Thioether synthesis reaction waste heat recovery device

Abstract

The utility model relates to the technical field of heat energy recovery in chemical production, and concretely is a sulfide synthetic reaction waste heat recovery device, including the reaction kettle and the lid setting on the reaction kettle, the lid has set up the feed inlet and the gas outlet, and the feed hole is sealed through the sealing cover, and one end of the gas outlet is connected with the gas outlet pipe, and the other end of the gas outlet pipe is communicated with the hot gas inlet end of the heat exchanger, the upper end of the standpipe is communicated with the gas outlet end of the air pump, and the air pump is arranged outside the reaction kettle. The application can realize the heating of the normal temperature gas by inputting the normal temperature gas into the reaction kettle, ensure that the heated gas can enter the heat exchanger to realize heat exchange, avoid the blockage of the heat exchanger under the premise of meeting the heat exchange, and further ensure the normal use.

Description

Technical Field

[0001] This utility model belongs to the field of heat energy recovery technology in chemical production, specifically a waste heat recovery device for sulfide synthesis reaction. Background Technology

[0002] Thioethers are important organic synthesis intermediates and fine chemical products, widely used in pharmaceuticals, pesticides, materials science, and other fields. Their synthesis typically involves the reaction of thiols (or thiophenols) with haloalkanes (or alcohols) under basic conditions (such as the Williamson synthesis), or through methods such as the addition reaction of thiols with alkenes. These thioether synthesis reactions usually release a large amount of heat, and the reaction temperatures are often quite high.

[0003] To reduce energy consumption and improve the economic and environmental efficiency of processes, effectively recovering and utilizing waste heat from the reaction is a crucial aspect of production. Currently, the industry commonly employs a waste heat recovery method that involves directly introducing the still-high-temperature sulfide synthesis reaction mixture (containing the target sulfide product, solvent, unreacted raw materials, catalyst, byproducts, etc.) into a heat exchanger (such as a shell-and-tube heat exchanger or a plate heat exchanger). Inside the heat exchanger, the high-temperature reaction mixture transfers heat to a cooling medium (usually water), heating the water into warm water or low-pressure steam for use in other processes or living facilities, thereby achieving waste heat recovery.

[0004] However, this existing technology, which directly introduces the high-temperature reaction mixture into the heat exchanger for waste heat recovery, has a significant and urgent problem: the mixture after the sulfide synthesis reaction typically has a high viscosity. While the mixture remains relatively fluid at high temperatures, its viscosity increases dramatically and its fluidity deteriorates significantly as the temperature decreases after entering the heat exchanger. This high viscosity means that the viscous material easily adheres to the heat exchanger walls, tube walls, or plates when the reaction mixture flows through narrow channels (such as heat exchange tubes and plate gaps). Over time, this adhered material accumulates and solidifies, forming a stubborn scale layer that ultimately leads to severe blockage of the heat exchanger channels, affecting its normal operation. Utility Model Content

[0005] This invention provides a waste heat recovery device for sulfide synthesis reaction to overcome the deficiencies in the prior art.

[0006] This utility model is achieved through the following technical solution: A waste heat recovery device for sulfide synthesis reaction includes a reactor and a cover installed on the reactor. The cover has an inlet and an outlet. The inlet is sealed by a sealing cap. One end of the outlet is connected to an outlet pipe, and the other end of the outlet pipe is connected to the hot gas inlet of a heat exchanger. A vertical pipe is installed inside the reactor. The upper end of the vertical pipe is connected to the outlet of a gas pump, and the gas pump is installed outside the reactor.

[0007] In use, this invention utilizes an air pump to blow external gas into the reactor through a vertical pipe. Because the reactor is sealed and the reactants and gas do not mix, the heated gas can exit through the outlet pipe and enter the heat exchanger, thus heating the heat exchanger. This not only heats the heat exchanger but also prevents pipe blockage problems that can occur during prolonged use.

[0008] Preferably, the vertical tube is vertically connected to and communicates with several horizontal tubes along its height. The outer end of each horizontal tube is closed, and an air outlet is provided along its length. The lower part of the vertical tube has a tapered structure that is wider at the top and narrower at the bottom. The tapered structure at the bottom of the vertical tube reduces the amount of air escaping from the vertical tube, allowing gas to flow out from the horizontal tubes. Since gas also flows out from the air outlets of the horizontal tubes and the vertical tubes, the heating area of ​​the gas is increased, resulting in better heating of the gas.

[0009] Preferably, the riser includes an upper riser and a lower riser connected by a flange. The upper riser is connected to the air outlet of the air pump, and the horizontal pipe is connected to the lower riser. The upper and lower risers are detachably and fixedly connected, allowing for disassembly of the riser for easy maintenance and cleaning.

