A new chlorination reaction device for chlorinated paraffin

Abstract

The utility model discloses a novel chlorinated paraffin chlorination reaction device, include: reaction kettle, the reaction kettle outside is equipped with the jacket, is equipped with the sectional heating coil pipe in the jacket, is equipped with double -layer coating in the reaction kettle inside, is equipped with the chlorine gas inlet on the reaction kettle bottom, is equipped with the first air inlet channel on chlorine gas inlet upside, is equipped with the annular distribution ring around the first air inlet channel, the annular distribution ring is connected with the first air inlet channel through a plurality of second air inlet channels, and the surface of second air inlet channel and annular distribution ring is equipped with the gas outlet micropore that evenly is equipped with interval, is equipped with the stirring device in the reaction kettle, and the stirring device includes the stirring shaft that sets up in the middle part of reaction kettle, is equipped with double -layer stirring paddle on the stirring shaft, and double -layer stirring paddle includes first stirring vane and second stirring vane. The utility model discloses through the staggered inclination design of double -layer stirring paddle enhances the turbulent mixing of material and chlorine, cooperates annular distribution ring and multi -pass inlet structure, makes chlorine dispersion more evenly, accelerates mass transfer rate.

Description

Technical Field

[0001] This utility model belongs to the field of chlorination reaction apparatus, specifically, it relates to a novel chlorination reaction apparatus for chlorinated paraffin. Background Technology

[0002] Chlorinated paraffin, as an important plasticizer and flame retardant, is widely used in the plastics and rubber industries. In existing production processes, chlorination reactors commonly suffer from uneven mixing of chlorine and paraffin, and localized temperature runaway, resulting in reaction cycles as long as 8-12 hours and a product qualification rate of only 75%-85%. Furthermore, the strong corrosiveness of chlorine makes the reactor prone to leakage, and traditional single-layer coatings or simple stirring structures are insufficient to balance corrosion resistance and reaction efficiency. In addition, insufficient temperature uniformity in the heating system can generate toxic byproducts such as polychlorinated biphenyls (PCBs), failing to meet environmental protection requirements. Therefore, there is an urgent need for equipment structural innovation to improve reaction efficiency and safety. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a novel chlorinated paraffin chlorination reaction device to solve the problems of uneven chlorine distribution leading to local over-reaction or incomplete reaction in traditional devices; large temperature fluctuations in the reaction system causing increased by-products and low product purity; insufficient stirring efficiency resulting in long reaction cycle and high energy consumption; and chlorine corrosion and short equipment life under high temperature conditions.

[0004] To solve the above-mentioned technical problems, this utility model discloses a novel chlorination reaction device for paraffin, comprising: a reaction vessel, a jacket on the outside of the reaction vessel, a segmented heating coil inside the jacket, a double-layer coating on the inside of the reaction vessel, the double-layer coating including a polytetrafluoroethylene coating on the inside and outside of the reaction vessel, a ceramic fiber layer on the outside of the polytetrafluoroethylene coating, a chlorine gas inlet at the bottom of the reaction vessel, a first gas inlet channel above the chlorine gas inlet, an annular distribution ring around the first gas inlet channel, the annular distribution ring being connected to the first gas inlet channel through several second gas inlet channels, the second gas inlet channels and the annular distribution ring having evenly spaced micro-holes for gas outlet on their surfaces, and a stirring device inside the reaction vessel, the stirring device including a stirring shaft in the middle of the reaction vessel, a double-layer stirring blade on the stirring shaft, the double-layer stirring blade including a first stirring blade inclined upward at the lower part of the stirring shaft and a second stirring blade inclined downward at the upper part of the stirring shaft, the upward inclination angle of the first stirring blade being the same as the downward inclination angle of the second stirring blade, the angle range being 30-45°.

[0005] According to one embodiment of the present invention, the above-mentioned reactor is provided with a feed inlet at the top and a discharge outlet at the bottom.

[0006] According to one embodiment of the present invention, the ceramic fiber layer and the polytetrafluoroethylene coating have the same thickness, which is 3-5 mm.

[0007] According to one embodiment of the present invention, the segmented heating coil includes an upper heating coil, a middle heating coil, and a lower heating coil.

[0008] According to one embodiment of the present invention, the number of the first stirring blade and the second stirring blade are both 3-6 pieces, and the first stirring blade and the second stirring blade are staggered in the vertical direction. The length of the first stirring blade and the second stirring blade are both 0.3-0.5 times the inner diameter of the reaction vessel.

