A cracking still heating device for producing sebacic acid

Abstract

The utility model provides a kind of cracking still heating device for producing sebacic acid, including cracking still body, jacket, fused salt furnace, fused salt ground groove, cracking still body includes upper and lower intercommunication arrangement's large kettle and small kettle, jacket includes upper section jacket and lower section jacket, upper section jacket is wrapped in large kettle outer wall side, spiral baffling bulkhead is equipped in upper section jacket, the inner edge of spiral baffling bulkhead is in abutment with large kettle outer wall, the upper end and the lower end of flow channel are equipped with first fused salt outlet and first fused salt inlet respectively, lower section jacket is wrapped in small kettle outer wall side, lower section jacket is hollowly arranged, second fused salt outlet and second fused salt inlet are respectively equipped in lower section jacket upper part and lower part, fused salt ground groove outlet is connected with first fused salt inlet and second fused salt inlet respectively via fused salt pump, fused salt furnace outlet is connected with fused salt ground groove inlet, and fused salt furnace inlet is connected with second fused salt outlet and second fused salt outlet respectively.The device can effectively control the temperature of different regions of cracking still.

Description

Technical Field

[0001] This utility model belongs to the field of sebacic acid preparation technology, and in particular relates to a cracking reactor heating device for producing sebacic acid. Background Technology

[0002] A reaction vessel is a comprehensive reaction container widely used in production users such as petroleum, chemical, and rubber industries, as well as in various scientific research projects. It is used to complete processes such as hydrolysis, neutralization, crystallization, distillation, evaporation, storage, and isothermal reactions. In the production process of sebacic acid, the pyrolysis process carried out in the reaction vessel has a significant impact on the quality and color value of the final product. The pyrolysis of sebacic acid can only be achieved in the presence of an alkali. The concentration of the alkali, the reaction temperature, and the concentration of the catalyst all directly affect the success of the pyrolysis and the quality of the final product. Since ricinoleic acid produces different products at different temperatures, temperature is a key factor in pyrolysis. To reduce by-products and improve product yield, quality, and color value, the heating device of the reaction vessel is crucial. Chinese utility model CN220835573 U discloses a reaction vessel with an integral jacket; however, the heating temperature of the vessel body is singular and cannot meet the process requirements. Moreover, the spiral guide plate has a continuous structure, making processing and assembly difficult and costly. Summary of the Invention

[0003] The technical problem solved by this invention is that existing reactors have a single heating temperature and high cost.

[0004] This utility model provides a heating device for a cracking reactor used in the production of sebacic acid, comprising a cracking reactor body, a jacket, a molten salt furnace, and a molten salt tank. The cracking reactor body includes a large reactor and a small reactor connected vertically. The jacket includes an upper jacket and a lower jacket. The upper jacket wraps around the outer wall of the large reactor, forming a cavity between the upper jacket and the large reactor. A spiral baffle is provided inside the upper jacket, with its inner edge abutting against the outer wall of the large reactor, thus dividing the cavity and forming a spirally rising flow channel. The upper and lower ends of the flow channel are respectively provided with an upper molten salt outlet and an upper molten salt inlet. The lower jacket wraps around the outer wall of the small reactor and is hollow. The upper and lower parts of the lower jacket are respectively provided with a lower molten salt outlet. The reactor body includes a large reactor and a small reactor connected vertically. The jacket includes an upper jacket and a lower jacket. The upper jacket wraps around the outer wall of the large reactor, forming a cavity between the upper jacket and the large reactor. The upper jacket is equipped with a spiral baffle, the inner edge of which abuts against the outer wall of the large reactor, thus dividing the cavity and forming a spirally rising flow channel. The upper and lower ends of the flow channel are respectively provided with a first molten salt outlet and a first molten salt inlet. The lower jacket wraps around the outer wall of the small reactor and is hollow. The upper and lower parts of the lower jacket are respectively provided with a second molten salt outlet and a second molten salt inlet. The molten salt tank outlet is connected to the first molten salt inlet and the second molten salt inlet via a molten salt pump. The molten salt furnace outlet is connected to the molten salt tank inlet via a pipeline. The molten salt furnace inlet is connected to the second molten salt outlet and the second molten salt outlet via a return pipeline.

