CN117959740A

CN117959740A - Heat pump type rectifying system for producing pseudocumene

Info

Publication number: CN117959740A
Application number: CN202410298544.4A
Authority: CN
Inventors: 张传开; 李五一; 张志华; 杨海斌
Original assignee: Anqing Yicheng Chemical Technology Co ltd
Current assignee: Anqing Yicheng Chemical Technology Co ltd
Priority date: 2024-03-15
Filing date: 2024-03-15
Publication date: 2024-05-03

Abstract

The invention discloses a heat pump type rectifying system for producing pseudocumene, which comprises a rectifying tower, a falling film evaporator, an evaporation condenser, a vapor compressor and a hot water buffer tank, wherein the vapor compressor is respectively communicated with the falling film evaporator and the evaporation condenser, the hot water buffer tank is communicated with the hot water circulator, the hot water circulator is communicated with the evaporation condenser through a liquid outlet pipe, a pair of isolation plates are arranged at the bottom of the evaporation condenser so as to divide the interior of a main tank body into three independent chambers, namely an upper independent chamber, a middle independent chamber, a lower independent chamber, a middle independent chamber and a lower independent chamber, of a gas-phase chamber, a heat exchange chamber and a liquid injection chamber, the hot water circulator comprises a transmission component and a liquid flow chamber, the liquid flow chamber is respectively communicated with the hot water buffer tank and the liquid injection chamber through a liquid inlet pipe and a liquid outlet pipe, the transmission component comprises a stand-up chamber, a pneumatic cylinder and a hydraulic cylinder, the pneumatic cylinder is communicated with the stand-up chamber and the liquid flow chamber, and a transmission piece is clamped and installed in the stand-up chamber.

Description

Heat pump type rectifying system for producing pseudocumene

Technical Field

The invention relates to the technical field of pseudocumene production, in particular to a heat pump type rectification system for pseudocumene production.

Background

The trimellite is insoluble in water, miscible in acetone, petroleum ether, and soluble in ethanol, diethyl ether, benzene and other organic solvents, and is mainly used in organic synthesis and pharmaceutical industry, and is an important chemical raw material.

The trimellitic benzene is mainly prepared from nine-carbon aromatic hydrocarbon by adopting a differential pressure thermal coupling rectification method for industrial production, and the purity of the trimellitic benzene can reach more than 99 percent. Most of the gas phase at the top of the tower of the pseudocumene is directly discharged, cooled and received in the existing rectifying process, meanwhile, the material at the bottom of the tower is required to be circulated to a reboiler for repeated heating, the waste heat of the gas phase at the top of the tower in the system is wasted, the waste heat is difficult to be used in the system in the prior art, the efficiency and the capability of waste heat recovery are low, and the energy and the cost waste of the pseudocumene production are caused.

Disclosure of Invention

In order to solve the problems mentioned in the background art, the present invention provides a heat pump type rectification system for producing pseudocumene.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The heat pump type rectifying system for producing the pseudocumene comprises a rectifying tower, a falling film evaporator, an evaporative condenser, a vapor compressor and a hot water buffer tank, wherein the top of the rectifying tower is communicated with the evaporative condenser, the vapor compressor is respectively communicated with the falling film evaporator and the evaporative condenser, the hot water buffer tank is communicated with a hot water circulator, the hot water circulator is communicated with the evaporative condenser through a liquid outlet pipe, and a pair of isolation plates are arranged at the bottom of the evaporative condenser so as to divide the interior of a main tank body into an upper independent chamber, a middle independent chamber, a lower independent chamber and a liquid injection chamber;

The hot water circulator comprises a transmission component and a liquid flow chamber, the liquid flow chamber is communicated with the hot water buffer tank and the liquid injection cavity through a liquid inlet pipe and a liquid outlet pipe respectively, the transmission component comprises a stand room, a pneumatic cylinder and a hydraulic cylinder, the pneumatic cylinder is communicated with the stand room and the gas phase cavity, the hydraulic cylinder is communicated with the stand room and the liquid flow chamber, a transmission part is clamped and installed in the stand room, a pneumatic piston is arranged in the pneumatic cylinder, a hydraulic piston is arranged in the hydraulic cylinder, and the pneumatic piston and the hydraulic piston are respectively connected with the transmission part through connecting rods.