[0009] Compared with the prior art, the present invention can achieve the following technical effects: 1) It adopts a composite structure of polytetrafluoroethylene inner layer + ceramic fiber outer layer, which takes into account both corrosion resistance and thermal conductivity, and is more suitable for chlorination reaction environment compared with traditional single coating. 2) By combining the first air intake channel with the annular distribution ring and the microporous design of the second air intake channel, chlorine gas can be uniformly diffused in a stepwise manner from the center to the edge, thus overcoming the problem of excessively high local concentration in traditional single-inlet air intake. 3) A three-dimensional mixing flow field is formed by double-layered staggered stirring blades with an inclination angle of 30-45°, which solves the problem of uneven mixing of materials in the upper and lower parts of the traditional stirring paddle.

[0010] Of course, any product implementing this utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a novel chlorinated paraffin chlorination reaction apparatus according to an embodiment of this utility model.

[0012] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified view of a portion of the ring-shaped distribution ring.

[0013] Attached Figure Labels

[0014] Reactor 10, feed inlet 11, discharge outlet 12, gas outlet 13, jacket 20, segmented heating coil 30, double-layer coating 40, polytetrafluoroethylene coating 41, ceramic fiber layer 42, chlorine gas inlet 50, first gas inlet channel 51, annular distribution ring 60, second gas inlet channel 61, gas outlet micropore 62, stirring device 70, stirring shaft 71, double-layer stirring paddle 80, first stirring blade 81, second stirring blade 82. Detailed Implementation

[0015] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0016] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a novel chlorinated paraffin chlorination reaction apparatus according to an embodiment of this utility model. Figure 2 This is an embodiment of the present utility model. Figure 1 A partially enlarged view of the annular distribution ring. As shown in the figure, a novel chlorinated paraffin chlorination reaction apparatus includes: a reaction vessel 10, a jacket 20 on the outside of the reaction vessel 10, a segmented heating coil 30 inside the jacket 20, and a double-layer coating 40 on the inside of the reaction vessel 10. The double-layer coating 40 includes a polytetrafluoroethylene coating 41 disposed on both the inside and outside of the reaction vessel 10, and a ceramic fiber layer 42 disposed on the outside of the polytetrafluoroethylene coating 41.

[0017] In one embodiment of this utility model, the reactor 10 is provided with a feed inlet 11 at the top and a discharge outlet 12 at the bottom for easy material entry and exit. A vent 13 is also provided at the top of the reactor to facilitate the discharge of reaction gases. Secondly, a jacket 20 is provided on the outside of the reactor 10, and a segmented heating coil 30 is provided inside the jacket 20. The segmented heating coil 30 includes an upper heating coil, a middle heating coil, and a lower heating coil. Gradient temperature control in different areas of the reactor 10 is achieved through the segmented heating coil 30. Finally, a double-layer coating 40 is provided on the inside of the reactor 10. The double-layer coating 40 includes a polytetrafluoroethylene (PTFE) coating 41 on both the inside and outside of the reactor 10, and a ceramic fiber layer 42 on the outside of the PTFE coating 41. The ceramic fiber layer 42 and the PTFE coating 41 have the same thickness, 3-5 mm. The inner PTFE coating 41 is corrosion-resistant, while the outer ceramic fiber layer 42 enhances thermal conductivity and structural stability, extending the service life of the equipment.

[0018] Furthermore, the bottom of the reactor 10 is provided with a chlorine gas inlet 50, and a first gas inlet channel 51 is provided on the upper side of the chlorine gas inlet 50. An annular distribution ring 60 is provided around the first gas inlet channel 51. The annular distribution ring 60 is connected to the first gas inlet channel 51 through several second gas inlet channels 61. The surfaces of the second gas inlet channels 61 and the annular distribution ring 60 are provided with evenly spaced gas outlet micropores 62.

[0019] In detail, a chlorine gas inlet 50 is provided at the bottom of the reactor 10. A first gas inlet channel 51 is provided on the upper side of the chlorine gas inlet 50 to facilitate the entry of chlorine gas. Secondly, an annular distribution ring 60 is provided around the first gas inlet channel 51. The inner diameter of the annular gas distributor is 0.6-0.8 times the inner diameter of the reactor 10. The annular distribution ring 60 is connected to the first gas inlet channel 51 through several second gas inlet channels 61. The second gas inlet channels 61 and the annular distribution ring 60 are provided with evenly spaced gas outlet micropores 62 on their surfaces. The diameter of the gas outlet micropores 62 is 1-3 mm, and the distribution density of the gas outlet micropores 62 is 500-800 per square meter. Through the combination of the first gas inlet channel 51, the annular distribution ring 60, and the micropore design of the second gas inlet channels 61, a step-like uniform diffusion of chlorine gas from the center to the edge is achieved, overcoming the problem of excessively high local concentration in traditional single-inlet gas inlets. Finally, a shut-off valve is provided on the chlorine gas inlet 50 to prevent backflow of reactants.

