Polymerization cyclodextrin reaction device

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a polymerized cyclodextrin reaction device which comprises a kettle body, a driving device, a stirring shaft and a stirring assembly, the upper end of the stirring shaft is connected with the driving device, and the stirring assembly comprises an upper stirring arm and a lower stirring arm which are arranged in parallel up and down. The upper stirring arm comprises an upper front extension arm and an upper rear extension arm which horizontally extend from the stirring shaft to two sides, the lower stirring arm comprises a lower rear extension arm and a lower front extension arm which horizontally extend from the stirring shaft to two sides, and a group of connecting vertical rods are fixedly arranged between the upper front extension arm and the lower rear extension arm and between the upper rear extension arm and the lower front extension arm respectively. The device can keep the structure stable under the working conditions of high viscosity and high torque, avoids the deformation and connection failure of the stirring arm, eliminates the dead zone at the bottom of the reaction kettle, and improves the reaction uniformity.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a polymeric cyclodextrin reaction device. Background Technology

[0002] The synthesis of polymeric cyclodextrins is a typical polymerization process, in which the reaction system usually transitions from a low-viscosity homogeneous state to a high-viscosity heterogeneous state. During the mixing process of polymeric cyclodextrins, the flow field in conventional reactors often forms a difficult-to-eliminate flow dead zone at the bottom of the vessel. Within this dead zone, the material flow is extremely poor, preventing sufficient contact between the reactants, catalysts, and the bulk cyclodextrin, resulting in incomplete or even halted polymerization in certain areas. To improve mixing, existing technologies often employ multi-layered dispersive stirring arms or complex impeller structures on the stirring shaft. However, as the polymerization reaction proceeds, the material viscosity increases sharply, and the fluid resistance torque on the stirrer increases non-linearly. Under continuous high torque and alternating loads, multi-layered dispersive stirring arms are prone to plastic deformation, loosening of connections, or overall misalignment. This structural instability not only deteriorates the mixing effect but also intensifies vibrations throughout the entire stirring system, ultimately shortening equipment lifespan, increasing maintenance costs, and seriously threatening production safety and continuous operation.

[0003] Chinese patent CN216440626U discloses a novel reaction vessel for the preparation of methylcyclodextrin, comprising a base plate, a reaction vessel, support legs, a feed inlet, a discharge pipe, and a first control valve. The reaction vessel is fixedly mounted on the upper surface of the base plate via the support legs. The reaction vessel has an internal reaction chamber, a feed inlet on its upper surface, and a discharge pipe on its side surface. It also includes a spiral tube, a first fixing seat, a first water pump, a support seat, a second water pump, a drain pipe, and a water storage tank. A temperature control chamber is located in the lower part of the working chamber of the base plate. The spiral tube is placed inside the temperature control chamber, with both its input and output ends passing through the bottom surface of the temperature control chamber. It is fixedly mounted on the support legs via multiple sets of first fixing seats. This patent allows the internal temperature of the device to be maintained at room temperature, enabling stirring of the reactants, ensuring a thorough and rapid reaction, improving the reliability of the device, and allowing for cleaning of the inner wall of the working chamber, thus improving the operability of the device. However, the stirring component of this patent adopts a hollow thin-walled tube structure. When the viscosity of the material increases significantly in the later stage of the polymerization reaction, the continuous high torque and alternating load can easily cause the cantilever stirring tube to bend, deform, vibrate abnormally, or even break. In addition, there is stress concentration at the connection between the stirring tube and the rotating tube, which can easily lead to cracking under long-term operation, affecting the structural reliability and service life of the equipment. Utility Model Content

[0004] The purpose of this invention is to provide a polymer cyclodextrin reaction device that can maintain structural stability under high viscosity and high torque conditions, avoid deformation of the stirring arm and connection failure, and significantly improve the material flow state in the reactor, eliminate the bottom dead zone, thereby improving reaction uniformity and raw material utilization.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A polymeric cyclodextrin reaction apparatus includes a vessel body, a drive unit, a stirring shaft, and a stirring assembly. The stirring shaft is vertically arranged along the central axis of the vessel body, and its upper end is connected to the drive unit. The stirring assembly includes an upper stirring arm and a lower stirring arm arranged parallel to each other. Both the upper and lower stirring arms are vertically and fixedly connected to the stirring shaft. The upper stirring arm includes an upper front extension arm and an upper rear extension arm extending horizontally from both sides of the stirring shaft. The bottom of the upper front extension arm and the bottom of the upper rear extension arm extend in opposite circumferential directions in the horizontal plane. The lower stirring arm includes a lower rear extension arm and a lower front extension arm extending horizontally from both sides of the stirring shaft. The extension direction of the bottom of the lower rear extension arm is opposite to the extension direction of the bottom of the upper front extension arm, and the extension direction of the bottom of the lower front extension arm is opposite to the extension direction of the bottom of the upper rear extension arm. A set of connecting vertical rods is fixedly arranged between the upper front extension arm and the lower rear extension arm, and between the upper rear extension arm and the lower front extension arm.

