Hydrochloric acid recovery device for L-tyrosine production

Abstract

The utility model relates to a hydrochloric acid recovery device for L-tyrosine production. The device comprises a hydrolysis unit, an extraction unit, a distillation unit and an evaporation unit, the hydrolysis unit comprises a hydrolysis kettle; the extraction unit comprises an extraction tank, the extraction tank is arranged at the later stage of the hydrolysis kettle, a connecting crane pipe is arranged between the hydrolysis kettle and the extraction tank, and the distillation unit comprises a distillation tank arranged at the later stage of the extraction tank; the evaporation unit comprises a film evaporator arranged behind the extraction tank; acid-containing tail gas and acid-containing hydrolysate of the hydrolysis kettle can be recycled by connecting the crane pipe and the lifting pipe on the crane pipe, amino acid liquid and hydrochloric acid liquid in the acid-containing tail gas and the acid-containing hydrolysate are extracted and layered by the extraction tank, and the amino acid liquid and the hydrochloric acid liquid are evaporated and concentrated by the distillation unit and the evaporation unit; on one hand, the difficulty of subsequent amino acid liquid purification is reduced, and on the other hand, the pollution problem caused by direct emission of acid-containing tail gas in the hydrolysis kettle is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of amino acid production and processing, in particular to a hydrochloric acid recovery device for L-tyrosine production. Background Technique

[0002] In the traditional production process of L-tyrosine, animal hair is generally used as the raw material for extracting L-tyrosine. During extraction, the animal hair needs to be hydrolyzed, and a large amount of hydrochloric acid is required for hydrolysis. Hydrochloric acid waste gas and hydrochloric acid waste liquid will be generated during the hydrolysis process. The hydrochloric acid waste gas generally comes from the hydrolysis kettle during the hydrolysis operation, and the hydrochloric acid waste liquid is the remaining hydrochloric acid that has not reacted with the animal hair in the hydrolysis kettle after the hydrochloric acid is saturated. In the past process, these two parts of hydrochloric acid were separated after all amino acid processing procedures were completed. However, if this excess hydrochloric acid is not recovered in advance, on the one hand, it will occupy the production space in the hydrolysis kettle, on the other hand, it will affect the efficiency of subsequent amino acid purification operations, and excessive hydrochloric acid residues may also increase the treatment difficulty and affect the quality of the final product.

[0003] Therefore, recovering and treating the hydrochloric acid waste gas and hydrochloric acid waste liquid generated during hydrolysis in advance not only helps to reduce environmental pollution, but also improves resource utilization rate and reduces production costs. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a hydrochloric acid recovery device for L-tyrosine production, which can recover and treat the remaining hydrochloric acid during the hydrolysis stage in the preparation of L-tyrosine, aiming at the deficiencies of the prior art.

[0005] The technical problem to be solved by the utility model is realized through the following technical solutions. A hydrochloric acid recovery device for L-tyrosine production includes a hydrolysis unit, an extraction unit, a distillation unit, and an evaporation unit.

[0006] The hydrolysis unit includes a hydrolysis kettle for hydrolyzing animal hair to form an amino acid hydrolysis solution for extracting L-tyrosine.

[0007] The described extraction unit includes an extraction tank, which is arranged in the later stage of the hydrolysis kettle. A connecting swivel pipe is arranged between the hydrolysis kettle and the extraction tank. The connecting swivel pipe includes a hydraulic lifter. The bottom of the hydraulic lifter contacts the ground and is set as a fixed end, and the top is set as a lifting end. A connecting column is fixedly arranged on the lifting end of the hydraulic lifter. An inlet pipe and an outlet pipe are fixedly arranged on the top of the connecting column. One end of the inlet pipe is connected to the exhaust gas port on the kettle cover of the hydrolysis kettle, and the outer peripheral surface of the other end is fixed on the top of the connecting column. One end of the connecting swivel pipe is connected to the inlet pipe on the connecting column and the other end is connected to the inlet of the extraction tank. There is an amino acid extraction liquid outlet and a hydrochloric acid extraction liquid outlet on the tank body of the extraction tank. The amino acid extraction liquid outlet is located above the hydrochloric acid extraction liquid outlet. A lifting pipe is connected between the outlet end of the hydrolysis kettle and the outlet pipe;

