Preparation device for diethylene glycol dibenzoate

Abstract

The preparation device comprises a reaction kettle, a support is arranged outside the reaction kettle, material control measuring cylinders are installed on the two sides of the top end of the support, scale marks are marked on the outer walls of the material control measuring cylinders, a discharging pipe is installed on one side of the bottom end of each material control measuring cylinder, and a feeding pipe is installed on the other side of the bottom end of each material control measuring cylinder. The device comprises a material control measuring cylinder, a piston plate is arranged in the material control measuring cylinder, a threaded sleeve is fixed to the center of the top end of the material control measuring cylinder, a threaded rod is in threaded connection with the interior of the threaded sleeve, an overflow pipe is installed on one side of the top end of the piston plate, a guide pipe is installed at the bottom end of the overflow pipe, and a material control valve is installed in the guide pipe. And a feeding pipe is arranged on one side in the material control measuring cylinder. According to the utility model, the ratio of benzoic acid to diethylene glycol can be accurately controlled, so that the preparation quality of diethylene glycol dibenzoate is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of diethylene glycol dibenzoate preparation technology, specifically to an apparatus for preparing diethylene glycol dibenzoate. Background Technology

[0002] Diethylene glycol dibenzoate is a plasticizer for various resins such as polyvinyl chloride (PVC) and polyvinyl acetate (PVC). It features good solubility, good compatibility, low volatility, and excellent resistance to oil, water, light, and stains. It is suitable for processing PVC flooring materials, plasticizer pastes, ethyl polyester adhesives, and synthetic rubber.

[0003] In the preparation of diethylene glycol dibenzoate, benzoic acid and diethylene glycol are mixed and heated, then pumped into the upper part of a catalytic distillation column. After reacting in the catalytic distillation section, diethylene glycol dibenzoate is obtained in the bottom of the column. The material at the top of the column is separated by a separator to remove the water produced in the reaction and to recover unreacted benzoic acid. However, the diethylene glycol dibenzoate preparation equipment generally makes it difficult to control the ratio of benzoic acid to diethylene glycol. Excess diethylene glycol may lead to a decrease in conversion rate or difficulties in subsequent separation, thus requiring improvement. Utility Model Content

[0004] The purpose of this invention is to provide an apparatus for preparing diethylene glycol dibenzoate, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an apparatus for preparing diethylene glycol dibenzoate, comprising a reaction vessel, wherein a stirring rod is disposed inside the reaction vessel, and stirring blades at equal intervals are installed on the outer wall of the stirring rod; a discharge pipe is installed at the bottom end of the reaction vessel, and a discharge valve is installed at the connection between the discharge pipe and the reaction vessel; a support is disposed outside the reaction vessel, and a motor is installed at the center of the top end of the support, and the output end of the motor is fixedly connected to the stirring rod; and two sides of the top end of the support are equipped with... The measuring cylinder has graduation lines marked on its outer wall. A feed pipe is installed on one side of the bottom of the measuring cylinder. A piston plate is installed inside the measuring cylinder. A threaded sleeve is fixed at the center of the top of the measuring cylinder. A threaded rod is threadedly connected inside the threaded sleeve. The bottom end of the threaded rod is connected to the piston plate through a bearing. An overflow pipe is installed on one side of the top of the piston plate. A guide pipe is installed at the bottom of the overflow pipe. A material control valve is installed inside the guide pipe. A feed pipe is provided on one side inside the measuring cylinder.

[0006] Preferably, the stirring rod has a heating chamber inside, and a second heating rod is installed inside the heating chamber.

[0007] Preferably, four sets of stirring rods are fixed to the outside of the stirring rod, and a first heating rod is installed inside the stirring rod.

[0008] Preferably, a thermometer is installed on the outer wall of the reactor, with the sensing end of the thermometer extending into the interior of the reactor.

[0009] Preferably, the bottom end of the feeding tube extends into the interior of the overflow tube, and the top end of the feeding tube extends into the exterior of the control measuring cylinder.

[0010] Preferably, the plane at the bottom end of the conduit is coplanar with the plane at the bottom end of the piston plate.

[0011] Preferably, a sealing ring is adhered to the outer wall of the piston plate, and the sealing ring is tightly fitted to the inner wall of the material control cylinder.

[0012] Preferably, a discharge valve is installed inside the discharge pipe, and the bottom end of the discharge pipe extends into the interior of the reactor.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] Rotate the threaded rod to move the piston plate upward, and move the piston plate to the required scale value. Connect the raw material supply pipes of benzoic acid and diethylene glycol to the feeding pipes inside the two control cylinders respectively. Add benzoic acid and diethylene glycol to the overflow pipe through the feeding pipes. The raw materials are added to the control cylinder below the piston plate through the conduit. When the raw material is full, the excess raw material is poured into the overflow pipe. The control valve is closed and no more raw material is added. At this time, the raw material filled below the piston plate is the raw material amount that meets the ratio. Then open the discharge valve so that the raw material in the control cylinder is added to the reactor through the discharge pipe. This design can accurately control the ratio of benzoic acid and diethylene glycol, thereby ensuring the preparation quality of diethylene glycol dibenzoate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is an enlarged cross-sectional view of the material control measuring cylinder of this utility model;

[0017] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0018] Figure 4 This is an enlarged structural schematic diagram of the stirring rod of this utility model;

[0019] Figure 5 This is a partially enlarged cross-sectional view of the stirring rod of this utility model.

