A heating reaction vessel for isophthalic acid production

Abstract

The utility model discloses a heating reaction container for isophthalic acid preparation, concretely relates to heating reaction container technical field, including the reaction kettle, the reaction kettle top is equipped with the sealing cover fixedly, the sealing cover bottom center place is equipped with the round bar rotation, a plurality of heating rods that are annular array distribution are fixedly arranged on the round bar, two heating plates are fixedly arranged on the reaction kettle inner wall surface, is equipped with the rotating mechanism on the reaction kettle for supporting the rotation of reaction kettle, the rotating mechanism includes the support, and the both sides of support all are equipped with the pivot, the utility model discloses the heating rod in the reaction kettle can heat the material, can also agitate the material, promotes the mixed reaction of material, to this improves the preparation efficiency of isophthalic acid, and utilizes the rotating mechanism and supports the rotation of reaction kettle, on one hand, can shake the material in the jar and promote the heating rate, on the other hand can make the opening of reaction kettle downward, the inside of reaction kettle is cleaned conveniently, avoids the influence of residual material solidification to next reaction.

Description

Technical Field

[0001] This utility model relates to the field of heating reaction vessel technology, and more specifically to a heating reaction vessel for the preparation of trimellitic anhydride. Background Technology

[0002] Trimellitic anhydride, chemically known as trimellitic anhydride, is a white or slightly yellow flaky, needle-like crystal or powder. It is a key intermediate in fine chemicals. It can be used to synthesize trioctyl trimellitate, a non-toxic, heat-resistant, and migration-resistant PVC plasticizer suitable for wires and cables, medical devices, etc.; and to manufacture polyester resins, polyamide-imides, polyimides, etc., used in high-temperature insulating varnishes, powder coatings, etc. In the preparation of trimellitic anhydride (TMA), heating the reaction vessel is necessary. The core purpose of heating the reaction vessel is to solve the problem of insufficient heat in the later stages of the reaction, meet the high-temperature requirements for dehydration to anhydride, and simultaneously achieve precise temperature control to reduce by-products.

[0003] For example, the reaction vessel with uniform heating, disclosed in the prior art (CN206474130U), incorporates heating pipes inside the shell. These pipes are filled with a liquid heat-conducting medium, which heats the interior of the shell. This results in a stable and uniform heating rate. Furthermore, the spirally wound heating pipes provide a large contact area and excellent heating effect. The pipes are interconnected, allowing for cyclical liquid intake and exhaust via the heating components. Moreover, this design solves the problem of significant energy loss in traditional water bath or oil bath heating processes, resulting in high thermal energy utilization.

[0004] However, the existing technology described above still has the following problems in use: When heating materials in a traditional heating reaction vessel, the materials remain stationary inside the vessel, leading to uneven heating and low heating efficiency. Furthermore, after heating, some material remains inside the vessel, affecting subsequent reactions. Since the reaction vessel is generally upward-facing and has considerable height, cleaning is difficult and the operation is time-consuming and labor-intensive. Therefore, this invention provides a heating reaction vessel for the preparation of trimellitic anhydride. Utility Model Content

[0005] To overcome the aforementioned deficiencies in the prior art, this utility model provides a heating reaction vessel for the preparation of trimellitic anhydride. The heating rod inside the reaction vessel can both heat and agitate the materials, promoting the mixing reaction and thus improving the preparation efficiency of trimellitic anhydride. The rotating mechanism supports the rotation of the reaction vessel, which on the one hand can shake the materials inside the vessel to promote the heating rate, and on the other hand can allow the opening of the reaction vessel to face downwards, facilitating the cleaning of the inside of the reaction vessel and preventing residual materials from solidifying and affecting the next reaction, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a heating reaction vessel for the preparation of trimellitic anhydride, comprising a reaction vessel, a sealing cover fixedly provided on the top of the reaction vessel, a circular rod rotatably provided at the bottom center of the sealing cover, a plurality of heating rods arranged in a ring array fixedly provided on the circular rod, two heating plates fixedly provided on the inner wall surface of the reaction vessel, and a rotating mechanism provided on the reaction vessel for supporting the rotation of the reaction vessel, the rotating mechanism comprising a bracket, a rotating shaft passing through both sides of the bracket, one end of the rotating shaft being fixed to the reaction vessel, a first motor being fixedly provided on one side of the bracket, and the output shaft of the first motor being fixed to the rotating shaft.

[0007] In a preferred embodiment, a mounting bracket is fixedly provided on the top of the sealing cover, and a second motor is fixedly provided on the top of the mounting bracket. The bottom end of the output shaft of the second motor is connected to the top of the round rod through a coupling. The second motor drives the round rod to rotate, thereby increasing the heating rate of the metaphthalic anhydride material.

