Recovery device for dimethylformamide production

Abstract

According to the technical scheme, the recovery device comprises a reaction box, the top face of the reaction box is provided with a first communicating pipe, the first communicating pipe is communicated with the reaction box, an exhaust pipe is arranged in the first communicating pipe in a sleeved mode, and the exhaust pipe is communicated with the reaction box. The exhaust pipe is composed of a cylindrical pipe part and a conical pipe, the bottom face of the conical pipe is communicated with the cylindrical pipe part, two through holes are formed in the outer wall face of the cylindrical pipe part of the exhaust pipe, and the outer wall face of the cylindrical pipe part of the exhaust pipe is sleeved with a spring. According to the dimethyl formamide generating device, methylamine and ethyl formate which are used for generating dimethyl formamide can be placed in a centralized mode, normal contact reaction can be carried out on the methylamine and the ethyl formate, through the design of the exhaust pipe, when internal reaction is too violent, the exhaust pipe can be ejected out, gas is exhausted through the through holes in the exhaust pipe, and through the arrangement of the exhaust pipe and the design of the conical pipe of the exhaust pipe, the exhaust pipe can be recycled. And the exhaust pipe can be more conveniently ejected out by gas.

Description

Technical Field

[0001] The utility model relates to the technical field of DMF production, in particular to a recovery device for dimethylformamide production. Background Art

[0002] When making polyurethane synthetic leather by wet process, dimethylformamide (DMF) is used as solvent to dissolve polyurethane resin to form slurry, the slurry is impregnated and coated on the surface of base fabric, and then washed with water to remove dimethylformamide, thereby generating wastewater containing dimethylformamide. In order to avoid the pollution of wastewater containing dimethylformamide to the environment, the dimethylformamide in the wastewater needs to be recovered.

[0003] A dimethylformamide distillation recovery co-production device with announcement number CN219072103U has the following defects in use:

[0004] The utility model is capable of distilling and recovering residual dimethylformamide in liquid and gas by respectively arranging a drying tank, a separation tank, a finished product recovery tank and a residual solution recovery tank, thereby improving the overall recovery efficiency. However, in the actual practical process, if there is a deviation in the control of the amount of raw materials, the internal reaction is too intense and the gas pressure is too high, it is very likely to cause serious safety hazards. For this reason, we propose a recovery device for dimethylformamide production. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a recovery device for the production of dimethylformamide, which solves the problem that in the actual practical process, if there is a deviation in the control of the amount of raw materials, the internal reaction is too intense and the gas pressure is too high, which is likely to cause serious safety hazards.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A recovery device for dimethylformamide production comprises a reaction box, wherein the top surface of the reaction box is provided with a first connecting pipe, the first connecting pipe is connected to the reaction box, an exhaust pipe is sleeved inside the first connecting pipe, the exhaust pipe consists of a cylindrical tube part and a conical tube connected to the bottom surface, two through holes are provided on the outer wall surface of the cylindrical tube part of the exhaust pipe, and a spring is sleeved on the outer wall surface of the cylindrical tube part of the exhaust pipe.

[0008] Preferably, a sliding groove is provided on the outer wall surface of the reaction box, a placement bin is sleeved inside the sliding groove, and a fixing frame is clamped on the bottom surface of the reaction box.

[0009] Preferably, the top surface of the reaction box has a second connecting pipe, the second connecting pipe is connected to the reaction box, a drying pipe is sleeved inside the second connecting pipe, and a drying bag is sleeved inside the drying pipe.

[0010] Preferably, a connecting pipe is sleeved inside the drying tube, and a collecting box is sleeved on the outer wall of the connecting pipe away from one end of the drying tube. A first fixing hole is opened on the outer wall of the collecting box, and a perspective block is clamped inside the first fixing hole. The perspective block is made of glass, and a scale is fixedly installed on the outer wall of the collecting box.

[0011] Preferably, a through hole is formed on the top surface of the collecting box, a connecting rod is sleeved inside the through hole, a heat-conducting shell is fixedly mounted on the bottom end of the connecting rod, and a heating resistor is fixedly mounted inside the heat-conducting shell.

