Esterification tower for producing and processing methyl lactate

Abstract

The utility model discloses an esterification tower for producing and processing methyl lactate, and relates to the technical field of methyl lactate production. The esterification tower comprises an esterification tower shell, a circulating pump, a heating sleeve and a transparent liquid separation tank, an inner heat preservation shell is fixed on the inner wall of the esterification tower shell, a reaction cavity is fixed on the inner wall of the inner heat preservation shell, the heating sleeve is fixed on the lower portion of the inner wall of the reaction cavity, and the circulating pump is fixed in the center of the bottom end of the esterification tower shell. A transparent liquid separation tank is arranged on one side of the esterification tower shell, a return pipe is fixedly communicated with the center of the bottom end of the transparent liquid separation tank, a second solvent pipe is fixedly communicated with the bottom end of the transparent liquid separation tank on one side of the return pipe, and a first solvent pipe is fixedly communicated with the top end of the transparent liquid separation tank. Through the arrangement of the esterification tower shell, the circulating pump, the heating jacket and the transparent liquid separation tank, the problems that the material heating rate is not high enough and the yield of produced methyl lactate is low when the methyl lactate esterification tower operates are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methyl lactate production, in particular to an esterification tower for the production and processing of methyl lactate. Background Art

[0002] The chemical formula of methyl lactate is C4H8O3. It is a colorless transparent liquid with a special smell and sweet taste. It is easily soluble in water, ethanol and most organic solvents, and is often used as a solvent for cellulose, paint, and dyes. The molecular weight of methyl lactate is 104.10, the boiling point is about 145.3°C, and the flash point is about 49°C. In terms of safety, methyl lactate is flammable, and its vapor may irritate the eyes and respiratory system. When handling methyl lactate, appropriate safety measures should be taken, including wearing protective clothing and protective glasses to prevent skin contact and eye contact. The methyl lactate esterification tower is a chemical equipment used to produce methyl lactate. Methyl lactate is an important organic chemical raw material, widely used in food additives, cosmetics, pharmaceuticals, and biodegradable plastics. The design and operation of the esterification tower is crucial to improving the yield and purity of methyl lactate, but it still has the following disadvantages in actual use:

[0003] During the operation of the methyl lactate esterification tower, the raw materials and catalyst for methyl lactate production need to be fully mixed, heated to a suitable temperature, and esterified to generate methyl lactate. During the production process, the reaction raw materials need to be evenly mixed in the esterification tower, but continuous stirring is required during the mixing process, and vortices are easily generated during stirring. The up and down convection speed of the liquid in the vortex is not high enough, and the material heating speed is not high enough;

[0004] The methyl lactate produced by the methyl lactate esterification tower is subjected to distillation, extraction, and rectification to obtain methyl lactate with higher purity. However, during the processing, the reacted materials are directly output for distillation, and there are still a large amount of unreacted materials in the mixed materials. In addition, during the cooling process, the methyl lactate produced by the reaction moves towards the decomposition direction due to the lowering of temperature, and the chemical equilibrium moves towards the decomposition direction, resulting in the production of methyl lactate The yield rate is not high enough. Utility Model Content

[0005] The utility model aims to provide an esterification tower for the production and processing of methyl lactate. By arranging an esterification tower shell, a circulation pump, a heating jacket and a transparent liquid separation tank, the utility model solves the problem that the material heating rate is not high enough and the yield of methyl lactate produced is low when the esterification tower of methyl lactate is running.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0007] The utility model discloses an esterification tower for producing and processing methyl lactate, comprising an esterification tower shell, a circulation pump, a heating jacket and a transparent liquid separation tank. An inner insulation shell is fixed on the inner wall of the esterification tower shell, a reaction chamber is fixed on the inner wall of the inner insulation shell, a heating jacket is fixed on the lower part of the inner wall of the reaction chamber, a circulation pump is fixed on the center of the bottom end of the esterification tower shell, a transparent liquid separation tank is arranged on one side of the esterification tower shell, a reflux pipe is fixedly connected to the center of the bottom end of the transparent liquid separation tank, a solvent pipe 2 is fixedly passed through the bottom end of the transparent liquid separation tank on one side of the reflux pipe, and a solvent pipe 1 is fixedly connected to the top end of the transparent liquid separation tank. When working, the inner insulation shell is fixed therein through the esterification tower shell, and the reaction chamber is fixed therein through the inner insulation shell. The circulating pump works to make the reactants in the esterification tower shell circulate, the reaction materials in the reaction chamber are heated through the heating jacket, and the methyl lactate produced by the reaction is extracted and outputted in the reaction process in the reaction chamber through the transparent liquid separation tank, so as to increase the yield rate of the methyl lactate produced finally.