Preferably, when the pneumatic piston is positioned at the position closest to the main tank body, the connecting rod pulls the transmission piece to rotate so as to drive the hydraulic piston to move to the position farthest from the liquid flow chamber.

Preferably, the port of the liquid inlet pipe leading into the liquid flow chamber is provided with a first one-way valve, and the first one-way valve controls the fluid to flow unidirectionally from the liquid inlet pipe to the liquid flow chamber.

Preferably, the port of the outlet pipe communicating with the liquid flow chamber is provided with a second one-way valve which controls the flow of fluid from the liquid flow chamber to the liquid injection cavity only.

Preferably, the vapor compressor comprises a compression tank, a gas compressing piece, a gas inlet one-way valve and at least one gas outlet one-way valve, wherein the compression tank is provided with a compression cavity and a gas outlet cavity, and the gas outlet cavity is arranged on the outer layer of the compression cavity.

Preferably, the compression cavity is communicated with the exhaust cavity through an outlet check valve, and the inlet check valve is communicated with the gas phase cavity and the compression cavity.

Preferably, the gas inlet one-way valve controls the gas in the gas phase cavity to flow unidirectionally to the compression cavity when reaching a preset pressure, and the gas outlet one-way valve controls the gas in the compression cavity to be unidirectionally discharged to the discharge cavity when reaching the preset pressure.

Preferably, the air compressing piece is arranged in the compression cavity, and the air compressing piece is arranged at one side far away from the air inlet one-way valve and the air outlet one-way valve.

Compared with the prior art, the invention has the beneficial effects that:

1. the rectification system fully utilizes the waste heat of the production process, comprehensively utilizes the waste heat, reduces waste of the waste heat, saves the use cost of the gas boiler, reduces the carbon emission to the environment while saving energy and reducing consumption, and protects the environmental resources.

2. The extraction and circulation of the heat exchange liquid is driven by the hot water circulator, the hot water circulator is driven by the steam pressure in the evaporative condenser, the system not only fully utilizes the redundant heat energy generated by the production process, but also converts a part of heat energy into the kinetic energy for driving the heat exchange liquid to flow through the air pressure, and the hot water circulator can work without additional energy supply, so that the setting and running cost of the system is further reduced.

3. The temperature and pressure of the steam generated by the hot water circulator can be reduced after the steam does work outwards, so that more heat can be replaced again to reach the temperature and pressure required for extracting the pressure, the heat replaced by the hot water circulator with unit volume is higher, the power required by a matched steam compressor is reduced, the redundant heat energy generated by the system application process is used as a heat source of tower kettle materials and a power source of the hot water circulator, and the hot water circulator can convert the heat with higher efficiency.

4. The falling film evaporator is provided with the plurality of liquid leakage openings and the spiral cover which are spirally arranged, the allowable downstream flow speed of each liquid leakage opening is the same and fixed, tower kettle materials with different flow speeds can be discharged from the liquid leakage openings together only through different numbers of liquid leakage openings after being injected into the falling film evaporator, the inner wall of the falling film pipe corresponding to each liquid leakage opening can be well formed, the number of the materials required to pass through the liquid leakage opening can be regulated and controlled in real time when the flow speed of the tower kettle materials changes, the feed quantity of the tower kettle materials can not cause the liquid film of the falling film pipe to flow or be piled up, and the evaporation effect of the falling film evaporator is effectively ensured.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a heat pump type rectification system for producing pseudocumene according to the present invention under a viewing angle;

FIG. 2 is a schematic diagram of a heat pump rectification system for use in the production of pseudocumene according to the present invention at another viewing angle;

FIG. 3 is a cross-sectional view of a hot water circulator and an evaporative condenser according to the present invention;

FIG. 4 is a cross-sectional view of a vapor compressor according to the present invention;

FIG. 5 is a schematic cross-sectional view of the top end of the falling film evaporator according to the present invention;

Fig. 6 is a detailed cross-sectional view of a weeping plate of a falling film evaporator according to the present invention.

