Asphalt-trichloroethylene efficient separation system and separation method

Abstract

The invention provides an asphalt-trichloroethylene efficient separation system and a separation method. The separation system comprises an oil bath pan, a bracket, a lifting rotating mechanism, a distillation flask, a condenser, a refrigeration device, a mixed liquid storage tank, a collection bottle, a collection tank and a controller, the rotation rate of the distillation flask and the immersion depth of the distillation flask in an oil bath pan can be flexibly adjusted, the oil bath temperature is uniform, and asphalt aging is avoided; the refrigerating device can continuously and circularly cool the condenser, so that trichloroethylene is prevented from being volatilized; meanwhile, continuous and automatic feeding can be realized; the collecting box is arranged to be matched with the collecting bottle to collect the trichloroethylene solution separated by the condenser, and the storage capacity of trichloroethylene is effectively improved. The problems that in the asphalt recycling process of a rotary evaporator in the prior art, automatic and continuous feeding cannot be achieved, the trichloroethylene storage capacity is limited, the temperature of condensate water cannot be controlled, consequently, trichloroethylene volatilizes, and an eggplant-shaped bottle explodes to boil due to excessive feeding at a time are solved.

Description

Technical Field

[0001] The invention relates to the field of asphalt separation, and in particular to an asphalt-trichloroethylene high-efficiency separation system and a separation method. Background Art

[0002] At present, in the daily maintenance of pavement, it is necessary to recover asphalt from asphalt pavement or asphalt mixture, and measure various properties and chemical components of the recovered asphalt, so as to evaluate the aging degree of asphalt in asphalt pavement or asphalt mixture, analyze the cause of damage to asphalt pavement, and design the mix ratio of recycled asphalt mixture. Asphalt separation and recovery generally uses a rotary evaporator to recover asphalt from asphalt mixture.

[0003] The existing rotary evaporator cannot automatically and continuously add materials during the asphalt recovery process. The capacity of storing trichloroethylene is limited. The condensed water temperature cannot be controlled, resulting in the volatilization of trichloroethylene. Too much material is added to the eggplant-shaped bottle at one time, which is prone to boiling. The amount of asphalt obtained each time is small and difficult to sample. In addition, the distillation ends at the "solvent-free gas condensation recovery" mentioned in the separation specification, which is difficult to judge with the naked eye. The uneven oil bath temperature causes asphalt aging. Using tap water for cooling is a waste of water resources on the one hand, and the high water temperature on the other hand causes trichloroethylene to escape. Summary of the invention

[0004] The main purpose of the present invention is to provide an asphalt-trichloroethylene efficient separation system and separation method, so as to at least solve the problems that the rotary evaporator in the prior art cannot automatically and continuously add materials during the asphalt recovery process, the capacity for storing trichloroethylene is limited, the condensed water temperature cannot be controlled resulting in the volatilization of trichloroethylene, and the eggplant-shaped bottle is prone to boiling due to excessive addition of materials at one time.

[0005] In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided an asphalt-trichloroethylene efficient separation system, comprising: an oil bath pot; a bracket, arranged on the side of the oil bath pot; a lifting and rotating mechanism, mounted on the bracket so as to be able to rise or fall in the vertical direction; a distillation flask, rotatably mounted on the front end of the lifting and rotating mechanism around its axis and rising or falling synchronously with the lifting and rotating mechanism; a condenser, fixedly arranged at the rear end of the lifting and rotating mechanism and connected to the distillation flask; a vacuum pump connection port and a carbon dioxide inlet port are provided on the condenser; a refrigeration device, connected to the condenser, the refrigeration device is used for circulating cooling of the condenser; a mixed liquid storage tank, the mixed liquid storage tank is used to store the asphalt-trichloroethylene to be separated Ethylene mixed liquid, the mixed liquid storage tank is connected with the condenser through a first connecting pipe to convey the asphalt-trichloroethylene mixed liquid to be separated to the distillation flask, and a first automatic control valve is arranged on the first connecting pipe; a collecting bottle, which is arranged at the lower end of the condenser and is interconnected with the condenser, and the collecting bottle is used to collect the separated trichloroethylene solution; a collecting box, which is connected with the bottom end of the collecting bottle through a second connecting pipe, and the collecting box is used to store the trichloroethylene solution collected by the collecting bottle; a second automatic control valve is arranged on the second connecting pipe; a controller, which is connected with the oil bath pot, the lifting and rotating mechanism, the refrigeration device, the first automatic control valve and the second automatic control valve to control the operation of the oil bath pot, the lifting and rotating mechanism, the refrigeration device, the first automatic control valve and the second automatic control valve.