[0008] Furthermore, the top of the reaction chamber is fixedly connected with a feed pipe, which is fixed through the top of the esterification tower outer shell and the inner insulation shell, and the reaction raw materials and catalyst are input into the reaction chamber through the feed pipe.

[0009] Furthermore, the input and output ends of the circulation pump are fixedly connected to a circulation box, a connecting pipe is fixed at the top center of each circulation box, two connecting pipes are fixed through the outer shell of the esterification tower and the bottom end of the inner insulation shell, the top ends of the two connecting pipes are fixedly connected to the bottom end of the reaction chamber, and a liquid outlet pipe is fixedly connected to the bottom center of the circulation box away from the transparent liquid separation tank. When the circulation pump is working, the reaction materials are circulated and transported through the circulation box and the connecting pipe.

[0010] Furthermore, the tops of the two circulation boxes are fixed to the bottom end of the esterification tower shell, and a heating plate is fixed in the heating jacket, and the heating jacket heats the material in the reaction chamber through the heating plate.

[0011] Furthermore, an input pipe is fixedly connected to the lower part of the peripheral side of the transparent liquid separation tank. The input pipe is fixed in the outer shell of the esterification tower and the inner insulation shell and is connected to the reaction chamber. A switch valve is fixed on the peripheral side of the input pipe, and the reaction materials in the reaction chamber are transported to the transparent liquid separation tank through the input pipe.

[0012] Furthermore, a reflux pipe is fixedly connected to the center of the bottom end of the transparent liquid separating tank, and one end of the reflux pipe away from the transparent liquid separating tank is fixed on the circulation box at the input end of the circulation pump and is connected to the circulation box. Control valves are fixed on the solvent tube 2 below the transparent liquid separating tank and the surrounding side of the reflux pipe. The transparent liquid separating tank refluxes the extracted reaction materials into the reaction chamber through the reflux pipe.

[0013] The utility model has the following beneficial effects:

[0014] The utility model solves the problem that the material heating rate is not high enough when the methyl lactate esterification tower is running by arranging an esterification tower shell, a circulation pump and a heating jacket. The circulation pump and the heating plate are started, and the circulation pump extracts the reaction raw materials in the circulation box close to the transparent liquid separation tank, outputs them to the circulation box far away from the transparent liquid separation tank, and then sprays them into the reaction chamber through the connecting pipe on the top of the circulation box, enters the outside of the heating jacket in the reaction chamber, and then circulates outside the heating jacket and is transported to the connecting pipe close to the transparent liquid separation tank, flows through the connecting pipe to the circulation box at the bottom thereof, and performs cyclic heating, so that all the reaction raw materials and catalysts are quickly heated to a suitable reaction temperature, the heating of the materials to the reaction temperature is accelerated, and the temperature of the reaction materials is more uniform.

[0015] The utility model solves the problem of low yield of methyl lactate produced by methyl lactate esterification tower by arranging an esterification tower shell, a circulation pump and a transparent liquid separation tank. The solvent for extracting methyl lactate is transported to the transparent liquid separation tank through a solvent pipe one, and it is ensured that the liquid level of the extraction solvent is above the top end of a solvent pipe two. Through the flow of the reaction mixture in the transparent liquid separation tank, methyl lactate produced by the reaction in the reaction mixture is extracted into the extraction solvent. After the extraction for more than half an hour, the control valve is opened, and the extracted solvent is transported to the distillation equipment through the solvent pipe two. After the liquid level on the extraction solvent is flush with the top end of the solvent pipe two, the control valve on the solvent pipe two is closed, and the extraction solvent is transported to the transparent liquid separation tank through the solvent pipe one. The methyl lactate produced by the cyclic extraction reaction is made so that in the reversible process of the esterification reaction in the reaction chamber, the reaction moves in the direction of producing more products, the reactants react more fully, and the yield of methyl lactate is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a partial cross-sectional structural perspective diagram of an esterification tower for the production and processing of methyl lactate;

