Cracking kettle for preparing sebacic acid by cracking castor oil

Abstract

The utility model discloses a cracking kettle for preparing sebacic acid by cracking castor oil. The device is characterized in that a cracking kettle body is divided into an upper-layer kettle and a lower-layer kettle, and the upper-layer kettle and the lower-layer kettle are separated by a separation plate; a plurality of gas dispersion channels are distributed on the isolation plate; the gas dispersion channel is made of a non-sticky high-temperature-resistant material, the gas dispersion channel is a bevel channel, and the inlet end and the outlet end are symmetrically arranged up and down; a feeding channel is arranged above the cracking kettle body, an internal channel is arranged at the top in the cracking kettle body, a through hole is formed in the isolation plate, and the internal channel penetrates through the through hole of the isolation plate and is communicated with the lower-layer kettle; the feeding channel penetrates into the cracking kettle body and is communicated with the internal channel; the inner channel is a double-layer pipeline, the inner space is a stirring rod channel, and the outer space is a feed liquid channel; the stirring rod penetrates through the stirring rod channel and extends into the lower-layer kettle; the stirring paddle is spirally arranged at the lower end of the stirring rod. The gas outlet can be protected, the gas outlet is prevented from being blocked by non-gas products, and smooth output of the gas products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sebacic acid preparation, in particular to a cracking kettle used for preparing sebacic acid by cracking castor oil. Background Art

[0002] Sebacic acid is a white flaky crystal, slightly soluble in water, soluble in ethanol and ether, flammable, and basically non-toxic. It can be produced from natural castor oil or adipic acid monoester as raw materials. Sebacic acid can also be obtained by polymerization reaction of ethylene and carbon tetrachloride. However, almost all industrially produced sebacic acid in the world currently uses castor oil as raw material.

[0003] Castor oil is heated and hydrolyzed under the action of alkali to generate sodium ricinoleate soap, and then sulfuric acid is added for acid hydrolysis to generate ricinoleic acid; in the presence of a diluent, alkali is added and heated to 260-280°C for cracking to generate disodium sebacic acid, 2-octanol and hydrogen. After the cracking product is diluted with water, it is heated and acid is added to neutralize, and the disodium salt is converted into monosodium salt; the neutralization solution decolorized with activated carbon is boiled and acid is added to convert the monosodium sebacic acid into sebacic acid crystals, and then separated and dried to obtain the finished product.

[0004] Among them, for the cracking kettle required for the process of cracking ricinoleic acid to generate disodium sebacic acid and hydrogen, since the product contains both gas and solution, the gas needs to be recycled separately after it is generated. The existing cracking kettle is equipped with a gas outlet for gas recovery. During the reaction process, the raw liquid needs to be repeatedly stirred. If the liquid or fixed substance splashes onto the gas outlet during the stirring process, the gas outlet will be blocked over time, which will affect the subsequent gas recovery and cause certain damage to the cracking kettle itself.

[0005] For example, in the cracking kettle with the authorization announcement number CN200995138Y, a gas phase outlet and a material inlet are arranged on the kettle body. The material enters the kettle body and is stirred, and the generated gas is output from the gas phase outlet. However, during the stirring process, liquid or solid can easily splash onto the gas phase outlet, which will block the gas outlet over time.

[0006] In order to solve the above technical problems, the utility model proposes a cracking kettle for preparing sebacic acid by cracking castor oil. Summary of the invention

[0007] The utility model aims to overcome the deficiencies of the prior art and proposes a cracking kettle for preparing sebacic acid by cracking castor oil, which can protect the gas outlet and avoid being blocked by non-gaseous products, thereby ensuring the smooth output of gaseous products, thereby protecting the cracking kettle and extending its service life.

[0008] In order to achieve the above objectives, the utility model proposes the following technical solutions:

[0009] A cracking kettle for preparing sebacic acid by cracking castor oil, comprising a cracking kettle body, a gas condenser, a stirring device, a first thermometer, a second thermometer, a third thermometer, a first heating device, a second heating device, a third heating device, a discharging reamer, a reamer motor, and a dissolving tank;

[0010] A gas output channel is provided above the cracking kettle body, and the gas output channel is connected to a gas condenser for condensing gas products;

[0011] A discharge port is provided at the bottom of the cracking kettle body, a discharge channel is provided at the discharge port, the discharge reamer is provided in the discharge channel, the reamer motor provides power to the discharge reamer, the discharge channel is connected to the dissolving tank, the discharge reamer transports the solid product after the reaction to the dissolving tank, and the dissolving tank dissolves the solid product to facilitate the subsequent process.

