A low boiling point organic solvent recovery device

Abstract

The utility model discloses a low-boiling-point organic solvent recovery device, comprising a solvent recovery tank, a second organic solvent having a higher boiling point than a first organic solvent is contained in the solvent recovery tank, a pipe body for passing the first organic solvent in a vapor state into the second organic solvent is arranged on the solvent recovery tank, and a vacuum pump is connected to the upper end of the solvent recovery tank. In the utility model, the second organic solvent with a higher boiling point in the solvent recovery tank can absorb the first organic solvent in a vapor state with a lower boiling point to form a blended solution and promote the recovery of the low-boiling-point organic solvent, and can indirectly increase the boiling point of the low-boiling-point organic solvent to slow down the rate of being decompressed and vaporized again in the solvent recovery tank, thereby reducing the content of the organic solvent in a vapor state output to the vacuum pump, thereby achieving the purpose of protecting the rear-end vacuum pump and the environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic solvent recovery, in particular to a low boiling point organic solvent recovery device. Background Art

[0002] In the production process of the pharmaceutical chemical industry, a large amount of organic solvents are usually used as reaction carriers, and most production processes use low-boiling and easily volatile organic solvents, which results in a large amount of organic solvent vapor in the production system. At present, the solvent recovery device on the market usually directly introduces the low-boiling point organic solvent vapor in the production system into the recovery device through a vacuum pump, and condenses and recovers the organic solvent vapor in the recovery device by cooling it.

[0003] However, this method cannot guarantee that the organic solvent is completely recovered and absorbed, and the organic solvent vapor that is not recovered and absorbed will enter the atmosphere through the vacuum pump, which not only causes solvent waste, but also pollutes the environment and sometimes damages the vacuum pump. Utility Model Content

[0004] In order to overcome the defects of the prior art, the utility model provides a low-boiling point organic solvent recovery device, which can promote the recovery of the low-boiling point organic solvent.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A low boiling point organic solvent recovery device comprises a solvent recovery tank, in which a second organic solvent having a higher boiling point than a first organic solvent is contained, a pipe body for passing the first organic solvent in a vapor state into the second organic solvent is arranged on the solvent recovery tank, and the upper end of the solvent recovery tank is connected to a vacuum pump.

[0007] The beneficial effects of adopting the above technical scheme are as follows: the second organic solvent with a higher boiling point in the solvent recovery tank can absorb the vapor-state first organic solvent with a lower boiling point to form a blended solution and promote the recovery of the low-boiling-point organic solvent, and can indirectly increase the boiling point of the low-boiling-point organic solvent to slow down the rate of re-vaporization under reduced pressure in the solvent recovery tank, thereby reducing the content of the vapor-state organic solvent output to the vacuum pump, thereby achieving the purpose of protecting the rear-end vacuum pump and the environment.

[0008] In one embodiment, a cooling liquid circulation system is provided on the solvent recovery tank.

[0009] The beneficial effect of adopting the above technical solution is that the coolant circulation system can cool the solvent recovery tank to keep the entire solvent recovery tank in a low temperature state, thereby solving the problem that the first organic solvent recovered under normal temperature and reduced pressure conditions is drawn away due to re-vaporization, thereby further reducing the content of the organic solvent in the terminal vapor state.

[0010] In one embodiment, the cooling liquid circulation system includes a cooling liquid cavity disposed in the solvent recovery tank body, a cooling liquid inlet for inputting cooling liquid into the cooling liquid cavity, and a cooling liquid outlet for outputting cooling liquid in the cooling liquid cavity.

[0011] The beneficial effect of adopting the above technical solution is that the coolant is input into the coolant cavity through the coolant inlet and discharged from the coolant outlet to take out the heat in the solvent recovery tank, thereby keeping the entire solvent recovery tank at a low temperature.

[0012] In one embodiment, an annular filter immersed in the second organic solvent is disposed in the solvent recovery tank, the annular filter is provided with a plurality of holes for forming bubbles from the vapor first organic solvent, and the output end of the tube body faces the annular filter.

[0013] The beneficial effect of adopting the above technical solution is that when the tube body transports the vapor-state first organic solvent from the output end to the annular filter, the vapor-state first organic solvent is bubbled due to the action of the pores on the annular filter, so that the contact absorption area is increased, which is conducive to promoting the absorption of the low-boiling point first organic solvent.

[0014] In one embodiment, the low-boiling point organic solvent recovery device includes a vacuum buffer tank, the upper portion of which is provided with an input port for inputting a vapor-state first organic solvent and an output port for outputting a vapor-state first organic solvent, and the output port is connected to the input end of the tube body.

[0015] The beneficial effect of adopting the above technical solution is: the vapor state first organic solvent passes through the input port, the vacuum buffer tank and the output port in sequence and then is discharged from the pipe body into the solvent recovery tank, so that the vapor state first organic solvent is first cooled down in the vacuum buffer tank, thereby avoiding the problem of reduced condensation efficiency caused by the possibly high-temperature vapor state first organic solvent directly entering the solvent recovery tank.