[0006] Furthermore, the separation system also includes: a quality sensor, which is arranged in the distillation flask to monitor the quality of the asphalt-trichloroethylene mixture to be separated in the distillation flask; wherein the controller is also connected to the quality sensor to receive the monitoring signal of the quality sensor.

[0007] Furthermore, the separation system also includes: a telescopic stirring rod, which is telescopically arranged in the distillation flask along the axial direction of the distillation flask, and a temperature probe is arranged at the head end of the telescopic stirring rod; the rear end of the telescopic stirring rod passes through the condenser and extends to the outside of the condenser; wherein the controller is also connected to the temperature probe to receive the monitoring signal of the temperature probe.

[0008] Furthermore, the telescopic stirring rod comprises a telescopic rod and a plurality of stirring rods located at the front end of the telescopic rod, and the temperature probe is arranged on the stirring rod.

[0009] Furthermore, the separation system also includes: a condensate sensor, which is arranged between the condenser and the collecting bottle, and the condensate sensor is used to monitor whether there is liquid flowing down the condenser and the collecting bottle; wherein the controller is also connected to the condensate sensor to receive the monitoring signal of the condensate sensor.

[0010] Furthermore, the separation system also includes: a first liquid level sensor, which is arranged in the collecting bottle to monitor the liquid level of the trichloroethylene solution collected in the collecting bottle; a second liquid level sensor, which is arranged in the collecting box to monitor the liquid level of the trichloroethylene solution collected in the collecting box; a third liquid level sensor, which is arranged in the mixed liquid storage tank to monitor the liquid level of the asphalt-trichloroethylene mixed liquid to be separated in the mixed liquid storage tank; wherein the controller is also connected to the first liquid level sensor, the second liquid level sensor and the third liquid level sensor to receive monitoring signals from the first liquid level sensor, the second liquid level sensor and the third liquid level sensor.

[0011] According to a second aspect of the present invention, there is provided an efficient asphalt-trichloroethylene separation method, which is applied to the separation system of the above content, and the separation method comprises: adding the asphalt-trichloroethylene mixed liquid to be separated into the mixed liquid storage tank; evacuating the entire system through the vacuum pump connection port on the condenser; driving the distillation flask to rotate at a first preset speed for 5 to 10 minutes through the lifting and rotating mechanism before the distillation flask is immersed in the oil bath pot; heating the oil bath temperature of the oil bath pot to 50°C±5°C, keeping the distillation flask rotating at the first preset speed, and slowly immersing it in the oil bath pot to evaporate and separate the asphalt-trichloroethylene mixed liquid in the distillation flask; when a stable trichloroethylene solution flows down the condenser, gradually increasing the rotation speed of the distillation flask, and slowly increasing the oil bath temperature of the oil bath pot to 110°C±5°C, and at the same time gradually lowering the temperature through the lifting and rotating mechanism; Lower the height of the distillation flask to increase the volume of the distillation flask immersed in the oil bath; when the asphalt-trichloroethylene mixed liquid in the mixed liquid storage tank is recovered and there is condensate visible to the naked eye at the mouth of the collecting bottle, the concentration procedure is completed; adjust the rotation speed of the distillation flask to a second preset speed through the lifting and rotating mechanism and keep the rotation state, and increase the oil bath temperature of the oil bath to 155℃±2℃ within 15 minutes; when no condensed trichloroethylene solution falls from the condenser for 5 consecutive minutes, introduce carbon dioxide gas into the entire system at a flow rate of 1000mL / min for 2 minutes through the carbon dioxide inlet on the condenser; close the carbon dioxide inlet to gradually restore the pressure in the distillation flask to normal pressure, control the distillation flask to stop rotating and rise up to leave the oil bath through the lifting and rotating mechanism; remove the distillation flask and quickly pour out the asphalt remaining in the distillation flask to complete the asphalt collection.