[0020] In the diagram: 1. Reactor; 2. Stirring rod; 3. Stirring blade; 4. Support; 5. Measuring cylinder; 6. Scale line; 7. Motor; 8. Thermometer; 9. Discharge pipe; 10. Discharge valve; 11. Feeding pipe; 12. Threaded sleeve; 13. Threaded rod; 14. Piston plate; 15. Sealing ring; 16. Feed pipe; 17. Feed valve; 18. Overflow pipe; 19. Measuring valve; 20. Guide tube; 21. Stirring rod; 22. First heating rod; 23. Heating chamber; 24. Second heating rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] Please see Figure 1-5 An embodiment of this utility model is provided: an apparatus for preparing diethylene glycol dibenzoate, including a reaction vessel 1, a stirring rod 2 is provided inside the reaction vessel 1, and stirring blades 3 with equal spacing are installed on the outer wall of the stirring rod 2. A discharge pipe 9 is installed at the bottom end of the reaction vessel 1, and a discharge valve 10 is installed at the connection between the discharge pipe 9 and the reaction vessel 1.

[0024] The reactor 1 is equipped with a support 4 on its exterior, and a motor 7 is installed at the center of the top of the support 4. The output end of the motor 7 is fixedly connected to the stirring rod 2. A material control cylinder 5 is installed on both sides of the top of the support 4. The outer wall of the material control cylinder 5 is marked with graduation lines 6. A feed pipe 16 is installed on one side of the bottom of the material control cylinder 5. A piston plate 14 is installed inside the material control cylinder 5. A threaded sleeve 12 is fixed at the center of the top of the material control cylinder 5. A threaded rod 13 is threadedly connected inside the threaded sleeve 12. The bottom end of the threaded rod 13 is connected to the piston plate 14 through a bearing. An overflow pipe 18 is installed on one side of the top of the piston plate 14. A conduit 20 is installed at the bottom of the overflow pipe 18. A material control valve 19 is installed inside the conduit 20. A feed pipe 11 is installed on one side of the inside of the material control cylinder 5.

[0025] Specifically, the ratio of benzoic acid and diethylene glycol is determined. Different values ​​of scale line 6 represent different capacities inside the control cylinder 5. Rotate the threaded rod 13 to move the piston plate 14 upward. Move the piston plate 14 to the desired value of scale line 6. The internal space of the control cylinder 5 below the piston plate 14 is the corresponding capacity.

[0026] Secondly, the raw material supply pipes for benzoic acid and diethylene glycol are connected to the feeding pipes 11 inside the two control cylinders 5, respectively. Benzoic acid and diethylene glycol are added to the overflow pipe 18 through the feeding pipes 11. The raw materials are added to the control cylinder 5 below the piston plate 14 through the conduit 20. When the raw material is full, the excess raw material is poured into the overflow pipe 18. The control valve 19 is closed and no more raw material is added. At this time, the raw material filled below the piston plate 14 is the raw material quantity that meets the ratio. Then, the discharge valve 17 is opened so that the raw material in the control cylinder 5 is added to the reaction vessel 1 through the discharge pipe 16. This design can accurately control the ratio of benzoic acid and diethylene glycol, thereby ensuring the preparation quality of diethylene glycol dibenzoate.

[0027] The stirring rod 2 has a heating chamber 23 inside, and a second heating rod 24 is installed inside the heating chamber 23; four sets of stirring rods 21 are fixed on the outside of the stirring rod 2, and a first heating rod 22 is installed inside the stirring rod 21.

[0028] Motor 7 drives stirring rod 2 to rotate, stirring rod 2 drives stirring blade 3 and stirring rod 21 to rotate, stirring benzoic acid and diethylene glycol. Since a second heating rod 24 is installed in the heating chamber 23 inside the stirring rod 2, and a first heating rod 22 is installed inside the stirring rod 21, the second heating rod 24 heats the raw material located in the middle, and the first heating rod 22 heats the raw material located on the outside. The use of center heating and edge heating makes the heat distribution uniform and the heat transfer rapid. Finally, the discharge valve 10 is opened so that the external pump body inputs the raw material into the catalytic distillation column through the discharge pipe 9.

[0029] A thermometer 8 is installed on the outer wall of the reactor 1, and the sensing end of the thermometer 8 extends into the interior of the reactor 1.

