical energy is required to remove the acid from the amino acid hydrolysate.

[0003] Currently, there are various methods for removing acid, such as hot plate acid removal devices and water bath acid removal. Hot plate acid removal devices use hot plates to heat the reagent, thereby evaporating the acidic substances inside the reagent at high temperature to achieve the effect of removing acid. Water bath acid removal involves placing the reagent in a 100°C water bath and heating it to achieve the purpose of removing acid. The effects of the two methods are almost the same.

[0004] For example, the invention patent with patent application publication number CN202010309535.2 discloses a rare earth solution preparation process that can quickly and efficiently remove acid. It discloses that the acid removal process is carried out on the substance by a temperature-controlled acid removal instrument, and the effect is the same as that of an electric hot plate acid removal instrument.

[0005] Since amino acid hydrolysates contain acidic substances, heating the reagents with an acid-removing device can remove acid to some extent. However, this method has a long cycle, consumes a large amount of electricity, and the resources cannot be recycled. Furthermore, heating can easily break the molecular structure of amino acids, and using a hot plate to evaporate the reagents at high temperatures results in the emission of large amounts of acidic gases, causing significant environmental pollution. These acidic gases can also cause some degree of harm to the human body. Therefore, this invention proposes an acid-removing process for amino acid hydrolysates using indirect MVR evaporation. Summary of the Invention

[0006] This invention provides an acid removal process for amino acid hydrolysates using indirect MVR evaporation. It aims to address the problems of methods that rely on heating reagents with an acid removal device. While this method can achieve acid removal to some extent, it suffers from long cycles, high electricity consumption, and the inability to recycle the resources. Furthermore, heating can easily break down the molecular structure of amino acids, and the high-temperature evaporation of reagents using hot plates results in the emission of large amounts of acidic gases, causing significant environmental pollution and potential harm to human health.

[0007] This invention is implemented as follows: A process for removing acid from amino acid hydrolysate using indirect MVR evaporation is provided, specifically including the following steps:

[0008] S1. Place the amino acid hydrolysate inside the storage tank and use a circulation pump to transport the amino acid hydrolysate to the inside of the evaporator. The liquid distributor inside the evaporator transports the hydrolysate to the inside of multiple heat exchange tubes and forms a liquid film on the inner wall of the heat exchange tubes, so that the hydrolysate flows from top to bottom from the inside of the heat exchange tubes. At the same time, the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tubes under reduced pressure.

[0009] S2. After the high-temperature steam inside the evaporator evaporates the hydrolysate inside the heat exchange tube, the hydrolysate reaches the bottom of the heat exchange tube, and the acidic substances inside the hydrolysate are separated from the hydrolysate after being evaporated by the high-temperature steam.

[0010] S3. Secondary steam is transported through pipeline to the interior of the gas-liquid separator. In the gas-liquid separator, the acidic liquid droplets entrained in the secondary steam are removed, allowing the pure secondary steam to be transported from the interior of the gas-liquid separator to the compressor.

[0011] S4. The compressor compresses the secondary steam and delivers it as heating steam to the shell side of the heat exchanger as a heat source for the evaporator.

[0012] S5. The purified hydrolysate after acid removal is located at the bottom of the inner cavity of the evaporator, while the acidic substances are separated into gas and liquid by the gas-liquid separator. The liquid of the acidic substances is located at the bottom of the gas-liquid evaporator, thus realizing the separation of acidic substances inside the hydrolysate.

[0013] In a preferred embodiment, in S1, the liquid distributor is connected to multiple heat exchange tubes, the evaporation temperature inside the evaporator is 40-60°C, and the circulating pump delivers the hydrolysate to the inside of the evaporator at a flow rate of 4-6 kg / h.

[0014] In a preferred embodiment, in S2, the hydrolysate can be separated into a concentrated liquid and an acidic liquid after being evaporated by high-temperature steam. At the same time, the acidic liquid is vaporized by high-temperature steam to form a secondary steam gas.

