Efficient mixer for difluoroethane and chlorine

Abstract

The utility model relates to the technical field of mixing of difluoromonochloroethane, in particular to an efficient mixer for difluoroethane and chlorine, which comprises a tank body, the top of the tank body is fixedly connected with a tank cover through bolts and nuts, a stirring mechanism is mounted on the surface of the tank body, and feeding mechanisms are mounted on two sides of the top of the tank cover. The feeding mode of liquid chlorine and difluoroethane is changed and controlled through the feeding pipe, the spiral pipe and the Venturi ejector, the effective time of reaction is controlled by controlling the effective mixing of the liquid chlorine and the difluoroethane, so that the selectivity of the product difluoromonochloroethane is improved, the multiple turning baffle plates I are arranged in the feeding pipe, the enhancement effect is enhanced, and the production efficiency is improved. A spiral reducer pipe is adopted at an inlet of the mixer, a Venturi jet orifice is adopted at an outlet of the mixer, and multiple turning baffle plates II are additionally arranged in the mixer, so that the mixing effect is further enhanced, and two material molecules are distributed in a crossed manner and are uniformly distributed to each reaction tower.

Description

Technical Field

[0001] The utility model relates to the technical field of difluoroethane mixing technology, in particular to a high-efficiency mixer for difluoroethane and chlorine gas. Background Technique

[0002] The quality and production capacity of vinylidene fluoride are particularly important in the production of polyvinylidene fluoride. During the production process of vinylidene fluoride (PVDF), the selectivity and purity of the monomer difluoroethyl chloride have a crucial impact on the cost and quality of PVDF. Low monomer selectivity affects the production cost of PVDF; low purity affects the product quality of PVDF. In the current production process of difluoroethyl chloride, the selectivity of the monomer difluoroethyl chloride is 94%, and the product purity is 99.95%. There is still a certain gap compared with the advanced level, and there is room for improvement. A mixer is required during the production of vinylidene fluoride.

[0003] Through research and analysis, it is found that the mixers for difluoroethane and chlorine gas on the market still have the following disadvantages to a certain extent.

[0004] For example, difluoroethyl chloride is prepared by the reaction of difluoroethane and liquid chlorine. The core factor affecting the reaction selectivity is the effective reaction time of chlorine gas. It is impossible to control the effective reaction time by controlling the feeding method of liquid chlorine and the effective mixing of liquid chlorine and difluoroethane, so as to improve the selectivity of the product difluoroethyl chloride. To solve the above technical problems, we have designed a high-efficiency mixer for difluoroethane and chlorine gas. Content of the Utility Model

[0005] The purpose of the utility model is to provide a high-efficiency mixer for difluoroethane and chlorine gas, which has the advantages of improving the single-pass conversion rate of difluoroethyl chloride, reducing the output of tower bottom residue, reducing the load of the rectification system, reducing the comprehensive energy consumption of water, electricity, steam and air, improving the purity of the product, and ensuring the raw material supply of VDF, and solves the problem that the core factor affecting the reaction selectivity is the effective reaction time of chlorine gas, and it is impossible to control the effective reaction time by controlling the feeding method of liquid chlorine and the effective mixing of liquid chlorine and difluoroethane.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A high-efficiency mixer for difluoroethane and chlorine gas, including a tank body, the top of the tank body is fixedly connected with a tank cover through bolts and nuts, a stirring mechanism is installed on the surface of the tank body, feeding mechanisms are installed on both sides of the top of the tank cover, a baffle plate II is arranged in the inner cavity of the tank body, and a vibration mechanism is installed between the baffle plate II and the tank cover;

[0007] The feeding mechanism includes a feeding pipe, a spiral pipe, a Venturi injector, a first baffle plate and a solenoid valve. The vibration mechanism includes a connecting rod, a connecting plate, an electric telescopic rod and a sealing sleeve. The lower end of the spiral pipe penetrates and is fixedly embedded in the top of the tank cover and communicates with the Venturi injector.

[0008] Preferably, the upper end of the spiral pipe communicates with one end of the feeding pipe. The number of the first baffle plates is several, and they are respectively fixedly connected to the inner wall of the feeding pipe. The solenoid valve is installed on the surface of the spiral pipe away from the feeding pipe.

[0009] Preferably, the connecting rod penetrates and is fixedly embedded in the surface of the second baffle plate. The upper end of the connecting rod penetrates to the top of the tank cover and is fixedly connected to the bottom of the connecting plate. The bottom end of the electric telescopic rod is fixedly connected to the top of the tank cover through a bolt. The top end of the electric telescopic rod is fixedly connected to the bottom of the connecting plate through a bolt. The sealing sleeve is sleeved on the surface of the upper end of the connecting rod, and the outer surface of the sealing sleeve is fixedly connected to the surface of the tank cover.