In the figure: 1. a rectifying tower; 2. a falling film evaporator; 201. a material injection bin; 202. a heat exchange bin; 203. a liquid leakage port; 21. a liquid leakage plate; 22. a screw cap; 23. a falling film tube; 24. a guide block; 25. a diversion end; 26. a dividing plate; 3. an evaporative condenser; 301. a gas phase chamber; 302. a heat exchange cavity; 303. a liquid injection cavity; 31. a partition plate; 32. a main tank body; 33. a heat exchange tube; 4. a vapor compressor; 401. a compression chamber; 402. an exhaust chamber; 41. a compression tank; 42. a gas compressing member; 43. an air inlet one-way valve; 44. an air outlet one-way valve; 5. a hot water buffer tank; 6. a hot water circulator; 61. a transmission assembly; 611. a erecting room; 612. an air pressure cylinder; 613. a hydraulic cylinder; 614. a transmission member; 615. a pneumatic piston; 616. a hydraulic piston; 62. a liquid flow chamber; 63. a first one-way valve; 64. a second one-way valve; 7. a liquid inlet pipe; 8. and a liquid outlet pipe.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-6, a heat pump type rectification system for producing pseudocumene comprises a rectification tower 1, a falling film evaporator 2, an evaporation condenser 3, a vapor compressor 4 and a hot water buffer tank 5, wherein the top gas phase of the rectification tower 1 is introduced into the evaporation condenser 3 for heat exchange so as to convert hot water in the evaporation condenser 3 into low-pressure steam, the low-pressure steam is compressed into high-pressure steam by the vapor compressor 4 and then is conveyed to the falling film evaporator 2 so as to exchange heat with tower kettle materials conveyed to the falling film evaporator 2, hot water obtained by cooling and liquefying after the heat exchange of the high-pressure steam is received by the hot water buffer tank 5, and the hot water is conveyed to the evaporation condenser 3 by the hot water circulator 6 so as to establish heat exchange medium circulation.

The falling film evaporator 2 top has annotates feed bin 201, carry out the separation by weeping board 21 between annotating the heat transfer storehouse 202 of feed bin 201 and below, a plurality of weeping mouths 203 have been laid along the spiral route to weeping board 21, weeping board 21 upper surface is provided with spiral cover 22, spiral cover 22 covers every weeping mouth 203, and will the upper portion space of weeping mouth 203 is sealed, the spiral center of spiral cover 22 is held and is linked together with the tower cauldron material conveying pipeline of rectifying column 1, can be distributed to each weeping mouth 203 and downstream after the tower cauldron material of rectifying column 1 is carried to the cavity that spiral cover 22 and weeping board 21 formed.

The lower surface of the liquid leakage plate 21 is provided with a falling film pipe 23 corresponding to each liquid leakage opening 203, and the inner diameter of the falling film pipe 23 is the same as that of the liquid leakage opening 203, so that tower kettle materials flowing downwards from the inner wall of the liquid leakage opening 203 can be smoothly received by the inner wall of the falling film pipe 23 to form a liquid film.

The top plate of the screw cap 22 is provided with a guide block 24 at a position corresponding to each liquid leakage opening 203, the guide block 24 is extended downwards from the top plate of the screw cap 22 to the liquid leakage openings 203, and the lower end of the guide block 24 is provided with a guide end 25 extending into the liquid leakage openings 203 and having an outer diameter close to the inner diameter of the liquid leakage openings 203 so as to guide tower materials to the inner wall of the liquid leakage openings 203 to form a liquid film on the inner wall of the falling film pipe 23.

