Condensing device for GBL production

Abstract

The utility model belongs to the technical field of chemical production, and particularly relates to a condensing device for GBL production, which comprises a condensing tank, a speed reducing motor, a rotating shaft and an air guide pipe, the condensing tank is provided with an air inlet, an air outlet and a discharge port, the condensing tank is provided with a shell inner wall and a shell outer wall, a cooling pipe is wound on the shell inner wall, a spiral guide plate is arranged inside the condensing tank, and the spiral guide plate is arranged on the spiral guide plate. A through groove is formed in the spiral guide plate, the gear motor is arranged outside the condensation tank, the rotating shaft is arranged in the condensation tank, the top end of the rotating shaft is in transmission connection with an output shaft of the gear motor, an air inlet cavity is formed in the rotating shaft, and fan blades and an air guide hole are arranged at the lower end of the rotating shaft; and the outer wall of the air guide pipe and the inner wall of the rotating shaft are sealed and rotationally connected. According to the device, gaseous 1, 4-butyrolactone is condensed by using two cooling means of air cooling and water cooling, so that the cooling speed is high, the cooling modes are diversified, and the cooling effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a condensing device for GBL production. Background Art

[0002] Currently, the production of 1,4-butyrolactone mainly uses 1,4-butanediol as raw material, which is first preheated and then reacted with hydrogen in the presence of a copper catalyst at a temperature of 230-240°C to obtain crude 1,4-butyrolactone, which is then distilled under reduced pressure to obtain the product; or 1,4-butanediol is reacted with a strong acid catalyst (such as sulfuric acid) to produce 1,4-butyrolactone and water, which are then purified by distillation to obtain the product.

[0003] Because distilled 1,4-butyrolactone is in a gaseous state and has a high boiling point, air condensers are typically used to cool it down and liquefy it for easier collection and storage. However, air condensers typically utilize natural convection or forced ventilation for cooling. Compared to straight-line condensers, air condensers have slower cooling rates and a more limited cooling method, significantly impacting cooling effectiveness.

[0004] For this reason, a condensing device for GBL production is urgently needed. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the utility model provides a condensing device for GBL production, comprising a condensing tank, a reduction motor, a rotating shaft and an air guide pipe, wherein an air inlet and an air outlet are provided on the top of the condensing tank, a lower hopper is provided at the bottom of the condensing tank, and a discharge port is provided at the bottom of the lower hopper, the condensing tank is provided with a shell inner wall and a shell outer wall, and a heat exchange cavity for cooling is formed between the shell inner wall and the shell outer wall, a cooling pipe is provided in the heat exchange cavity, the cooling pipe is coiled around the outside of the shell inner wall of the condensing tank, a cooling liquid inlet is provided at one end of the cooling pipe, and a cooling liquid outlet is provided at the other end, and the cooling liquid inlet and the cooling liquid outlet both pass through the shell outer wall of the condensing tank and extend outward, and a spiral guide pipe is fixedly provided on the inside of the shell inner wall of the condensing tank Flow plate, the spiral guide plate extends downward into the lower hopper, and a through groove is provided on the spiral guide plate, which is used for liquefied 1,4-butyrolactone to flow down from the spiral guide plate. The reduction motor is arranged on the outside of the condensation tank, and the rotating shaft is vertically arranged inside the condensation tank. The top of the rotating shaft passes through the condensation tank and is connected to the output shaft of the reduction motor through a bevel gear transmission pair. An opening is provided on the top of the rotating shaft, and an air intake cavity connected to the opening is provided inside the rotating shaft. A number of fan blades are provided at the lower end of the rotating shaft, and a number of air guide holes connected to the air intake cavity are provided at the lower end of the rotating shaft. The air guide pipe is arranged above the condensation tank, and one end of the air guide pipe penetrates downward into the air intake cavity of the rotating shaft, and the outer wall of the air guide pipe and the inner wall of the rotating shaft are sealed and rotatably connected.

[0006] Optionally, an exhaust valve is provided at the air outlet of the condensation tank.

[0007] In particular, the exhaust valve facilitates controlling exhaust.

[0008] Optionally, a discharge valve is provided at the discharge port of the condensation tank.

[0009] In particular, the discharge valve facilitates controlled discharge.

[0010] Optionally, supporting legs are provided below the condensation tank.

[0011] Optionally, the bevel gear transmission pair includes a meshing horizontal bevel gear and a vertical bevel gear, the horizontal bevel gear is fixedly sleeved on the outside of the upper end of the rotating shaft, and the vertical bevel gear is installed on the output shaft of the reduction motor.

[0012] Optionally, an inert cooling gas is introduced into the air duct, and the inert cooling gas is cooling nitrogen.

[0013] Optionally, the fan blades on the rotating shaft do not interfere with the spiral guide plate.

[0014] The present invention also includes other components that enable the normal operation of a condensing device for GBL production, which are conventional technical means in the field. In addition, devices or components not limited in the present invention all adopt conventional technical means in the field, such as reduction motors, etc.