[0015] In a preferred embodiment, in S3, the gas-liquid separator uses gravity settling to separate the acidic liquid inside the acidic vapor from the gas, causing the liquid to fall due to gravity and the gas to be transported.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By improving resource utilization, the hydrolysate after evaporation forms a concentrated liquid and acidic substances. The acidic substances are then separated into acidic liquid and secondary steam by a gas-liquid separator. The secondary steam after the acidic materials are separated is compressed and sent back to the evaporator for reuse, thereby reducing resource loss. The acidic liquid produced after the separation of acidic substances is stored, and the secondary steam separated from the acidic substances is utilized, thereby reducing the large-scale emission of acidic gases, reducing environmental pollution, and preventing the harm of acidic toxic gases to the human body.

[0018] 2. By employing MVR evaporation technology in the process operation to perform reduced-pressure evaporation and acid removal treatment on the acidic substances inside the amino acid hydrolysate, the conventional acid removal process of amino acid hydrolysate can be met, and the expected acid removal effect can be achieved. At the same time, by performing reduced-pressure evaporation treatment on the hydrolysate concentrate after initial acid removal multiple times, the acidity range inside the hydrolysate can be reduced, achieving a good acid removal effect. Secondly, the acidic substances inside the hydrolysate are separated by reduced-pressure evaporation, which can reduce the damage to the molecular structure inside the amino acids. The acid removal is carried out in a vacuum environment, which reduces the oxidation reaction of the hydrolysate. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the overall process flow of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] Example 1

[0022] An acid removal process for amino acid hydrolysate using indirect MVR evaporation specifically includes the following steps:

[0023] S1. The amino acid hydrolysate is placed inside the storage tank. The hydrolysate is transported to the evaporator at a flow rate of 4 kg / h using a circulation pump. The distributor inside the evaporator delivers the hydrolysate to multiple heat exchange tubes and forms a liquid film on the inner wall of the heat exchange tubes. The hydrolysate flows from top to bottom inside the heat exchange tubes. At the same time, the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tubes under reduced pressure. The temperature inside the evaporator is controlled at 45℃.

[0024] S2. After the high-temperature steam inside the evaporator evaporates the hydrolysate inside the heat exchange tube, the hydrolysate reaches the bottom of the heat exchange tube. The acidic substances inside the hydrolysate are separated from the hydrolysate after being evaporated by the high-temperature steam, and can then be separated into concentrated liquid and acidic liquid. At the same time, the acidic liquid is vaporized by the high-temperature steam to form secondary steam gas.

[0025] S3. Secondary steam is transported through pipeline to the interior of the gas-liquid separator. In the gas-liquid separator, the acidic liquid droplets entrained in the secondary steam are removed, allowing the pure secondary steam to be transported from the interior of the gas-liquid separator to the compressor. The gas-liquid separator uses gravity settling to separate the acidic liquid inside the acidic steam from the gas, causing the liquid to fall due to gravity and the gas to be transported.

[0026] S4. The compressor compresses the secondary steam and delivers it as heating steam to the shell side of the heat exchanger as a heat source for the evaporator.

[0027] S5. The purified hydrolysate after acid removal treatment is located at the bottom of the inner cavity of the evaporator (the measured acidity value is 6%), while the acidic substances are separated into gas and liquid by the gas-liquid separator. The liquid of the acidic substances is located at the bottom of the gas-liquid evaporator, thus realizing the separation of acidic substances inside the hydrolysate.

[0028] Example 2

[0029] An acid removal process for amino acid hydrolysate using indirect MVR evaporation specifically includes the following steps:

[0030] S1. Place the amino acid hydrolysate inside the storage tank and use a circulation pump to deliver the amino acid hydrolysate to the evaporator at a flow rate of 5 kg / h. The liquid distributor inside the evaporator delivers the hydrolysate to multiple heat exchange tubes and forms a liquid film on the inner wall of the heat exchange tubes, allowing the hydrolysate to flow from top to bottom inside the heat exchange tubes. At the same time, the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tubes under reduced pressure. The temperature inside the evaporator is controlled at 50°C.