[0010] Preferably, the vertical pipe extends through the cover and is rotatably connected to the cover via a bearing. The air pump outlet is connected to a horizontally arranged air inlet pipe. The water inlet pipe is perpendicular to the upper vertical pipe and rotatably connected via a sealed bearing. The upper vertical pipe is driven by a drive mechanism to rotate along its axis. The rotation of the upper vertical pipe, driven by the drive mechanism, drives the rotation of the lower vertical pipe, which in turn drives the horizontal pipe to rotate. This not only achieves stirring of the reactants, making the reaction more thorough, but also increases the gas outflow point, achieving better heating of the gas.

[0011] Preferably, the drive mechanism includes a drive motor, which is fixedly mounted on the cover. A drive gear is coaxially and fixedly sleeved on the drive motor's shaft, and a driven gear that meshes with the drive gear is fixedly sleeved on the upper vertical tube. When the drive motor is started, the rotation of the drive motor's shaft drives the rotation of the drive gear, which in turn drives the rotation of the driven gear, thereby driving the rotation of the upper vertical tube.

[0012] Preferably, the outlet end of the gas pipe is connected to the pressure tank, and the pressure pipe is connected to a connecting pipe, which is connected to the hot gas inlet end of the heat exchanger. A pressure relief valve is provided at the top of the pressure tank, and a one-way valve flowing towards the pressure tank is provided on the gas outlet pipe. Under the action of the air pump, heated gas is injected into the pressure tank, so that the hot gas in the pressure tank has a certain pressure, and can be depressurized when the pressure is too high. This ensures that the flow rate of the hot gas entering the heat exchanger remains as constant as possible under constant pressure, thereby ensuring that the water heated by the heat exchanger is kept at a similar temperature. The one-way valve prevents the gas in the pressure tank from flowing back.

[0013] The beneficial effects of this utility model are as follows: By introducing room temperature gas into the reaction vessel, the reactants can heat the room temperature gas and ensure that the heated gas can enter the heat exchanger to achieve heat exchange. Under the premise of satisfying heat exchange, the heat exchanger is prevented from being blocked, thereby ensuring its normal use. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0016] As shown in the figure: 1. Reactor, 2. Lid, 3. Vertical pipe, 4. Horizontal pipe, 5. Air pump, 6. Air outlet pipe, 7. Heat exchanger, 8. Pressure tank, 9. Drive motor, 10. Drive gear, 11. Driven gear, 31. Upper vertical pipe, 32. Lower vertical pipe. Detailed Implementation

[0017] 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. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] Waste heat recovery device for sulfide synthesis reaction, such as Figure 1As shown. It includes a reaction vessel 1 and a cover 2 mounted on the reaction vessel 1. The cover 2 has a feed inlet and a vent. The feed inlet is sealed by a sealing cap. One end of the vent is connected to a vent pipe 6, and the other end of the vent pipe 6 is connected to the hot air inlet of a heat exchanger 7. A vertical pipe 3 is installed inside the reaction vessel 1. The upper end of the vertical pipe 3 is connected to the vent of an air pump 5. The vertical pipe 3 is vertically connected to several horizontal pipes 4 along its height. The outer ends of the horizontal pipes 4 are closed, and vent holes are opened along their length. The lower part of the vertical pipe 3 has a tapered structure that is wider at the top and narrower at the bottom. The air pump 5 is located outside the reaction vessel 1.

[0019] In use, the air pump 5 draws external gas into the upper vertical pipe 31. The lower part of the vertical pipe 31 has a conical structure, which reduces the gas output at the vertical pipe 3, allowing the gas to flow out through the horizontal pipe 4. Gas also flows out through the outlet of the horizontal pipe 4 and the vertical pipe 3, increasing the gas's heating area and achieving better heating. After the gas is blown into the reaction vessel 1, since the reaction vessel 1 is in a closed state and the reactants and gas do not mix, the heated gas can be discharged through the outlet pipe 6 and then enter the heat exchanger 7 to heat the heat exchanger 7. This not only satisfies the heating needs of the heat exchanger 7 but also avoids pipe blockage problems that may occur during long-term use.

[0020] The vertical pipe 3 includes an upper vertical pipe 31 and a lower vertical pipe 32 connected by a flange. The upper vertical pipe 31 is connected to the air outlet of the air pump 5, and the horizontal pipe 4 is connected to the lower vertical pipe 32. The upper vertical pipe 31 and the lower vertical pipe 32 are detachably and fixedly connected, which allows the vertical pipe 3 to be disassembled for easy maintenance and cleaning.