[0012] The asphalt-trichloroethylene efficient separation system of the technical solution of the present invention comprises an oil bath pot, a bracket, a lifting and rotating mechanism, a distillation flask, a condenser, a refrigeration device, a mixed liquid storage box, a collection bottle, a collection box and a controller; the bracket is arranged on the side of the oil bath pot; the lifting and rotating mechanism is installed on the bracket so as to be able to rise or fall in the vertical direction; the distillation flask is rotatably installed around its axis at the front end of the lifting and rotating mechanism and rises or falls synchronously with the lifting and rotating mechanism; the condenser is fixedly arranged at the rear end of the lifting and rotating mechanism and is connected to the distillation flask; a vacuum pump connection port and a carbon dioxide inlet port are provided on the condenser; the refrigeration device is connected to the condenser, and the refrigeration device is used for circulating cooling of the condenser; the mixed liquid storage box is used for storing The asphalt-trichloroethylene mixed liquid is separated, and the mixed liquid storage tank is connected with the condenser through a first connecting pipe to convey the asphalt-trichloroethylene mixed liquid to be separated to the distillation flask, and a first automatic control valve is arranged on the first connecting pipe; a collecting bottle is arranged at the lower end of the condenser and is interconnected with the condenser, and the collecting bottle is used to collect the separated trichloroethylene solution; the collecting box is connected with the bottom end of the collecting bottle through a second connecting pipe, and the collecting box is used to store the trichloroethylene solution collected by the collecting bottle; a second automatic control valve is arranged on the second connecting pipe; a controller is connected with the oil bath pot, the lifting and rotating mechanism, the refrigeration device, the first automatic control valve and the second automatic control valve to control the operation of the oil bath pot, the lifting and rotating mechanism, the refrigeration device, the first automatic control valve and the second automatic control valve. The lifting and rotating mechanism can flexibly adjust the rotation rate of the distillation flask and the depth of immersion in the oil bath pot, so as to ensure that the oil bath temperature is uniform and avoid asphalt aging; the condenser can be continuously circulated and cooled by the refrigeration device, so as to ensure stable control of the condensation temperature and avoid trichloroethylene volatilization; the mixed liquid storage box, the first connecting pipe and the first automatic control valve can automatically transport the asphalt-trichloroethylene mixed liquid to be separated into the distillation flask according to the weight change of the asphalt-trichloroethylene mixed liquid in the distillation flask, so as to achieve continuous and automatic feeding; the trichloroethylene solution separated by the condenser is collected by setting a collection box and a collection bottle, so as to effectively increase the storage capacity of trichloroethylene and ensure that the storage of trichloroethylene meets the requirements of the entire separation process. The invention solves the problems that the rotary evaporator in the prior art cannot automatically and continuously feed during the asphalt recovery process, the capacity for storing trichloroethylene is limited, the condensed water temperature cannot be controlled, resulting in the volatilization of trichloroethylene, and the eggplant-shaped bottle is prone to boiling due to excessive feeding at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 This is a schematic structural diagram of an optional asphalt-trichloroethylene efficient separation system according to an embodiment of the present invention;

[0015] Figure 2 The present invention is a schematic flow chart of an optional asphalt-trichloroethylene efficient separation method according to an embodiment of the present invention.

[0016] The above drawings include the following reference numerals:

[0017] 10. Oil bath pot; 20. Bracket; 30. Lifting and rotating mechanism; 40. Distillation flask; 50. Condenser; 51. Vacuum pump connection port; 52. Carbon dioxide inlet port; 60. Refrigeration device; 70. Mixed liquid storage tank; 80. First automatic control valve; 90. Collecting bottle; 100. Collecting tank; 110. Second automatic control valve; 120. Controller; 130. Quality sensor; 140. Telescopic stirring rod; 141. Temperature probe; 142. Telescopic rod; 143. Stirring rod; 150. Condensate sensor; 160. First liquid level sensor; 170. Second liquid level sensor; 180. Third liquid level sensor. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] The asphalt-trichloroethylene efficient separation system of the embodiment of the present invention is as follows: Figure 1As shown, it includes an oil bath pot 10, a bracket 20, a lifting and rotating mechanism 30, a distillation flask 40, a condenser 50, a refrigeration device 60, a mixed liquid storage box 70, a collecting bottle 90, a collecting box 100 and a controller 120; the bracket 20 is arranged on the side of the oil bath pot 10; the lifting and rotating mechanism 30 is installed on the bracket 20 so as to be able to rise or fall in the vertical direction; the distillation flask 40 is rotatably installed around its axis at the front end of the lifting and rotating mechanism 30 and rises or falls synchronously with the lifting and rotating mechanism 30; the condenser 50 is fixedly arranged at the rear end of the lifting and rotating mechanism 30 and is connected to the distillation flask 40; a vacuum pump connection port 51 and a carbon dioxide inlet port 52 are provided on the condenser 50; the refrigeration device 60 is connected to the condenser 50, and the refrigeration device 60 is used to circulate and cool the condenser 50; the mixed liquid storage box 70 is used to store the asphalt to be separated-three Vinyl chloride mixed liquid, the mixed liquid storage tank 70 is connected with the condenser 50 through a first connecting pipe to convey the asphalt-trichloroethylene mixed liquid to be separated to the distillation flask 40, and a first automatic control valve 80 is arranged on the first connecting pipe; a collecting bottle 90 is arranged at the lower end of the condenser 50 and is interconnected with the condenser 50, and the collecting bottle 90 is used to collect the separated trichloroethylene solution; a collecting box 100 is connected with the bottom end of the collecting bottle 90 through a second connecting pipe, and the collecting box 100 is used to store the trichloroethylene solution collected by the collecting bottle 90; a second automatic control valve 110 is arranged on the second connecting pipe; a controller 120 is connected with the oil bath pot 10, the lifting and rotating mechanism 30, the refrigeration device 60, the first automatic control valve 80 and the second automatic control valve 110 to control the operation of the oil bath pot 10, the lifting and rotating mechanism 30, the refrigeration device 60, the first automatic control valve 80 and the second automatic control valve 110. The lifting and rotating mechanism 30 can flexibly adjust the rotation rate of the distillation flask 40 and the depth of immersion in the oil bath pot 10, so as to ensure that the oil bath temperature is uniform and avoid asphalt aging; the condenser 50 can be continuously circulated and cooled by the refrigeration device 60, so as to ensure stable control of the condensation temperature and avoid the volatilization of trichloroethylene; the mixed liquid storage box 70, the first connecting pipe and the first automatic control valve 80 can automatically transport the asphalt-trichloroethylene mixed liquid to be separated into the distillation flask 40 according to the weight change of the asphalt-trichloroethylene mixed liquid in the distillation flask 40, so as to achieve continuous and automatic feeding; the collection box 100 is set to cooperate with the collection bottle 90 to collect the trichloroethylene solution separated by the condenser 50, so as to effectively increase the storage capacity of trichloroethylene and ensure that the storage of trichloroethylene meets the requirements of the entire separation process. The invention solves the problems that the rotary evaporator in the prior art cannot be automatically and continuously fed during the asphalt recovery process, the capacity for storing trichloroethylene is limited, the condensed water temperature cannot be controlled, resulting in the volatilization of trichloroethylene, and the eggplant-shaped bottle is prone to boiling due to excessive feeding at one time.

[0020] In specific implementation, the volume of the collection box 100 is greater than the volume of the mixed liquid storage box 70. The separation system also includes a quality sensor 130, which is arranged at the bottle mouth position in the distillation flask 40. The controller 120 is also connected to the quality sensor 130 to receive the monitoring signal of the quality sensor 130. As the separation process proceeds, the asphalt-trichloroethylene mixed liquid in the distillation flask 40 gradually decreases. The quality sensor 130 can monitor the quality of the asphalt-trichloroethylene mixed liquid to be separated in the distillation flask 40 in real time. When the quality of the asphalt-trichloroethylene mixed liquid in the distillation flask 40 is less than the set threshold, the quality sensor 130 sends a signal to the controller 120. After receiving the signal, the controller 120 controls the first automatic control valve 80 to open, and the asphalt-trichloroethylene mixed liquid to be separated in the mixed liquid storage box 70 is replenished into the distillation flask 40 through the first connecting pipe and the condenser 50, thereby ensuring that the separation process continues.