[0015] The working principle of the utility model is to introduce coolant into the cooling pipe to pre-cool the condenser, then introduce gaseous 1,4-butyrolactone into the condenser through the air inlet, then start the reduction motor to drive the rotating shaft to rotate, and drive the fan blades to rotate, and at the same time introduce cooling nitrogen into the air guide pipe, and the temperature of the cooling nitrogen and the coolant can be controlled in the range of -40 to 0°C; in this way, most of the gaseous 1,4-butyrolactone entering the condenser is blown to the inner wall of the shell of the condenser by the fan blades, and under the guiding action of the spiral guide plate, it contacts the inner wall of the shell and is condensed and liquefied into liquid. , and flows down along the groove of the spiral guide plate and gathers in the lower hopper below. A small amount of gaseous 1,4-butyrolactone may remain in the center of the condenser, that is, near the rotating shaft. After the cooling nitrogen is ejected from the air guide hole of the rotating shaft, this part of the gaseous 1,4-butyrolactone can be cooled. Since nitrogen is an inert gas and is difficult to dissolve in liquid 1,4-butyrolactone, the gaseous 1,4-butyrolactone is liquefied and drips down, and the nitrogen after heat exchange is discharged from the gas outlet; finally, open the discharge valve to discharge the liquid 1,4-butyrolactone in the lower hopper.

[0016] The beneficial effect of the present invention is that, compared with the disadvantages of the straight-line condenser that is not suitable for high-boiling-point distillates and is prone to explosion, and the shortcomings of the air condenser that is slow to cool and has a single cooling method, the present device uses a condenser, a cooling tube, a reduction motor, a rotating shaft, fan blades and a spiral guide plate to condense gaseous 1,4-butyrolactone using both air cooling and water cooling methods, which not only has a fast cooling speed, but also has diverse cooling methods and good cooling effects; in addition, the spiral guide plate can not only provide a guiding effect for the gaseous distillate, but also increase the contact time between the gaseous distillate and the cooling medium, so that the gaseous distillate is fully cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 This is a schematic structural diagram of the spiral guide plate of the present invention.

[0020] In the figure: 1. Condensate tank, 2. Reducer motor, 3. Rotating shaft, 4. Air duct, 5. Air inlet, 6. Exhaust valve, 7. Discharge valve, 8. Inner wall of the shell, 9. Outer wall of the shell, 10. Cooling pipe, 11. Coolant inlet, 12. Coolant outlet, 13. Spiral guide plate, 14. Through groove, 15. Bevel gear transmission pair, 16. Fan blades, 17. Air guide hole. DETAILED DESCRIPTION

[0021] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is intended only to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work to all other embodiments obtained based on the embodiments of the present invention shall be included within the scope of protection of the present invention.

[0022] Example

[0023] like Figure 1-2As shown, the embodiment of the present invention provides a condensing device for GBL production, including a condensing tank 1, a reduction motor 2, a rotating shaft 3 and an air guide pipe 4. The top of the condensing tank 1 is provided with an air inlet 5 and an air outlet, and the air outlet is provided with an exhaust valve 6, the exhaust valve 6 is convenient for controlling exhaust, the bottom of the condensing tank 1 is provided with a lower hopper, the bottom of the lower hopper is provided with a discharge port, and the discharge port is provided with a discharge valve 7, the discharge valve 7 is convenient for controlling discharge, and the bottom of the condensing tank 1 is provided with a support leg; the condensing tank 1 is provided with a shell inner wall 8 and a shell outer wall 9, and a heat exchange cavity for cooling is formed between the inner wall 8 of the shell and the outer wall 9 of the shell, and a cooling pipe 10 is provided in the heat exchange cavity. The cooling pipe 10 is coiled outside the inner wall 8 of the shell of the condensing tank 1, and a coolant inlet 11 is provided at one end of the cooling pipe 10, and a coolant outlet 12 is provided at the other end. The coolant inlet 11 and the coolant outlet 12 both pass through the outer wall 9 of the shell of the condensing tank 1 and extend outward; a spiral guide plate 13 is fixedly provided inside the inner wall 8 of the shell of the condensing tank 1, and the spiral guide plate 13 extends downward into the lower hopper, and the spiral guide plate 13 extends downward into the lower hopper. The spiral guide plate 13 is provided with a through groove 14, which is used to allow the liquefied 1,4-butyrolactone to flow down from the spiral guide plate 13; the reduction motor 2 is arranged outside the condensation tank 1, and the rotating shaft 3 is vertically arranged inside the condensation tank 1. The top of the rotating shaft 3 passes through the condensation tank 1 and is connected to the output shaft of the reduction motor 2 through a bevel gear transmission pair 15, wherein the bevel gear transmission pair 15 includes a meshing horizontal bevel gear and a vertical bevel gear. The horizontal bevel gear is fixedly sleeved on the outside of the upper end of the rotating shaft 3, and the vertical bevel gear is installed on the reduction motor 2. On the output shaft of the motor 2; an opening is provided at the top of the rotating shaft 3, and an air intake cavity connected to the opening is provided inside the rotating shaft 3. A plurality of fan blades 16 are provided at the lower end of the rotating shaft 3, and the fan blades 16 do not interfere with the spiral guide plate 13. A plurality of air guide holes 17 connected to the air intake cavity are provided at the lower end of the rotating shaft 3. The air guide pipe 4 is provided above the condensation tank 1, and one end of the air guide pipe 4 downwardly penetrates into the air intake cavity of the rotating shaft 3, and the outer wall of the air guide pipe 4 is sealed and rotatably connected to the inner wall of the rotating shaft 3, and cooling nitrogen is passed into the air guide pipe 4.