[0018] Figure 2 It is a sectional structural stereogram of the esterification tower shell;

[0019] Figure 3 It is a three-dimensional diagram of the circulation pump structure;

[0020] Figure 4 It is a three-dimensional diagram of the cross-sectional structure of the heating jacket;

[0021] Figure 5It is a partially cutaway structural stereogram of a transparent liquid separation tank;

[0022] Figure 6 This is a three-dimensional diagram of the complete structure of an esterification tower used in the production and processing of methyl lactate.

[0023] Reference numerals:

[0024] 1. Esterification tower shell; 101. Inner insulation shell; 102. Reaction chamber; 103. Feed pipe; 2. Circulation pump; 201. Circulation box; 202. Connecting pipe; 203. Liquid outlet pipe; 3. Heating jacket; 301. Heating plate; 4. Transparent liquid separation tank; 401. Input pipe; 402. Switch valve; 403. Solvent pipe 1; 404. Solvent pipe 2; 405. Reflux pipe; 406. Control valve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Specific embodiment 1

[0026] See also Figure 1-6The utility model is an esterification tower for the production and processing of methyl lactate, comprising an esterification tower shell 1, a circulation pump 2, a heating jacket 3 and a transparent liquid separation tank 4. An inner insulation shell 101 is fixed on the inner wall of the esterification tower shell 1, and a reaction chamber 102 is fixed on the inner wall of the inner insulation shell 101. The esterification tower shell 1 fixes the inner insulation shell 101 therein, and the reaction chamber 102 is fixed therein through the inner insulation shell 101. The raw materials and catalysts for the production of methyl lactate are contained in the reaction chamber 102 for reaction. A heating jacket 3 is fixed on the lower part of the inner wall of the reaction chamber 102, and a heating plate 301 is fixed therein through the heating jacket 3. A circulation pump 2 is fixed at the bottom center of the esterification tower shell 1, and the raw materials for the production of methyl lactate in the reaction chamber 102 are circulated through the circulation pump 2. A transparent liquid separation tank 4 is provided on one side of the esterification tower shell 1, and the transparent liquid separation tank 4 is used to separate the solvent during the methyl lactate reaction. The esterification tower shell 1 and the transparent liquid separation tank 4 are both fixed on an external bracket. A reflux pipe 405 is fixedly connected to the center of the bottom end of the transparent liquid separation tank 4, and the reactants circulating in the transparent liquid separation tank 4 are circulated to the circulation box 201 at the input end of the circulation pump 2 through the reflux pipe 405. A solvent pipe 2 404 is fixedly connected to the bottom end of the transparent liquid separation tank 4 on one side of the reflux pipe 405, and the methyl lactate solvent generated in the extraction production process in the transparent liquid separation tank 4 is output from the transparent liquid separation tank 4 through the solvent pipe 2 404. A solvent pipe 1 403 is fixedly connected to the top of the transparent liquid separation tank 4, and the extraction solvent is transported to the transparent liquid separation tank 4 through the solvent pipe 1 403.

[0027] Specifically, the top of the reaction chamber 102 is fixedly connected to a feed pipe 103, and the top of the feed pipe 103 is connected to a pipeline for transporting reaction raw materials and catalysts. The feed pipe 103 is fixed through the top of the esterification tower outer shell 1 and the inner insulation shell 101. The reaction chamber 102 transports the raw materials and catalyst for producing methyl lactate into the reaction chamber 102 through the feed pipe 103.

