Heating device for preparing sodium methoxide

Abstract

The utility model discloses a heating device for preparing sodium methoxide. The heating device comprises a heating box body, a temperature sensor is arranged on a discharging pipe, a heating pipe is arranged in the heating box body in an S shape, the top of the heating box body communicates with a condenser through an air outlet pipe, the discharging end of the condenser communicates with the heating box body through a backflow pipe, and multiple layers of molecular sieves are arranged in the backflow pipe. During use, a sodium hydroxide methanol solution is added into the heating box body through the feeding pipe, a reaction solution is heated through the heating pipe, the temperature of the heated reaction solution can be detected through the temperature sensor while the heated reaction solution is discharged through the discharging pipe, the temperature of the heating pipe is regulated and controlled according to the temperature value, and methanol gasification caused by too high temperature can be avoided. Meanwhile, even if part of methanol is gasified due to heating, the methanol can enter the condenser through the gas outlet pipe to be condensed, and the condensed methanol can enter the heating box body again through the return pipe after being in contact with the multi-layer molecular sieve for dehydration, so that the loss of raw materials can be avoided, and the subsequent preparation reaction is ensured to be carried out in the positive direction.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium methoxide preparation, in particular to a heating device for sodium methoxide preparation. Background Art

[0002] Sodium methoxide is a traditional chemical product with wide applications. It is mainly used as an intermediate raw material for preparing drugs such as sulfamethoxazole and vitamin A. At the same time, sodium methoxide is also a catalyst for organic synthesis, used in pesticide production and biodiesel. There are two forms of sodium methoxide products, namely solid and liquid. The solid is pure sodium methoxide, and the liquid is a methanol solution of sodium methoxide, in which the sodium methoxide content is 28.5% to 31%. According to different raw materials, the preparation process is mainly divided into the alkali method and the sodium method. The alkali method mainly uses sodium hydroxide and methanol as raw materials to react to produce sodium methoxide. Specifically, the methanol raw material needs to be gasified and then reacted with the sodium hydroxide methanol solution under certain conditions. The temperature during the preparation of sodium methoxide is relatively high, and the sodium hydroxide methanol solution needs to be heated before the reaction. However, methanol has a low boiling point, and during the heating process, part of the methanol is easily gasified, resulting in raw material loss, increasing the sodium hydroxide content in the solution, and then leading to incomplete reaction in the subsequent preparation process. At the same time, during this process, the gasified methanol is likely to carry moisture, which is not conducive to the forward progress of the subsequent preparation reaction. Summary of the Utility Model

[0003] The purpose of this application is to provide a heating device for sodium methoxide preparation to solve the problems that during the heating of the existing sodium hydroxide methanol solution, part of the methanol is easily gasified, resulting in raw material loss, increasing the sodium hydroxide content in the solution, and the gasified methanol is likely to carry moisture, thus leading to incomplete reaction in the subsequent preparation process and being not conducive to the forward progress of the subsequent preparation reaction.

[0004] To solve the above technical problems, this application provides a heating device for sodium methoxide preparation, including:

[0005] A heating box body, on one side of the upper part of the heating box body, there is a feed pipe, on one side of the lower part of the heating box body, there is a discharge pipe, a temperature sensor is arranged on the discharge pipe, a heating pipe is arranged in an S shape in the heating box body, the top of the heating box body is communicated with a condenser through an air outlet pipe, the discharge end of the condenser is communicated with the heating box body through a return pipe, multiple layers of molecular sieves are arranged in the return pipe, and control valves are arranged on both the feed pipe and the heating pipe.

[0006] On the basis of the above embodiment, as a preferred embodiment, there are three molecular sieves, which are the first molecular sieve, the second molecular sieve, and the third molecular sieve from bottom to top in sequence.

[0007] On the basis of the above embodiments, as a preferred embodiment, one end of the discharge pipe is further communicated with a reaction tank. A methanol gas inlet pipe is arranged at the lower part of one side of the reaction tank. A plurality of inclined partitions with opposite directions are arranged in the reaction tank. A first heating plate is arranged at the bottom of the reaction tank. An exhaust pipe is arranged at the top of the reaction tank. A discharge pipe is arranged at the bottom of the reaction tank.

[0008] It should be specifically noted in the solution that a second heating plate is also embedded on the inclined partition.

[0009] On the basis of the above embodiments, as a preferred embodiment, a vent pipe is further arranged at the top of the reaction tank, and a solenoid valve is arranged on the vent pipe.