[0008] The described distillation unit includes a distillation tank arranged in the later stage of the extraction tank. The inlet of the distillation tank is connected to the amino acid extraction liquid outlet through a pipeline, and the ethanol extractant in the amino acid extraction liquid is evaporated and removed by the distillation tank;

[0009] The described evaporation unit includes a thin film evaporator arranged in the later stage of the extraction tank. The hydrochloric acid extraction liquid outlet is connected to the inlet pipe on the thin film evaporator, and the hydrochloric acid extraction liquid is heated by the thin film evaporator to concentrate the hydrochloric acid in the hydrochloric acid extraction liquid.

[0010] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the above-mentioned hydrochloric acid recovery device for L-tyrosine production, the inlet pipe includes an inclined part and horizontal and vertical parts arranged at both ends of the inclined part. The bottom flange of the horizontal part of the inlet pipe is connected to the exhaust gas port on the kettle cover of the hydrolysis kettle, and the outer wall of the vertical part of the inlet pipe is vertically fixed on the top surface of the connecting column.

[0011] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the above-mentioned hydrochloric acid recovery device for L-tyrosine production, a flow meter is installed on the outer peripheral surface of the horizontal part of the inlet pipe.

[0012] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the above-mentioned hydrochloric acid recovery device for L-tyrosine production, a pump I is installed on the pipeline between the extraction tank and the distillation tank and the thin film evaporator, and a pump II is installed on the lifting pipe.

[0013] The technical problem to be solved by the present utility model can also be achieved through the following technical solutions. For the above-mentioned hydrochloric acid recovery device for L-tyrosine production, a pressure gauge is provided on the kettle cover of the hydrolysis kettle.

[0014] Compared with the prior art, the beneficial technical effects of the present utility model are as follows: By connecting the loading arm and the lifting pipe thereon, the acid-containing tail gas and acid-containing hydrolysis liquid of the hydrolysis kettle can be recovered. The amino acid liquid and hydrochloric acid liquid in the acid-containing tail gas and acid-containing hydrolysis liquid are extracted and layered by the extraction tank, and the amino acid liquid and hydrochloric acid liquid are evaporated and concentrated by the distillation unit and the evaporation unit. On the one hand, the difficulty of subsequent purification of the amino acid liquid is reduced, and on the other hand, the pollution problem caused by the direct discharge of the acid-containing tail gas in the hydrolysis kettle is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view structural schematic diagram of the present utility model.

[0016] Reference numerals:

[0017] 1, hydrolysis kettle; 2, extraction tank; 3, hydraulic lifter; 4, connecting column; 5, loading arm; 6, unloading arm; 7, lifting pipe; 8, pump II; 9, pump I; 10, distillation tank; 11, thin film evaporator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the specific technical solutions of the present utility model with reference to the drawings, so as to facilitate those skilled in the art to further understand the present utility model without restricting its rights.

[0019] Example 1, referring to Figure 1 , a hydrochloric acid recovery device for L-tyrosine production, the device includes a hydrolysis unit, an extraction unit, a distillation unit and an evaporation unit;

[0020] The hydrolysis unit includes a hydrolysis kettle 1 for hydrolyzing animal hair to form an amino acid hydrolysis liquid for extracting L-tyrosine. The hydrolysis kettle 1 includes a kettle cover and a kettle body, and the kettle cover of the hydrolysis kettle 1 is provided with a pressure gauge;