[0028] Furthermore, the input end and the output end of the circulation pump 2 are both fixedly connected to the circulation box 201, and a connecting pipe 202 is fixedly connected to the top center of each circulation box 201. The two connecting pipes 202 are fixed through the esterification tower shell 1 and the bottom end of the inner insulation shell 101. The top ends of the two connecting pipes 202 are fixedly connected to the bottom end of the reaction chamber 102. The bottom center of the circulation box 201 away from the transparent liquid separation tank 4 is fixedly connected to a liquid outlet pipe 203. The circulation pump 2 is connected to the esterification tower shell 1 and the inner insulation shell 101 through the circulation box 201. The connecting pipe 202 is connected, the circulation box 201 is connected to the reaction chamber 102 through the connecting pipe 202, the circulation box 201 connected to the liquid outlet pipe 203 is connected to the output end of the circulation pump 2, and the connecting piece at the bottom end of the liquid outlet pipe 203 is connected to the equipment for processing the reaction waste in the reaction chamber 102. When the reaction chamber 102 stops working, the equipment for processing the reaction waste in the reaction chamber 102 is started, and the reaction waste in the reaction chamber 102 is transported to the equipment for processing the reaction waste in the reaction chamber 102 through the liquid outlet pipe 203.

[0029] Furthermore, the tops of the two circulation boxes 201 are fixed to the bottom of the esterification tower shell 1 , and a heating plate 301 is fixed in the heating jacket 3 . The heating jacket 3 generates heat for heating the reaction materials in the reaction chamber 102 through the heating plate 301 .

[0030] The operation process of this embodiment is as follows: when working, the bottom joint of the liquid outlet pipe 203 at the bottom of the circulation box 201 is connected to the equipment for processing the waste after the reaction, and then the raw materials and catalysts for methyl lactate production are transported to the reaction chamber 102 through the feed pipe 103, the switch valve 402 and the control valve 406 are closed, the circulation pump 2 and the heating plate 301 are started, and the circulation pump 2 draws out the reaction raw materials in the circulation box 201 close to the transparent liquid separator tank 4, outputs them to the circulation box 201 far away from the transparent liquid separator tank 4, and then sprays them into the reaction chamber 102 through the connecting pipe 202 at the top of the circulation box 201, enters the outside of the heating jacket 3 in the reaction chamber 102, and then circulates outside the heating jacket 3 and is transported to the connecting pipe 202 close to the transparent liquid separator tank 4, flows through this connecting pipe 202 to the circulation box 201 at its bottom, and performs cyclic heating, so that all the reaction raw materials and catalysts are quickly heated to a suitable reaction temperature. Specific embodiment 2

[0031] See also Figure 1 , 2, 3, 5, 6, on the basis of the specific embodiment 1, the lower part of the peripheral side of the transparent liquid separating tank 4 is fixedly connected with an input pipe 401, the input pipe 401 is fixed through the esterification tower outer shell 1 and the inner insulation shell 101 and is connected with the reaction chamber 102, the peripheral side of the input pipe 401 is fixed with a switch valve 402, the transparent liquid separating tank 4 transports the reaction raw materials in the reaction chamber 102 to the transparent liquid separating tank 4 through the input pipe 401, and the input pipe 401 is controlled by the switch valve 402 to switch on and off the transport of the input pipe 401.

[0032] Specifically, a reflux pipe 405 is fixedly connected to the center of the bottom end of the transparent liquid separating tank 4, and one end of the reflux pipe 405 away from the transparent liquid separating tank 4 is fixed on the circulation box 201 at the input end of the circulation pump 2 and is connected to the circulation box 201. The solvent tube 2 404 below the transparent liquid separating tank 4 and the reflux pipe 405 are fixed with a control valve 406. The liquid entering the transparent liquid separating tank 4 flows back to the circulation box 201 at the input end of the circulation pump 2 through the reflux pipe 405, and finally flows back to the reaction chamber 102.

