Stirring paddle and waste organic solvent distillation recovery device

Abstract

The utility model provides a stirring paddle and a waste organic solvent distillation and recovery device, and belongs to the technical field of chemical industry equipment.The waste organic solvent distillation and recovery device specifically comprises a distillation still, the stirring paddle, a tower top condenser, a backflow controller and a fraction receiving tank, the stirring paddle comprises a paddle shaft, at least one pair of paddles and at least one connecting unit, wherein the pair of paddles and the paddle shaft are coaxial, the paddles are symmetrically arranged on the two sides of the paddle shaft through the connecting unit, each paddle is provided with a bent section, and materials in the distillation kettle are lifted to a certain height and uniformly sprayed along the kettle wall through rotation of the stirring paddle in the stirring process, so that the heat exchange area and the evaporation area of the jacketed distillation kettle are increased. Through the design of the stirring paddle, the equipment is simpler, energy is saved, and consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of chemical industrial equipment, and particularly to an agitator paddle and a waste organic solvent distillation and recovery device. Background Art

[0002] At present, solvent recovery mainly adopts the rectification method, and batch rectification is one of the mainstream methods for solvent recovery. It is widely used in solvent recovery systems with complex components. Batch rectification is convenient for timely adjusting parameters such as reflux and temperature, is flexible in use, and can obtain high-purity solvent products. Batch rectification usually uses a 5000L - 10000L jacketed or coil-type vertical kettle, and the height of the kettle is more than 3 meters. Taking a 5000L distillation kettle as an example, the heat exchange area of the jacket is about 12 square meters. When the feed is full, the heat exchange area is 12 square meters. After starting distillation, as the liquid level drops, the liquid contact heat exchange area decreases. When the liquid level drops to 30%, the liquid contact heat exchange area is less than 4 square meters. However, the material in the kettle is about 1 - 2 cubic meters, the heat exchange efficiency drops severely, the evaporation efficiency decreases, and the steam energy consumption increases. As the liquid level continues to drop, the heat transfer amount is insufficient, the evaporation amount cannot maintain the operation of the rectification column, the kettle efficiency decreases, the residual liquid amount increases, and the product yield drops. Utility Model Content

[0003] Therefore, in order to overcome the above-mentioned disadvantages of the prior art, the present utility model provides an agitator paddle and a waste organic solvent distillation and recovery device to solve the problems of insufficient heat transfer amount caused by the drop of the liquid level in the distillation kettle and low evaporation efficiency.

[0004] To achieve the above object, the present utility model provides the following technical solution: An agitator paddle for waste organic solvent distillation and recovery, characterized by comprising:

[0005] A paddle shaft, at least one pair of paddle blades and at least one connecting unit;

[0006] The pair of paddle blades is coplanar with the paddle shaft, and is symmetrically arranged on both sides of the paddle shaft through the connecting unit. The paddle blades are provided with bent sections, and the distance between the upper ends of the pair of paddle blades is greater than the distance between the lower ends.

[0007] Specifically, the opening direction of the bent section provided on the paddle blade is clockwise, and the paddle blade is fixed on the clockwise side of the connecting unit.

[0008] Specifically, the connecting unit is a transverse long shaft.

[0009] Specifically, the agitator paddle includes two connecting units, the connecting units are transverse long shafts, one of which is arranged between the upper ends of the pair of paddle blades, and the other is arranged between the lower ends of the pair of paddle blades.

[0010] Specifically, the connecting unit is a trapezoidal thin plate.

[0011] Specifically, the ratio of the distance between the upper ends formed by the pair of blades to the distance between the lower ends is 2:1 to 4:1.

[0012] Specifically, the bent section is a semi-circular bend, and the diameter of the semi-circle is 1 to 30 cm.

[0013] Specifically, the included angle between the bent section and the axial plane is an acute angle.

[0014] Specifically, the upward opening angle formed by the intersection of the extension lines of the pair of blades is 10° to 170°.

[0015] A waste organic solvent distillation and recovery device includes:

[0016] A distillation kettle for evaporating the waste organic solvent;

[0017] A stirring paddle arranged in the distillation kettle for stirring the waste organic solvent in the distillation kettle;

[0018] A rectifying column, the bottom inlet of which is communicated with the top outlet of the distillation kettle, for rectifying the evaporated waste organic solvent;

[0019] A top condenser, the inlet of which is communicated with the top outlet of the rectifying column, for condensing the rectified waste organic solvent;

[0020] A reflux controller connected to the rectifying column and the top condenser for adjusting the reflux amount of the top condenser;

[0021] A fraction receiving tank connected to the reflux controller for collecting the waste organic solvent after rectification is completed.