[0010] Preferably, support plates are fixedly connected to both the front and rear sides of the inner wall of the tank body. The lower end of the connecting rod slides through to the bottom of the support plate. A spring is movably sleeved on the surface of the lower end of the connecting rod, and the lower end of the spring is fixedly connected to the top of the support plate.

[0011] Preferably, the stirring mechanism includes a rotating rod. The lower end of the rotating rod is rotationally embedded in the bottom of the tank body through a bearing. A stirring paddle is sleeved and welded on the surface of one end of the rotating rod located in the inner cavity of the tank body. A motor is fixedly connected to the bottom of the right side of the tank body through a support. A first belt pulley is fixedly connected to the rotating shaft of the motor. A second belt pulley is fixedly connected to the lower end of the rotating rod. A belt is drivingly connected to the surfaces of the first belt pulley and the second belt pulley.

[0012] Preferably, a discharge valve is installed and communicated on the left side of the bottom of the tank body. An observation window is fixedly embedded and connected to the front surface of the tank body.

[0013] Preferably, the inner diameter of the spiral pipe gradually decreases from top to bottom, and its outer diameter remains unchanged.

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

[0015] 1. The utility model changes and controls the feeding modes of liquid chlorine and 1,1-difluoroethane through a feeding pipe, a spiral pipe and a Venturi ejector, controls the effective mixing of liquid chlorine and 1,1-difluoroethane to control the effective reaction time, thereby improving the selectivity of the product monochloro-1,1-difluoroethane. Moreover, a multiple-direction baffle plate I is installed in the feeding pipe to enhance the enhancement effect. A spiral variable-diameter pipe is adopted at the inlet of the mixer, and a Venturi-form injection port is adopted at the outlet. Multiple-direction baffle plates II are additionally arranged inside the mixer to further enhance the mixing effect. The molecules of the two materials are cross-distributed with each other to achieve uniform distribution to each reaction tower.

[0016] 2. The utility model controls the operation of the motor. With the cooperation of a pulley I, a pulley II and a belt, the rotating rod and the stirring paddle rotate to stir and mix the liquid chlorine and 1,1-difluoroethane falling to the bottom inside the tank. Combined with the feeding mechanism and the baffle plate II, it can achieve the efficient mixing of 1,1-difluoroethane and chlorine gas, effectively control the effective reaction time, and solve the problem of many by-products caused by uneven local concentration distribution of chlorine gas. It will improve the conversion rate and selectivity of the reaction. Among them, the single-pass conversion rate of the raw material 1,1-difluoroethane is greatly improved, the selectivity of the product monochloro-1,1-difluoroethane is also improved, the content of key components in the material increases significantly, the purity of the monochloro-1,1-difluoroethane produced by the fractionation system increases, the relative steam consumption is reduced, and the electric energy is greatly saved.

[0017] 3. The utility model controls the telescopic movement of the electric telescopic rod to drive the connecting plate and the connecting rod to move up and down reciprocally, and then drives the baffle plate II to move up and down, thus having the advantage of being able to vibrate the baffle plate II, effectively avoiding the adhesion of liquid chlorine and 1,1-difluoroethane liquid beads on the baffle plate II after the feeding is completed and being unable to fall to the bottom inside the tank for stirring and mixing reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structure schematic diagram of the utility model;

[0019] Figure 2 is a partial cross-sectional three-dimensional schematic Figure 1 ;

[0020] Figure 3 is of the utility model Figure 2 an enlarged schematic diagram of A in;

[0021] Figure 4 is a partial cross-sectional three-dimensional schematic Figure 2 ;

[0022] Figure 5 is of the utility model Figure 4 an enlarged schematic diagram of B in.

[0023] In the figure: 1. Tank body; 2. Tank cover; 3. Stirring mechanism; 31. Rotating rod; 32. Stirring paddle; 33. Motor; 34. Pulley one; 35. Pulley two; 36. Belt; 4. Feeding mechanism; 41. Feeding pipe; 42. Spiral pipe; 43. Venturi ejector; 44. Baffle one; 45. Solenoid valve; 5. Baffle two; 6. Vibration mechanism; 61. Connecting rod; 62. Connecting plate; 63. Electric telescopic rod; 64. Sealing sleeve; 65. Support plate; 66. Spring; 7. Discharge valve; 8. Observation window. Detailed implementation mode

[0024] Please refer to Figures 1-5 , a high-efficiency mixer for difluoroethane and chlorine, comprising a tank body 1, the top of the tank body 1 is fixedly connected with a tank cover 2 through bolts and nuts, a stirring mechanism 3 is installed on the surface of the tank body 1, feeding mechanisms 4 are installed on both sides of the top of the tank cover 2, a baffle two 5 is arranged in the inner cavity of the tank body 1, and a vibration mechanism 6 is installed between the baffle two 5 and the tank cover 2;

[0025] The feeding mechanism 4 includes a feeding pipe 41, a spiral pipe 42, a Venturi ejector 43, a baffle one 44 and a solenoid valve 45, the vibration mechanism 6 includes a connecting rod 61, a connecting plate 62, an electric telescopic rod 63 and a sealing sleeve 64, and the lower end of the spiral pipe 42 penetrates and is fixedly embedded in the top of the tank cover 2 and is communicated with the Venturi ejector 43.