[0021] Further, the separation system further comprises a telescopic stirring rod 140, which is telescopically arranged in the distillation flask 40 along the axial direction of the distillation flask 40, and a temperature probe 141 is arranged at the head end of the telescopic stirring rod 140; the rear end of the telescopic stirring rod 140 passes through the condenser 50 and extends to the outside of the condenser 50; the controller 120 is also connected to the temperature probe 141 to receive the monitoring signal of the temperature probe 141, so as to control the oil bath temperature of the oil bath pot 10 according to the monitored temperature in the distillation flask 40, so as to make the temperature in the distillation flask 40 within the required temperature range. Optionally, the telescopic stirring rod 140 comprises a telescopic rod 142 and a plurality of stirring rods 143 located at the front end of the telescopic rod 142, and the temperature probe 141 is arranged on the stirring rod 143, and optionally, each stirring rod 143 is a flexible and deformable rod body, and each stirring rod 143 is arranged at a certain angle to each other. The telescopic rod 142 can be telescopically moved along the axis direction of the condenser 50 and the distillation flask 40. The rear end of the telescopic rod 142 is located outside the condenser 50. When the operator pulls the telescopic rod 142 backward, the stirring rods 143 are gathered together; when the telescopic rod 142 is pushed forward, the stirring rods 143 automatically extend. By rotating the telescopic rod 142 to drive the stirring rods 143, the asphalt-trichloroethylene mixture in the distillation flask 40 can be stirred, thereby increasing the volatilization rate of trichloroethylene in the mixture.

[0022] Furthermore, the separation system further includes a condensate sensor 150, which is disposed between the lower port of the condenser 50 and the upper port of the collecting bottle 90, and is used to monitor whether liquid flows down the condenser 50 and the collecting bottle 90; the controller 120 is also connected to the condensate sensor 150 to receive a monitoring signal from the condensate sensor 150. The condensate sensor 150 can accurately determine whether the trichloroethylene solution has been recovered, thereby reducing errors caused by human judgment.

[0023] Furthermore, the separation system also includes a first liquid level sensor 160, a second liquid level sensor 170 and a third liquid level sensor 180. The first liquid level sensor 160 is arranged in the collecting bottle 90 to monitor the liquid level of the trichloroethylene solution collected in the collecting bottle 90; the second liquid level sensor 170 is arranged in the collecting box 100 to monitor the liquid level of the trichloroethylene solution collected in the collecting box 100; the third liquid level sensor 180 is arranged in the mixed liquid storage tank 70 to monitor the liquid level of the asphalt-trichloroethylene mixed liquid to be separated in the mixed liquid storage tank 70; wherein the controller 120 is also connected to the first liquid level sensor 160, the second liquid level sensor 170 and the third liquid level sensor 180 to receive monitoring signals of the first liquid level sensor 160, the second liquid level sensor 170 and the third liquid level sensor 180. When the liquid level of the trichloroethylene solution in the collection bottle 90 reaches the set liquid level, the controller 120 controls the second automatic control valve 110 on the second connecting pipe to open, and the trichloroethylene solution collected in the collection bottle 90 flows into the larger collection box 100 for storage, thereby increasing the collection capacity of the trichloroethylene solution and avoiding the overflow of the trichloroethylene solution in the collection bottle 90 to affect the separation process. The second liquid level sensor 170 can monitor the liquid level of the trichloroethylene solution collected in the collection box 100 in real time. When the collection box 100 reaches the set capacity, the collection box 100 needs to be replaced; the third liquid level sensor 180 can monitor the liquid level of the asphalt-trichloroethylene mixed liquid to be separated in the mixed liquid storage box 70 in real time. When the liquid level in the mixed liquid storage box 70 is lower than the preset value, the asphalt-trichloroethylene mixed liquid needs to be added to the mixed liquid storage box 70 to ensure the continuous separation process.

[0024] According to a second embodiment of the present invention, Figure 2 As shown, a method for efficiently separating asphalt from trichloroethylene is provided. The method is applied to the separation system of the above embodiment, and the method comprises the following steps:

[0025] S102: Adding the asphalt-trichloroethylene mixed liquid to be separated into the mixed liquid storage tank 70;

[0026] S104: evacuate the entire system through the vacuum pump connection port 51 on the condenser 50;

[0027] S106: before the distillation flask 40 is immersed in the oil bath 10, the distillation flask 40 is driven to rotate at a first preset speed for 5 to 10 minutes by the lifting and rotating mechanism 30;

[0028] S108: heating the oil bath temperature of the oil bath pot 10 to 50° C.±5° C., and slowly immersing the distillation flask 40 in the oil bath pot 10 while keeping the distillation flask 40 rotating at a first preset speed so as to evaporate and separate the asphalt-trichloroethylene mixed liquid in the distillation flask 40;