[0031] S2. After the high-temperature steam inside the evaporator evaporates the hydrolysate inside the heat exchange tube, the hydrolysate reaches the bottom of the heat exchange tube. The acidic substances inside the hydrolysate are separated from the hydrolysate after being evaporated by the high-temperature steam, and can then be separated into concentrated liquid and acidic liquid. At the same time, the acidic liquid is vaporized by the high-temperature steam to form secondary steam gas.

[0032] S3. Secondary steam is transported through pipeline to the interior of the gas-liquid separator. In the gas-liquid separator, the acidic liquid droplets entrained in the secondary steam are removed, allowing the pure secondary steam to be transported from the interior of the gas-liquid separator to the compressor. The gas-liquid separator uses gravity settling to separate the acidic liquid inside the acidic steam from the gas, causing the liquid to fall due to gravity and the gas to be transported.

[0033] S4. The compressor compresses the secondary steam and delivers it as heating steam to the shell side of the heat exchanger as a heat source for the evaporator.

[0034] S5. The purified hydrolysate after acid removal is located at the bottom of the inner cavity of the evaporator, while the acidic substances are separated into gas and liquid by the gas-liquid separator. The liquid of the acidic substances is located at the bottom of the gas-liquid evaporator, thus realizing the separation of acidic substances inside the hydrolysate.

[0035] S6. The hydrolysate that has undergone acid removal treatment is discharged and transported back to the interior of the evaporator for reduced pressure evaporation treatment, with a final acidity value of 3%.

[0036] In this embodiment, unlike the previous embodiment, in s6, the hydrolysate after initial acid removal is evaporated again through an evaporator, which can improve the acid removal effect of the hydrolysate. The temperature parameters inside the evaporator are different, but everything else is the same as in embodiment 1.

[0037] Example 3

[0038] An acid removal process for amino acid hydrolysate using indirect MVR evaporation specifically includes the following steps:

[0039] S1. The amino acid hydrolysate is placed inside the storage tank. The hydrolysate is transported to the evaporator at a flow rate of 6 kg / h using a circulation pump. The distributor inside the evaporator delivers the hydrolysate to multiple heat exchange tubes and forms a liquid film on the inner wall of the heat exchange tubes. The hydrolysate flows from top to bottom inside the heat exchange tubes. At the same time, the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tubes under reduced pressure. The temperature inside the evaporator is controlled at 55℃.

[0040] S2. After the high-temperature steam inside the evaporator evaporates the hydrolysate inside the heat exchange tube, the hydrolysate reaches the bottom of the heat exchange tube. The acidic substances inside the hydrolysate are separated from the hydrolysate after being evaporated by the high-temperature steam, and can then be separated into concentrated liquid and acidic liquid. At the same time, the acidic liquid is vaporized by the high-temperature steam to form secondary steam gas.

[0041] S3. Secondary steam is transported through pipeline to the interior of the gas-liquid separator. In the gas-liquid separator, the acidic liquid droplets entrained in the secondary steam are removed, allowing the pure secondary steam to be transported from the interior of the gas-liquid separator to the compressor. The gas-liquid separator uses gravity settling to separate the acidic liquid inside the acidic steam from the gas, causing the liquid to fall due to gravity and the gas to be transported.

[0042] S4. The compressor compresses the secondary steam and delivers it as heating steam to the shell side of the heat exchanger as a heat source for the evaporator.

[0043] S5. The purified hydrolysate after acid removal is located at the bottom of the inner cavity of the evaporator, while the acidic substances are separated into gas and liquid by the gas-liquid separator. The liquid of the acidic substances is located at the bottom of the gas-liquid evaporator, thus realizing the separation of acidic substances inside the hydrolysate.

[0044] In this embodiment, the difference from Embodiment 1 and Embodiment 2 is that the temperature parameters inside the evaporator and the rate of hydrolysate delivery are different, while everything else is the same as in Embodiment 1 and Embodiment 2.

[0045] Furthermore, in this embodiment of the invention, MVR evaporation technology is mainly used to remove acid from the amino acid hydrolysate, so that the acidity of the hydrolysate is below 5%. If the test results show that the acidity of the hydrolysate is above 5%, the hydrolysate concentrate that has undergone the initial acid removal treatment needs to be subjected to reduced pressure acid removal treatment again through the evaporator. After each concentration, the acidity value needs to be tested, and the result should be below 5%.