[0026] Please refer to Figure 1 , Figure 2 and Figure 3 , the upper end of the spiral pipe 42 is communicated with one end of the feeding pipe 41, the number of the baffles one 44 is several, and they are respectively fixedly connected to the inner wall of the feeding pipe 41. By arranging the baffles one 44, the mixing effect is enhanced. The solenoid valve 45 is installed on the surface of the spiral pipe 42 far away from the feeding pipe 41. By arranging the solenoid valve 45, the opening and closing of the feeding are controlled.

[0027] Please refer to Figure 1 , Figure 4 and Figure 5 , the connecting rod 61 penetrates and is fixedly embedded in the surface of the baffle two 5, the upper end of the connecting rod 61 penetrates to the top of the tank cover 2 and is fixedly connected to the bottom of the connecting plate 62. By arranging the connecting rod 61, the indirect connection between multiple baffles two 5 is realized, so that when the connecting plate 62 drives it to move, multiple baffles two 5 can be driven to move together at the same time. The bottom end of the electric telescopic rod 63 is fixedly connected to the top of the tank cover 2 through bolts, the top end of the electric telescopic rod 63 is fixedly connected to the bottom of the connecting plate 62 through bolts, and the sealing sleeve 64 is sleeved on the surface of the upper end of the connecting rod 61. By arranging the sealing sleeve 64, the sealing between the connecting rod 61 and the tank cover 2 is realized, and at the same time, the movement of the connecting rod 61 is not affected when the connecting plate 62 moves. The outer surface of the sealing sleeve 64 is fixedly connected to the surface of the tank cover 2.

[0028] Please refer to Figure 4 and Figure 5 On both the front and rear sides of the inner wall of the tank body 1, there are fixed connection support plates 65. The lower end of the connecting rod 61 slides through to the bottom of the support plate 65. A spring 66 is movably sleeved on the surface of the lower end of the connecting rod 61. By setting the support plate 65 and the spring 66, a buffer is carried out when the baffle plate two 5 moves downward, making it more stable during vibration. The lower end of the spring 66 is fixedly connected to the top of the support plate 65.

[0029] Please refer to Figure 2 and Figure 4 The stirring mechanism 3 includes a rotating rod 31. The lower end of the rotating rod 31 is rotationally embedded in the bottom of the tank body 1 through a bearing. On the surface of one end of the rotating rod 31 located in the inner cavity of the tank body 1, there is a welded stirring paddle 32. At the bottom on the right side of the tank body 1, there is a fixed connection support through a support. The rotating shaft of the motor 33 is fixedly connected with a first belt pulley 34. The lower end of the rotating rod 31 is fixedly connected with a second belt pulley 35. A belt 36 is drivingly connected to the surfaces of the first belt pulley 34 and the second belt pulley 35. By setting the first belt pulley 34, the second belt pulley 35 and the belt 36, the rotating rod 31 is rotated under the drive of the motor 33, and then the stirring paddle 32 rotates to stir and mix the raw materials.

[0030] Please refer to Figure 1 and Figure 2 On the left side of the bottom of the tank body 1, there is an installed and connected discharge valve 7. By setting the discharge valve 7, it is convenient to discharge the product after the mixer reaction. On the front of the tank body 1, there is a fixedly embedded observation window 8. By setting the observation window 8, it is convenient to observe the situation inside the mixer through it.

[0031] Please refer to Figure 1 The inner diameter of the spiral tube 42 gradually becomes smaller from top to bottom, and its outer diameter remains unchanged.

[0032] In use, the feeding mode of liquid chlorine and difluoroethane is changed through the feeding pipe 41, the spiral pipe 42 and the Venturi ejector 43, and the effective mixing of liquid chlorine and difluoroethane is controlled to control the effective reaction time, thereby improving the selectivity of the product 1-chloro-2,2-difluoroethane. Moreover, a multi-directional baffle plate I 44 is installed in the feeding pipe 41 to enhance the enhancement effect, and a multi-directional baffle plate II 5 is additionally arranged inside the mixer to further strengthen the mixing effect. The molecules of the two materials are cross-distributed with each other to achieve uniform distribution to each reaction tower. The operation of the control motor 33 makes the rotating rod 31 and the stirring paddle 32 rotate under the cooperation of the pulley I 34, the pulley II 35 and the belt 36, so as to stir and mix the liquid chlorine and difluoroethane falling to the bottom inside the tank body 1. In combination with the feeding mechanism 4 and the baffle plate II 5, the high-efficiency mixing of difluoroethane and chlorine gas is realized. By controlling the expansion and contraction of the electric telescopic rod 63, the connecting plate 62 and the connecting rod 61 are driven to move up and down reciprocally, and then the baffle plate II 5 is driven to move up and down, so that the baffle plate II 5 can be vibrated, effectively avoiding the adhesion of liquid chlorine and difluoroethane droplets on the baffle plate II 5 after the feeding is completed.