The upper surface of the liquid leakage plate 21 is further provided with a plurality of partition plates 26, two sides of each partition plate 26 are connected with the inner side wall of the spiral cover 22, a space exists between the upper end of each partition plate 26 and the top plate of the spiral cover 22, a liquid leakage port 203 is formed between every two partition plates 26, so that a liquid storage space is formed above each liquid leakage port 203, and only after the liquid storage space divided by the previous partition plate 26 is filled with tower materials, the tower materials can flow to the next liquid storage space from the space between the partition plate 26 and the top plate of the spiral cover 22, and the cross section area of the space between the partition plate 26 and the top plate of the spiral cover 22 is larger than the cross section area of the space between the bottom of the diversion end 25 and the inner wall of the liquid leakage port 203, so that the liquid can flow to the next liquid storage space preferentially after the previous liquid storage space is filled.

The hot water buffer tank 5 stores heat exchange liquid, the heat exchange liquid in the hot water buffer tank 5 can flow into the hot water circulator 6 through the liquid inlet pipe 7, and the hot water circulator 6 conveys the heat exchange liquid to the evaporative condenser 3 through the liquid outlet pipe 8.

The bottom of the evaporation condenser 3 is provided with a pair of isolation plates 31, the periphery of the isolation plates 31 is connected with the inner peripheral wall of a main tank body 32 of the evaporation condenser 3, so that the inside of the main tank body 32 is divided into three independent chambers, namely a gas phase chamber 301, a heat exchange chamber 302 and a liquid injection chamber 303, a plurality of heat exchange pipes 33 are vertically arranged between the isolation plates 31, and the upper ends and the lower ends of the heat exchange pipes 33 respectively penetrate through the two isolation plates 31, so that the gas phase chamber 301 is communicated with the liquid injection chamber 303.

The hot water circulator 6 comprises a transmission assembly 61 and a liquid flow chamber 62, the liquid inlet pipe 7 is led into the liquid flow chamber 62, a first one-way valve 63 is arranged at the port of the liquid inlet pipe 7, which is led into the liquid flow chamber 62, and the first one-way valve 63 controls heat exchange liquid to flow unidirectionally from the liquid inlet pipe 7 to the liquid flow chamber 62; the liquid outlet pipe 8 is communicated with the liquid flow chamber 62 and the liquid injection cavity 303, a second one-way valve 64 is arranged at a port, communicated with the liquid flow chamber 62, of the liquid outlet pipe 8, and the second one-way valve 64 controls fluid to flow from the liquid flow chamber 62 to the liquid injection cavity 303 only.

The transmission assembly 61 comprises an erecting chamber 611, a pneumatic cylinder 612 and a hydraulic cylinder 613, wherein the pneumatic cylinder 612 is communicated with the erecting chamber 611 and the gas phase cavity 301, the hydraulic cylinder 613 is communicated with the erecting chamber 611 and the liquid flow chamber 62, a transmission piece 614 is arranged in the erecting chamber 611 in a clamped mode, a pneumatic piston 615 is arranged in the pneumatic cylinder 612, a hydraulic piston 616 is arranged in the hydraulic cylinder 613, and the pneumatic piston 615 and the hydraulic piston 616 are respectively connected with the transmission piece 614 through connecting rods.

When the pneumatic piston 615 is positioned closest to the main tank 32, the connecting rod pulls and rotates the transmission member 614 to drive the hydraulic piston 616 to move to a position farthest from the liquid flow chamber 62, and when the pneumatic piston 615 moves to approach the standing chamber 611, the connecting rod pulls and rotates the transmission member 614 to drive the hydraulic piston 616 to move to the liquid flow chamber 62, so that the heat exchange liquid in the liquid flow chamber 62 is pressed into the liquid injection cavity 303 and each heat exchange tube 33.

The top gas phase of the rectifying tower 1 is introduced into the heat exchange cavity 302 so as to heat and gasify the heat exchange liquid in the heat exchange tube 33 and the liquid injection cavity 303, the gasified steam of the heat exchange liquid is dissipated to the gas phase cavity 301 so as to enable the gas pressure of the gas phase cavity 301 to rise until the gas pressure is larger than the gas pressure in the standing cavity 611, at the moment, the gas pressure in the gas phase cavity 301 pushes the gas pressure piston 615 to move towards the standing cavity 611, so that the heat exchange liquid in the liquid flow chamber 62 is pressed into the liquid injection cavity 303, and the gas pressure in the gas phase cavity 301 is further raised due to the gasification of the heat exchange liquid injected by the liquid injection cavity 303, so that the gas pressure piston 615 is pushed to move until the position closest to the standing cavity 611 is continuously pushed.