[0016] In one embodiment, a first pressure gauge is provided on the vacuum buffer tank; and / or

[0017] The vacuum buffer tank is provided with a first pressure relief valve.

[0018] The beneficial effect of adopting the above technical solution is: such a setting makes it easy to understand the pressure situation in the vacuum buffer tank, and to release the pressure in time when the pressure in the vacuum buffer tank is too high, so as to improve safety performance.

[0019] In one embodiment, a second pressure gauge is provided on the solvent recovery tank; and / or

[0020] A second pressure relief valve is provided on the solvent recovery tank.

[0021] The beneficial effect of adopting the above technical solution is that such an arrangement makes it easy to understand the pressure situation in the solvent recovery tank, and to release the pressure in time when the pressure in the solvent recovery tank is too high, so as to improve the safety performance.

[0022] In one embodiment, a spiral heat exchanger is connected between the upper end of the solvent recovery tank and the vacuum pump.

[0023] The beneficial effect of adopting the above technical solution is that the spiral heat exchanger can further cool and recover the vapor-state first organic solvent that is vaporized due to reduced pressure and not absorbed.

[0024] In one embodiment, the input end of the pipe body is disposed through the upper portion of the solvent recovery tank.

[0025] In one embodiment, a viewing window is provided on the solvent recovery tank.

[0026] The beneficial effect of adopting the above technical solution is that such an arrangement makes it convenient to observe the situation in the solvent recovery tank through the visual window.

[0027] The beneficial effects of the utility model are:

[0028] The second organic solvent with a higher boiling point in the solvent recovery tank can absorb the vapor-state first organic solvent with a lower boiling point to form a blended solution and promote the recovery of the low-boiling-point organic solvent, and can indirectly increase the boiling point of the low-boiling-point organic solvent to slow down the rate of re-vaporization under reduced pressure in the solvent recovery tank, thereby reducing the content of the vapor-state organic solvent output to the vacuum pump, thereby achieving the purpose of protecting the rear-end vacuum pump and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0030] in:

[0031] Figure 1 The schematic diagram of the structure of the utility model is shown;

[0032] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0033] Reference numerals:

[0034] 1-solvent recovery tank, 2-vacuum buffer tank, 3-inlet, 4-first pressure relief valve, 5-first pressure gauge, 6-outlet, 7-tube body, 8-spiral heat exchanger, 9-second pressure gauge, 10-second pressure relief valve, 11-visible window, 12-second organic solvent, 13-annular filter. DETAILED DESCRIPTION

[0035] The utility model will be further described below in conjunction with the accompanying drawings.

[0036] The utility model provides a low boiling point organic solvent recovery device, such as Figure 1 As shown, it includes a solvent recovery tank 1, which contains a second organic solvent 12 having a higher boiling point than the first organic solvent. The solvent recovery tank 1 is provided with a pipe body 7 for passing the vapor state of the first organic solvent into the second organic solvent 12, and the upper end of the solvent recovery tank 1 is connected to a vacuum pump.

[0037] It can be understood that the second organic solvent 12 with a higher boiling point in the solvent recovery tank 1 can absorb the vapor-state first organic solvent with a lower boiling point to form a blended solution and promote the recovery of the low-boiling-point organic solvent, and can indirectly increase the boiling point of the low-boiling-point organic solvent to slow down the rate of re-decompression vaporization in the solvent recovery tank 1, thereby reducing the content of the vapor-state organic solvent output to the vacuum pump, thereby achieving the purpose of protecting the rear-end vacuum pump and the environment.

[0038] It should be noted that the first organic solvent is a low boiling point organic solvent, and the second organic solvent 12 is a high boiling point organic solvent.

[0039] In one embodiment, a cooling liquid circulation system is provided on the solvent recovery tank 1 .

[0040] It can be understood that the coolant circulation system can cool the solvent recovery tank 1 to keep the entire solvent recovery tank 1 in a low temperature state, so as to solve the problem that the first organic solvent recovered under normal temperature and reduced pressure conditions is drawn away due to re-vaporization, thereby further reducing the content of the terminal vapor state organic solvent.

[0041] In one embodiment, the cooling liquid circulation system includes a cooling liquid cavity arranged in the tank body of the solvent recovery tank 1, a cooling liquid inlet for inputting cooling liquid into the cooling liquid cavity, and a cooling liquid outlet for outputting cooling liquid in the cooling liquid cavity.

[0042] It can be understood that the coolant is input into the coolant cavity through the coolant inlet and discharged from the coolant outlet to take out the heat in the solvent recovery tank 1, so that the entire solvent recovery tank 1 is kept at a low temperature.

[0043] In one embodiment, an annular filter 13 immersed in the second organic solvent 12 is provided in the solvent recovery tank 1 , and a plurality of micropores are provided on the annular filter 13 for forming bubbles in the vapor state of the first organic solvent. The output end of the tube 7 faces the annular filter 13 .

[0044] It is understandable that when the tube body 7 transports the vaporous first organic solvent from the output end to the annular filter 13, the vaporous first organic solvent is bubbled due to the pores on the annular filter 13, so that the contact absorption area is increased, which is conducive to promoting the absorption of the low-boiling point first organic solvent.