[0033] The operation process of this embodiment is as follows: during operation, when the raw materials in the reaction chamber 102 are heated to the point where the reaction begins, the connector at the bottom of the solvent tube 404 is connected to the equipment for distilling methyl lactate, and the switch valve 402 and the control valve 406 on the sides of the input tube 401 and the reflux tube 405 are opened, so that the reacted materials in the reaction chamber 102 are transported to the transparent liquid separation tank 4, and are transported to the circulation box 201 at the input end of the circulation pump 2 through the reflux tube 405 for circulation, and the flow rate is controlled by the control valve 406 on the reflux tube 405 to maintain the liquid level in the transparent liquid separation tank 4 always below the top of the solvent tube 404, and the solvent for extracting methyl lactate is transported to the transparent liquid separation tank 4 through the solvent tube 1 403, and the liquid level of the extraction solvent is ensured. Located above the top of the solvent tube 2 404, the methyl lactate produced in the reaction mixture is extracted into the extraction solvent through the flow of the reaction mixture in the transparent separator 4. After extraction for more than half an hour, the control valve 406 is opened to transport the extracted solvent to the distillation equipment through the solvent tube 2 404. After the liquid level of the extraction solvent is flush with the top of the solvent tube 2 404, the control valve 406 on the solvent tube 2 404 is closed, and the extraction solvent is then transported to the transparent separator 4 through the solvent tube 1 403. The methyl lactate produced by the cyclic extraction reaction is made so that in the reversible process of the esterification reaction in the reaction chamber 102, the reaction moves in the direction of producing more products, the reactants react more fully, and the yield of methyl lactate is higher.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An esterification tower for the production and processing of methyl lactate, comprising an esterification tower shell (1), a circulation pump (2), a heating jacket (3) and a transparent liquid separation tank (4), characterized in that: An inner insulation shell (101) is fixed on the inner wall of the esterification tower shell (1), a reaction chamber (102) is fixed on the inner wall of the inner insulation shell (101), a heating jacket (3) is fixed on the lower part of the inner wall of the reaction chamber (102), a circulation pump (2) is fixed at the center of the bottom end of the esterification tower shell (1), a transparent liquid separation tank (4) is provided on one side of the esterification tower shell (1), a reflux pipe (405) is fixedly connected to the center of the bottom end of the transparent liquid separation tank (4), a second solvent pipe (404) is fixedly passed through the bottom end of the transparent liquid separation tank (4) on one side of the reflux pipe (405), and a first solvent pipe (403) is fixedly connected to the top end of the transparent liquid separation tank (4).

2. The esterification tower for the production and processing of methyl lactate according to claim 1, characterized in that: The top of the reaction chamber (102) is fixedly connected to a feed pipe (103), and the feed pipe (103) is fixed through the top of the esterification tower outer shell (1) and the inner insulation shell (101).

3. The esterification tower for the production and processing of methyl lactate according to claim 1, characterized in that: The input end and the output end of the circulation pump (2) are both fixedly connected to a circulation box (201); a connecting pipe (202) is fixedly provided at the top center of each circulation box (201); the two connecting pipes (202) are both fixedly connected to the outer shell (1) of the esterification tower and the bottom end of the inner insulation shell (101); the top ends of the two connecting pipes (202) are both fixedly connected to the bottom end of the reaction chamber (102); and a liquid outlet pipe (203) is fixedly provided at the bottom center of the circulation box (201) away from the transparent liquid separation tank (4).

4. The esterification tower for the production and processing of methyl lactate according to claim 3, characterized in that: The tops of the two circulation boxes (201) are both fixed to the bottom end of the esterification tower shell (1), and a heating plate (301) is fixed inside the heating jacket (3).

5. The esterification tower for the production and processing of methyl lactate according to claim 1, characterized in that: An input pipe (401) is fixedly connected to the lower part of the peripheral side of the transparent liquid separation tank (4); the input pipe (401) is fixed through the esterification tower outer shell (1) and the inner insulation shell (101) and is connected to the reaction chamber (102); and an on-off valve (402) is fixed to the peripheral side of the input pipe (401).

6. The esterification tower for the production and processing of methyl lactate according to claim 3, characterized in that: A reflux pipe (405) is fixedly connected to the center of the bottom end of the transparent liquid separation tank (4); one end of the reflux pipe (405) away from the transparent liquid separation tank (4) is fixed to a circulation box (201) at the input end of the circulation pump (2) and is connected to the circulation box (201); and control valves (406) are fixed to the second solvent pipe (404) below the transparent liquid separation tank (4) and the surrounding side of the reflux pipe (405).

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