[0005] Furthermore, the spiral baffle is composed of several inclined curved panels spliced ​​end to end, and the inner wall of the upper jacket is provided with a slot that matches the thickness of the inclined curved panel. The outer edge of the inclined curved panel cooperates with the slot to fix it on the inner wall of the upper jacket.

[0006] Furthermore, the inclined curved panel is provided with a first connecting part and a second connecting part at both ends. Both the first connecting part and the second connecting part are horizontally arranged. The front end of the first connecting part is provided with a protrusion, and the second connecting part is provided with a slot that cooperates with the protrusion. Adjacent inclined curved panels are connected through the first connecting part and the second connecting part.

[0007] Furthermore, the tilt angle of the inclined curved panel ranges from 15 to 30°.

[0008] Furthermore, the thickness of the jacket is 3-4 cm.

[0009] Furthermore, molten salt is introduced into the upper jacket through the first molten salt inlet. The molten salt temperature is 300°C. The molten salt flows to the middle and upper parts through the spiral baffle and is output from the first molten salt outlet, so that the temperature of the reactant liquid surface in the large vessel is 250±5°C.

[0010] Furthermore, molten salt is introduced into the lower jacket through the second molten salt inlet, and the molten salt temperature is 300°. After the lower jacket is filled with molten salt, it is output through the second molten salt outlet, so that the temperature inside the small vessel is 300°.

[0011] This invention offers the following advantages: The heating device effectively controls the temperature in different areas of the cracking reactor by incorporating a spiral baffle plate within the upper jacket. This achieves the ideal temperature of 300℃ for the small reactor required for the cracking reaction, while the upper part of the large reactor exhibits a gradual cooling trend, maintaining the reactant liquid level within the cracking reactor at approximately 250℃. This device effectively improves the forward propagation of the cracking reaction, significantly increases the conversion rate of raw materials, noticeably improves the yield, further reduces the fatty acid content of byproducts, and also increases the octanol content. The product's color grade can be reduced to 5 or below, reaching the industry's superior grade 1 level. Attached Figure Description

[0012] Figure 1 A schematic diagram of the heating device for the cracking reactor used in the production of sebacic acid according to this utility model.

[0013] Figure 2 A schematic diagram of the spiral baffle plate of the heating device for the cracking reactor used in the production of sebacic acid according to this utility model. Detailed Implementation

[0014] To clearly illustrate the technical features of this solution, specific embodiments are described below in conjunction with the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model.

[0015] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] like Figure 1 As shown, a cracking reactor heating device for producing sebacic acid includes a cracking reactor body 1, a jacket 2, a molten salt furnace 3, and a molten salt tank 4.

[0017] The cracking reactor body 1 includes a large reactor and a small reactor connected vertically. The jacket 2 includes an upper jacket and a lower jacket, and in this embodiment, the thickness of the jacket 2 is 3-4 cm. The upper jacket wraps around the outer wall of the large reactor, forming a cavity between the upper jacket and the large reactor. A spiral baffle is provided inside the upper jacket, and the inner edge of the spiral baffle abuts against the outer wall of the large reactor, dividing the cavity and forming a spirally rising guide channel. The upper and lower ends of the guide channel are respectively provided with a first molten salt outlet and a first molten salt inlet. The lower jacket wraps around the outer wall of the small reactor and is hollow. The upper and lower parts of the lower jacket are respectively provided with a second molten salt outlet and a second molten salt inlet. The outlet of the molten salt tank 4 is connected to the first molten salt inlet and the second molten salt inlet via a molten salt pump. The outlet of the molten salt furnace 3 is connected to the inlet of the molten salt tank 4 via a pipe. The inlet of the molten salt furnace 3 is connected to the first molten salt outlet and the second molten salt outlet via a return pipe.

[0018] like Figure 2 As shown, the spiral baffle is composed of several inclined curved panels 6 spliced ​​end to end, with the inclination angle of the inclined curved panels 6 ranging from 15° to 30°. Each end of the inclined curved panel 6 has a first connecting part 7 and a second connecting part 8, both horizontally positioned. The front end of the first connecting part 7 has a protrusion, and the second connecting part 8 has a slot that mates with the protrusion. Adjacent inclined curved panels 6 are connected through the first connecting part 7 and the second connecting part 8. The inner wall of the upper jacket has a slot matching the thickness of the inclined curved panel 6, and the outer edge of the inclined curved panel 6 mates with the slot to fix it to the inner wall of the upper jacket.