[0010] Compared with the prior art, a heating device for preparing sodium methoxide provided by the utility model includes a heating box body. A feed pipe is arranged at one side of the upper part of the heating box body. A discharge pipe is arranged at one side of the lower part of the heating box body. A temperature sensor is arranged on the discharge pipe. A heating pipe is arranged in an S shape in the heating box body. The top of the heating box body is communicated with a condenser through an outlet pipe. The discharge end of the condenser is communicated with the heating box body through a reflux pipe. A multi-layer molecular sieve is arranged in the reflux pipe. Control valves are arranged on both the feed pipe and the heating pipe. When in use, the sodium hydroxide methanol solution is added into the heating box body through the feed pipe, and the reaction solution is heated by the heating pipe. While the heated reaction solution is discharged through the discharge pipe, its temperature can be detected by the temperature sensor, and the temperature of the heating pipe can be adjusted according to the temperature value, which can effectively avoid the gasification of methanol due to too high temperature during the heating process. At the same time, even if part of the methanol is gasified by heating, during the rising process, it will enter the condenser through the outlet pipe and be condensed. After the condensed methanol contacts the multi-layer molecular sieve for dehydration, it can enter the heating box body again through the reflux pipe, which can avoid the loss of raw materials and ensure that the subsequent preparation reaction proceeds in the positive direction, improving the quality and production efficiency of sodium methoxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is a schematic diagram of the internal structure of a heating device for preparing sodium methoxide provided by an embodiment of the present application;

[0013] Figure 2 It is a schematic diagram of the external structure of a heating device for preparing sodium methoxide provided by an embodiment of the present application;

[0014] In the figure: 1, heating box body; 2, feed pipe; 3, discharge pipe; 4, temperature sensor; 5, heating pipe; 6, gas outlet pipe; 7, condenser; 8, reflux pipe; 9, molecular sieve; 90, first molecular sieve; 91, second molecular sieve; 92, third molecular sieve; 10, control valve; 11, reaction tank; 12, methanol gas inlet pipe; 13, inclined partition plate; 14, first heating plate; 15, exhaust pipe; 16, discharge pipe; 17, second heating plate; 18, vent pipe; 19, solenoid valve. Detailed implementation mode

[0015] In order to enable those skilled in the art of this technology to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings.

[0016] The core of this application is to provide a heating device for the preparation of sodium methoxide, which solves the problems that in the heating process of the existing sodium hydroxide methanol solution, part of the methanol is easily vaporized, resulting in raw material loss, increasing the sodium hydroxide content in the solution, and the vaporized methanol is easily carried with water, which in turn leads to incomplete reactions in the subsequent preparation process and is not conducive to the forward progress of the subsequent preparation reaction.

[0017] Figure 1 It is a schematic diagram of the internal structure of a heating device for the preparation of sodium methoxide provided by an embodiment of this application. Figure 2 It is a schematic diagram of the external structure of a heating device for the preparation of sodium methoxide provided by an embodiment of this application. See Figures 1 to 2 as shown.

[0018] Embodiment 1

[0019] A heating device for preparing sodium methoxide, comprising a heating box body 1, the size and dimensions of the heating box body 1 can be determined according to the actual situation. On one side of the upper part of the heating box body 1, a feed pipe 2 is provided, and sodium hydroxide methanol solution enters the heating box body 1 through the feed pipe 2. On one side of the lower part of the heating box body 1, a discharge pipe 3 is provided, and a temperature sensor 4 is arranged on the discharge pipe 3. A heating pipe 5 is arranged in an S shape in the heating box body 1, and the sodium hydroxide methanol solution entering the heating box body 1 can be heated through the heating pipe 5. In actual use, high-temperature steam can be introduced into the heating pipe 5. The S-shaped arrangement of the heating pipe 5 can improve the heating efficiency. The heated sodium hydroxide methanol solution can be discharged through the discharge pipe 3. At this time, the temperature of the heated sodium hydroxide methanol solution can be detected by the temperature sensor 4 to adjust the heating temperature of the heating pipe 5 in real time according to the detected temperature value, which can effectively avoid the gasification of methanol due to too high temperature. The top of the heating box body 1 is connected to a condenser 7 through an exhaust pipe 6. The structure and working principle of the condenser 7 can refer to the prior art. The discharge end of the condenser 7 is connected to the heating box body 1 through a reflux pipe 8. The condenser 7 can condense part of the gasified methanol, and the condensed liquid methanol can flow back to the heating box body 1 through the reflux pipe 8 for reuse, avoiding waste of raw materials. A multi-layer molecular sieve 9 is arranged in the reflux pipe 8. The molecular sieve 9 has a uniform microporous structure and a strong affinity for water, and can realize the dehydration treatment of the condensed methanol; control valves 10 are arranged on both the feed pipe 2 and the heating pipe 5, which can ensure that when not in use, the control valves 10 are closed to prevent the leakage of internal gas or liquid in the heating box body 1.

[0020] Example 2

[0021] On the basis of the above Example 1, for a heating device for preparing sodium methoxide, considering the dehydration effect and the convenience of design, preferably, three molecular sieves 9 can be arranged in the reflux pipe 8, which are the first molecular sieve 90, the second molecular sieve 91 and the third molecular sieve 92 from bottom to top in sequence.

