Methionine crystallization separation system

Abstract

The utility model provides a methionine crystallization separation system, and relates to the technical field of chemical raw material production, the methionine crystallization separation system comprises a segmented evaporation assembly and a heat exchange circulation assembly, a material enters an array heat exchanger through a stock solution inlet pipe, the material is preheated, the temperature of the material before the material enters a crystallizer is appropriate, the performance of a final product is improved, and the production efficiency is improved. After the material passes through the crystallizer, the material becomes an aqueous solution containing methionine crystals, and the aqueous solution enters the distillation tower body through a solvent liquid inlet pipe and is distilled in four sections of a first distillation section, a second distillation section, a third distillation section and a fourth distillation section in sequence to obtain a methionine finished product; according to the device, the quality of a product is improved, the solvent which is not completely separated can enter the stock solution inlet pipe again to be repeatedly separated, and the yield of the product is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical raw material production, and in particular to a methionine crystallization and separation system. Background Art

[0002] Methionine is a non-polar α-amino acid widely used in the feed and pharmaceutical industries. The Hein process is currently the most commonly used method for producing methionine. This involves first preparing a methionine-containing solution, which is then crystallized to produce solid methionine. The industry currently uses a staged evaporation method to extract methionine from methionine solutions. The methionine-containing solution first enters the first evaporation section, where it evaporates at a high temperature (approximately 130-150°C). During the evaporation process, water and other impurities in the solution are released into the air along with the gases. The resulting high-concentration methionine solution then flows through a pipeline into the next evaporation section, where it continues evaporating at a lower temperature. This cycle continues until the methionine product is concentrated.

[0003] However, in the prior art, a four-stage method is used for distillation, but four distillation towers are required for distributed distillation, resulting in high production costs and complex processes. In addition, simply performing four-stage distillation results in low methionine purity and large product defects, thus presenting deficiencies. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a methionine crystallization separation system, which can make the stock solution treatment more thorough, improve the purity of the product, reduce the production cost, and simplify the process.

[0005] This application is implemented as follows:

[0006] a segmented evaporation assembly, the segmented evaporation assembly comprising a distillation tower body, the distillation tower body being divided into four sections: a first distillation section, a second distillation section, a third distillation section, and a fourth distillation section. The methionine aqueous solution flows sequentially to the four sections through a liquid infusion pipe. The distillation tower body is used to separate the methionine aqueous solution into methionine;

[0007] A heat exchange circulation component, which includes a raw liquid inlet pipe, an array heat exchanger, a crystallizer and a solvent inlet pipe. One end of the raw liquid inlet pipe is fixedly connected to one end of the array heat exchanger. The array heat exchanger and the crystallizer are connected to each other. The crystallizer is fixedly connected to the bottom of the first distillation section through the solvent inlet pipe.

[0008] In one embodiment of the present application, the first distillation section includes a first distillation chamber, a serpentine heat exchange tube, a resistance heat plate and a first infusion pipe, the serpentine heat exchange tube is arranged in the first distillation chamber, the resistance heat plate is fixedly connected in the first distillation chamber, one end of the first infusion pipe is fixedly connected in the first distillation chamber, and the other end of the first infusion pipe is fixedly connected in the second distillation section.

[0009] In one embodiment of the present application, the outer end of the serpentine heat exchange tube is fixedly connected to the heat exchanger body.

[0010] In one embodiment of the present application, the second distillation section includes a second distillation chamber and a second infusion pipe, the serpentine heat exchange pipe is arranged in the second distillation chamber, the resistance heat plate is fixedly connected in the second distillation chamber, one end of the second infusion pipe is fixedly connected in the second distillation chamber, and the other end of the second infusion pipe is fixedly connected in the third distillation section.

[0011] In one embodiment of the present application, the third distillation section includes a third distillation chamber and a third infusion pipe, the serpentine heat exchange tube is arranged in the third distillation chamber, the resistance heat plate is fixedly connected in the third distillation chamber, one end of the third infusion pipe is fixedly connected in the third distillation chamber, and the other end of the third infusion pipe is fixedly connected in the fourth distillation section.

[0012] In one embodiment of the present application, the fourth distillation section includes a fourth distillation chamber and a reflux infusion pipe, the serpentine heat exchange pipe is arranged in the fourth distillation chamber, the resistance heating plate is fixedly connected in the fourth distillation chamber, one end of the reflux infusion pipe is fixedly connected in the fourth distillation chamber, and the other end of the reflux infusion pipe is fixedly connected in the raw liquid inlet pipe.