[0007] Furthermore, the ends of both sets of connecting vertical rods are provided with arc-shaped bends that curve along the inner wall of the vessel, with a gap of 3-10 cm between the arc-shaped bends and the inner wall of the vessel.

[0008] Furthermore, a temperature sensing rod is installed inside the vessel, extending downwards in a vertical direction.

[0009] Furthermore, the temperature sensing rod is fixedly connected to the inner wall of the vessel via a V-shaped bracket.

[0010] Furthermore, the upper front extension arm, upper rear extension arm, lower front extension arm, and lower rear extension arm are all fixedly connected to the stirring shaft via bushings.

[0011] Furthermore, the bushing of the upper front extension arm and the bushing of the upper rear extension arm are integrally formed.

[0012] Furthermore, the bushings of the lower front extension arm and the lower rear extension arm are integrally formed.

[0013] Furthermore, a manhole is provided at the top of the vessel, and a ladder is installed inside the vessel.

[0014] Furthermore, several ear-type supports are symmetrically fixed in the middle of the vessel body along the circumferential direction.

[0015] Furthermore, the drive unit is connected to the stirring shaft via a reducer.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention employs a spatially staggered and symmetrical arrangement of the upper front extension arm and the upper rear extension arm, as well as the lower rear extension arm and the lower front extension arm. Connecting vertical rods are installed between the upper front extension arm and the lower rear extension arm, and between the upper rear extension arm and the lower front extension arm, respectively. This creates a stable, three-dimensional rigid frame comprised of the upper and lower stirring arms, the connecting vertical rods, and the stirring shaft. When the stirring shaft rotates, this rigid frame effectively resists the high torque and alternating loads generated by the high viscosity of the material in the later stages of the polymerization reaction. This fundamentally prevents plastic deformation, loosening of connections, or overall misalignment of the upper and lower stirring arms, significantly improving the equipment's operational stability, safety, and service life under harsh conditions. Simultaneously, the upper and lower stirring arms work together to create a strong sweeping and circulating flow field at the bottom of the reactor, improving the reaction rate, raw material conversion rate, and batch consistency of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial structural cross-sectional view of the vessel body, stirring shaft, upper stirring arm, lower stirring arm, connecting vertical rod, and temperature sensing rod of this utility model.

[0020] Figure 3 This is a partial structural diagram of the stirring shaft, upper stirring arm, lower stirring arm, and connecting vertical rod in this utility model. Figure 1 ;

[0021] Figure 4 This is a partial structural diagram of the stirring shaft, upper stirring arm, lower stirring arm, and connecting vertical rod in this utility model. Figure 2 ;

[0022] In the picture:

[0023] 1. Vessel body; 2. Drive unit; 3. Stirring shaft; 4. Upper stirring arm; 401. Upper front extension arm; 402. Upper rear extension arm; 5. Lower stirring arm; 501. Lower rear extension arm; 502. Lower front extension arm; 6. Connecting vertical rod; 7. Temperature sensing rod. Detailed Implementation

[0024] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0025] Example 1

[0026] like Figure 1-4As shown, the polymeric cyclodextrin reaction apparatus includes a vessel body 1, a drive device 2, a stirring shaft 3, and a stirring assembly. The stirring shaft 3 is vertically arranged along the central axis of the vessel body 1, and its upper end is connected to the drive device 2. The stirring assembly includes an upper stirring arm 4 and a lower stirring arm 5 arranged parallel to each other. Both the upper stirring arm 4 and the lower stirring arm 5 are vertically and fixedly connected to the stirring shaft 3. The upper stirring arm 4 includes an upper front extension arm 401 and an upper rear extension arm 402 extending horizontally from the stirring shaft 3 to both sides. The bottom of the upper front extension arm 401 and the bottom of the upper rear extension arm 402 are connected. The lower stirring arm 5 extends in opposite circumferential directions in the horizontal plane. It includes a lower rear extension arm 501 and a lower front extension arm 502 extending horizontally from the stirring shaft 3 to both sides. The extension direction of the bottom of the lower rear extension arm 501 is opposite to the extension direction of the bottom of the upper front extension arm 401, and the extension direction of the bottom of the lower front extension arm 502 is opposite to the extension direction of the bottom of the upper rear extension arm 402. A set of connecting vertical rods 6 are fixedly provided between the upper front extension arm 401 and the lower rear extension arm 501, and between the upper rear extension arm 402 and the lower front extension arm 502.

[0027] Both sets of connecting vertical rods 6 have arc-shaped curved parts at their ends that bend along the inner wall of the vessel body 1, and the gap between the arc-shaped curved parts and the inner wall of the vessel body 1 is 3-10 cm.

[0028] A temperature sensing rod 7 is installed inside the vessel body 1, and the temperature sensing rod 7 extends downward in the vertical direction.

[0029] The temperature sensing rod 7 is fixedly connected to the inner wall of the vessel body 1 via a V-shaped bracket.

