Mixed acid stirring equipment for production of isooctyl nitrate

Abstract

The utility model relates to the technical field of isooctyl nitrate production, in particular to mixed acid stirring equipment for isooctyl nitrate production, which comprises a bottom plate and a stirring kettle, the stirring kettle consists of a kettle body arranged on the bottom plate, a kettle cover arranged on the kettle body, a stirring mechanism which is arranged on the kettle cover and acts in the kettle body, and a driving mechanism which is arranged on the kettle cover and is in transmission connection with the stirring mechanism; the stirring mechanism comprises a first stirring shaft which is rotatably connected to the kettle cover, a second stirring shaft which is vertically arranged in the first stirring shaft in a sliding manner, and a threaded adjusting sleeve which is arranged on the second stirring shaft and is matched with the first stirring shaft for use; stirring blades are arranged on the first stirring shaft and the second stirring shaft; the threaded adjusting sleeve is used for adjusting the height of the second stirring shaft in the kettle body; through the synergistic effect of the threaded adjusting sleeve and the nested stirring shaft, the immersion depth of the second stirring shaft can be adjusted, so that the turbo-type paddle can stir mixed acid systems with different viscosities.

Description

Technical Field

[0001] This utility model relates to the field of isooctyl nitrate production technology, specifically to a mixed acid stirring device for isooctyl nitrate production. Background Technology

[0002] In the production of isooctyl nitrate, the mixed acid stirring equipment needs to adapt to the dynamic adjustment requirements of different raw material viscosities and formulations. Traditional stirring devices have the following technical shortcomings:

[0003] (1) The fixed stirring shaft structure makes it inconvenient to adjust the stirring depth, and it is easy to form a mixing dead zone when processing high viscosity materials;

[0004] (2) The mixing efficiency of a single type of stirring blade is low;

[0005] (3) The equipment needs to be completely shut down and disassembled during cleaning and maintenance, which affects the continuous operation of the production line.

[0006] Especially when raw material suppliers change or process parameters are adjusted, existing equipment often needs to be shut down to replace mixing components, resulting in a loss of production efficiency. Utility Model Content

[0007] The purpose of this invention is to provide a mixed acid stirring device for the production of isooctyl nitrate, which solves the problem mentioned in the background art that existing equipment needs to be shut down to replace stirring components when raw material suppliers change or process parameters are adjusted, resulting in a loss of production efficiency.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a mixed acid stirring device for the production of isooctyl nitrate, comprising a base plate and a stirring vessel. The stirring vessel consists of a vessel body mounted on the base plate, a vessel cover mounted on the vessel body, a stirring mechanism mounted on the vessel cover and acting within the vessel body, and a drive mechanism mounted on the vessel cover and connected to the stirring mechanism. The stirring mechanism includes a first stirring shaft rotatably connected to the vessel cover, a second stirring shaft vertically slidably mounted within the first stirring shaft, and a threaded adjusting sleeve mounted on the second stirring shaft and used in conjunction with the first stirring shaft. Both the first and second stirring shafts are provided with stirring blades, and the threaded adjusting sleeve is used to adjust the height of the second stirring shaft within the vessel body.

[0009] Furthermore, the threaded adjusting sleeve is rotatably connected to the upper end of the second stirring shaft, the upper section of the first stirring shaft is a threaded section, and the inner wall of the threaded adjusting sleeve is threadedly engaged with the upper section of the first stirring shaft.

[0010] Furthermore, the driving mechanism includes a limiting slider on the lid and a motor on the limiting slider; both the first stirring shaft and the motor output shaft are provided with pulleys, and the two pulleys are connected by belt drive.

[0011] Furthermore, it also includes a lifting mechanism mounted on the base plate. The lifting mechanism includes a vertical plate mounted on the base plate and located on one side of the mixing vessel, and a cylinder. A sliding groove is provided on the vertical plate. One end of the limiting slider passes through the sliding groove and is connected to the output shaft of the cylinder. The limiting slider slides vertically with the sliding groove.

[0012] Furthermore, the vessel body has a sandwich structure, and a refrigerant pipe is provided in the spiral disc inside the vessel body sandwich, with both ends of the refrigerant pipe extending to the outside of the vessel body.