[0012] Preferably, a second fixing hole is provided on the top surface of the collecting box, a water storage tank is fixedly installed inside the second fixing hole, the water storage tank is composed of a cylindrical tube part and a box body part connected thereto, a fixing hole is provided on the outer wall surface of the cylindrical tube part of the water storage tank, and a stop valve is fixedly installed inside the fixing hole of the water storage tank.

[0013] In summary, the utility model mainly has the following beneficial effects:

[0014] 1. By setting up a reaction box, the design of the reaction box can make it possible to place methylamine and ethyl formate that generate dimethylformamide in a centralized manner so that they can normally carry out contact reaction. By designing the exhaust pipe, when the internal reaction is too intense, the exhaust pipe can be pushed out and the gas can be discharged through the through hole thereon;

[0015] 2. The conical shape of the exhaust pipe can make it easier for the gas to push out of the exhaust pipe. The spring design can quickly pull the exhaust pipe back to its original position after the gas is exhausted, making it easier for the gas to continue to be collected inside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the split structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the reaction box structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the collection box of the utility model.

[0020] Figure numerals: 1. reaction box; 2. first connecting pipe; 3. exhaust pipe; 4. spring; 5. sliding groove; 6. placement bin; 7. fixing frame; 8. second connecting pipe; 9. drying pipe; 10. drying bag; 11. connecting pipe; 12. collecting box; 13. first fixing hole; 14. perspective block; 15. scale; 16. through hole; 17. connecting rod; 18. heat-conducting shell; 19. heating resistor; 20. second fixing hole; 21. water storage tank; 22. stop valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] refer to Figure 1-Figure 4 , a recovery device for dimethylformamide production, including a reaction box 1, through the design of the reaction box 1, methylamine and ethyl formate that generate dimethylformamide can be placed together, so that they can normally carry out contact reaction, the top surface of the reaction box 1 has a first connecting pipe 2, the first connecting pipe 2 is connected to the reaction box 1, the first connecting pipe 2 is sleeved with an exhaust pipe 3 inside, the exhaust pipe 3 is composed of a cylindrical tube part and a conical tube connected to the bottom surface, through the design of the exhaust pipe 3, when the internal reaction is too intense, the exhaust pipe 3 can be pushed out, and the gas can be discharged through the through holes thereon, through the conical tube design of the exhaust pipe 3, it is more convenient for the gas to push the exhaust pipe 3 out, the outer wall surface of the cylindrical tube part of the exhaust pipe 3 is provided with two through holes, the outer wall surface of the cylindrical tube part of the exhaust pipe 3 is sleeved with a spring 4, through the design of the spring 4, the exhaust pipe 3 can be quickly pulled back to its original position after the gas is exhausted, so as to facilitate the internal gas to continue to be collected;