[0008] In a preferred embodiment, the top of the round rod has a battery compartment, and the battery compartment contains multiple rechargeable batteries for providing power to multiple heating rods.

[0009] In a preferred embodiment, electric push rods are fixedly provided on both sides of the bracket, and a positioning rod is fixedly provided at one end of the piston rod of each of the two electric push rods. Two positioning grooves adapted to the positioning rods are opened on both sides of the outer wall of the reaction tank. The positioning rods are inserted into the positioning grooves, and the position of the positioning rods is automatically adjusted by the electric push rods, which makes it more time-saving and labor-saving to use.

[0010] In a preferred embodiment, a discharge pipe is connected to the center of the bottom of the reaction vessel, and an electromagnetic valve is fixedly installed on the discharge pipe. The electromagnetic valve controls the opening and closing of the discharge pipe to prevent leakage during the heating process.

[0011] In a preferred embodiment, a vent valve and a feed pipe are respectively passed through the top two sides of the sealing cap. A threaded cap is threadedly connected to the feed pipe to seal the feed pipe and prevent the inside of the reaction vessel from being contaminated.

[0012] In a preferred embodiment, a rubber sealing ring is provided between the reaction vessel and the sealing cap to fill the gap between them, and multiple evenly distributed fixing holes are provided at the bottom of the support to improve the stability of the support during use.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] This invention utilizes a heating rod inside the reaction vessel to both heat the trimellitic anhydride material and agitate it, promoting the mixing reaction and thus improving the preparation efficiency of trimellitic anhydride. Furthermore, a first motor drives a rotating shaft to rotate the reaction vessel within a support frame. This not only agitates the material inside the vessel, accelerating the heating rate, but also allows the reaction vessel opening to face downwards, facilitating thorough cleaning of the interior and preventing residual material from solidifying and affecting subsequent reactions.

[0015] The position of the positioning rod can be adjusted by electric push rod, and the positioning rod can be inserted into the positioning groove to stabilize the reaction vessel during the cleaning process. This eliminates the need for staff to hold the reaction vessel steady by hand, making it more time-saving and labor-saving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the rotating reaction vessel of this utility model;

[0018] Figure 3 This is a cross-sectional view of the reaction vessel of this utility model;

[0019] Figure 4 This is a schematic diagram of the round rod and heating rod of this utility model;

[0020] Figure 5 This is a top view of the overall structure of this utility model.

[0021] The attached figures are labeled as follows: 1. Reaction vessel; 2. Sealing cap; 3. Round rod; 4. Heating rod; 5. Heating plate; 6. Rotating mechanism; 61. Support; 62. Rotating shaft; 63. First motor; 7. Mounting bracket; 8. Second motor; 9. Battery compartment; 10. Electric push rod; 11. Positioning rod; 12. Positioning groove; 13. Discharge pipe; 14. Solenoid valve; 15. Vent valve; 16. Feed pipe; 17. Threaded cap; 18. Rubber sealing ring. Detailed Implementation

[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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Refer to the instruction manual appendix Figures 1-5This utility model provides a heating reaction vessel for the preparation of trimellitic anhydride, including a reaction vessel 1. A sealing cover 2 is fixedly provided on the top of the reaction vessel 1, and a rubber sealing ring 18 is provided between the reaction vessel 1 and the sealing cover 2 to fill the gap between them and prevent leakage. A bracket 61 has multiple evenly distributed fixing holes at the bottom. A round rod 3 is rotatably provided at the bottom center of the sealing cover 2. A mounting bracket 7 is fixedly provided on the top of the sealing cover 2. A second motor 8 is fixedly provided on the top of the mounting bracket 7. The bottom end of the output shaft of the second motor 8 is connected to the top of the round rod 3 through a coupling. Multiple heating rods 4 are fixedly provided on the round rod 3 in a ring array. Two heating plates 5 are fixedly provided on the inner wall surface of the reaction vessel 1.

[0024] The reaction vessel 1 is provided with a rotating mechanism 6 for supporting the rotation of the reaction vessel 1. The rotating mechanism 6 includes a bracket 61, and a rotating shaft 62 passes through both sides of the bracket 61. One end of the rotating shaft 62 is fixed to the reaction vessel 1. A first motor 63 is fixed on one side of the bracket 61, and the output shaft of the first motor 63 is fixed to the rotating shaft 62.

