Reaction kettle for preparing 2, 4-difluorobenzonitrile
By introducing a sieve basket and rope structure into the reactor, the problem of liquid product retention in the prior art was solved, achieving efficient filtration and temperature control, and improving the preparation efficiency of 2,4-difluorobenzonitrile.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-03-24
AI Technical Summary
In the existing process for preparing 2,4-difluorobenzonitrile, frequent container replacement and filtration are required after the reaction, leading to the retention and loss of liquid products.
A reactor with a sieve basket and ropes was designed. Filtration is achieved by turning the sieve basket over the ropes. The combination of impeller stirring and heat preservation tank provides temperature, reduces liquid retention, and improves filtration efficiency.
This reduces liquid retention during the reaction process, improves filtration efficiency, avoids loss of liquid products during container changes, and ensures product integrity and efficiency.
Smart Images
Figure CN224024985U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to chemical product preparation technical field, concretely is a kind of reaction kettle for preparing 2,4-difluorobenzonitrile. BACKGROUND
[0002] 2,4-difluorobenzonitrile is an important intermediate, can be used for the synthesis of medicine, pesticide and fluorine-containing polymer, with it as intermediate, new drug for resisting AIDS can be synthesized, and the pesticide synthesized with it is strong in selectivity, less in use amount, low in toxicity to human, low in residue, is a kind of green pesticide with very broad development prospect. In the existing preparation process, in the production process of 2,4-difluorobenzonitrile, the product after reaction needs to be filtered, and the filtrate is distilled to obtain white crystal 2,4-difluorobenzonitrile, but the existing filtering process needs to lead the product obtained by reaction out of the reaction kettle, and liquid may be retained in the pipeline during the process, so a reaction kettle for preparing 2,4-difluorobenzonitrile with the functions of reducing liquid retention and filtering product needs to be developed. SUMMARY
[0003] In view of the above technical problems, the utility model provides a kind of reaction kettle for preparing 2,4-difluorobenzonitrile with the functions of reducing liquid retention and filtering product to solve the problem that liquid product needs to be frequently replaced in preparation container due to the need of filtering in the existing preparation process, so that liquid retention and loss of liquid product occur during the replacement of container.
[0004] To solve the above technical problems, the utility model discloses a kind of reaction kettle for preparing 2,4-difluorobenzonitrile, including shell, the shell upper end is fixedly connected with feed pipe, lower part one side is fixedly connected with discharge pipe, the shell upper part one side is fixedly connected with gas inlet pipe, lower part one side is fixedly connected with gas outlet pipe, the bracket is fixedly connected in the shell lower part, the bracket lower end is fixedly connected with speed reducer clutch, motor, balance block, the motor output end is connected with second belt pulley, the speed reducer clutch is connected with impeller shaft, the impeller shaft lower end is connected with first belt pulley, the first belt pulley, second belt pulley are connected by belt drive, the impeller shaft upper end passes through the bracket and is fixedly connected with impeller, the impeller is provided with sieve basket above, the sieve basket upper side is hinged with the shell inner wall, the shell one side wall is hinged with movable plate, the sieve basket upper side other side is fixedly connected with rope, the heat preservation tank outer side upper side is fixedly connected with fixed frame, the fixed frame is rotatably connected with bearing, the bearing one end is connected with bearing motor output end, the rope other end passes through the shell and is fixedly connected with the bearing.
[0005] Further, the sieve basket upper side is fixedly connected with support plate, and the support plate is in contact with the movable plate.
[0006] Further, the shell is fixedly connected with a heat preservation tank outside through a plurality of connecting plates, one side of the heat preservation tank is fixedly connected with an inlet pipe, and the other side is fixedly connected with an outlet pipe.
[0007] Further, the shell is fixedly connected with a heat preservation tank outside through a plurality of connecting plates, one side of the heat preservation tank is fixedly connected with an inlet pipe, and the other side is fixedly connected with an outlet pipe.
[0008] Further, the shell is fixedly connected with a heat preservation tank outside through a plurality of connecting plates, one side of the heat preservation tank is fixedly connected with an inlet pipe, and the other side is fixedly connected with an outlet pipe.
[0009] Compared with the prior art, the utility model has the following advantages:
[0010] The utility model discloses a rope is set up above the sieve basket, can conveniently turn over the sieve basket, reaches the purpose of filtering the product in the shell, the sieve basket cover is set up above the sieve basket, can prevent the overflow of catalyst from the sieve basket in the reaction process, the storage box is connected outside the heat preservation tank, can temporarily store the solid material filtered out, the wave wheel, the speed reducer clutch and the motor are arranged below the shell, can accelerate the reaction of reactant in the rotation process, and the heat preservation tank can provide the temperature environment meeting the reaction demand for the shell. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is structure schematic drawing of the utility model.
[0012] Figure 2 It is fixed frame, bearing, bearing motor overhead view of the utility model.
[0013] Figure 3 It is fixed plate, limit post, connecting rod, disc structure schematic drawing of the utility model.