[0012] The cracking kettle body is divided into an upper kettle and a lower kettle, and the upper kettle and the lower kettle are separated by an isolation plate; the isolation plate is provided with a plurality of gas dispersion channels;

[0013] The gas dispersion channel is made of non-sticky high-temperature resistant material, and the gas dispersion channel is an angled channel with an angle of 80~120°. The inlet and outlet ends are symmetrically arranged up and down. After non-gas objects splash into the gas dispersion channel, since the inner wall of the gas dispersion channel is non-sticky and has an angle, it is difficult for non-gas objects to pass through the gas dispersion channel and enter the upper kettle, thereby avoiding non-gas objects from clogging the gas dispersion channel and ensuring normal discharge of gas products.

[0014] The first thermometer is arranged in the upper kettle to monitor the temperature in the upper kettle in real time;

[0015] A first heating layer is arranged on the inner wall of the upper kettle, and the first heating device supplies heat to the first heating layer, and the temperature in the upper kettle is adjusted in real time according to the temperature value displayed by the first thermometer;

[0016] The second thermometer and the third thermometer are arranged at the upper and lower parts of the lower kettle to respectively monitor the temperatures of the upper and lower parts of the lower kettle in real time;

[0017] A second heating layer is arranged in the upper part of the lower kettle, a third heating layer is arranged in the lower part of the lower kettle, and a heat insulation layer is arranged between the second heating layer and the third heating layer to avoid mutual influence between the second heating layer and the third heating layer, thereby facilitating layered control of the temperature in the lower kettle;

[0018] The second heat supply device supplies heat to the second heating layer, and adjusts the temperature of the upper part of the lower kettle in real time according to the temperature value displayed by the second thermometer;

[0019] The third heating device supplies heat to the third heating layer, and adjusts the temperature in the lower part of the lower kettle in real time according to the temperature value displayed by the third thermometer;

[0020] Because the cracking temperature requirement for ricinoleic acid is very high, the upper reaction temperature of the reactor body must not be lower than 240°C, otherwise 10-hydroxydecanoic acid will be generated, and the lower reaction temperature of the reactor body must not be higher than 300°C. If the lower reaction temperature is higher than 300°C, the ricinoleic acid molecules will break at the hydroxyl group between carbon 11 and 12 to generate heptanal and 11-diluted acid, which seriously affects the quality and yield of sebacic acid. The above is known to those skilled in the art.

[0021] A feed channel is provided above the cracking kettle body, an internal channel is provided at the top of the cracking kettle body, a through hole is provided on the isolation plate, the internal channel passes through the through hole of the isolation plate and communicates with the lower kettle, the through hole of the isolation plate is fixedly connected to the internal channel, and the outer edge of the isolation plate is fixedly connected to the inner wall of the cracking kettle body; the feed channel penetrates the cracking kettle body and communicates with the internal channel;

[0022] The isolation plate is arranged above the end of the internal channel, the end of the internal channel is the feed liquid inlet, and the mixed feed liquid falls from the feed liquid inlet into the lower kettle through the feed channel and the internal channel;

[0023] The internal channel is a double-layer pipeline, the inner space is a stirring rod channel, and the outer space is a liquid channel; the stirring device includes a stirring motor, a stirring rod and a stirring paddle, the stirring rod passes through the stirring rod channel and extends into the lower kettle, the stirring paddle is spirally arranged at the lower end of the stirring rod, and the stirring paddle stirs in the lower kettle;

[0024] The inner diameter of the stirring rod channel is 3 to 6 times the outer diameter of the stirring rod. The raw material liquid flows into the lower kettle through the liquid channel. The stirring rod rotates in the stirring rod channel, so that the raw material liquid has sufficient space to flow in the internal channel. At the same time, the rotation of the stirring rod will not affect the input of the raw material liquid.