[0023] The outer wall of the reaction box 1 is provided with a sliding groove 5, and the interior of the sliding groove 5 is provided with a placement bin 6. Through the design of the placement bin 6, it is convenient for the staff to pull it out at any time and add reactants to the interior in time to ensure the normal progress of the internal reaction. The bottom surface of the reaction box 1 is clamped with a fixing frame 7, and the top surface of the reaction box 1 has a second connecting pipe 8, and the second connecting pipe 8 is connected with the reaction box 1. The interior of the second connecting pipe 8 is provided with a drying tube 9, and the interior of the drying tube 9 is provided with a drying bag 10. Through the design of the drying tube 9 and the drying bag 10, it can be used for the production or the reaction itself. The existing moisture is filtered out to a certain extent to avoid affecting the purity of the produced dimethylformamide as much as possible. A connecting pipe 11 is sleeved inside the drying tube 9. The outer wall of the connecting pipe 11 away from the end of the drying tube 9 is sleeved with a collecting box 12. Through the design of the collecting box 12, solvent can be added to the inside. By utilizing the highly soluble property of dimethylformamide, it can be quickly collected. A first fixing hole 13 is opened on the outer wall of the collecting box 12. A perspective block 14 is clamped inside the first fixing hole 13. The perspective block 14 is made of glass. The collecting box 12 is provided with a first fixing hole 13. The outer wall surface of the collecting box 12 is fixedly installed with a scale 15. Through the perspective block 14 and the scale 15, the water level inside can be observed in time to determine whether water replenishment is needed. The top surface of the collecting box 12 is provided with a through hole 16. The inside of the through hole 16 is sleeved with a connecting rod 17. The bottom end of the connecting rod 17 is fixedly installed with a heat-conducting shell 18. The inside of the heat-conducting shell 18 is fixedly installed with a heating resistor 19. Through the design of the heating resistor 19, the inside of the collecting box 12 can be heated as a whole to heat a small amount of methanol generated during the reaction. Volatilization treatment is carried out to ensure the absorption purity of the solution as much as possible. A second fixing hole 20 is opened on the top surface of the collection box 12, and a water tank 21 is fixedly installed inside the second fixing hole 20. The water tank 21 is composed of a cylindrical tube part and a box body part connected thereto. A fixing hole is opened on the outer wall of the cylindrical tube part of the water tank 21, and a stop valve 22 is fixedly installed inside the fixed hole of the water tank 21. Through the design of the water tank 21 and the stop valve 22, the solvent can be added to the inside in time when the water level is low, thereby ensuring that the collection process of dimethylformamide can proceed normally.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A recovery device for dimethylformamide production, comprising a reaction box (1), characterized in that: The top surface of the reaction box (1) is provided with a first connecting pipe (2), the first connecting pipe (2) being connected to the reaction box (1), an exhaust pipe (3) being sleeved inside the first connecting pipe (2), the exhaust pipe (3) being composed of a cylindrical tube portion and a conical tube connected to the bottom surface thereof, two through holes being provided on the outer wall surface of the cylindrical tube portion of the exhaust pipe (3), and a spring (4) being sleeved on the outer wall surface of the cylindrical tube portion of the exhaust pipe (3).

2. A recovery device for dimethylformamide production according to claim 1, characterized in that: The outer wall surface of the reaction box (1) is provided with a sliding groove (5), the interior of the sliding groove (5) is sleeved with a placement bin (6), and the bottom surface of the reaction box (1) is clamped with a fixing frame (7).

3. A recovery device for dimethylformamide production according to claim 1, characterized in that: The top surface of the reaction box (1) is provided with a second connecting pipe (8), the second connecting pipe (8) is connected to the reaction box (1), a drying pipe (9) is sleeved inside the second connecting pipe (8), and a drying bag (10) is sleeved inside the drying pipe (9).

4. A recovery device for dimethylformamide production according to claim 3, characterized in that: A connecting pipe (11) is sleeved inside the drying tube (9); a collecting box (12) is sleeved on the outer wall of the connecting pipe (11) away from one end of the drying tube (9); a first fixing hole (13) is opened on the outer wall of the collecting box (12); a perspective block (14) is clamped inside the first fixing hole (13); the perspective block (14) is made of glass; and a scale (15) is fixedly mounted on the outer wall of the collecting box (12).

5. A recovery device for dimethylformamide production according to claim 4, characterized in that: The top surface of the collecting box (12) is provided with a through hole (16), a connecting rod (17) is sleeved inside the through hole (16), a heat-conducting shell (18) is fixedly mounted on the bottom end of the connecting rod (17), and a heating resistor (19) is fixedly mounted inside the heat-conducting shell (18).

6. A recovery device for dimethylformamide production according to claim 4, characterized in that: The top surface of the collecting box (12) is provided with a second fixing hole (20), a water storage tank (21) is fixedly installed inside the second fixing hole (20), the water storage tank (21) is composed of a cylindrical tube part and a box body part connected thereto, a fixing hole is provided on the outer wall surface of the cylindrical tube part of the water storage tank (21), and a stop valve (22) is fixedly installed inside the fixing hole of the water storage tank (21).

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