Energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate

Abstract

The utility model relates to the technical field of chemical production and preparation, and discloses an energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate, which comprises an esterification reaction bed, a spiral steam heating pipe and a reflux spiral pipe are arranged in the esterification reaction bed, and a steam leading-in pipe and a steam leading-out pipe are respectively arranged on two sides of the esterification reaction bed. According to the utility model, the spiral steam heating pipe and the reflux spiral pipe are arranged in the esterification reaction bed, the steam leading-in pipe can lead external high-heat steam into the spiral steam heating pipe, the spiral steam heating pipe is used for high-temperature heating, the steam flows back from the steam leading-out pipe and is led into the reflux spiral pipe, the waste heat is heated, and the waste heat is refluxed and utilized; the driving motor is operated to drive the driving stirring piece to mix and stir, so that the mixing reaction effect of the reaction bed is improved, and the device has waste heat backflow utilization capability, high heat energy utilization efficiency, reduced use cost and good energy-saving and environment-friendly effects.

Description

Technical Field

[0001] This utility model relates to the field of chemical production and preparation technology, specifically to an energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate. Background Technology

[0002] The esterification bed uses solid acid catalysts (such as p-toluenesulfonic acid or modified halloysite) instead of traditional concentrated sulfuric acid. The raw materials (acetic acid and n-propanol) are preheated in a preheater before entering the fixed-bed catalyst container. The catalyst is packed into the bed, and the reaction temperature (approximately 95-102°C) is controlled by a steam regulating valve. Utilizing the esterification mechanism of "acid dehydroxylation and alcohol dehydrogenation," the reversible reaction proceeds in the forward direction, reducing byproducts. The synthesis and esterification of n-propyl acetate typically requires a large amount of hot steam for energy utilization; therefore, energy conservation and environmental protection are important aspects of this improvement.

[0003] Existing esterification beds typically require a large amount of high-temperature steam for high-temperature heating to perform esterification thermal processing during the synthesis of n-propyl acetate. However, in actual use, the existing equipment has relatively insufficient heat recovery and utilization capabilities, resulting in a significant waste of thermal energy, increased operating costs, and relatively inadequate energy conservation and environmental protection capabilities. Therefore, we propose an energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate, which has the ability to recirculate waste heat, high thermal energy utilization efficiency, reduced operating costs, and good energy-saving and environmental protection effects.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate, comprising an esterification reaction bed, wherein the interior of the esterification reaction bed is provided with a spiral steam heating pipe and a reflux spiral pipe;

[0006] The esterification reaction bed is provided with a steam inlet pipe and a steam outlet pipe on both sides, respectively. The steam inlet pipe and the steam outlet pipe are respectively connected to both ends of the spiral steam heating pipe. The end of the steam outlet pipe away from the spiral steam heating pipe is connected to the bottom end of the reflux spiral pipe. The top of the reflux spiral pipe is provided with a first exhaust pipe.

[0007] The top of the esterification reaction bed is equipped with a drive motor and a feed pipe, the inside of the esterification reaction bed is equipped with a drive stirring element, the output end of the drive stirring element is connected to the output end of the drive motor, and the bottom of the esterification reaction bed is equipped with a discharge pipe.

[0008] Preferably, a heat insulation board is attached to the top of the esterification reaction bed, and a heat-resistant oil seal is provided at the joint between the heat insulation board, the esterification reaction bed and the driving stirring component.

[0009] Preferably, the top of the esterification reaction bed is provided with an exhaust pipe, the top of the exhaust pipe is provided with a filter adsorption cylinder, and the inner side of the filter adsorption cylinder is provided with a particle adsorption plate.

[0010] Preferably, the reflux spiral tube is located inside the spiral steam heating tube, the driving agitator is located inside the reflux spiral tube, and the reflux spiral tube, the spiral steam heating tube, and the driving agitator are all on the same axis.

[0011] Preferably, the top of each of the first exhaust pipes is provided with an exhaust end, and the exhaust end is provided with a blowout preventer.

[0012] Preferably, the top of the esterification reaction bed is provided with a supporting outer frame, and the drive motor is installed and fixed on the inner side of the supporting outer frame.

[0013] Preferably, both the spiral steam heating tube and the reflux spiral tube are made of copper, and the blades and rods of the driving agitator are located inside the reflux spiral tube.

[0014] Compared with the prior art, this utility model provides an energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate, which has the following beneficial effects:

[0015] 1. This energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate features a spiral steam heating pipe and a reflux spiral pipe inside the esterification reaction bed. The steam inlet pipe introduces high-temperature steam from the outside into the spiral steam heating pipe, which heats the esterification reaction bed at a high temperature. The steam is discharged through the steam outlet pipe and then recirculated back into the reflux spiral pipe for secondary waste heat heating, demonstrating good utilization of waste heat. The steam is discharged through the first exhaust pipe, and the drive motor drives the agitator for mixing, increasing the mixing effect of the reaction bed. The feed pipe and discharge pipe respectively handle feeding and discharging, enabling the device to utilize waste heat, resulting in high thermal efficiency, reduced operating costs, and good energy-saving and environmental protection effects. Attached Figure Description

[0016] Figure 1 This is a frontal perspective three-dimensional schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a three-dimensional sectional view of the structure of this utility model.