[0022] On the basis of the above Example 1, for a heating device for preparing sodium methoxide, in order to ensure the reaction effect and ensure that the reaction proceeds in the positive direction during the preparation of sodium methoxide, preferably, one end of the discharge pipe 3 is also connected to a reaction tank 11. A methanol gas inlet pipe 12 is arranged at the lower part of one side of the reaction tank 11. A plurality of inclined partitions 13 with opposite directions are arranged in the reaction tank 11. A first heating plate 14 is arranged at the bottom of the reaction tank 11. An exhaust pipe 15 is arranged at the top of the reaction tank 11. A discharge pipe 16 is arranged at the bottom of the reaction tank 11. The arrangement of the inclined partitions 13 can extend the residence time of methanol gas in the reaction tank 11, enabling the reactants to react fully. The arrangement of the first heating plate 14 can vaporize the water generated by the reaction and discharge it from the exhaust pipe 15, ensuring that the reaction proceeds in the positive direction.

[0023] In this embodiment, for a heating device for preparing sodium methoxide, in order to further improve the reaction efficiency, preferably, a second heating plate 17 is also inlaid on the inclined partition plate 13 to remove the water produced by the reaction in the form of steam, further making the reaction proceed in the forward direction.

[0024] In this embodiment, for a heating device for preparing sodium methoxide, an air vent pipe 18 is further provided at the top of the reaction tank 11, and a solenoid valve 19 is provided on the air vent pipe 18. During the reaction process, the solenoid valve 19 can be opened to prevent danger caused by unstable gas in the reaction tank 11.

[0025] A heating device for preparing sodium methoxide provided by the present utility model includes a heating box body 1. A feed pipe 2 is provided on one side of the upper part of the heating box body 1, a discharge pipe 3 is provided on one side of the lower part of the heating box body 1, a temperature sensor 4 is provided on the discharge pipe 3, a heating pipe 5 is arranged in an S shape in the heating box body 1, the top of the heating box body 1 is communicated with a condenser 7 through an air outlet pipe 6, the discharge end of the condenser 7 is communicated with the heating box body 1 through a reflux pipe 8, multiple layers of molecular sieves 9 are arranged in the reflux pipe 8, and control valves 10 are provided on both the feed pipe 2 and the heating pipe 5. When in use, a sodium hydroxide methanol solution is added into the heating box body 1 through the feed pipe 2, the reaction solution is heated by the heating pipe 5. While the heated reaction solution is discharged through the discharge pipe 3, its temperature can be detected by the temperature sensor 4, and the temperature of the heating pipe 5 can be adjusted according to the temperature value, which can effectively avoid methanol gasification due to too high temperature during the heating process. At the same time, even if part of the methanol is gasified by heating, during the rising process, it will enter the condenser 7 through the air outlet pipe 6 and be condensed. After the condensed methanol contacts the multiple layers of molecular sieves 9 for dehydration, it can enter the heating box body 1 again through the reflux pipe 8, which can avoid raw material loss and ensure that the subsequent preparation reaction proceeds in the positive direction to improve the quality and production efficiency of sodium methoxide.

[0026] Those skilled in the art will readily think of other embodiments of the present application after considering the specification and the practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field disclosed by the present application. The specification and the embodiments are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0027] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

1. A heating device for preparing sodium methoxide, characterized in that: include: A heating box (1) is provided with a feed pipe (2) on one side of the upper part of the heating box (1), a discharge pipe (3) is provided on one side of the lower part of the heating box (1), a temperature sensor (4) is provided on the discharge pipe (3), a heating pipe (5) is provided in an S-shape in the heating box (1), a condenser (7) is connected to the top of the heating box (1) through an air outlet pipe (6), a discharge end of the condenser (7) is connected to the heating box (1) through a reflux pipe (8), a multilayer molecular sieve (9) is provided in the reflux pipe (8), and control valves (10) are provided on both the feed pipe (2) and the heating pipe (5).

2. The heating device for preparing sodium methoxide according to claim 1, characterized in that: There are three molecular sieves (9), which are, from bottom to bottom, a first molecular sieve (90), a second molecular sieve (91) and a third molecular sieve (92).

3. The heating device for preparing sodium methoxide according to claim 1, characterized in that: One end of the discharge pipe (3) is also connected to a reaction tank (11); a methanol gas inlet pipe (12) is arranged at a lower part of one side of the reaction tank (11); a plurality of inclined partitions (13) in opposite directions are arranged inside the reaction tank (11); a first heating plate (14) is arranged at the bottom of the reaction tank (11); an exhaust pipe (15) is arranged at the top of the reaction tank (11); and a discharge pipe (16) is arranged at the bottom of the reaction tank (11).

4. The heating device for preparing sodium methoxide according to claim 3, characterized in that: A second heating plate (17) is also embedded on the inclined partition plate (13).

5. The heating device for preparing sodium methoxide according to claim 3, characterized in that: A vent pipe (18) is also provided on the top of the reaction tank (11), and a solenoid valve (19) is provided on the vent pipe (18).

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