[0013] Furthermore, the impeller blades on the first stirring shaft are inclined blade impellers, and the impeller blades on the second stirring shaft are turbine blade impellers.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Adjustable dual-shaft stirring system: Through the synergistic effect of the threaded adjusting sleeve and the nested stirring shaft, the turbine impeller can be used to stir mixed acid systems of different viscosities by adjusting the immersion depth of the second stirring shaft.

[0016] 2. Synergistic effect of composite blades: The differentiated configuration of the oblique blade propeller and the turbine propeller achieves a dynamic balance between radial large circulation and local high shear, and shortens the emulsification time in the esterification reaction of nitric acid and isooctyl alcohol.

[0017] 3. Integrated temperature control: The jacketed refrigerant pipe directly covers the inner liner of the reactor, which increases the heat conduction area and improves heat exchange efficiency compared to traditional external heat exchangers.

[0018] 4. Modular lifting design: The lid is raised and lowered by a cylinder-driven lifting mechanism, allowing staff to clean it when not stirring. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the present invention;

[0020] Figure 2 This is a rear view of the present invention;

[0021] Figure 3 This is a cross-sectional view of the present invention;

[0022] Figure 4 This is a structural diagram of the stirring mechanism of this utility model;

[0023] Figure 5 This is a cross-sectional view of the stirring mechanism of this utility model.

[0024] In the picture:

[0025] 1. Base plate; 2. Vessel body; 3. Vessel cover; 4. Second stirring shaft; 5. Threaded adjusting sleeve; 6. Limiting slider; 7. Motor; 8. Pulley; 9. Vertical plate; 10. Cylinder; 11. Slide groove; 12. Refrigerant pipe; 13. First stirring shaft. Detailed Implementation

[0026] This embodiment provides a mixed acid stirring device for the production of isooctyl nitrate, such as... Figure 1-5 As shown, it includes:

[0027] 1. Base plate 1 and mixing vessel:

[0028] The base plate 1 is a steel load-bearing platform, and the mixing vessel consists of a vessel body 2 and a vessel cover 3. The vessel body 2 has a sandwich structure, with a refrigerant pipe 12 spirally wound inside the sandwich. Figure 3 The refrigerant pipe 12 extends to both ends outside the reactor and connects to the circulating refrigerant system to control the reaction temperature. The bottom of the reactor body 2 is equipped with a discharge pipe and a valve. The reactor cover 3 is equipped with a feed pipe and a valve, and the bottom of the reactor cover 3 is equipped with a sealing ring (not shown in the figure).

[0029] 2. Stirring mechanism:

[0030] First stirring shaft 13: Horizontally connected to the vessel cover 3 via bearings, allowing the first stirring shaft 13 to rotate relative to the vessel cover 3, but not to move vertically. Its lower end extends into the vessel body 2, and the shaft body is fixed with an inclined blade ( Figure 4 (This is used to generate radial flow and promote large-scale material mixing.)

[0031] The second stirring shaft 4 is nested inside the first stirring shaft 13 and can slide vertically along its axis. Specifically, the first stirring shaft 13 has a through keyway in the middle, and the second stirring shaft 4 is a splined rod. The keyway and the second stirring shaft 4 slide vertically together. A turbine-type impeller is installed at the lower end of the second stirring shaft 4 to generate high shear force and improve local mixing efficiency.

[0032] Threaded adjusting sleeve 5: It is sleeved on the upper end of the second stirring shaft 4 via a bearing, and can rotate on the upper end of the second stirring shaft 4, engaging with the threaded section of the upper section of the first stirring shaft 13. Figure 4 , Figure 5 When the threaded adjusting sleeve 5 is rotated, the second stirring shaft 4 rises and falls under the influence of the threaded side, thereby adjusting the immersion depth of the turbine impeller. A set screw is also threaded onto the threaded adjusting sleeve 5. Figure 4 (This is used for fixing after adjustment, or it can be fixed by using a pin limiter.)

[0033] 3. Drive mechanism: The motor 7 is fixed to the lid 3 by the limiting slider 6. Both the output shaft of the motor 7 and the first stirring shaft 13 are equipped with pulleys 8, and the power is transmitted by belt drive. Figure 2 ).

[0034] 4. Lifting mechanism: composed of vertical plate 9, cylinder 10 and slide 11 ( Figure 4 The limiting slider 6 is connected to the output end of the cylinder 10. Driven by the cylinder 10, it can move up and down along the slide groove 11 of the vertical plate 9 so that the lid 3 can be removed for cleaning when stirring is not required. The cylinder 10 has a self-locking function.