[0030] The upper front extension arm 401, the upper rear extension arm 402, the lower front extension arm 502, and the lower rear extension arm 501 are all fixedly connected to the stirring shaft 3 via bushings.

[0031] The bushing of the upper front extension arm 401 and the bushing of the upper rear extension arm 402 are integrally formed.

[0032] The bushings of the lower front extension arm 502 and the lower rear extension arm 501 are integrally formed.

[0033] A manhole is provided on the top of the vessel body 1, and a ladder is provided inside the vessel body 1.

[0034] Several ear-type supports are symmetrically fixed in the middle of the vessel body 1 along the circumferential direction.

[0035] The drive unit 2 is connected to the stirring shaft 3 via a reducer.

[0036] Working process and principle:

[0037] The prepared cyclodextrin monomers, catalysts, and other reactants are pumped into the reactor body 1. After feeding, the drive unit 2 is activated, which drives the stirring shaft 3 to rotate. Driven by the stirring shaft 3, the three-dimensional rigid frame consisting of the upper stirring arm 4, the lower stirring arm 5, and the connecting vertical rod 6 begins to operate. The symmetrical arrangement of the upper front extension arm 401 and the lower rear extension arm 501, and the upper rear extension arm 402 and the lower front extension arm 502, combined with the axial connection of the connecting vertical rod 6, forms a strong and dead-angle-free three-dimensional turbulent flow field within the reactor body 1. This completely eliminates the flow dead zone at the bottom of the reactor body 1, ensuring uniform dispersion and contact between the catalyst and the cyclodextrin monomers, thereby guaranteeing efficient and homogeneous polymerization. In high-viscosity material environments, the upper stirring arm 4 and the lower stirring arm 5 can withstand significant fluid resistance and alternating loads, maintaining stable operation of the stirring system.

Claims

1. A polymeric cyclodextrin reaction apparatus, comprising a vessel body (1), a drive device (2), a stirring shaft (3), and a stirring assembly, wherein the stirring shaft (3) is vertically arranged along the central axis of the vessel body (1), and the upper end of the stirring shaft (3) is connected to the drive device (2), characterized in that, The stirring assembly includes an upper stirring arm (4) and a lower stirring arm (5) arranged parallel to each other. Both the upper stirring arm (4) and the lower stirring arm (5) are vertically fixed to the stirring shaft (3). The upper stirring arm (4) includes an upper front extension arm (401) and an upper rear extension arm (402) extending horizontally from the stirring shaft (3) to both sides. The bottom of the upper front extension arm (401) and the bottom of the upper rear extension arm (402) extend in opposite circumferential directions in the horizontal plane. The lower stirring arm (5) includes a water... The lower rear extension arm (501) and the lower front extension arm (502) extend horizontally. The extension direction of the bottom of the lower rear extension arm (501) is opposite to the extension direction of the bottom of the upper front extension arm (401), and the extension direction of the bottom of the lower front extension arm (502) is opposite to the extension direction of the bottom of the upper rear extension arm (402). A set of connecting vertical rods (6) are fixedly provided between the upper front extension arm (401) and the lower rear extension arm (501), and between the upper rear extension arm (402) and the lower front extension arm (502).

2. The polymeric cyclodextrin reaction apparatus according to claim 1, characterized in that, The ends of both sets of connecting vertical rods (6) are provided with arc-shaped curved parts that bend along the inner wall of the vessel body (1), and the gap between the arc-shaped curved parts and the inner wall of the vessel body (1) is 3-10 cm.

3. The polymeric cyclodextrin reaction apparatus according to claim 1, characterized in that, A temperature sensing rod (7) is installed inside the vessel body (1), and the temperature sensing rod (7) extends downward in the vertical direction.

4. The polymeric cyclodextrin reaction apparatus according to claim 3, characterized in that, The temperature sensing rod (7) is fixedly connected to the inner wall of the vessel body (1) through a V-shaped bracket.

5. The polymeric cyclodextrin reaction apparatus according to claim 1, characterized in that, The upper front extension arm (401), upper rear extension arm (402), lower front extension arm (502) and lower rear extension arm (501) are all fixedly connected to the stirring shaft (3) through bushings.

6. The polymeric cyclodextrin reaction apparatus according to claim 5, characterized in that, The bushing of the upper front extension arm (401) and the bushing of the upper rear extension arm (402) are integrally formed.

7. The polymeric cyclodextrin reaction apparatus according to claim 5, characterized in that, The bushings of the lower front extension arm (502) and the lower rear extension arm (501) are integrally formed.

8. The polymeric cyclodextrin reaction apparatus according to claim 1, characterized in that, The top of the vessel body (1) is provided with a manhole, and a ladder is provided inside the vessel body (1).

9. The apparatus for polymerizing cyclodextrin according to claim 1, characterized in that, Several ear-type supports are symmetrically fixed in the middle of the vessel body (1) along the circumferential direction.

10. The polymeric cyclodextrin reaction apparatus according to claim 1, characterized in that, The drive unit (2) is connected to the stirring shaft (3) via a reducer.

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