[0046] Performance testing:

[0047] For the acid removal process of amino acid hydrolysate using MVR evaporation technology in Examples 1-3 above, the performance of the concentrated hydrolysate after acid removal was tested, and the results are shown in the table below:

[0048]

[0049]

[0050] According to the data in the table above, the acidity range of Example 2 is significantly lower than that of Example 1 and Example 2, indicating that the acid removal effect of Example 2 on amino acid hydrolysate is significantly better than that of Example 1 and Example 3. However, the time consumed is also longer than that of Example 1-3. Moreover, after the hydrolysate is removed by depressurization, a pure hydrolysate concentrate can be retained.

[0051] Therefore, the above data proves that in this invention, by using MVR evaporation technology to evaporate and remove acid from the acidic substances inside the amino acid hydrolysate, the conventional acid removal process of the amino acid hydrolysate can be met, and the expected acid removal effect can be achieved. At the same time, by performing multiple vacuum evaporation treatments on the hydrolysate concentrate after initial acid removal, the acidity range inside the hydrolysate can be reduced, achieving a good acid removal effect.

[0052] Secondly, the acidic substances produced after acid removal can be separated by a gas-liquid separator, separating the acidic liquid and acidic gas inside the acidic substances. After the acidic liquid is separated, pure secondary steam is generated, which can provide secondary steam power for the evaporator. After the acidic gas of the acidic substances is separated, the acidic liquid produced can be stored. This can provide a large amount of steam source for the evaporator while reducing the emission of acidic gas, improving resource utilization, protecting the environment, and avoiding harm to the human body from acidic gases.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for removing acid from amino acid hydrolysate using indirect MVR evaporation, characterized in that: Specifically, the following steps are included: S1. The amino acid hydrolysate is placed inside the storage tank. A circulating pump is used to transport the amino acid hydrolysate to the inside of the evaporator. The liquid distributor inside the evaporator transports the hydrolysate to the inside of multiple heat exchange tubes and forms a liquid film on the inner wall of the heat exchange tubes. The hydrolysate flows from top to bottom inside the heat exchange tubes. At the same time, the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tubes under reduced pressure. The liquid distributor is connected to multiple heat exchange tubes. The evaporation temperature inside the evaporator is 40-60℃, and the circulating pump transports the hydrolysate to the inside of the evaporator at a flow rate of 4-6 kg / h. S2. After the steam inside the evaporator evaporates the hydrolysate inside the heat exchange tube, the hydrolysate reaches the bottom of the heat exchange tube, and the acidic substances inside the hydrolysate are separated from the hydrolysate after being evaporated by the steam. S3. Secondary steam is transported through pipeline to the interior of the gas-liquid separator. In the gas-liquid separator, the acidic liquid droplets entrained in the secondary steam are removed, allowing the pure secondary steam to be transported from the interior of the gas-liquid separator to the compressor. S4. The compressor compresses the secondary steam and delivers it as heating steam to the shell side of the heat exchanger as a heat source for the evaporator. S5. The purified hydrolysate after acid removal is located at the bottom of the inner cavity of the evaporator, while the acidic substances are separated into gas and liquid by the gas-liquid separator. The liquid of the acidic substances is located at the bottom of the gas-liquid evaporator, thus realizing the separation of acidic substances inside the hydrolysate.

2. The process for removing acid from amino acid hydrolysate using indirect MVR evaporation according to claim 1, characterized in that: In S2, the hydrolysate can be separated into concentrated liquid and acidic liquid after being evaporated by steam. At the same time, the acidic liquid is vaporized by steam to form secondary steam gas.

3. The process for removing acid from amino acid hydrolysate using indirect MVR evaporation according to claim 1, characterized in that: In S3, the gas-liquid separator uses gravity settling to separate the acidic liquid inside the acidic vapor from the gas, causing the liquid to fall due to gravity and the gas to be transported.

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