[0021] The vertical pipe 3 extends through the cover 2 and is rotatably connected to the cover 2 via a bearing. The air outlet of the air pump 5 is connected to a horizontally arranged air inlet pipe. The water inlet pipe is perpendicular to the upper vertical pipe 31 and is rotatably connected to it via a sealed bearing. The upper vertical pipe 31 is driven by a drive mechanism to rotate along its axis. The rotation of the upper vertical pipe 31 under the drive mechanism can drive the rotation of the lower vertical pipe 32, which in turn drives the horizontal pipe 4 to rotate. This not only achieves stirring of the reactants, making the reaction more thorough, but also increases the position of gas outflow, achieving better heating of the gas.

[0022] The drive mechanism includes a drive motor 9, which is fixedly mounted on the cover 2. A drive gear 10 is coaxially and fixedly sleeved on the shaft of the drive motor 9, and a driven gear 11 that meshes with the drive gear 10 is fixedly sleeved on the upper vertical tube 31. When the drive motor 9 is started, the rotation of the drive motor 9 shaft drives the rotation of the drive gear 10, which in turn drives the rotation of the driven gear 11, thereby driving the rotation of the upper vertical tube 31.

[0023] The outlet pipe 6 is connected to the pressure tank 8, and a connecting pipe is connected to the hot air inlet of the heat exchanger 7. A pressure relief valve is installed at the top of the pressure tank 8, and a one-way valve is installed on the outlet pipe 6, extending towards the pressure tank 8. Under the action of the air pump 5, heated gas is injected into the pressure tank 8, ensuring a certain pressure in the hot gas inside. This pressure relief allows for pressure release when the pressure is too high, thus maintaining a constant flow rate of the hot gas entering the heat exchanger 7 under constant pressure. This ensures that the water heated by the heat exchanger 7 is kept at a relatively constant temperature, while the one-way valve prevents backflow of gas from the pressure tank 8.

[0024] The use of this application enables the reactants to heat the room temperature gas by introducing room temperature gas into the reactor 1, and ensures that the heated gas can enter the heat exchanger 7 to achieve heat exchange. Under the premise of satisfying heat exchange, the heat exchanger 7 is prevented from being blocked, thereby ensuring its normal use.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste heat recovery device for sulfide synthesis reaction, characterized in that: The device includes a reaction vessel and a lid mounted on the reaction vessel. The lid has an inlet and an outlet. The inlet is sealed by a sealing cap. One end of the outlet is connected to an outlet pipe, and the other end of the outlet pipe is connected to the hot air inlet of a heat exchanger. A vertical pipe is installed inside the reaction vessel. The upper end of the vertical pipe is connected to the outlet of an air pump, and the air pump is located outside the reaction vessel.

2. The waste heat recovery device for sulfide synthesis reaction according to claim 1, characterized in that: The vertical tube is vertically connected to several horizontal tubes along its height direction. The outer end of each horizontal tube is closed and an air vent is provided along its length direction. The lower part of the vertical tube has a tapered structure that is wider at the top and narrower at the bottom.

3. The waste heat recovery device for sulfide synthesis reaction according to claim 2, characterized in that: The vertical pipe includes an upper vertical pipe and a lower vertical pipe connected by a flange. The upper vertical pipe is connected to the air outlet of the air pump, and the horizontal pipe is connected to the lower vertical pipe.

4. The waste heat recovery device for sulfide synthesis reaction according to claim 3, characterized in that: The upper vertical pipe extends through the cover and is rotatably connected to the cover via a bearing. The air pump outlet is connected to a horizontally arranged air inlet pipe. The water inlet pipe is perpendicular to the upper vertical pipe and is rotatably connected and connected via a sealed bearing. The upper vertical pipe is driven by a drive mechanism to rotate along its axis.

5. The waste heat recovery device for sulfide synthesis reaction according to claim 4, characterized in that: The driving mechanism includes a drive motor, which is fixedly mounted on the cover. The drive motor's shaft is coaxially and fixedly sleeved with a drive gear, and a driven gear that meshes with the drive gear is fixedly sleeved on the upper vertical tube.

6. The waste heat recovery device for sulfide synthesis reaction according to claim 1, characterized in that: The outlet end of the vent pipe is connected to the pressure tank, and the pressure pipe is connected to a connecting pipe, which is connected to the hot air inlet end of the heat exchanger. A pressure relief valve is provided on the top of the pressure tank, and a one-way valve that flows through the pressure tank is provided on the vent pipe.

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