[0021] The extraction unit described above includes an extraction tank 2, which consists of a tank body and a tank cover. The extraction tank 2 is arranged in the later stage of the hydrolysis kettle 1. A connecting swivel pipe is provided between the hydrolysis kettle 1 and the extraction tank 2. The connecting swivel pipe includes a hydraulic lifter 3. The bottom of the hydraulic lifter 3 contacts the ground and is set as the fixed end, and the top is set as the lifting end. A connecting column 4 is fixedly provided on the lifting end of the hydraulic lifter 3. The connecting column 4 forms a roughly cylindrical structure. A feed swivel pipe 5 and a discharge swivel pipe 6 are fixedly provided on the top of the connecting column 4. One end of the feed swivel pipe 5 is connected to the exhaust gas port on the kettle cover of the hydrolysis kettle 1, and the outer peripheral surface of the other end is fixed on the top of the connecting column 4. One end of the connecting swivel pipe is connected to the feed swivel pipe 5 on the connecting column 4, and the other end is connected to the inlet of the extraction tank 2. The tank body of the extraction tank 2 has an amino acid extraction liquid outlet and a hydrochloric acid extraction liquid outlet. The amino acid extraction liquid outlet is located above the hydrochloric acid extraction liquid outlet. A lifting pipe 7 is connected between the outlet end of the hydrolysis kettle 1 and the discharge swivel pipe 6. A pump II 8 is installed on the lifting pipe 7. The lifting pipe 7 pumps the amino acid hydrolysis liquid at the outlet of the hydrolysis kettle 1 into the extraction tank 2 through the pump II 8 for extraction;

[0022] The feed swivel pipe 5 includes an inclined part and a horizontal part and a vertical part provided at both ends of the inclined part. The bottom flange of the horizontal part of the feed swivel pipe 5 is flange-connected to the exhaust gas port on the kettle cover of the hydrolysis kettle. The outer wall of the vertical part of the feed swivel pipe 5 is vertically fixed on the top surface of the connecting column 4. A flow meter is installed on the outer peripheral surface of the horizontal part of the feed swivel pipe 5. A pump I 9 is installed on the pipeline between the extraction tank 2 and the distillation tank and the thin film evaporator;

[0023] The distillation unit described above includes a distillation tank 10 arranged in the later stage of the extraction tank 2. The distillation tank 10 consists of a tank body and a tank cover. The inlet of the distillation tank 10 is connected to the amino acid extraction liquid outlet through a pipeline. The ethanol extractant in the amino acid extraction liquid is evaporated and removed by the distillation tank 10;

[0024] The evaporation unit described above includes a thin film evaporator 11 arranged in the later stage of the extraction tank 2. The hydrochloric acid extraction liquid outlet is connected to the inlet pipe on the thin film evaporator 11. The hydrochloric acid extraction liquid is heated by the thin film evaporator 11 to concentrate the hydrochloric acid in the hydrochloric acid extraction liquid.

[0025] The usage process of this hydrochloric acid recovery device for L-tyrosine production is as follows:

[0026] (1)Animal hair is put into the kettle body of the hydrolysis kettle 1 as raw material. At the same time, an appropriate amount of hydrolysis agent and catalyst hydrochloric acid are added, and the kettle cover is closed. Under heating conditions, the animal hair undergoes a hydrolysis reaction under the action of the hydrolysis agent to generate an amino acid hydrolysis solution containing L-tyrosine. During this process, the pressure gauge on the kettle cover is used to monitor the pressure in the kettle to ensure that the reaction proceeds within a safe range. The hydrochloric acid-containing waste gas generated during the hydrolysis process is discharged through the waste gas port on the kettle cover, enters the horizontal part of the feed crane pipe 5, and its flow rate is monitored by a flow meter. Then the waste gas is transported to the extraction tank 2 through the connecting crane pipe;

[0027] (2)After the hydrolysis is completed, the amino acid hydrolysis solution at the outlet of the hydrolysis kettle 1 is pumped into the extraction tank 2 through the lifting pipe 7 under the action of the pump II 8. In the extraction tank 2, the amino acid hydrolysis solution is fully mixed with the ethanol extractant. Through the extraction effect, amino acids such as L-tyrosine are separated from the hydrolysis solution to form an amino acid extract and a hydrochloric acid extract. The amino acid extract is located in the upper layer due to its lower density and is discharged through the amino acid extract outlet. The hydrochloric acid extract is located in the lower layer and is discharged through the hydrochloric acid extract outlet. The pump I 9 is installed on the pipeline between the extraction tank 2, the distillation tank 10 and the thin film evaporator 11, and is used to transport the extracted amino acid extract and hydrochloric acid extract to the subsequent distillation tank 10 or thin film evaporator 11 respectively;