[0025] Preferably, the gas dispersion channel is made of Teflon, which is also called polytetrafluoroethylene. It is a polymer compound formed by polymerization of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance, high lubricity and non-stickiness, high temperature resistance, and an operating temperature of 250°C. It is a material already available in the prior art.

[0026] Preferably, the overall height of the gas dispersion channel is greater than the thickness of the isolation plate.

[0027] Preferably, the inlet end surface of the gas dispersion channel is arranged vertically to further prevent non-gaseous objects from entering the gas dispersion channel.

[0028] Preferably, the outlet end surface of the gas dispersion channel is arranged horizontally to accelerate the gas discharge speed.

[0029] Preferably, the angle of the gas dispersion channel is 90-100°.

[0030] Preferably, a metering pump is provided on the feed channel for accurately controlling the input ratio of the raw material liquid, and the use of the metering pump is already known in the prior art.

[0031] Preferably, the feed channel is provided with a mixing disk before entering the cracking kettle body, so as to fully mix the liquid and solid raw materials, and then evenly enter the cracking kettle body after mixing. The use of the mixing disk is already known in the prior art.

[0032] Preferably, the first heat supply device includes a first heating system and a first temperature control system, the first temperature control system is connected to a first thermometer, and the first temperature control system adjusts the first heating system according to the temperature display value of the first thermometer, thereby adjusting the temperature in the upper kettle. The temperature in the upper kettle is controlled at 240-250°C, which is close to the temperature of the upper half of the lower kettle, thereby ensuring a small temperature difference and avoiding heat loss.

[0033] Preferably, the second heat supply device includes a second heating system and a second temperature control system, the second temperature control system is connected to a second thermometer, and the second temperature control system adjusts the second heating system according to the temperature display value of the second thermometer, thereby adjusting the reaction temperature of the upper part in the lower kettle, and the temperature of the upper part in the lower kettle is controlled at 240~250℃.

[0034] Preferably, the third heating device includes a third heating system and a third temperature control system, and the third temperature control system is connected to a third thermometer. The third temperature control system adjusts the third heating system according to the temperature display value of the third thermometer, thereby adjusting the reaction temperature of the lower part in the lower kettle, and the temperature of the upper part in the lower kettle is controlled at 280~290℃.

[0035] The first heating device, the second heating device and the third heating device mentioned above are existing devices in the prior art and are known to those skilled in the art.

[0036] The first heating layer, the second heating layer and the third heating layer mentioned above can be a combination of heating tubes, or can be other heating forms, which are technical means well known to those skilled in the art.

[0037] The use of the dissolving tank, discharging reamer, and reamer motor mentioned above belongs to the prior art, which is known to those skilled in the art and can be used directly.

[0038] Specifically, the first heat supply device and the first thermometer cooperate to control the temperature in the upper kettle at 240-250°C, the second heat supply device and the second thermometer cooperate to control the temperature of the upper reaction part in the lower kettle at 240-250°C, and the third heat supply device and the third thermometer cooperate to control the temperature of the lower reaction part in the lower kettle at 280-290°C.

[0039] Then, 50% of sodium hydroxide liquid alkali and oily phenol are combined into a raw material liquid in a ratio of 1:1, and enter the lower kettle through the feed channel and the liquid channel. The distance between the liquid surface of the raw material liquid entering the lower kettle and the gas dispersion channel is controlled to be 10-50 cm. At the same time, the stirring device rotates to stir the raw material liquid in the lower kettle. During the cracking reaction, the temperature in the upper kettle and the upper part of the lower kettle is always maintained at 240-250° C., and the temperature in the lower part of the lower kettle is always maintained at 280-290° C., ensuring that the cracking reactants are disodium sebacic acid and 2-octanol.

[0040] After sufficient reaction, the liquid product is transported to the dissolution tank through the discharge reamer for subsequent operation; the gas product enters the upper kettle from the lower kettle through the gas dispersion channel, and enters the gas condenser through the gas output channel for recovery.

[0041] During the reaction, if the mixed raw material liquid splashes onto the gas dispersion channel during stirring, it will fall and cannot enter the upper kettle, will not block the gas dispersion channel, and will not affect the normal output of the gas.