[0020] Preferably, the reactor 10 is provided with a stirring device 70. The stirring device 70 includes a stirring shaft 71 located in the middle of the reactor 10. The stirring shaft 71 is provided with a double-layer stirring blade 80. The double-layer stirring blade 80 includes a first stirring blade 81 located at the lower part of the stirring shaft 71 and inclined upward, and a second stirring blade 82 located at the upper part of the stirring shaft 71 and inclined downward. The upward inclination angle of the first stirring blade 81 is the same as the downward inclination angle of the second stirring blade 82, and the angle range is 30-45°.

[0021] In detail, the reactor 10 is equipped with a stirring device 70, which includes a stirring shaft 71 located in the middle of the reactor 10. The stirring shaft 71 is driven by a motor to control the stirring rate, which is adjusted according to the requirements of the reactants. Furthermore, the stirring shaft 71 is equipped with a double-layered stirring paddle 80. The double-layered stirring paddle 80 includes a first stirring blade 81 located at the lower part of the stirring shaft 71 and inclined upwards, and a second stirring blade 82 located at the upper part of the stirring shaft 71 and inclined downwards. There are 3-6 first stirring blades and 6 second stirring blades 82. The upward inclination angle of the first stirring blade 81 is the same as the downward inclination angle of the second stirring blade 82, ranging from 30° to 45°. The first stirring blades 81 and 82 are staggered in the vertical direction. The length of both the first stirring blade 81 and the second stirring blade 82 is 0.3-0.5 times the inner diameter of the reactor 10. The three-dimensional mixing flow field is formed by double-layered staggered stirring blades with an inclination angle of 30-45°, which solves the problem of uneven mixing of materials in the upper and lower parts of the traditional stirring paddle and accelerates the mass transfer rate.

[0022] In summary, this invention adopts a composite structure of "polytetrafluoroethylene inner layer + ceramic fiber outer layer", which balances corrosion resistance and thermal conductivity, and is more suitable for chlorination reaction environments compared with traditional single coatings. Through the microporous design of the first air inlet channel 51, the annular distribution ring 60, and the second air inlet channel 61, a step-like uniform diffusion of chlorine gas from the center to the edge is achieved, overcoming the problem of excessively high local concentration in traditional single-inlet air intake. The three-dimensional mixing flow field is formed by the double-layered staggered stirring blades with a 30-45° tilt angle, solving the problem of uneven mixing of materials in the upper and lower parts of the traditional stirring paddle.

[0023] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A novel chlorination reaction apparatus for chlorinated paraffin, characterized in that, include: The reactor includes a jacket on its outer side, a segmented heating coil inside the jacket, and a double-layer coating on its inner side. The double-layer coating consists of a polytetrafluoroethylene (PTFE) coating on both the inner and outer sides of the reactor, and a ceramic fiber layer on the outer side of the PTFE coating. A chlorine gas inlet is located at the bottom of the reactor, and a first inlet channel is located above the chlorine gas inlet. An annular distribution ring surrounds the first inlet channel, and the annular distribution ring is connected to the first inlet channel via several second inlet channels. The surfaces of the second inlet channels and the annular distribution ring are provided with evenly spaced micro-outlets. A stirring device is installed inside the reactor, including a stirring shaft located in the middle of the reactor. The stirring shaft has a double-layer stirring paddle, which includes a first stirring blade located below the stirring shaft and inclined upwards, and a second stirring blade located above the stirring shaft and inclined downwards. The upward inclination angle of the first stirring blade is the same as the downward inclination angle of the second stirring blade, and the angle range is 30-45°.

2. The novel chlorinated paraffin chlorination reaction apparatus according to claim 1, characterized in that, The reactor has a feed inlet at the top and a discharge outlet at the bottom.

3. The novel chlorinated paraffin chlorination reaction apparatus according to claim 1, characterized in that, The ceramic fiber layer and the polytetrafluoroethylene coating have the same thickness, which is 3-5 mm.

4. The novel chlorinated paraffin chlorination reaction apparatus according to claim 1, characterized in that, The segmented heating coil includes an upper heating coil, a middle heating coil, and a lower heating coil.

5. The novel chlorinated paraffin chlorination reaction apparatus according to claim 1, characterized in that... The number of the first stirring blade and the second stirring blade is 3-6, and the first stirring blade and the second stirring blade are staggered in the vertical direction. The length of the first stirring blade and the second stirring blade is 0.3-0.5 times the inner diameter of the reactor.

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