[0030] The bottom end of the feeding pipe 11 extends into the interior of the overflow pipe 18, and the top end of the feeding pipe 11 extends into the exterior of the material control cylinder 5.

[0031] The plane at the bottom end of the conduit 20 is coplanar with the plane at the bottom end of the piston plate 14.

[0032] A sealing ring 15 is adhered to the outer wall of the piston plate 14, and the sealing ring 15 is tightly fitted to the inner wall of the material control cylinder 5.

[0033] A discharge valve 17 is installed inside the discharge pipe 16, and the bottom end of the discharge pipe 16 extends into the interior of the reactor 1.

[0034] In this embodiment, the following steps are taken: First, the ratio of benzoic acid to diethylene glycol is determined. Different values ​​on the scale 6 represent different capacities inside the control cylinder 5. The threaded rod 13 is rotated to move the piston plate 14 upwards, positioning the piston plate 14 at the desired scale 6 value. The internal space of the control cylinder 5 below the piston plate 14 represents the corresponding capacity. Second, the feed pipes for benzoic acid and diethylene glycol are connected to the feeding pipes 11 inside the two control cylinders 5, respectively. Benzoic acid and diethylene glycol are added to the overflow pipe 18 through the feeding pipes 11. The raw materials are then added to the control cylinder 5 below the piston plate 14 through the conduit 20. When the raw material is full, any excess material is poured into the overflow pipe 18. The control valve 19 is closed, and no more raw material is added. At this point, the amount of raw material filling the space below the piston plate 14 is the correct ratio. The feed valve 17 is opened, allowing the raw material in the control cylinder 5 to be added into the reactor 1 through the feed pipe 16. This design can precisely control the ratio of benzoic acid and diethylene glycol, thereby ensuring the preparation quality of diethylene glycol dibenzoate. Then, the motor 7 drives the stirring rod 2 to rotate, and the stirring rod 2 drives the stirring blade 3 and stirring rod 21 to rotate, stirring the benzoic acid and diethylene glycol. Since the heating chamber 23 inside the stirring rod 2 is equipped with a second heating rod 24, and the stirring rod 21 is equipped with a first heating rod 22, the second heating rod 24 heats the raw material located in the middle, and the first heating rod 22 heats the raw material located on the outside. The use of center heating and edge heating makes the heat distribution uniform and the heat transfer rapid. Finally, the discharge valve 10 is opened, allowing the external pump to input the raw material into the catalytic distillation column through the discharge pipe 9.

[0035] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. An apparatus for preparing diethylene glycol dibenzoate, comprising a reaction vessel (1), wherein a stirring rod (2) is disposed inside the reaction vessel (1), and stirring blades (3) at equal intervals are installed on the outer wall of the stirring rod (2), a discharge pipe (9) is installed at the bottom end of the reaction vessel (1), and a discharge valve (10) is installed at the connection between the discharge pipe (9) and the reaction vessel (1), characterized in that, The reactor (1) is provided with a support (4) on its exterior, and a motor (7) is installed at the center of the top of the support (4). The output end of the motor (7) is fixedly connected to the stirring rod (2). A measuring cylinder (5) is installed on both sides of the top of the support (4), and a scale line (6) is marked on the outer wall of the measuring cylinder (5). A feed pipe (16) is installed on one side of the bottom of the measuring cylinder (5). A piston plate (14) is provided inside the measuring cylinder (5). (5) A threaded sleeve (12) is fixed at the center of the top, and a threaded rod (13) is connected to the inside of the threaded sleeve (12). The bottom end of the threaded rod (13) is connected to the piston plate (14) through a bearing. An overflow pipe (18) is installed on one side of the top of the piston plate (14), and a conduit (20) is installed at the bottom of the overflow pipe (18). A material control valve (19) is installed inside the conduit (20), and a feeding pipe (11) is provided on one side inside the material control cylinder (5).

2. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: The stirring rod (2) has a heating chamber (23) inside, and a second heating rod (24) is installed inside the heating chamber (23).

3. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: Four sets of stirring rods (21) are fixed on the outside of the stirring rod (2), and a first heating rod (22) is installed inside the stirring rod (21).

4. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: A thermometer (8) is installed on the outer wall of the reactor (1), and the detection end of the thermometer (8) extends into the interior of the reactor (1).

5. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: The bottom end of the feeding pipe (11) extends into the interior of the overflow pipe (18), and the top end of the feeding pipe (11) extends into the exterior of the control measuring cylinder (5).

6. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: The plane at the bottom of the conduit (20) is coplanar with the plane at the bottom of the piston plate (14).

7. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: A sealing ring (15) is adhered to the outer wall of the piston plate (14), and the sealing ring (15) is tightly fitted to the inner wall of the material control cylinder (5).

8. The apparatus for preparing diethylene glycol dibenzoate according to claim 1, characterized in that: The feed pipe (16) is equipped with a feed valve (17) inside, and the bottom end of the feed pipe (16) extends into the interior of the reactor (1).

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