[0035] Working process and principle of this utility model:

[0036] When the device is in use, the output shaft of cylinder 10 retracts, causing the limit slider 6 to move downwards, which in turn causes the kettle cover 3 and the stirring mechanism on it to move downwards, pressing the opening of the kettle body 2. Then, the raw materials for producing isooctyl nitrate are fed in through the feed pipe (the number of feed pipes can be set according to the amount of different raw materials). The refrigerant pipe 12 is connected to the circulating cooling system, and the refrigerant flow rate is set according to the reaction temperature. Then, the motor 7 is started, which drives the two pulleys 8 to rotate via the belt, thereby driving the first stirring shaft 13 to rotate, which in turn drives the second stirring shaft 4 to rotate together. The mixed acid is stirred by the stirring blades provided on the first stirring shaft 13 and the second stirring shaft 4.

[0037] The viscosity of isooctanol from different raw material suppliers can vary (e.g., 50 cP vs. 80 cP), or the viscosity of the mixed acid system can change when the production formula of isooctyl nitrate is adjusted. In this case, by rotating the threaded adjusting sleeve 5, the threaded engagement between the threaded adjusting sleeve 5 and the upper section of the first stirring shaft 13 causes the second stirring shaft 4 to move vertically within the first stirring shaft 13, thus adapting to the stirring requirements of mixed acids of isooctyl nitrate with different viscosities.

[0038] This reactor can be used to produce nitrate ester products of different specifications (such as isooctyl nitrate and amyl nitrate). By rotating and adjusting the spacing of the stirring blades, it can quickly adapt to new process requirements and achieve "one reactor for multiple uses".

Claims

1. A mixed acid stirring device for the production of isooctyl nitrate, comprising a base plate (1) and a stirring vessel, wherein the stirring vessel consists of a vessel body (2) disposed on the base plate (1), a vessel cover (3) disposed on the vessel body (2), a stirring mechanism disposed on the vessel cover (3) and acting within the vessel body (2), and a drive mechanism disposed on the vessel cover (3) and connected to the stirring mechanism in a transmission manner, characterized in that, The stirring mechanism includes a first stirring shaft (13) rotatably connected to the lid (3), a second stirring shaft (4) vertically slidably disposed within the first stirring shaft (13), and a threaded adjusting sleeve (5) disposed on the second stirring shaft (4) and used in conjunction with the first stirring shaft (13); both the first stirring shaft (13) and the second stirring shaft (4) are provided with stirring blades, and the threaded adjusting sleeve (5) is used to adjust the height of the second stirring shaft (4) within the vessel body (2).

2. The mixed acid stirring device as described in claim 1, characterized in that, The threaded adjusting sleeve (5) is rotatably connected to the upper end of the second stirring shaft (4). The upper section of the first stirring shaft (13) is a threaded section, and the inner wall of the threaded adjusting sleeve (5) is threadedly engaged with the upper section of the first stirring shaft (13).

3. The mixed acid stirring device as described in claim 2, characterized in that, The driving mechanism includes a limiting slider (6) on the lid (3) and a motor (7) on the limiting slider (6); both the first stirring shaft (13) and the output shaft of the motor (7) are provided with pulleys (8), and the two pulleys (8) are connected by belt drive.

4. The mixed acid stirring device as described in claim 3, characterized in that, It also includes a lifting mechanism on the base plate (1), the lifting mechanism including a vertical plate (9) and a cylinder (10) on the base plate (1) and located on one side of the mixing tank; a sliding groove (11) is provided on the vertical plate (9), one end of the limiting slider (6) passes through the sliding groove (11) and is connected to the output shaft of the cylinder (10), and the limiting slider (6) slides vertically with the sliding groove (11).

5. The mixed acid stirring device as described in claim 1, characterized in that, The vessel body (2) has a sandwich structure. The spiral disc inside the vessel body (2) is provided with a refrigerant pipe (12), and both ends of the refrigerant pipe (12) extend to the outside of the vessel body (2).

6. The mixed acid stirring device as described in claim 2, characterized in that, The agitator blades on the first agitator shaft (13) are inclined blades, and the agitator blades on the second agitator shaft (4) are turbine blades.

Images