[0028] (3)After the amino acid extract enters the distillation tank 10, low-boiling extractants such as ethanol are evaporated by heating, and the steam is condensed and recycled. During the distillation process, amino acids such as L-tyrosine remain in the distillation tank 10 due to their higher boiling points, realizing the recovery of the extractant and the preliminary purification of the amino acids;

[0029] (4)After the hydrochloric acid extract enters the thin film evaporator 11, water is evaporated by heating, and the concentration of hydrochloric acid gradually increases. The high-efficiency heat exchange performance of the thin film evaporator 11 ensures the rapid progress of the evaporation process and at the same time avoids the excessive decomposition of hydrochloric acid. The concentrated hydrochloric acid is discharged through the outlet and can be used for subsequent production or sold as a by-product.

Claims

1. A hydrochloric acid recovery device for L-tyrosine production, characterized in that: The device includes a hydrolysis unit, an extraction unit, a distillation unit and an evaporation unit; The hydrolysis unit includes a hydrolysis kettle for hydrolyzing animal hair to form an amino acid hydrolysis solution for extracting L-tyrosine; The extraction unit includes an extraction tank. The extraction tank is arranged in the later stage of the hydrolysis kettle. A connecting swan neck is arranged between the hydrolysis kettle and the extraction tank. The connecting swan neck includes a hydraulic lifter. The bottom of the hydraulic lifter contacts the ground and is set as a fixed end, and the top is set as a lifting end. A connecting column is fixedly arranged on the lifting end of the hydraulic lifter. An inlet swan neck and an outlet swan neck are fixedly arranged on the top of the connecting column. One end of the inlet swan neck is connected to the exhaust gas port on the kettle cover of the hydrolysis kettle, and the outer peripheral surface of the other end is fixed on the top of the connecting column. One end of the connecting swan neck is connected to the inlet swan neck on the connecting column and the other end is connected to the inlet of the extraction tank. There is an amino acid extraction liquid outlet and a hydrochloric acid extraction liquid outlet on the tank body of the extraction tank. The amino acid extraction liquid outlet is located above the hydrochloric acid extraction liquid outlet. A lifting pipe is connected between the outlet end of the hydrolysis kettle and the outlet swan neck; The distillation unit includes a distillation tank arranged in the later stage of the extraction tank. The inlet of the distillation tank is connected to the amino acid extraction liquid outlet through a pipeline. The distillation tank evaporates and removes the ethanol extraction agent in the amino acid extraction liquid; The evaporation unit includes a thin film evaporator arranged in the later stage of the extraction tank. The hydrochloric acid extraction liquid outlet is connected to the inlet pipe on the thin film evaporator. The thin film evaporator heats the hydrochloric acid extraction liquid to concentrate the hydrochloric acid in the hydrochloric acid extraction liquid.

2. The hydrochloric acid recovery device for L-tyrosine production according to claim 1, characterized in that: The inlet swan neck includes an inclined part and a horizontal part and a vertical part arranged at both ends of the inclined part. The bottom flange of the horizontal part of the inlet swan neck is connected to the exhaust gas port on the kettle cover of the hydrolysis kettle, and the outer wall of the vertical part of the inlet swan neck is vertically fixed on the top surface of the connecting column.

3. The hydrochloric acid recovery device for L-tyrosine production according to claim 1, wherein: A flow meter is installed on the outer peripheral surface of the horizontal part of the inlet swan neck.

4. The hydrochloric acid recovery device for L-tyrosine production according to claim 1, characterized in that: A pump I is installed on the pipeline between the extraction tank and the distillation tank and the thin film evaporator, and a pump II is installed on the lifting pipe.

5. The hydrochloric acid recovery device for L-tyrosine production according to claim 1, characterized in that: A pressure gauge is provided on the kettle cover of the hydrolysis kettle.

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