[0033] To sum up: for this high-efficiency mixer for difluoroethane and chlorine gas, through the cooperation of the stirring mechanism 3, the feeding mechanism 4, the baffle plate II 5 and the vibration mechanism 6, it solves the problem that the core factor affecting the reaction selectivity is the effective reaction time of chlorine gas, and the effective reaction time cannot be controlled by controlling the feeding mode of liquid chlorine and the effective mixing of liquid chlorine and difluoroethane.

Claims

1. A high-efficiency mixer for difluoroethane and chlorine, comprising a tank body (1), the top of which is fixedly connected to a tank cover (2) by bolts and nuts, characterized in that: A stirring mechanism (3) is installed on the surface of the tank body (1), feeding mechanisms (4) are installed on both sides of the top of the tank cover (2), a baffle plate 2 (5) is provided in the inner cavity of the tank body (1), and a vibration mechanism (6) is installed between the baffle plate 2 (5) and the tank cover (2); The feeding mechanism (4) comprises a feeding pipe (41), a spiral tube (42), a venturi ejector (43), a baffle plate (44) and a solenoid valve (45); the vibration mechanism (6) comprises a connecting rod (61), a connecting plate (62), an electric telescopic rod (63) and a sealing sleeve (64); the lower end of the spiral tube (42) penetrates and is fixedly embedded in the top of the tank cover (2) and is connected to the venturi ejector (43).

2. A high-efficiency mixer of difluoroethane and chlorine according to claim 1, characterized in that: The upper end of the spiral tube (42) is connected to one end of the feed pipe (41), the number of the baffle plates (44) is several and they are respectively fixedly connected to the inner wall of the feed pipe (41), and the solenoid valve (45) is installed on the surface of the spiral tube (42) away from one end of the feed pipe (41).

3. A high-efficiency mixer of difluoroethane and chlorine according to claim 1, characterized in that: The connecting rod (61) penetrates and is fixedly embedded in the surface of the second baffle plate (5); the upper end of the connecting rod (61) penetrates to the top of the tank cover (2) and is fixedly connected to the bottom of the connecting plate (62); the lower end of the electric telescopic rod (63) is fixedly connected to the top of the tank cover (2) by bolts; the top end of the electric telescopic rod (63) is fixedly connected to the bottom of the connecting plate (62) by bolts; the sealing sleeve (64) is sleeved on the surface of the upper end of the connecting rod (61); the outer surface of the sealing sleeve (64) is fixedly connected to the surface of the tank cover (2).

4. A high-efficiency mixer of difluoroethane and chlorine according to claim 1, characterized in that: Support plates (65) are fixedly connected to the front and rear sides of the inner wall of the tank body (1); the lower end of the connecting rod (61) slides through the bottom of the supporting plate (65); a spring (66) is movably sleeved on the surface of the lower end of the connecting rod (61); the lower end of the spring (66) is fixedly connected to the top of the supporting plate (65).

5. A high-efficiency mixer of difluoroethane and chlorine according to claim 1, characterized in that: The stirring mechanism (3) comprises a rotating rod (31), the lower end of which is rotatably embedded in the bottom of the tank body (1) via a bearing, a stirring paddle (32) is welded on the surface of the rotating rod (31) located at one end of the inner cavity of the tank body (1), a motor (33) is fixedly connected to the bottom of the right side of the tank body (1) via a support, the rotating shaft of the motor (33) is fixedly connected to a belt pulley 1 (34), the lower end of the rotating rod (31) is fixedly connected to a belt pulley 2 (35), and the surfaces of the belt pulley 1 (34) and the belt pulley 2 (35) are transmission-connected with a belt (36).

6. A difluoroethane and chlorine efficient mixer according to claim 1, characterized in that: A discharge valve (7) is installed and connected to the left side of the bottom of the tank body (1), and an observation window (8) is fixedly embedded and connected to the front of the tank body (1).

7. A high-efficiency mixer of difluoroethane and chlorine according to claim 1, characterized in that: The inner diameter of the spiral tube (42) gradually decreases from top to bottom, and its outer diameter remains unchanged.

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