[0013] In one embodiment of the present application, double-layer insulation boards are fixedly connected between the first distillation section, the second distillation section, the third distillation section, and the fourth distillation section.

[0014] In one embodiment of the present application, each section of the first distillation section, the second distillation section, the third distillation section, and the fourth distillation section is fixedly connected to an exhaust pipe.

[0015] In one embodiment of the present application, the bottom of the fourth distillation section is fixedly connected to an output pipe.

[0016] The beneficial effects of the present application are as follows: the material enters the array heat exchanger through the raw liquid inlet pipe, and the material is preheated to make the material temperature suitable before entering the crystallizer, thereby improving the performance of the final product. After the material passes through the crystallizer, the material becomes an aqueous solution containing methionine crystals. The aqueous solution enters the distillation tower through the solvent inlet pipe, and is sequentially distilled in four sections, namely the first distillation section, the second distillation section, the third distillation section, and the fourth distillation section, to obtain a methionine product. The completely distilled aqueous solvent flows back to the raw liquid inlet pipe through the fourth distillation section for re-distillation and separation. The present device improves the quality of the product by concentrating the four distillation sections in one tower body and pre-raising the material temperature before entering the distillation. In addition, the incompletely separated solvent can be re-entered into the raw liquid inlet pipe for repeated separation, further increasing the product yield. This solves the problems of high production cost and complex process when separating methionine substances in the prior art, and the problem that simply performing four-stage distillation results in low methionine purity and large product defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a methionine crystallization and separation system is provided for an embodiment of the present application;

[0019] Figure 2 A side schematic diagram of a methionine crystallization and separation system is provided for an embodiment of the present application;

[0020] Figure 3 A side schematic diagram of a distillation tower is provided for an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a heat exchanger body is provided for the embodiment of the present application;

[0022] In the figure: 100 - segmented evaporation assembly; 110 - distillation tower body; 120 - first distillation section; 121 - first distillation chamber; 122 - serpentine heat exchange tube; 123 - resistance heating plate; 124 - first liquid infusion pipe; 125 - heat exchanger body; 130 - second distillation section; 131 - second distillation chamber; 132 - second liquid infusion pipe; 140 - third distillation section; 141 - third distillation chamber; 142 - third liquid infusion pipe; 150 - fourth distillation section; 151 - fourth distillation chamber; 152 - reflux liquid infusion pipe; 160 - double-layer insulation board; 170 - exhaust pipe; 180 - output pipe; 200 - heat exchange circulation assembly; 210 - raw liquid inlet pipe; 220 - array heat exchanger; 230 - crystallizer; 240 - solvent inlet pipe; DETAILED DESCRIPTION

[0023] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0024] like Figures 1-4 As shown, a methionine crystallization and separation system according to an embodiment of the present application includes:

[0025] The segmented evaporation assembly 100 includes a distillation tower 110. The distillation tower 110 is divided into four sections: a first distillation section 120, a second distillation section 130, a third distillation section 140, and a fourth distillation section 150. The methionine aqueous solution flows sequentially to the four sections through a liquid infusion pipe. The distillation tower 110 is used to separate the methionine aqueous solution into methionine.

[0026] The heat exchange circulation component 200 includes a raw liquid inlet pipe 210, an array heat exchanger 220, a crystallizer 230 and a solvent inlet pipe 240. One end of the raw liquid inlet pipe 210 is fixedly connected to one end of the array heat exchanger 220. The array heat exchanger 220 and the crystallizer 230 are connected to each other. The crystallizer 230 is fixedly connected to the bottom of the first distillation section 120 through the solvent inlet pipe 240. The material enters the array heat exchanger 220 through the raw liquid inlet pipe 210, where it is preheated to a suitable temperature before entering the crystallizer 230, thereby improving the performance of the final product. After passing through the crystallizer 230, the material becomes an aqueous solution containing methionine crystals. The aqueous solution enters the distillation column 110 through the solvent inlet pipe 240, where it is sequentially distilled in the first distillation section 120, the second distillation section 130, the third distillation section 140, and the fourth distillation section 150 to obtain the finished methionine product. The completely distilled aqueous solvent flows back to the raw liquid inlet pipe 210 through the fourth distillation section 150 for redistillation and separation. By consolidating the four distillation sections within a single column and pre-elevating the material temperature before entering the distillation process, the present device improves product quality. Furthermore, any incompletely separated solvent can be re-entered into the raw liquid inlet pipe 210 for repeated separation, further increasing product yield. This device solves the problems of high production costs and complex processes in the prior art for separating methionine substances, as well as the low purity and high product defects caused by simply performing four distillation stages.