[0022] Compared with the prior art, the advantages of the present application are as follows: In the present application, the blades in the stirring paddle are improved to be provided with a bent section, and it is possible to lift the bottom slurry to a certain height and uniformly spray it without setting a horizontal stirring paddle. Moreover, the opening direction of the bent section of the blade is set to be clockwise, and the blade is fixed on the clockwise side of the connecting unit, further improving the efficiency of the stirring paddle in lifting the slurry, increasing the heat exchange area and evaporation area of the distillation kettle, improving the recovery rate of the waste organic solvent, and making the equipment simpler, energy-saving and consumption-reducing. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1is the waste organic solvent distillation and recovery device described in the embodiments of the present application;

[0025] Figure 2 is the stirring paddle described in the embodiments of the present application;

[0026] In the figure: 100, stirring paddle; 200, distillation kettle; 300, stirring motor; 400, rectifying column; 500, top condenser; 600, reflux controller; 700, fraction receiving tank; 101, paddle shaft; 102, upper port connecting long shaft; 103, lower port connecting long shaft; 104, paddle blade. Detailed implementation manners

[0027] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the scope of protection of the present application.

[0029] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0030] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The drawings only show the components related to the present application and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0031] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0032] An embodiment of the present application provides a waste organic solvent distillation and recovery device, including: a stirring paddle, a distillation kettle, a stirring motor, a rectifying column, a top condenser, a reflux controller, and a fraction receiving tank.

[0033] The distillation kettle is used to evaporate the waste organic solvent. When the feed in the distillation kettle reaches the high liquid level with a full volume, distillation starts. As the liquid level in the distillation kettle drops, the liquid contact heat exchange area decreases. When the liquid level drops to a certain extent, the liquid contact heat exchange area is too small, but there is still waste organic solvent in the distillation kettle, the heat exchange efficiency seriously decreases, the evaporation efficiency reduces, the steam energy consumption increases, the liquid level continues to drop, resulting in insufficient heat exchange, the evaporation amount cannot maintain the operation of the rectifying column, the efficiency of the evaporation kettle decreases, the amount of residual liquid increases, and the product yield decreases.

[0034] The stirring paddle is arranged in the distillation kettle and is used to stir the waste organic solvent in the distillation kettle. The stirring motor is arranged above the stirring paddle and is used to drive the stirring paddle to rotate. The stirring paddle includes a paddle shaft, at least a pair of paddle blades, and at least one connecting unit; a pair of paddle blades are coplanar with the paddle shaft and are symmetrically arranged on both sides of the paddle shaft through the connecting unit.

[0035] In one embodiment, the connecting unit can be one, and this connecting unit is a transverse long shaft.

[0036] In one embodiment, the connecting unit can be two, and this connecting unit is a transverse long shaft, one of which is arranged between the upper ends of the pair of paddle blades, and the other is arranged between the lower ends of the pair of paddle blades.

[0037] In one embodiment, the connecting unit can also be a trapezoidal thin sheet.

[0038] The paddle shaft is arranged at the center of the distillation kettle, and the paddle blade is provided with a bent section.

[0039] In one embodiment, the bent section can be a semi-circular bend, and the semi-circular diameter is 1 - 30 cm.

[0040] In one embodiment, the bent section can be an acute angle with the axial plane.

[0041] In one embodiment, the opening direction of the bent section provided on the paddle blade can be the clockwise direction, and the paddle blade is fixed on the clockwise side of the connecting unit.

[0042] In one embodiment, the distance between the upper ends of the pair of blades is greater than the distance between the lower ends, and the ratio of the distance between the upper ends to the distance between the lower ends formed by the pair of blades is 2:1 to 4:1.

[0043] In one embodiment, the upward opening angle formed by the intersection of the extension lines of the pair of blades is 10° to 170°.

[0044] In one embodiment, the ratio of the height of the blade to the height of the distillation kettle is 1:2 to 1:4.

[0045] A rectification column, the bottom inlet of which is communicated with the top outlet of the distillation kettle, is used for rectifying the evaporated waste organic solvent;

[0046] A top condenser, the inlet of which is communicated with the top outlet of the rectification column, is used for condensing the waste organic solvent after rectification;

[0047] A reflux controller, which is connected to the rectification column and the top condenser, is used for adjusting the reflux amount of the top condenser.

[0048] A fraction receiving tank, which is connected to the reflux controller, is used for collecting the waste organic solvent after the rectification is completed.

[0049] The bottom inlet of the rectification column is communicated with the top outlet of the distillation kettle, and the waste organic solvent distilled by the distillation kettle enters the rectification column, and the rectification column rectifies the evaporated waste organic solvent.

[0050] The inlet of the top condenser is communicated with the top outlet of the rectification column, and is used for condensing the waste organic solvent after rectification by the rectification column.

[0051] The reflux controller is connected to the rectification column and the top condenser, and is used for adjusting the reflux amount of the top condenser.