[0018] Figure 3 This is a frontal perspective three-dimensional schematic diagram of the connection structure between the spiral steam heating pipe and the steam outlet pipe of this utility model;

[0019] Figure 4 This is a bottom-view perspective view of the connection structure between the reflux spiral tube and the steam outlet tube of this utility model.

[0020] In the diagram: 1. Esterification reaction bed; 2. Spiral steam heating pipe; 3. Reflux spiral pipe; 4. Steam outlet pipe; 5. Steam inlet pipe; 6. First exhaust pipe; 7. Support frame; 8. Drive motor; 9. Feed pipe; 10. Drive stirring component; 11. Discharge pipe; 12. Thermal insulation board; 13. Exhaust pipe; 14. Filter adsorption cylinder; 15. Exhaust end. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1-4 An energy-saving and environmentally friendly esterification bed for the synthesis of n-propyl acetate includes an esterification reaction bed 1, wherein the interior of the esterification reaction bed 1 is provided with a spiral steam heating pipe 2 and a reflux spiral pipe 3;

[0023] The two sides of the esterification reaction bed 1 are respectively provided with a steam inlet pipe 5 and a steam outlet pipe 4. The steam inlet pipe 5 and the steam outlet pipe 4 are respectively connected to the two ends of the spiral steam heating pipe 2. The end of the steam outlet pipe 4 away from the spiral steam heating pipe 2 is connected to the bottom end of the reflux spiral pipe 3. The top of the reflux spiral pipe 3 is provided with a first exhaust pipe 6.

[0024] The top of the esterification reaction bed 1 is equipped with a drive motor 8 and a feed pipe 9. The interior of the esterification reaction bed 1 is equipped with a drive stirring element 10. The output end of the drive stirring element 10 is connected to the output end of the drive motor 8. The bottom of the esterification reaction bed 1 is equipped with a discharge pipe 11.

[0025] The beneficial effects of this scheme are as follows: By installing a spiral steam heating pipe 2 and a reflux spiral pipe 3 inside the esterification reaction bed 1, the steam inlet pipe 5 can introduce high-temperature steam from the outside into the spiral steam heating pipe 2, which heats the esterification reaction bed 1 at high temperature. After the steam is discharged from the steam outlet pipe 4, it is recirculated into the reflux spiral pipe 3 for secondary waste heat heating, which has good thermal energy utilization of waste heat. The steam is discharged from the first exhaust pipe 6, and the drive motor 8 can drive the drive agitator 10 to mix and stir, which increases the mixing reaction effect of the reaction bed. The feed pipe 9 and the discharge pipe 11 perform feeding and discharging functions respectively, enabling the device to have the ability to recirculate waste heat, resulting in high thermal energy utilization efficiency, reduced operating costs, and good energy-saving and environmental protection effects.

[0026] Furthermore, a heat insulation board 12 is attached to the top of the esterification reaction bed 1, and a heat-resistant oil seal is provided at the joint between the heat insulation board 12, the esterification reaction bed 1, and the driving stirring component 10.

[0027] By setting up the heat insulation board 12, the heat in the esterification reaction bed 1 is less likely to damage the drive motor 8. The heat insulation board 12 provides good protection. The heat-resistant oil seal supports the drive stirring component 10 and has good heat resistance, making it highly practical.

[0028] Furthermore, the top of the esterification reaction bed 1 is provided with an exhaust pipe 13, the top of the exhaust pipe 13 is provided with a filter adsorption cylinder 14, and the inner side of the filter adsorption cylinder 14 is provided with a particle adsorption plate.

[0029] By setting an exhaust pipe 13 at the top of the esterification reaction bed 1, the waste gas generated after production in the esterification reaction bed 1 can be discharged. During the discharge process, the harmful substances in the waste gas can be adsorbed and filtered by the particle adsorption plate in the filter adsorption cylinder 14, which increases the environmental protection capability of the device.

[0030] Furthermore, the reflux spiral tube 3 is located inside the spiral steam heating tube 2, and the driving stirring element 10 is located inside the reflux spiral tube 3. The reflux spiral tube 3, the spiral steam heating tube 2, and the driving stirring element 10 are all on the same axis.

[0031] By setting the reflux spiral tube 3 inside the spiral steam heating tube 2, stable heat energy heating can be achieved, with high heat exchange efficiency and stable heat exchange. The reflux spiral tube 3, the spiral steam heating tube 2, and the driving stirring component 10 are all on the same axis, resulting in stable overall operation and excellent processing quality.