[0019] Molten salt is fed into the upper jacket through the first molten salt inlet at a temperature of 300°C. The molten salt flows through a spiral baffle towards the middle and upper parts of the reactor and exits through the first molten salt outlet, maintaining the temperature of the reactant surface in the large reactor at 250±5°C. Molten salt is fed into the lower jacket through the second molten salt inlet at a temperature of 300°C. After the lower jacket is filled with molten salt, it exits through the second molten salt outlet, maintaining the temperature of the small reactor at 300°C. This heating device effectively controls the temperature in different areas of the cracking reactor, achieving the ideal temperature of 300°C in the small reactor and a gradual cooling trend in the upper and middle parts of the large reactor, keeping the reactant surface temperature around 250°C. Since its operation, this device has effectively improved the forward progress of the cracking reaction, significantly increased the conversion rate of raw materials, noticeably improved the yield, further reduced the fatty acid content of by-products, and improved the octanol content. The product color number can be reduced to 5 or below, reaching the industry's superior grade 1 level.

[0020] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A heating device for a cracking reactor used in the production of sebacic acid, characterized in that, Includes the cracking reactor body, jacket, molten salt furnace, and molten salt tank. The cracking reactor body includes a large reactor and a small reactor connected vertically. The jacket comprises an upper jacket and a lower jacket. The upper jacket wraps around the outer wall of the large vessel, forming a cavity between the upper jacket and the large vessel. A spiral baffle is installed inside the upper jacket, with its inner edge abutting against the outer wall of the large vessel, thus dividing the cavity and forming a spirally rising flow channel. A first molten salt outlet and a first molten salt inlet are respectively located at the upper and lower ends of the flow channel. The lower jacket wraps around the outer wall of the small vessel and is hollow. A second molten salt outlet and a second molten salt inlet are respectively located at the upper and lower parts of the lower jacket. The outlet of the molten salt trough is connected to the first molten salt inlet and the second molten salt inlet via a molten salt pump, the outlet of the molten salt furnace is connected to the inlet of the molten salt trough via a pipeline, and the inlet of the molten salt furnace is connected to the second molten salt outlet and the second molten salt outlet via a return pipeline.

2. The cracking reactor heating device for producing sebacic acid according to claim 1, characterized in that, The spiral baffle is composed of several inclined curved panels spliced ​​end to end. The inner wall of the upper jacket is provided with a slot that matches the thickness of the inclined curved panel. The outer edge of the inclined curved panel cooperates with the slot to fix it on the inner wall of the upper jacket.

3. The cracking reactor heating device for producing sebacic acid according to claim 2, characterized in that, The inclined curved panel is provided with a first connecting part and a second connecting part at both ends. Both the first connecting part and the second connecting part are horizontally arranged. The front end of the first connecting part is provided with a protrusion, and the second connecting part is provided with a slot that mates with the protrusion. Adjacent inclined curved panels are connected through the first connecting part and the second connecting part.

4. The cracking reactor heating device for producing sebacic acid according to claim 2, characterized in that, The tilt angle of the inclined curved panel ranges from 15 to 30°.

5. The cracking reactor heating device for producing sebacic acid according to claim 1, characterized in that, The thickness of the jacket is 3-4 cm.

6. The cracking reactor heating apparatus for producing sebacic acid according to claim 1, characterized in that, The upper jacket is fed with molten salt through the first molten salt inlet. The molten salt temperature is 300°C. The molten salt flows to the middle and upper part through the spiral baffle and is output from the first molten salt outlet, so that the temperature of the reactant liquid surface in the large kettle is 250±5°C.

7. The cracking reactor heating device for producing sebacic acid according to claim 1, characterized in that, The lower jacket is fed with molten salt through the second molten salt inlet at a temperature of 300°C. After the lower jacket is filled with molten salt, it is discharged through the second molten salt outlet, resulting in a temperature of 300°C inside the small vessel.

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