[0042] The beneficial effects of the utility model are:

[0043] The utility model provides an isolation plate between the upper kettle and the lower kettle, and a gas dispersion channel is provided on the isolation plate. The gas dispersion channel is made of non-sticky material, which can prevent the mixed liquid from splashing onto the gas dispersion channel during the stirring process and will not affect the normal output of the gas.

[0044] The utility model provides a gas dispersion channel with a folded angle. If the mixed liquid splashes into the gas dispersion channel during the stirring process, it will also fall due to the setting of the folded angle, thereby preventing the mixed liquid from splashing into the upper kettle, protecting the upper kettle and ensuring the normal output of gas.

[0045] The utility model provides an internal channel in the cracking kettle body and connects it with the feed channel, so that the feed channel is directly connected with the lower kettle, the raw material liquid directly enters the lower kettle, and the raw material liquid does not enter the upper kettle, so that the upper kettle is only used for gas recovery, the upper kettle is protected, and it is beneficial to the normal recovery of gas products.

[0046] The utility model controls the temperature of the upper part and the lower part of the lower kettle respectively, thereby achieving accurate control, thereby avoiding the generation of other products and avoiding affecting the output of sebacic acid.

[0047] By adopting the above scheme, the utility model can protect the gas outlet, avoid being blocked by non-gas products, ensure the smooth output of gas products, and will not affect the quality and output of sebacic acid; protect the cracking kettle and extend its service life; the side reaction is small, the yield is stable, and the yield can be greater than 53%. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0050] In the figure, 1-cracking kettle, 2-gas condenser, 3-stirring device, 4-first thermometer, 5-second thermometer, 6-second heating device, 7-first heating device, 8-third heating device, 9-third thermometer;

[0051] 11-upper kettle, 12-lower kettle, 13-gas output channel, 14-feed channel, 15-isolation plate, 16-discharge port, 17-internal channel;

[0052] 111-first heating layer, 121-second heating layer, 122-third heating layer, 123-insulating layer, 151-gas dispersion channel, 161-discharging reamer, 162-reamer motor, 163-dissolving tank, 171-stirring rod channel, 172-liquid channel; 31-stirring rod, 32-stirring paddle; Implementation

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0055] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] like Figure 1 As shown, a cracking kettle for preparing sebacic acid by cracking castor oil comprises a cracking kettle body 1, a gas condenser 2, a stirring device 3, a first thermometer 4, a second thermometer 5, a third thermometer 9, a first heating device 7, a second heating device 6, a third heating device 8, a discharge reamer 161, a reamer motor 162, and a dissolving tank 163;

[0058] A gas output channel 13 is provided above the cracking kettle body 1, and the gas output channel 13 is connected to the gas condenser 2 for condensing the gas product;

[0059] A discharge port 16 is provided at the bottom of the cracking kettle body 1, and a discharge channel is provided at the discharge port 16. The discharge reamer 161 is provided in the discharge channel, and the reamer motor 162 provides power to the discharge reamer 161. The discharge channel is connected to the dissolving tank 163. The discharge reamer 161 transports the solid product after the reaction to the dissolving tank 163, and the dissolving tank 163 dissolves the solid product to facilitate the subsequent process.

[0060] The cracking kettle body 1 is divided into an upper kettle 11 and a lower kettle 12, and the upper kettle 11 and the lower kettle 12 are separated by an isolation plate 15; a plurality of gas dispersion channels 151 are arranged on the isolation plate 15;

[0061] The gas dispersion channel 151 is made of non-sticky high temperature resistant material, such as Teflon, and the gas dispersion channel 151 is an angled channel with an angle of 80-120 degrees. The inlet and outlet ends are symmetrically arranged up and down. After non-gas objects splash into the gas dispersion channel 151, since the inner wall of the gas dispersion channel 151 is non-sticky and has an angle, it is difficult for the non-gas objects to pass through the gas dispersion channel 151 and enter the upper kettle 11, thereby preventing the non-gas objects from blocking the gas dispersion channel 151 and ensuring the normal discharge of gas products.