[0025] The bottom center of the reaction vessel 1 is connected to a discharge pipe 13, and a solenoid valve 14 is fixedly installed on the discharge pipe 13. A vent valve 15 and a feed pipe 16 pass through the top two sides of the sealing cover 2, respectively, and a threaded cover 17 is threadedly connected to the feed pipe 16.

[0026] In practical use, the staff pours the material for preparing trimellitic anhydride into the reaction vessel 1 through the feed pipe 16. Then, the second motor 8 drives the circular rod 3 to rotate. The multiple heating rods 4 on the circular rod 3 can both heat and stir the material, promoting the mixing reaction and thus improving the preparation efficiency of trimellitic anhydride. After heating, the solenoid valve 14 on the discharge pipe 13 is opened first to discharge the material. Then, the first motor 63 drives the rotating shaft 62 to rotate the reaction vessel 1 within the support 61, so that the opening of the reaction vessel 1 faces downwards, making it convenient for the staff to remove the sealing cap 2 and clean the inside of the reaction vessel 1, preventing residual material from solidifying and affecting the next reaction. In this embodiment, the support 61 supports the rotation of the reaction vessel 1, which not only makes it easier for the staff to clean the inside of the reaction vessel 1 more thoroughly and to drain the wastewater after cleaning, but also allows the reaction vessel 1 to shake back and forth during the heating process, causing the material inside the vessel to shake, thereby greatly improving the heating rate and preparation efficiency.

[0027] Refer to the instruction manual appendix Figure 1 and Figure 2Both sides of the bracket 61 are fixedly provided with electric push rods 10, and one end of the piston rod of each of the two electric push rods 10 is fixedly provided with a positioning rod 11. Two positioning grooves 12 adapted to the positioning rods 11 are opened on both sides of the outer wall of the reaction tank 1. The positioning rods 11 are inserted into the positioning grooves 12. When the opening of the reaction tank 1 is rotated downward, the electric push rods 10 extend to drive the positioning rods 11 to insert into the positioning grooves 12, thereby fixing the reaction tank 1.

[0028] Refer to the instruction manual appendix Figure 4 The top of the round rod 3 is provided with a battery compartment 9, which contains multiple rechargeable batteries. The battery compartment 9 is placed inside the round rod 3 and then directly connected to the heating rod 4 with a wire to provide power to the multiple heating rods 4. At the same time, a wireless remote control switch can be set inside the battery compartment 9 to facilitate remote start and stop of the heating rods 4. Since the above is already well known technology, it will not be described in detail here.

[0029] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heating reaction vessel for the preparation of trimellitic anhydride, comprising a reaction vessel (1), characterized in that: The top of the reaction vessel (1) is fixedly provided with a sealing cover (2), and a round rod (3) is rotatably provided at the bottom center of the sealing cover (2). Multiple heating rods (4) arranged in a ring array are fixedly provided on the round rod (3), and two heating plates (5) are fixedly provided on the inner wall surface of the reaction vessel (1). The reaction vessel (1) is provided with a rotating mechanism (6) for supporting the rotation of the reaction vessel (1). The rotating mechanism (6) includes a bracket (61), and a rotating shaft (62) passes through both sides of the bracket (61). One end of the rotating shaft (62) is fixed to the reaction vessel (1). A first motor (63) is fixed on one side of the bracket (61), and the output shaft of the first motor (63) is fixed to the rotating shaft (62).

2. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: The sealing cover (2) is fixedly provided with a mounting bracket (7), and the mounting bracket (7) is fixedly provided with a second motor (8). The bottom end of the output shaft of the second motor (8) is connected to the top of the round rod (3) through a coupling.

3. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: The top of the round rod (3) is provided with a battery compartment (9), and the battery compartment (9) contains multiple rechargeable batteries.

4. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: Electric push rods (10) are fixed on both sides of the bracket (61). One end of the piston rod of each of the two electric push rods (10) is fixed with a positioning rod (11). Two positioning grooves (12) that are compatible with the positioning rods (11) are opened on both sides of the outer wall of the reaction tank (1). The positioning rods (11) are inserted into the positioning grooves (12).

5. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: The bottom center of the reaction vessel (1) is connected to a discharge pipe (13), and a solenoid valve (14) is fixedly installed on the discharge pipe (13).

6. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: The sealing cap (2) has a vent valve (15) and a feed pipe (16) passing through its top two sides respectively, and a threaded cap (17) is threaded onto the feed pipe (16).

7. The heating reaction vessel for preparing trimellitic anhydride according to claim 1, characterized in that: A rubber sealing ring (18) is provided between the reaction vessel (1) and the sealing cover (2) to fill the gap between them, and a plurality of evenly distributed fixing holes are provided at the bottom of the bracket (61).

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