[0052] The fraction receiving tank is connected to the reflux controller, and is used for collecting the waste organic solvent after the rectification by the rectification column is completed.

[0053] During the distillation and recovery process of the waste organic solvent, the distillation kettle distills the waste organic solvent. When the liquid level in the distillation kettle is at the high liquid level, the stirring paddle stirs the waste organic solvent, and the distilled waste organic solution overflows from the top of the distillation kettle and enters the rectification column from the bottom inlet of the rectification column. The rectification column rectifies the waste organic solution, and the waste organic solvent after rectification overflows from the top outlet of the rectification column and enters the top condenser from the inlet of the top condenser. The top condenser condenses the waste organic solvent after rectification, and the reflux controller adjusts the reflux amount of the top condenser. Finally, the waste organic solvent after the rectification is completed flows into the fraction receiving tank for recovery.

[0054] During the distillation and recovery process of waste organic solvents, the liquid level in the distillation kettle continuously drops. When the liquid level in the distillation kettle drops to a certain extent, the stirring motor drives the stirring paddle to rotate at an accelerated speed. Under the action of centrifugal force, the waste organic solvents in the distillation kettle are lifted upward along the blades of the stirring paddle to the upper end of the blades, and the waste organic solvents are evenly sprayed along the distillation kettle, thereby increasing the heat exchange area and evaporation area of the jacketed distillation kettle under the liquid level. The distilled waste organic solution overflows from the top of the distillation kettle and enters the rectifying column from the bottom inlet of the rectifying column. The rectifying column performs rectification treatment on the waste organic solution. The rectified waste organic solvents overflow from the top outlet of the rectifying column and enter the top condenser from the inlet of the top condenser. The top condenser condenses the rectified waste organic solvents, and the reflux controller adjusts the reflux amount of the top condenser. Finally, the rectified waste organic solvents flow into the fraction receiving tank for recovery.

[0055] Example 1

[0056] A waste organic solvent distillation and recovery device, which includes: a stirring paddle 100, a distillation kettle 200, a stirring motor 300, a rectifying column 400, a top condenser 500, a reflux controller 600, and a fraction receiving tank 700.

[0057] The distillation kettle 200 is used to evaporate waste organic solvents, and the capacity of the distillation kettle is 5000L. The jacketed heat exchange area is about 12 square meters. When the feed is full, the heat exchange area is 12 square meters. After starting the distillation, as the liquid level in the distillation kettle 200 drops, the liquid contact heat exchange area decreases. When the liquid level drops to 30%, the liquid contact heat exchange area is less than 4 square meters. However, the material in the distillation kettle 200 is about 1 - 2 cubic meters, the heat exchange efficiency drops severely, the evaporation efficiency decreases, and the steam energy consumption increases. The continuous drop of the liquid level leads to insufficient heat transfer, the evaporation amount cannot maintain the operation of the rectifying column 400, the efficiency of the evaporation kettle 200 decreases, the amount of residual liquid increases, and the product yield decreases.

[0058] The stirring paddle 100 is arranged inside the distillation kettle 200 and is used for stirring the waste organic solvent in the distillation kettle 200. Among them, the stirring motor 300 is arranged above the stirring paddle 100, and the stirring motor 300 is used to drive the stirring paddle 100 to rotate. The stirring paddle 100 includes: a paddle shaft 101, an upper-port connecting long shaft 102, a lower-port connecting long shaft 103, and paddle blades 104. The paddle shaft 101 is arranged at the center of the distillation kettle 200. The shape of the paddle blade 104 is semi-circular. The diameter of the semi-circular paddle blade 104 is 1-30 cm. The opening direction of the semi-circular paddle blade 101 is clockwise. The semi-circular paddle blades 104 are arranged in the clockwise direction of the upper-end connecting long shaft 102 and the lower-end connecting long shaft 103. The upper-end connecting long shaft 102 and the lower-end connecting long shaft 103 symmetrically fix the two paddle blades 104 on both sides of the paddle shaft 101. The upper-port spacing formed by the two paddle blades 104 is greater than the lower-port spacing, and the ratio of the distance between the upper ends to the distance between the lower ends is 3:1. The upper-end connecting long shaft 102 is arranged between the upper ends of the two paddle blades 104, and the lower-end connecting long shaft 103 is arranged between the lower ends of the two paddle blades 104, that is, the length of the upper-end connecting long shaft 102 is greater than the length of the lower-end connecting long shaft 103. The upward-opening angle formed by the extension lines of the two paddle blades 104 on both sides is 170°. The height ratio of the paddle blade 104 to the height of the distillation kettle is 1:3.

[0059] The bottom inlet of the rectifying column 400 is communicated with the top outlet of the distillation kettle 200. The waste organic solvent distilled by the distillation kettle 200 enters the rectifying column 400, and the rectifying column 400 rectifies the evaporated waste organic solvent.