[0014] Figure 4 It is fixed plate, movable block, connecting rod structure schematic drawing of the utility model.
[0015] Figure 5 It is movable block, first connecting rod, second connecting rod structure schematic drawing of the utility model
[0016] In the figure: 1, shell, 2, feed pipe, 3, discharge pipe, 4, gas inlet pipe, 5, gas outlet pipe, 6, rope, 7, sieve basket, 8, support plate, 9, movable plate, 10, storage box, 11, impeller, 12, support, 13, impeller shaft, 14, speed reducer clutch, 15, first pulley, 16, motor, 17, second pulley, 18, belt, 19, balance block, 20, heat preservation tank, 21, inlet pipe, 22, outlet pipe, 23, fixed frame, 24, bearing, 25, bearing motor, 26, sieve basket cover, 27, fixed plate, 28, movable block, 29, limiting column, 30, connecting rod, 31, disc, 32, disc motor, 33, first connecting rod, 34, second connecting rod. DETAILED DESCRIPTION
[0017] The utility model makes further explanation to the utility model in combination with the drawings.
[0018] As Figures 1 to 5 The utility model discloses a reaction kettle for preparing 2, 4-difluorobenzonitrile, which comprises a shell 1, a feed pipe 2 fixedly connected to the upper end of the shell 1, a discharge pipe 3 fixedly connected to one side of the lower part of the shell 1, a gas inlet pipe 4 fixedly connected to one side of the upper part of the shell 1, a gas outlet pipe 5 fixedly connected to one side of the lower part of the shell 1, a support 12 fixedly connected to the lower part of the shell 1, a speed reducer clutch 14, a motor 16 and a balance block 19 fixedly connected to the lower end of the support 12, a second pulley 17 connected to the output end of the motor 16, an impeller shaft 13 connected to the speed reducer clutch 14, a first pulley 15 connected to the lower end of the impeller shaft 13, the first pulley 15 and the second pulley 17 being transmissionally connected through a belt 18, the impeller shaft 13 being fixedly connected to an impeller 11 through the support 12, a sieve basket 7 arranged above the impeller 11, the sieve basket 7 being hingedly connected to one side of the inner wall of the shell 1, one side wall of the shell 1 being hingedly connected to the upper part of a movable plate 9, a rope 6 fixedly connected to the other side of the sieve basket 7, a fixed frame 23 fixedly connected to the outer side of a heat preservation tank 20, a bearing 24 rotationally connected to the fixed frame 23, one end of the bearing 24 being connected to the output end of a bearing motor 25, and the other end of the rope 6 being fixedly connected to the bearing 24 through the shell 1.
[0019] In order to conveniently push open the movable plate 9, a support plate 8 is fixedly connected to one side of the sieve basket 7.
[0020] In order to provide the required temperature conditions for the reaction, the shell 1 is fixedly connected to the heat preservation tank 20 through a plurality of connecting plates, one side of the heat preservation tank 20 is fixedly connected to an inlet pipe 21, and the other side of the heat preservation tank 20 is fixedly connected to an outlet pipe 22.
[0021] In order to prevent solid material from escaping in the liquid, the fixed plate 27 is fixedly connected to the inner wall of the sieve basket 7, the sliding groove is formed on the fixed plate 27, the sliding groove is composed of a vertical sliding groove and a quarter circular arc sliding groove, the movable block 28 is slidably connected to the inner side of the fixed plate 27, the two movable blocks 28 are fixedly connected through the connecting rod 30, the limiting column 29 is fixedly connected to the movable block 28, the limiting column 29 and the connecting rod 30 are slidably connected with the fixed plate 27 through the sliding groove, the disc 31 is rotatably connected to the outer side of the fixed plate 27 through the rotating shaft, one end of the rotating shaft is connected with the disc motor 32, the other end is fixedly connected with the second connecting rod 34, the second connecting rod 34 is rotatably connected with the first connecting rod 33, the other end of the first connecting rod 33 is fixedly connected with the connecting rod 30, and the upper end surface of the movable block 28 is fixedly connected with the sieve basket cover 26.
[0022] In order to avoid the volatilization of the material into the air, and collect the filtered solid material, the heat preservation tank 20 is fixedly connected with the storage box 10 on one side, the storage box 10 is arranged on the outer side of the movable plate 9, and the door plate is hingedly connected to one side of the storage box 10.