[0027] like Figure 3 As shown, the first distillation section 120 includes a first distillation chamber 121, a coil-type heat exchange tube 122, a resistance heating plate 123, and a first liquid infusion pipe 124. The coil-type heat exchange tube 122 is disposed within the first distillation chamber 121, the resistance heating plate 123 is fixedly connected to the first distillation chamber 121, and one end of the first liquid infusion pipe 124 is fixedly connected to the first distillation chamber 121, while the other end of the first liquid infusion pipe 124 is fixedly connected to the second distillation section 130. The resistance heating plate 123 and the coil-type heat exchange tube 122 maintain the temperature within each distillation chamber, ensuring distillation quality.

[0028] like Figure 3 As shown, the outer end of the serpentine heat exchange tube 122 is fixedly connected to the heat exchanger body 125. The heat exchanger body 125 is used to circulate the heat exchange solvent of the serpentine heat exchange tube 122 continuously, thereby maintaining the heat exchange efficiency of the serpentine heat exchange tube 122 and ensuring that the temperature in each distillation chamber is appropriate.

[0029] like Figure 3As shown, the second distillation section 130 includes a second distillation chamber 131 and a second liquid infusion pipe 132. The coil-and-screw heat exchange tube 122 is disposed within the second distillation chamber 131. The resistive heating plate 123 is fixedly connected to the second distillation chamber 131. One end of the second liquid infusion pipe 132 is fixedly connected to the second distillation chamber 131, and the other end of the second liquid infusion pipe 132 is fixedly connected to the third distillation section 140. After distillation is completed in the first distillation chamber 121, the aqueous solvent is transported to the second distillation chamber 131 via the first liquid infusion pipe 124.

[0030] like Figure 3 As shown, the third distillation section 140 includes a third distillation chamber 141 and a third liquid infusion pipe 142. The coil-and-spool heat exchange tube 122 is disposed within the third distillation chamber 141. The resistive heating plate 123 is fixedly connected to the third distillation chamber 141. One end of the third liquid infusion pipe 142 is fixedly connected to the third distillation chamber 141, and the other end of the third liquid infusion pipe 142 is fixedly connected to the fourth distillation section 150. After distillation is completed in the second distillation chamber 131, the aqueous solvent is transported to the third distillation chamber 141 via the second liquid infusion pipe 132.

[0031] like Figure 3 As shown, the fourth distillation section 150 includes a fourth distillation chamber 151 and a reflux infusion pipe 152. The coil-and-screw heat exchange tube 122 is disposed within the fourth distillation chamber 151, and the resistive heating plate 123 is fixedly connected to the fourth distillation chamber 151. One end of the reflux infusion pipe 152 is fixedly connected to the fourth distillation chamber 151, while the other end of the reflux infusion pipe 152 is fixedly connected to the raw liquid inlet pipe 210. After distillation is completed in the third distillation chamber 141, the aqueous solvent is transported to the fourth distillation chamber 151 via the third infusion pipe 142. The undistilled aqueous solvent returns to the raw liquid inlet pipe 210 via the reflux infusion pipe 152.

[0032] like Figure 2 As shown, double-layer insulation boards 160 are fixedly connected between the first distillation section 120, the second distillation section 130, the third distillation section 140 and the fourth distillation section 150. The double-layer insulation boards 170 are used to isolate each distillation section to ensure that the temperature of each distillation section is different.

[0033] like Figure 2 As shown, each section of the first distillation section 120, the second distillation section 130, the third distillation section 140 and the fourth distillation section 150 is fixedly connected to an exhaust pipe 170. The exhaust pipe 170 is used to discharge impurities such as water vapor generated during the distillation process.

[0034] like Figure 2 As shown, the bottom of the fourth distillation section 150 is fixedly connected to an output pipe 180. The output pipe 180 is used to output the methionine substance.