[0045] In one embodiment, the low-boiling point organic solvent recovery device includes a vacuum buffer tank 2, and the upper part of the vacuum buffer tank 2 is provided with an input port 3 for inputting a vapor-state first organic solvent and an output port 6 for outputting a vapor-state first organic solvent, and the output port 6 is connected to the input end of the pipe body 7.

[0046] It can be understood that the vapor-state first organic solvent passes through the input port 3, the vacuum buffer tank 2 and the output port 6 in sequence and is then discharged from the pipe body 7 into the solvent recovery tank 1, so that the vapor-state first organic solvent is first cooled down in the vacuum buffer tank 2, thereby avoiding the problem of the high-temperature vapor-state first organic solvent directly entering the solvent recovery tank 1 and causing the condensation efficiency to be reduced.

[0047] In one embodiment, a first pressure gauge 5 is provided on the upper portion of the vacuum buffer tank 2 to facilitate understanding of the pressure conditions in the vacuum buffer tank 2; a first pressure relief valve 4 is provided on the upper portion of the vacuum buffer tank 2 to timely relieve pressure when the pressure in the vacuum buffer tank 2 is too high, thereby improving safety performance.

[0048] In one embodiment, a second pressure gauge 9 is provided on the upper part of the solvent recovery tank 1 to facilitate understanding of the pressure situation inside the solvent recovery tank 1; a second pressure relief valve 10 is provided on the upper part of the solvent recovery tank 1 to timely relieve pressure when the internal force of the solvent recovery tank 1 is too large, so as to improve safety performance.

[0049] In one embodiment, a spiral heat exchanger 8 is connected between the upper end of the solvent recovery tank 1 and the vacuum pump.

[0050] It can be understood that the spiral heat exchanger 8 can further cool and recover the vapor-state first organic solvent that is vaporized due to the reduced pressure and is not absorbed.

[0051] It should be noted that heat exchange is performed by passing cooling water into the spiral heat exchanger 8 .

[0052] In one embodiment, the input end of the pipe body 7 is disposed through the upper portion of the solvent recovery tank 1 .

[0053] In one embodiment, a visual window 11 is provided on the solvent recovery tank 1 , so that the situation inside the solvent recovery tank 1 can be conveniently observed through the visual window 11 .

[0054] In addition, the lower ends of the solvent recovery tank 1 and the vacuum buffer tank 2 are both provided with a drain port and a drain valve.

[0055] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0056] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A low boiling point organic solvent recovery device for recovering a first organic solvent in a vapor state, characterized in that: The invention comprises a solvent recovery tank (1), wherein the solvent recovery tank (1) contains a second organic solvent (12) having a higher boiling point than a first organic solvent, and the solvent recovery tank (1) is provided with a pipe body (7) for passing the first organic solvent in a vapor state into the second organic solvent (12), and the upper end of the solvent recovery tank (1) is connected to a vacuum pump.

2. A low boiling point organic solvent recovery device according to claim 1, characterized in that: The solvent recovery tank (1) is provided with a cooling liquid circulation system.

3. A low boiling point organic solvent recovery device according to claim 2, characterized in that: The cooling liquid circulation system comprises a cooling liquid cavity arranged in the tank body of the solvent recovery tank (1), a cooling liquid inlet for inputting cooling liquid into the cooling liquid cavity, and a cooling liquid outlet for outputting cooling liquid in the cooling liquid cavity.

4. A low boiling point organic solvent recovery device according to claim 1, characterized in that: The solvent recovery tank (1) is provided with an annular filter (13) immersed in the second organic solvent (12); the annular filter (13) is provided with a plurality of holes for forming bubbles from the vapor-state first organic solvent; the output end of the tube (7) faces the annular filter (13).

5. A low boiling point organic solvent recovery device according to claim 1, characterized in that: It comprises a vacuum buffer tank (2), wherein the upper part of the vacuum buffer tank (2) is provided with an input port (3) for inputting a first organic solvent in a vapor state and an output port (6) for outputting the first organic solvent in a vapor state, and the output port (6) is connected to the input end of the tube body (7).

6. A low boiling point organic solvent recovery device according to claim 5, characterized in that: The vacuum buffer tank (2) is provided with a first pressure gauge (5); and / or The vacuum buffer tank (2) is provided with a first pressure relief valve (4).

7. A low boiling point organic solvent recovery device according to claim 1, characterized in that: The solvent recovery tank (1) is provided with a second pressure gauge (9); and / or The solvent recovery tank (1) is provided with a second pressure relief valve (10).

8. A low boiling point organic solvent recovery device according to claim 1, characterized in that: A spiral heat exchanger (8) is connected between the upper end of the solvent recovery tank (1) and the vacuum pump.

9. A low boiling point organic solvent recovery device according to claim 1, characterized in that: The input end of the tube body (7) is arranged through the upper part of the solvent recovery tank (1).

10. A low boiling point organic solvent recovery device according to claim 1, characterized in that: The solvent recovery tank (1) is provided with a visual window (11).

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