[0062] The first thermometer 4 is disposed in the upper kettle 11 to monitor the temperature in the upper kettle 11 in real time;

[0063] The first heating layer 111 is provided on the inner wall of the upper kettle 11, and the first heating device 7 supplies heat to the first heating layer 111, and adjusts the temperature in the upper kettle 11 in real time according to the temperature value displayed by the first thermometer 4;

[0064] The second thermometer 5 and the third thermometer 9 are arranged at the upper and lower parts of the lower kettle 12 to respectively monitor the temperatures of the upper and lower parts of the lower kettle 12 in real time;

[0065] A second heating layer 121 is disposed in the upper part of the lower kettle 12, and a third heating layer 122 is disposed in the lower part of the lower kettle 12. A heat insulating layer is disposed between the second heating layer 121 and the third heating layer 122 to avoid mutual influence between the second heating layer 121 and the third heating layer 122, thereby facilitating layered control of the temperature in the lower kettle 12.

[0066] The second heat supply device 6 supplies heat to the second heating layer 121, and adjusts the temperature in the upper part of the lower kettle 12 in real time according to the temperature value displayed by the second thermometer 5;

[0067] The third heat supply device 8 supplies heat to the third heating layer 122, and adjusts the temperature in the lower part of the lower kettle 12 in real time according to the temperature value displayed by the third thermometer 9;

[0068] A feed channel 14 is provided above the cracking kettle body 1, an internal channel 17 is provided at the top of the cracking kettle body 1, a through hole is provided in the isolation plate 15, the internal channel 17 passes through the through hole of the isolation plate 15 and communicates with the lower kettle 12, the through hole of the isolation plate 15 is fixedly connected to the internal channel 17, and the outer edge of the isolation plate 15 is fixedly connected to the inner wall of the cracking kettle body 1; the feed channel 14 penetrates the cracking kettle body 1 and communicates with the internal channel 17;

[0069] The isolation plate 15 is disposed above the end of the internal channel 17. The end of the internal channel 17 is a liquid inlet. The mixed liquid passes through the feed channel 14 and the internal channel 17 and falls from the liquid inlet into the lower kettle 12.

[0070] The inner channel 17 is a double-layer pipe, the inner space is a stirring rod channel 171, and the outer space is a liquid channel 172; the stirring device 3 includes a stirring motor, a stirring rod 31 and a stirring paddle 32, the stirring rod 31 passes through the stirring rod channel 171 and extends into the lower kettle 12, the stirring paddle 32 is spirally arranged at the lower end of the stirring rod 31, and the stirring paddle 32 stirs in the lower kettle 12;

[0071] The inner diameter of the stirring rod channel 171 is 3 to 6 times the outer diameter of the stirring rod 31. The raw material liquid flows into the lower kettle 12 through the liquid channel 172. The stirring rod 31 rotates in the stirring rod channel 171, so that the raw material liquid has sufficient space to flow in the internal channel 17. At the same time, the rotation of the stirring rod 31 will not affect the input of the raw material liquid.

[0072] The overall height of the gas dispersion channel 151 is greater than the thickness of the isolation plate 15 .

[0073] The inlet end surface of the gas dispersion channel 151 is arranged vertically.

[0074] The outlet end surface of the gas dispersion channel 151 is arranged horizontally.

[0075] The angle of the gas dispersion channel 151 is 90-100 degrees.

[0076] Specifically, the first heat supply device 7 and the first thermometer 4 cooperate to control the temperature in the upper kettle 11 at 240-250°C, the second heat supply device 6 and the second thermometer 5 cooperate to control the upper reaction temperature in the lower kettle 12 at 240-250°C, and the third heat supply device 8 and the third thermometer 9 cooperate to control the lower reaction temperature in the lower kettle 12 at 280-290°C.

[0077] Then, 50% of sodium hydroxide liquid alkali and oily phenol are combined into a raw material liquid in a ratio of 1:1, and enter the lower kettle 12 through the feed channel 14 and the liquid channel 172. The distance between the liquid surface of the raw material liquid entering the lower kettle 12 and the gas dispersion channel 151 is controlled to be 10-50 cm. At the same time, the stirring device 3 rotates to stir the raw material liquid in the lower kettle 12. During the cracking reaction, the temperature in the upper kettle 11 and the upper part of the lower kettle 12 is always maintained at 240-250° C., and the temperature in the lower part of the lower kettle 12 is always maintained at 280-290° C., ensuring that the cracking reactants are disodium sebacic acid and 2-octanol.