[0035] In summary, the working principle of the methionine crystallization and separation system of the embodiment of the present invention is as follows: the material enters the array heat exchanger 220 through the raw liquid inlet pipe 210, and the material is preheated to make the temperature of the material suitable before entering the crystallizer 230, thereby improving the performance of the final product. After the material passes through the crystallizer 230, the material becomes an aqueous solution containing methionine crystals. The aqueous solution enters the distillation tower body 110 through the solvent inlet pipe 240, and the four sections of the first distillation chamber 121, the second distillation chamber 131, the third distillation chamber 141 and the fourth distillation chamber 151 are respectively connected through the first infusion pipe 124, the second infusion pipe 132. and the third infusion pipe 142 are distilled in sequence to obtain the methionine product, and the completely distilled water solvent is refluxed to the raw liquid inlet pipe 210 through the reflux infusion pipe 152 for redistillation and separation. The device improves the quality of the product by concentrating the four distillation sections in one tower body and pre-raising the material temperature before entering the distillation. The incompletely separated solvent can be re-entered into the raw liquid inlet pipe 210 for repeated separation, further improving the product yield, solving the problems of high production cost and complex process when separating methionine substances in the prior art, and the problem that simply performing four-stage distillation leads to low methionine purity and large product defects.

[0036] The above are merely examples of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included within the scope of protection of the present application. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A methionine crystallization and separation system, characterized in that: include: A segmented evaporation assembly (100) comprising a distillation tower body (110), wherein the distillation tower body (110) is divided into four sections, namely a first distillation section (120), a second distillation section (130), a third distillation section (140), and a fourth distillation section (150); a methionine aqueous solution flows sequentially to the four sections through a liquid infusion pipe; and the distillation tower body (110) is used to separate the methionine aqueous solution into methionine; A heat exchange circulation component (200) includes a raw liquid inlet pipe (210), an array heat exchanger (220), a crystallizer (230) and a solvent inlet pipe (240), one end of the raw liquid inlet pipe (210) is fixedly connected to one end of the array heat exchanger (220), the array heat exchanger (220) and the crystallizer (230) are connected to each other, and the crystallizer (230) is fixedly connected to the bottom of the first distillation section (120) through the solvent inlet pipe (240).

2. A methionine crystallization and separation system according to claim 1, characterized in that: The first distillation section (120) includes a first distillation chamber (121), a serpentine heat exchange tube (122), a resistance heat plate (123) and a first liquid infusion pipe (124); the serpentine heat exchange tube (122) is arranged in the first distillation chamber (121); the resistance heat plate (123) is fixedly connected to the first distillation chamber (121); one end of the first liquid infusion pipe (124) is fixedly connected to the first distillation chamber (121); and the other end of the first liquid infusion pipe (124) is fixedly connected to the second distillation section (130).

3. A methionine crystallization and separation system according to claim 2, characterized in that: The outer end of the serpentine heat exchange tube (122) is fixedly connected to the heat exchanger body (125).

4. A methionine crystallization and separation system according to claim 2, characterized in that: The second distillation section (130) includes a second distillation chamber (131) and a second liquid infusion pipe (132), the serpentine heat exchange pipe (122) is arranged in the second distillation chamber (131), the resistance heat plate (123) is fixedly connected in the second distillation chamber (131), one end of the second liquid infusion pipe (132) is fixedly connected in the second distillation chamber (131), and the other end of the second liquid infusion pipe (132) is fixedly connected in the third distillation section (140).

5. A methionine crystallization and separation system according to claim 2, characterized in that: The third distillation section (140) includes a third distillation chamber (141) and a third liquid infusion pipe (142); the serpentine heat exchange pipe (122) is arranged in the third distillation chamber (141); the resistance heat plate (123) is fixedly connected to the third distillation chamber (141); one end of the third liquid infusion pipe (142) is fixedly connected to the third distillation chamber (141); and the other end of the third liquid infusion pipe (142) is fixedly connected to the fourth distillation section (150).

6. A methionine crystallization and separation system according to claim 2, characterized in that: The fourth distillation section (150) includes a fourth distillation chamber (151) and a reflux infusion pipe (152), the serpentine heat exchange pipe (122) is arranged in the fourth distillation chamber (151), the resistance heat plate (123) is fixedly connected to the fourth distillation chamber (151), one end of the reflux infusion pipe (152) is fixedly connected to the fourth distillation chamber (151), and the other end of the reflux infusion pipe (152) is fixedly connected to the raw liquid inlet pipe (210).

7. The methionine crystallization and separation system according to claim 1, characterized in that: A double-layer heat insulation board (160) is fixedly connected between the first distillation section (120), the second distillation section (130), the third distillation section (140) and the fourth distillation section (150).

8. The methionine crystallization and separation system according to claim 1, characterized in that: Each section of the first distillation section (120), the second distillation section (130), the third distillation section (140) and the fourth distillation section (150) is fixedly connected to an exhaust pipe (170).

9. The methionine crystallization and separation system according to claim 1, characterized in that: The bottom of the fourth distillation section (150) is fixedly connected to an output pipe (180).

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