[0032] Furthermore, each of the first exhaust pipes 6 is provided with an exhaust end 15 at its top, and an anti-spray cap is provided on the exhaust end 15.

[0033] By setting an exhaust end 15, the waste heat steam can be discharged from the first exhaust pipe 6 and the discharge can be controlled by the exhaust end 15. Alternatively, an external pipe can be connected to the exhaust end 15 for subsequent utilization of the waste heat steam. The blowout preventer cap plays a role in preventing high-pressure steam from being ejected and causing safety hazards.

[0034] Furthermore, the top of the esterification reaction bed 1 is provided with a supporting outer frame 7, and the drive motor 8 is installed and fixed inside the supporting outer frame 7.

[0035] By setting the outer support frame 7, the drive motor 8 is supported and bears the load, and the drive motor 8 runs stably and has excellent practicality.

[0036] Furthermore, both the spiral steam heating tube 2 and the return spiral tube 3 are made of copper, and the blades and rods of the driving stirring component 10 are located inside the return spiral tube 3.

[0037] By setting both the spiral steam heating tube 2 and the return spiral tube 3 to be made of copper, the heat exchange is stable and the heat exchange efficiency is high. Furthermore, the blades and rods of the driving agitator 10 are located inside the return spiral tube 3, ensuring stable operation and convenient use.

[0038] It should be noted that all the devices in this application are common devices on the market, and can be selected according to the needs of specific use. The circuit connection relationship of each device is a simple series and parallel connection circuit. There is no innovation in the circuit connection. Those skilled in the art can easily implement it. It belongs to the prior art and will not be described in detail.

[0039] Working principle: The esterification reaction bed 1 is equipped with a spiral steam heating pipe 2 and a reflux spiral pipe 3. The steam inlet pipe 5 can introduce external high-temperature steam into the spiral steam heating pipe 2, which heats the esterification reaction bed 1 at high temperature. After the steam is discharged from the steam outlet pipe 4, it is re-introduced into the reflux spiral pipe 3 for secondary waste heat heating, which has good thermal energy utilization of waste heat. The steam thermal energy is finally discharged from the first exhaust pipe 6.

[0040] The esterification reaction bed 1 is equipped with a driving agitator 10. The driving motor 8 can drive the driving agitator 10 to mix and stir, which increases the mixing effect of the reaction bed. The feed pipe 9 and the discharge pipe 11 are used for feeding and discharging respectively. It is practical and convenient, and the device has the ability to recover waste heat. It has high thermal energy utilization efficiency, reduces the operating cost, and has good energy saving and environmental protection effects.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kind of n-propyl acetate synthesis energy-saving and environment-friendly esterification bed, including esterification reaction bed (1), it is characterized in that: The inside of the esterification reaction bed (1) is provided with a spiral steam heating pipe (2) and a reflux spiral pipe (3); The two sides of the esterification reaction bed (1) are respectively provided with a steam inlet pipe (5) and a steam outlet pipe (4), the steam inlet pipe (5) and the steam outlet pipe (4) are respectively connected with the two ends of the spiral steam heating pipe (2), the end of the steam outlet pipe (4) away from the spiral steam heating pipe (2) is connected with the bottom end of the reflux spiral pipe (3), and the top of the reflux spiral pipe (3) is provided with a first exhaust pipe (6); The top of the esterification reaction bed (1) is provided with a driving motor (8) and a feeding pipe (9), the inside of the esterification reaction bed (1) is provided with a driving stirring part (10), the output end of the driving stirring part (10) is connected with the output end of the driving motor (8), and the bottom of the esterification reaction bed (1) is provided with a discharging pipe (11).

2. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The top of the esterification reaction bed (1) is attached with a heat preservation and insulation plate (12), the joint between the heat preservation and insulation plate (12), the esterification reaction bed (1) and the driving stirring part (10) is provided with a heat-resistant oil seal.

3. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The top of the esterification reaction bed (1) is provided with a waste gas exhaust pipe (13), the top of the waste gas exhaust pipe (13) is provided with a filter adsorption cylinder (14), and the inside of the filter adsorption cylinder (14) is provided with a particle adsorption plate.

4. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The reflux spiral pipe (3) is located inside the spiral steam heating pipe (2), the driving stirring part (10) is located inside the reflux spiral pipe (3), and the reflux spiral pipe (3), the spiral steam heating pipe (2) and the driving stirring part (10) are located at the same axis.

5. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The top end of the first exhaust pipe (6) is provided with an exhaust end (15), and the exhaust end (15) is provided with a blowout cap.

6. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The top of the esterification reaction bed (1) is provided with a supporting outer frame (7), and the driving motor (8) is fixedly installed on the inside of the supporting outer frame (7).

7. The energy-saving and environment-friendly esterification bed for synthesizing n-propyl acetate according to claim 1, characterized in that: The spiral steam heating pipe (2) and the reflux spiral pipe (3) are both copper pipes, and the blades and the rod body of the driving stirring part (10) are located inside the reflux spiral pipe (3).

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