[0029] S110: When a stable trichloroethylene solution flows down the condenser 50, the rotation speed of the distillation flask 40 is gradually increased, and the oil bath temperature of the oil bath pot 10 is slowly increased to 110° C.±5° C., and at the same time, the height of the distillation flask 40 is gradually lowered by the lifting and rotating mechanism 30 to increase the volume of the distillation flask 40 immersed in the oil bath pot 10;

[0030] S112: When the asphalt-trichloroethylene mixed liquid in the mixed liquid storage tank 70 is completely recovered and there is condensate visible to the naked eye at the mouth of the collecting bottle 90, the concentration process is completed;

[0031] S114: adjusting the rotation speed of the distillation flask 40 to a second preset rotation speed through the lifting and rotating mechanism 30 and continuously maintaining the rotation state, and raising the oil bath temperature of the oil bath pot 10 to 155° C.±2° C. within 15 minutes;

[0032] S116: When no condensed trichloroethylene solution falls from the condenser 50 for 5 consecutive minutes, carbon dioxide gas is introduced into the entire system through the carbon dioxide inlet 52 on the condenser 50 at a flow rate of 1000 mL / min for 2 minutes;

[0033] S118: Close the carbon dioxide inlet 52 to gradually restore the pressure in the distillation flask 40 to normal pressure, and control the distillation flask 40 to stop rotating and rise up to leave the oil bath pot 10 through the lifting and rotating mechanism 30; remove the distillation flask 40 and quickly pour out the remaining asphalt in the distillation flask 40 to complete the asphalt collection.

[0034] The asphalt-trichloroethylene efficient separation method of the embodiment of the present invention changes the asphalt extraction process to first concentration (continuous addition of asphalt-trichloroethylene mixed solution) and then extraction, that is, the asphalt-trichloroethylene solution is gradually concentrated by continuous addition, and after the concentration is completed, thorough distillation is started. During the process, trichloroethylene continuously absorbs heat, which can prevent asphalt oxidation and aging.

[0035] When the asphalt-trichloroethylene efficient separation system of the embodiment of the present invention is used, the instrument is assembled according to the specifications, the distillation flask 40 is installed on the lifting and rotating mechanism 30, the vacuum pump connection port 51 is connected to the vacuum pump or the vacuum pump, and the carbon dioxide air inlet 52 is connected to the carbon dioxide gas supply equipment; the asphalt-trichloroethylene mixed liquid is added to the mixed liquid storage tank 70, and the vacuum pump or the vacuum pump is started to form a negative pressure inside the entire system, with a vacuum degree of 94.7 kPa (710 mmHg), that is, the absolute negative pressure is below 6.67 kPa (50 mmHg); then the lifting and rotating mechanism 30 is started to drive the distillation flask 40 to rotate, and it rotates at a speed of 50 r / min for 5-10 minutes without being immersed in an oil bath. The oil bath temperature of the oil bath pot 10 is preheated to 50°C±5°C; while maintaining the above-mentioned speed of rotation, the lifting and rotating mechanism 30 is slowly lowered to drive the bottom of the distillation flask 40 to gradually immerse in the oil bath that has reached 50°C±5°C, and the asphalt-trichloroethylene solution in the distillation flask 40 begins to evaporate. The condenser 50 is continuously cooled by the refrigeration device 60, and the volatilized trichloroethylene reaches the condenser 50 and forms a trichloroethylene solution after being cooled and flows into the collecting bottle 90 through the lower port of the condenser 50. When the condensate sensor 150 detects that the trichloroethylene solution flowing into the collecting bottle 90 reaches a stable state, the rotation speed of the distillation flask 40 is gradually increased, and the oil bath temperature of the oil bath pot 10 is slowly increased until the temperature in the distillation flask 40 reaches 110°C±5°C. At the same time, the lifting and rotating mechanism 30 is continuously controlled to descend to increase the heating area of ​​the distillation flask 40 immersed in the oil bath and accelerate the evaporation rate of the trichloroethylene.

[0036] During the whole process, the monitoring signal processing of each sensor, the movement of the lifting and rotating mechanism 30, the heating of the oil bath pot 10, and the opening or closing of each control valve are all controlled by the controller 120 to realize automatic liquid replenishment, automatic concentration, and automatic separation and extraction. When the asphalt-trichloroethylene mixed liquid in the mixed liquid storage tank 70 is completely recovered and there is condensate visible to the naked eye at the mouth of the collecting bottle 90, the concentration process is completed.