[0060] The inlet of the top condenser 500 is communicated with the top outlet of the rectifying column 400 and is used for condensing the waste organic solvent rectified by the rectifying column 400.

[0061] The reflux controller 600 is connected to the rectifying column 400 and the top condenser 500 and is used to control the reflux amount of the top condenser.

[0062] The fraction receiving tank 700 is connected to the reflux controller 600 and is used to collect the waste organic solvent that has been rectified by the rectifying column 400.

[0063] In the process of distillation and recovery of waste organic solvents, the distillation kettle 200 distills the waste organic solvents. When the liquid level in the distillation kettle 200 is above 30%, the stirring paddle 100 stirs the waste organic solvents. The distilled waste organic solution overflows from the top of the distillation kettle 200 and enters the rectifying tower 400 from the bottom inlet of the rectifying tower 400. The rectifying tower 400 performs rectification treatment on the waste organic solution. The rectified waste organic solvents overflow from the top outlet of the rectifying tower 400 and enter the top condenser 500 from the inlet of the top condenser 500. The top condenser 500 condenses the rectified waste organic solvents. The reflux controller 600 controls the reflux amount of the top condenser. Finally, the rectified waste organic solvents flow into the fraction receiving tank for recovery.

[0064] In the process of distillation and recovery of waste organic solvents, the liquid level in the distillation kettle 200 continuously drops. When the liquid level in the distillation kettle 200 drops to 30%, the stirring motor 300 drives the stirring paddle 100 to rotate at an accelerated speed. Under the action of centrifugal force, the waste organic solvents in the distillation kettle 200 are lifted upward along the semi-circular blade 104 of the stirring paddle 100 to the upper end of the semi-circular blade 104, and the waste organic solvents are evenly sprayed along the distillation kettle 200, thereby increasing the heat exchange area and evaporation area of the jacketed distillation kettle 200 below the liquid level. The distilled waste organic solution overflows from the top of the distillation kettle 200 and enters the rectifying tower 400 from the bottom inlet of the rectifying tower 400. The rectifying tower 400 performs rectification treatment on the waste organic solution. The rectified waste organic solvents overflow from the top outlet of the rectifying tower 400 and enter the top condenser 500 from the inlet of the top condenser 500. The top condenser 500 condenses the rectified waste organic solvents. The reflux controller 600 controls the reflux amount of the top condenser. Finally, the rectified waste organic solvents flow into the fraction receiving tank for recovery.

[0065] As mentioned above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A stirring blade for distilling and recovering waste organic solvents, characterized in that: It includes a propeller shaft, at least one pair of propeller blades and at least one connecting unit. The pair of propeller blades are coaxial with the propeller shaft and are symmetrically arranged on both sides of the propeller shaft through the connecting unit. The propeller blades are provided with bending sections, and the distance between the upper ends of the pair of propeller blades is greater than the distance between the lower ends.

2. The stirring paddle according to claim 1, characterized in that: The opening direction of the bending section of the blade is clockwise, and the blade is fixed on the clockwise side of the connecting unit.

3. The stirring paddle according to claim 1, characterized in that: The connecting unit is a transverse long axis.

4. The stirring paddle according to claim 1, characterized in that: The stirring paddle comprises two connecting units, which are transverse long axes, one of which is arranged between the upper ends of the pair of paddles, and the other is arranged between the lower ends of the pair of paddles.

5. The stirring paddle according to claim 1, characterized in that: The connecting unit is a trapezoidal sheet.

6. The stirring paddle according to claim 1, characterized in that: The ratio of the distance between the upper ends and the distance between the lower ends formed by the pair of blades is 2:1 to 4:

1.

7. The stirring paddle according to claim 1, characterized in that: The bending section is semicircular and has a semicircular diameter of 1 to 30 cm.

8. The stirring paddle according to claim 1, characterized in that: The angle between the bending section and the axial plane is an acute angle.

9. The stirring paddle according to claim 1, characterized in that: The upward opening angle formed by the intersection of the extended lines of the pair of blades is 10° to 170°.

10. A waste organic solvent distillation recovery device, characterized in that: include: a distillation kettle, used for evaporating the waste organic solvent; A stirring paddle is disposed in the distillation kettle and is used to stir the waste organic solvent in the distillation kettle; a distillation tower, the bottom inlet of which is connected to the top outlet of the distillation kettle, for distilling and evaporating the waste organic solvent; A tower top condenser, the inlet of which is connected to the top outlet of the distillation tower, and is used to condense the waste organic solvent after distillation; A reflux controller, connected to the distillation tower and the top condenser, for adjusting the reflux amount of the top condenser; A fraction receiving tank, connected to the reflux controller, for collecting the waste organic solvent after distillation; Wherein, the stirring paddle is based on the stirring paddle according to any one of claims 1-9.

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