The vapor compressor 4 comprises a compression tank 41, a gas compressing piece 42, a gas inlet one-way valve 43 and at least one gas outlet one-way valve 44, the compression tank 41 is provided with a compression cavity 401 and a gas outlet cavity 402, the gas outlet cavity 402 is positioned on the outer layer of the compression cavity 401, the compression cavity 401 is communicated with the gas outlet cavity 402 through the gas outlet one-way valve 44, the gas outlet one-way valve 44 controls the gas in the compression cavity 401 to be discharged to the gas outlet cavity 402 in a one-way mode when the preset pressure is reached, the gas inlet one-way valve 43 is communicated with the gas phase cavity 301 and the compression cavity 401, and controls the gas in the gas phase cavity 301 to flow to the compression cavity 401 in a one-way mode when the preset pressure is reached.

The air compressing member 42 is installed in the compression cavity 401, the air compressing member 42 is located at one side of the compression cavity 401 far away from the air inlet one-way valve 43 and the air outlet one-way valve 44, when the piston of the air compressing member 42 moves far away from the air inlet one-way valve 43, the air in the gas phase cavity 301 can be pumped into the compression cavity 401, so that the air pressure in the gas phase cavity 301 is reduced, at the moment, the piston of the air compressing member 42 moves towards the air outlet one-way valve 44 again to compress and boost the air in the compression cavity 401 until reaching the exhaust pressure of the air outlet one-way valve 44, at the moment, the high-pressure steam meeting the pressure requirement enters the exhaust cavity 402 and is discharged into the main tank body 32 through a pipeline, and after heat exchange and cooling with the falling film pipe 23, the high-pressure steam is discharged to the hot water buffer tank 5.

The piston of the air compressing member 42 continuously reciprocates to continuously pump out and reduce the pressure of the air in the air phase cavity 301 until the air pressure in the erecting chamber 611 is greater than the air pressure in the air phase cavity 301, at this time, the pressure difference between the erecting chamber 611 and the air phase cavity 301 pushes the air pressure piston 615 to move towards the main tank 32, and the connecting rod pulls the transmission member 614 to rotate to drive the hydraulic piston 616 to move towards the liquid flow chamber 62, so that the heat exchange liquid in the hot water buffer tank 5 is pumped into the liquid flow chamber 62.

It can be understood that the operation of the air compressing member 42 is intermittent, and the heat exchange liquid remained in the liquid injecting cavity 303 is still heated and gasified continuously when the air compressing member 42 is operated, but the air pressure in the air phase cavity 301 is reduced at a speed far greater than the speed increased by the gasification of the heat exchange liquid due to the operation of the air compressing member 42, which causes the air pressure in the air phase cavity 301 to be rapidly reduced, so that the hot water circulator 6 can complete the liquid pumping operation of the hot water buffer tank 5; after the air compressor 42 stops working, the air pressure in the gas phase cavity 301 will be continuously increased due to the vaporization of the heat exchange liquid remained in the liquid injection cavity 303, so that the hot water circulator 6 continuously injects the extracted heat exchange liquid into the liquid injection cavity 303.