[0037] Then the rotation speed of the distillation flask 40 is reduced to 20r / min, and the distillation flask 40 continues to rotate. The oil bath temperature of the oil bath pot 10 is raised to 155℃+2℃ within 15min. No condensed liquid is seen falling from the condensate sensor 150 for 5 consecutive minutes. Then the carbon dioxide inlet 52 is opened, and carbon dioxide gas is introduced at a flow rate of 1000mL / min for 2min. Then the carbon dioxide inlet 52 is closed, and the pressure in the distillation flask 40 is gradually restored to normal pressure. The rotation of the distillation flask 40 is stopped, and the oil bath pot 10 is left. The distillation flask 40 is removed and the residual asphalt inside is quickly poured out, and various tests for recovering asphalt are carried out.

[0038] The volume of the collecting box 100 is larger than that of the mixed liquid storage box 70. It is necessary to estimate the asphalt content in the mixed liquid storage box 70, and the volume of the distillation bottle 40 should be three times the volume of the asphalt. For example, if there are 500 mL of asphalt in the solution of the mixed liquid storage box 70, the volume of the distillation bottle 40 should be greater than 1.5 L. The density of asphalt and asphalt-trichloroethylene mixed liquid is regarded as 1 (mass equivalent volume), the lower limit of the mass in the distillation bottle 40 is 500 g, and the upper limit is half of the volume of the distillation bottle 40, that is, 750 g.

[0039] Example: About 300 g of 70# base asphalt and SBS modified asphalt were respectively dissolved in 3 L of trichloroethylene, and the asphalt was recovered according to the separation method of the embodiment of the present invention, and the softening point and needle penetration of the recovered asphalt were tested and compared with the original asphalt, and the results are listed in the following table;

[0040] (1) Base asphalt

[0041]

[0042] (2) SBS modified asphalt

[0043]

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An asphalt-trichloroethylene efficient separation system, characterized in that: include: Oil bath pot (10); A bracket (20) is arranged on the side of the oil bath pot (10); A lifting and rotating mechanism (30) is mounted on the bracket (20) so as to be able to rise or fall in a vertical direction; A distillation flask (40) is rotatably mounted around its axis at the front end of the lifting and rotating mechanism (30) and rises or falls synchronously with the lifting and rotating mechanism (30); a condenser (50) fixedly arranged at the rear end of the lifting and rotating mechanism (30) and connected to the distillation flask (40); a vacuum pump connection port (51) and a carbon dioxide inlet port (52) are provided on the condenser (50); A refrigeration device (60) is connected to the condenser (50), and the refrigeration device (60) is used for circulating cooling of the condenser (50); a mixed liquid storage tank (70), the mixed liquid storage tank (70) being used to store the asphalt-trichloroethylene mixed liquid to be separated, the mixed liquid storage tank (70) being connected to the condenser (50) via a first connecting pipe so as to transport the asphalt-trichloroethylene mixed liquid to be separated to the distillation flask (40), the first connecting pipe being provided with a first automatic control valve (80); a collecting bottle (90), arranged at the lower end of the condenser (50) and connected to the condenser (50), the collecting bottle (90) being used to collect the separated trichloroethylene solution; a collecting box (100), the collecting box (100) being connected to the bottom end of the collecting bottle (90) via a second connecting pipe, the collecting box (100) being used to store the trichloroethylene solution collected by the collecting bottle (90); a second automatic control valve (110) being provided on the second connecting pipe; A controller (120) is connected to the oil bath pot (10), the lifting and rotating mechanism (30), the refrigeration device (60), the first automatic control valve (80) and the second automatic control valve (110) to control the operation of the oil bath pot (10), the lifting and rotating mechanism (30), the refrigeration device (60), the first automatic control valve (80) and the second automatic control valve (110).

2. The asphalt-trichloroethylene efficient separation system according to claim 1, characterized in that: The separation system further comprises: A quality sensor (130) is disposed in the distillation flask (40) to monitor the quality of the asphalt-trichloroethylene mixed liquid to be separated in the distillation flask (40); The controller (120) is also connected to the quality sensor (130) to receive a monitoring signal from the quality sensor (130).