[0078] After sufficient reaction, the liquid product is transported to the dissolution tank 163 via the discharge reamer 161 for subsequent operation; the gas product enters the upper kettle 11 from the lower kettle 12 via the gas dispersion channel 151, and enters the gas condenser 2 through the gas output channel for recovery.

[0079] During the reaction process, if the mixed raw material liquid splashes onto the gas dispersion channel 151 during stirring, it will fall down and will not block the gas dispersion channel 151 and will not affect the normal output of the gas.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cracking kettle for preparing sebacic acid by cracking castor oil, comprising a cracking kettle body, a gas condenser, a stirring device, a discharging reamer, a reamer motor, and a dissolving tank, wherein a gas output channel is provided above the cracking kettle body, the gas output channel is connected to the gas condenser, a discharging port is provided at the bottom of the cracking kettle body, a discharging channel is provided at the discharging port, the discharging reamer is provided at the discharging channel, the reamer motor provides power to the discharging reamer, and the discharging channel is connected to the dissolving tank; the stirring device comprises a stirring motor, a stirring rod and a stirring paddle; characterized in that: The cracking kettle body is divided into an upper kettle and a lower kettle, which are separated by an isolation plate; a plurality of gas dispersion channels are arranged on the isolation plate; the gas dispersion channel is made of non-sticky high-temperature resistant material, and the gas dispersion channel is an angled channel with an angle of 80-120°, and the inlet and outlet ends are symmetrically arranged up and down; a feed channel is arranged above the cracking kettle body, an internal channel is arranged at the top of the cracking kettle body, the isolation plate is provided with a through hole, the internal channel passes through the through hole of the isolation plate and communicates with the lower kettle, the through hole of the isolation plate is fixedly connected to the internal channel, and the outer edge of the isolation plate is fixedly connected to the inner wall of the cracking kettle body; the feed channel penetrates into the cracking kettle body and communicates with the internal channel; the internal channel is a double-layer pipeline, the inner space is a stirring rod channel, and the outer space is a liquid channel; the stirring rod passes through the stirring rod channel and extends into the lower kettle, and the stirring paddle spiral is arranged at the lower end of the stirring rod; the inner diameter of the stirring rod channel is 3-6 times the outer diameter of the stirring rod.

2. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: It also includes a first thermometer, a second thermometer, a third thermometer, a first heat supply device, a second heat supply device, and a third heat supply device. The first thermometer is arranged in the upper kettle; a first heating layer is arranged on the inner wall of the upper kettle, and the first heat supply device supplies heat to the first heating layer; the second thermometer and the third thermometer are arranged in the upper and lower parts of the lower kettle; the second heating layer is arranged in the upper part of the lower kettle, and the third heating layer is arranged in the lower part of the lower kettle, and an insulating layer is arranged between the second heating layer and the third heating layer; the second heat supply device supplies heat to the second heating layer; and the third heat supply device supplies heat to the third heating layer.

3. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The gas dispersion channel is made of Teflon.

4. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The overall height of the gas dispersion channel is greater than the thickness of the isolation plate.

5. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The inlet end surface of the gas dispersion channel is arranged vertically.

6. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The outlet end surface of the gas dispersion channel is arranged horizontally.

7. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The angle of the gas dispersion channel is 90-100°.

8. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 1, characterized in that: The feed channel is provided with a metering pump; the feed channel is provided with a mixing disk before entering the cracking kettle body.

9. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 2, characterized in that: The first heat supply device includes a first heating system and a first temperature control system. The first temperature control system is connected to a first thermometer. The first temperature control system adjusts the first heating system according to a temperature display value of the first thermometer.

10. A cracking kettle for preparing sebacic acid by cracking castor oil according to claim 2, characterized in that: The second heating device includes a second heating system and a second temperature control system, the second temperature control system is connected to a second thermometer, and the second temperature control system adjusts the second heating system according to the temperature display value of the second thermometer; the third heating device includes a third heating system and a third temperature control system, the third temperature control system is connected to a third thermometer, and the third temperature control system adjusts the third heating system according to the temperature display value of the third thermometer.

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