Preferably, the driver 614 is only opened one hundred eighty degrees of rotation to avoid the connecting rods to which the pneumatic piston 615 and the hydraulic piston 616 are connected from interleaving as they rotate to hinder the driving rotation of the driver 614.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The control mode of the invention is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the supply of power also belongs to common knowledge in the art, and the invention is mainly used for protecting a mechanical device, so the invention does not explain the control mode and circuit connection in detail.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims

1. The utility model provides a heat pump type rectifying system for pseudocumene production, includes rectifying column (1), falling film evaporator (2), evaporative condenser (3), vapor compressor (4) and hot water buffer tank (5), rectifying column (1) top of the tower intercommunication evaporative condenser (3), vapor compressor (4) communicate falling film evaporator (2) and evaporative condenser (3) respectively, its characterized in that:

The hot water buffer tank (5) is communicated with the hot water circulator (6), the hot water circulator (6) is communicated with the evaporative condenser (3) through a liquid outlet pipe (8), and a pair of isolation plates (31) are arranged at the bottom of the evaporative condenser (3) so as to divide the interior of the main tank body (32) into three independent chambers, namely an upper independent chamber, a middle independent chamber, a lower independent chamber, a gas-phase chamber (301), a heat exchange chamber (302) and a liquid injection chamber (303);

The hot water circulator (6) comprises a transmission assembly (61) and a liquid flow chamber (62), the liquid flow chamber (62) is communicated with a hot water buffer tank (5) and a liquid injection cavity (303) through a liquid inlet pipe (7) and a liquid outlet pipe (8) respectively, the transmission assembly (61) comprises a standing chamber (611), a pneumatic cylinder (612) and a hydraulic cylinder (613), the pneumatic cylinder (612) is communicated with the standing chamber (611) and the gas phase cavity (301), the hydraulic cylinder (613) is communicated with the standing chamber (611) and the liquid flow chamber (62), a transmission piece (614) is clamped and installed in the standing chamber (611), a pneumatic piston (615) is arranged in the pneumatic cylinder (612), a hydraulic piston (616) is arranged in the hydraulic cylinder (613), and the pneumatic piston (615) and the hydraulic piston (616) are connected with the transmission piece (614) through connecting rods respectively.

2. A heat pump type rectification system for the production of pseudocumene as claimed in claim 1, wherein: when the pneumatic piston (615) is positioned closest to the main tank body (32), the connecting rod pulls the transmission piece (614) to rotate so as to drive the hydraulic piston (616) to move to a position farthest from the liquid flow chamber (62).

3. A heat pump type rectification system for the production of pseudocumene as claimed in claim 1, wherein: the port of the liquid inlet pipe (7) which is communicated with the liquid flow chamber (62) is provided with a first one-way valve (63), and the first one-way valve (63) controls fluid to flow in one direction only from the liquid inlet pipe (7) to the liquid flow chamber (62).

4. A heat pump type rectification system for the production of pseudocumene as claimed in claim 1, wherein: the port of the liquid outlet pipe (8) communicated with the liquid flow chamber (62) is provided with a second one-way valve (64), and the second one-way valve (64) controls the fluid to flow from the liquid flow chamber (62) to the liquid injection cavity (303).

5. A heat pump type rectification system for the production of pseudocumene as claimed in claim 1, wherein: the vapor compressor (4) comprises a compression tank (41), a gas compressing piece (42), a gas inlet one-way valve (43) and at least one gas outlet one-way valve (44), wherein the compression tank (41) is provided with a compression cavity (401) and a gas exhaust cavity (402), and the gas exhaust cavity (402) is arranged on the outer layer of the compression cavity (401).

6. A heat pump type rectification system for use in the production of pseudocumene as claimed in claim 5, wherein: the compression cavity (401) is communicated with the exhaust cavity (402) through an outlet one-way valve (44), and the inlet one-way valve (43) is communicated with the gas phase cavity (301) and the compression cavity (401).

7. The heat pump type rectification system for producing pseudocumene as defined in claim 6, wherein: the gas inlet one-way valve (43) controls the gas in the gas phase cavity 301 to flow unidirectionally to the compression cavity (401) when reaching a preset pressure, and the gas outlet one-way valve (44) controls the gas in the compression cavity (401) to be unidirectionally discharged to the discharge cavity (402) when reaching the preset pressure.

8. The heat pump type rectification system for producing pseudocumene as defined in claim 6, wherein: the air compressing piece (42) is arranged in the compression cavity (401), and the air compressing piece (42) is arranged at one side far away from the air inlet one-way valve (43) and the air outlet one-way valve (44).