3. The asphalt-trichloroethylene efficient separation system according to claim 1, characterized in that: The separation system further comprises: a telescopic stirring rod (140) which is telescopically arranged in the distillation flask (40) along the axial direction of the distillation flask (40); a temperature probe (141) is arranged at the head end of the telescopic stirring rod (140); a rear end of the telescopic stirring rod (140) passes through the condenser (50) and extends to the outside of the condenser (50); The controller (120) is also connected to the temperature probe (141) to receive a monitoring signal from the temperature probe (141).

4. The asphalt-trichloroethylene efficient separation system according to claim 3, characterized in that: The telescopic stirring rod (140) comprises a telescopic rod (142) and a plurality of stirring rods (143) located at the front end of the telescopic rod (142), and the temperature probe (141) is arranged on the stirring rod (143).

5. The asphalt-trichloroethylene efficient separation system according to claim 1, characterized in that: The separation system further comprises: a condensate sensor (150), arranged between the condenser (50) and the collecting bottle (90), the condensate sensor (150) being used to monitor whether liquid flows down from the condenser (50) and the collecting bottle (90); The controller (120) is also connected to the condensate sensor (150) to receive a monitoring signal from the condensate sensor (150).

6. The asphalt-trichloroethylene efficient separation system according to claim 1, characterized in that: The separation system further comprises: a first liquid level sensor (160) disposed in the collecting bottle (90) to monitor the liquid level of the trichloroethylene solution collected in the collecting bottle (90); a second liquid level sensor (170) disposed in the collection box (100) to monitor the liquid level of the trichloroethylene solution collected in the collection box (100); a third liquid level sensor (180) disposed in the mixed liquid storage tank (70) to monitor the liquid level of the asphalt-trichloroethylene mixed liquid to be separated in the mixed liquid storage tank (70); The controller (120) is also connected to the first liquid level sensor (160), the second liquid level sensor (170) and the third liquid level sensor (180) to receive monitoring signals from the first liquid level sensor (160), the second liquid level sensor (170) and the third liquid level sensor (180).

7. An efficient asphalt-trichloroethylene separation method, characterized in that: The separation method is applied to the separation system according to any one of claims 1 to 6, and the separation method comprises: Adding the asphalt-trichloroethylene mixed liquid to be separated into the mixed liquid storage tank (70); evacuating the entire system through the vacuum pump connection port (51) on the condenser (50); Before the distillation flask (40) is immersed in the oil bath pot (10), the distillation flask (40) is driven to rotate at a first preset speed for 5 to 10 minutes by the lifting and rotating mechanism (30); The oil bath temperature of the oil bath pot (10) is heated to 50°C ± 5°C, and the distillation flask (40) is kept rotating at the first preset speed, and is slowly immersed in the oil bath pot (10) to evaporate and separate the asphalt-trichloroethylene mixed liquid in the distillation flask (40); When a stable trichloroethylene solution flows down the condenser (50), the rotation speed of the distillation flask (40) is gradually increased, and the oil bath temperature of the oil bath pot (10) is slowly increased to 110°C±5°C, and at the same time, the height of the distillation flask (40) is gradually lowered by the lifting and rotating mechanism (30) to increase the volume of the distillation flask (40) immersed in the oil bath pot (10); When the asphalt-trichloroethylene mixed liquid in the mixed liquid storage tank (70) is completely recovered and condensate visible to the naked eye appears at the mouth of the collecting bottle (90), the concentration process is completed; The rotation speed of the distillation flask (40) is adjusted to a second preset rotation speed by the lifting and rotating mechanism (30) and the rotation state is continuously maintained, and the oil bath temperature of the oil bath pot (10) is increased to 155° C.±2° C. within 15 minutes; When no condensed trichloroethylene solution falls from the condenser (50) for 5 consecutive minutes, carbon dioxide gas is introduced into the entire system through the carbon dioxide inlet (52) on the condenser (50) at a flow rate of 1000 mL / min for 2 minutes; The carbon dioxide inlet (52) is closed to gradually restore the pressure in the distillation flask (40) to normal pressure, and the distillation flask (40) is controlled by the lifting and rotating mechanism (30) to stop rotating and rise up to leave the oil bath pot (10); The distillation flask (40) is removed and the residual asphalt in the distillation flask (40) is quickly poured out to complete the asphalt collection.

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