[0024] The working principle of the present invention is to introduce coolant into the cooling pipe 10 to pre-cool the condenser 1, then introduce gaseous 1,4-butyrolactone into the condenser 1 through the air inlet 5, then start the reduction motor 2, drive the rotating shaft 3 to rotate, and drive the fan blade 16 to rotate, and at the same time introduce cooling nitrogen into the air guide pipe 4, and the temperature of the cooling nitrogen and the coolant can be controlled in the range of -40 to 0°C; in this way, most of the gaseous 1,4-butyrolactone entering the condenser 1 is blown to the inner wall 8 of the shell of the condenser 1 by the fan blade 16, and under the guiding action of the spiral guide plate 13, it contacts the inner wall 8 of the shell and is condensed. The nitrogen gas is converted into liquid and flows down the through groove 14 of the spiral guide plate 13 and gathers in the lower hopper below. A small amount of gaseous 1,4-butyrolactone may remain in the center of the condenser 1, that is, near the rotating shaft 3. After the cooling nitrogen is ejected from the air guide hole 17 of the rotating shaft 3, this part of the gaseous 1,4-butyrolactone can be cooled. Since nitrogen is an inert gas and is difficult to dissolve in liquid 1,4-butyrolactone, the gaseous 1,4-butyrolactone is liquefied and drips down, while the nitrogen after heat exchange is discharged from the gas outlet. Finally, the discharge valve 7 is opened to discharge the liquid 1,4-butyrolactone in the lower hopper.

[0025] While the embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A condensing device for GBL production, comprising a condensing tank, a reduction motor, a rotating shaft, and an air guide pipe, characterized in that: The top of the condensing tank is provided with an air inlet and an air outlet, the bottom of the condensing tank is provided with a lower hopper, and the bottom of the lower hopper is provided with a discharge port, the condensing tank is provided with a shell inner wall and a shell outer wall, and a heat exchange cavity for cooling is formed between the shell inner wall and the shell outer wall, a cooling pipe is provided in the heat exchange cavity, the cooling pipe is coiled on the outside of the shell inner wall of the condensing tank, one end of the cooling pipe is provided with a coolant inlet, and the other end is provided with a coolant outlet, and the coolant inlet and the coolant outlet both pass through the shell outer wall of the condensing tank and extend outward, a spiral guide plate is fixedly provided on the inside of the shell inner wall of the condensing tank, and the spiral guide plate is fixed on the inside of the shell inner wall of the condensing tank. A through slot is provided on the guide plate, the reduction motor is arranged on the outside of the condensation tank, the rotating shaft is vertically arranged inside the condensation tank, the top end of the rotating shaft passes through the condensation tank and is connected to the output shaft of the reduction motor through a bevel gear transmission pair, an opening is provided on the top of the rotating shaft, and an air intake cavity connected to the opening is provided inside the rotating shaft, a number of fan blades are provided at the lower end of the rotating shaft, and a plurality of air guide holes connected to the air intake cavity are provided at the lower end of the rotating shaft, the air guide pipe is provided above the condensation tank, one end of the air guide pipe downwardly penetrates into the air intake cavity of the rotating shaft, and the outer wall of the air guide pipe and the inner wall of the rotating shaft are sealed and rotatably connected.

2. The condensing device for GBL production according to claim 1, characterized in that: An exhaust valve is provided at the air outlet of the condensation tank.

3. The condensing device for GBL production according to claim 2, characterized in that: A discharge valve is provided at the discharge port of the condensation tank.

4. The condensing device for GBL production according to claim 3, characterized in that: Support legs are provided below the condensation tank.

5. The condensing device for GBL production according to claim 4, characterized in that: The bevel gear transmission pair includes a meshing horizontal bevel gear and a vertical bevel gear. The horizontal bevel gear is fixedly sleeved on the outside of the upper end of the rotating shaft, and the vertical bevel gear is installed on the output shaft of the reduction motor.

6. The condensing device for GBL production according to claim 5, characterized in that: Inert cooling gas is introduced into the air duct, and the inert cooling gas is cooling nitrogen.

7. The condensing device for GBL production according to claim 6, characterized in that: The fan blades on the rotating shaft do not interfere with the spiral guide plate.

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