[0023] The working process of the embodiment is as follows:
[0024] In the preparation of 2,4-difluorobenzonitrile, nitrogen is first introduced from the gas inlet pipe 4, and the air in the shell 1 is discharged from the gas outlet pipe 5. The nitrogen inlet condition is maintained, the disc motor 32 is started, the disc motor 32 drives the disc 31 and the second connecting rod 34 connected with the rotating shaft to rotate, the second connecting rod 34 drives the first connecting rod 33 in the process of rotating, the first connecting rod 33 drives the connecting rod 30 to move upwards along the sliding groove on the fixed plate 27, when the limiting column 29 reaches the top of the vertical sliding groove, the connecting rod 30 moves upwards along the arc-shaped sliding groove, lifts and makes the sieve basket cover 26 overturn, at this time, the reactants such as toluene, 2,4-difluorobromobenzene and sodium cyanide are put into through the feeding pipe 2, the reactants and catalysts fall into the sieve basket 7 in the shell 1, the disc 31 is reversely rotated, the sieve basket cover 26 is overturned and falls back to the original position, at this time, the heat medium is introduced into the cavity formed between the heat preservation tank 20 and the shell 1 through the inlet pipe 21, then the motor 16 is started, the second belt pulley 17 drives the first belt pulley 15 to rotate through the belt 18, so that the impeller 11 rotates, and the material in the shell 1 is stirred, after the reaction is completed, the shaft bearing 24 is rotated through the bearing motor 25, the rope 6 is wound on the shaft bearing 24, the rope 6 is tightened and collected, at the same time, the sieve basket 7 is also lifted, the solid and the liquid in the product are separated, the movable plate 9 is opened, the sieve basket cover 26 is overturned by a certain angle, then the solid is poured into the storage box 10, the bearing motor 25 is reversely rotated, the rope 6 wound on the shaft bearing 24 is loosened, the sieve basket 7 is put back to the original position, the liquid part leaves the shell 1 through the discharge pipe 3, and white crystals 2,4-difluorobenzonitrile can be obtained after pressure reduction and fractional distillation, the solid is taken out through the door plate arranged on the storage box 10 and uniformly treated.
Claims
1. A reaction vessel for preparing 2,4-difluorobenzonitrile, comprising a shell (1), wherein a feed pipe (2) is fixedly connected to the upper end of the shell (1) and a discharge pipe (3) is fixedly connected to one side of the lower part, characterized in that: The upper side of the housing (1) is fixedly connected to a gas inlet pipe (4), and the lower side is fixedly connected to a gas outlet pipe (5). The lower part of the housing (1) is fixedly connected to a bracket (12). The lower end of the bracket (12) is fixedly connected to a reduction clutch (14), a motor (16), and a balance block (19). The output end of the motor (16) is connected to a second pulley (17). The reduction clutch (14) is connected to a pulsator shaft (13). The lower end of the pulsator shaft (13) is connected to a first pulley (15). The first pulley (15) and the second pulley (17) are connected by a belt (18). The pulsator shaft (13) The upper end passes through the bracket (12) and is fixedly connected to the impeller (11). A sieve basket (7) is provided above the impeller (11). One side of the upper part of the sieve basket (7) is hinged to the inner wall of the shell (1). A movable plate (9) is hinged to one side wall of the shell (1). A rope (6) is fixedly connected to the other side of the upper part of the sieve basket (7). A fixed frame (23) is fixedly connected to the upper part of the outer side of the heat preservation tank (20). A bearing (24) is rotatably connected to the fixed frame (23). One end of the bearing (24) is connected to the output end of the bearing motor (25). The other end of the rope (6) passes through the shell (1) and is fixedly connected to the bearing (24).
2. The reaction vessel for preparing 2,4-difluorobenzonitrile according to claim 1, characterized in that: A support plate (8) is fixedly connected to one side above the sieve basket (7), and the support plate (8) is in contact with the movable plate (9).
3. The reaction vessel for preparing 2,4-difluorobenzonitrile according to claim 1, characterized in that: The outer shell (1) is fixedly connected to a heat preservation tank (20) by several connecting plates. The heat preservation tank (20) is fixedly connected to an inlet pipe (21) on one side and an outlet pipe (22) on the other side.
4. The reaction vessel for preparing 2,4-difluorobenzonitrile according to claim 1, characterized in that: The inner walls of the sieve basket (7) are fixedly connected to two fixed plates (27). The fixed plates (27) are provided with sliding grooves. The inner side of the fixed plates (27) is slidably connected to movable blocks (28). The movable blocks (28) on both sides are fixedly connected by connecting rods (30). The movable blocks (28) are fixedly connected to limit posts (29). The limit posts (29) and connecting rods (30) are slidably connected to the fixed plates (27) through the sliding grooves. The outer side of the fixed plates (27) is rotatably connected to a disc (31) through a rotating shaft. One end of the rotating shaft is connected to the output end of the disc motor (32), and the other end is fixedly connected to the second connecting rod (34). The second connecting rod (34) is rotatably connected to the first connecting rod (33). The other end of the first connecting rod (33) is fixedly connected to the connecting rod (30). The upper end face of the movable block (28) is fixedly connected to the sieve basket cover (26).
5. The reaction vessel for preparing 2,4-difluorobenzonitrile according to claim 1, characterized in that: A storage box (10) is fixedly connected to one side of the heat preservation tank (20). The storage box (10) is located on the outside of the movable plate (9). A door panel is hinged to one side of the storage box (10).