A TMA residual liquid recovery tank

Abstract

The present invention discloses a TMA residual liquid recovery tank, relating to the technical field of recovery tanks. The tank comprises a controller and a trimethylamine separation device consisting of an alkalization gas stripping tower, an acidification absorption tower, a regeneration reactor, and a liquefaction compressor, wherein a recovery tank body is provided on one side of the liquefaction compressor. The tank body is provided with a trimethylamine detection spectrometer, a fifth solenoid valve, a sixth solenoid valve, and a residual liquid reflux pipe. When the residual liquid is discharged, the concentration of the discharged residual liquid is detected by the trimethylamine detection spectrometer. When the detected concentration value is less than a set value, or when the detected concentration value is greater than the set value, the controller controls the fifth solenoid valve to close and the sixth solenoid valve to open. Under the power of a second liquid pump, the residual liquid is discharged into the recovery tank body through the residual liquid reflux pipe. The residual liquid is stored in the recovery tank body for later reuse, thereby reducing resource waste.

Description

Technical Field

[0001] The invention relates to the technical field of recovery tanks, in particular to a TMA residual liquid recovery tank. Background Art

[0002] Trimethylamine (TMA) is the simplest tertiary amine. It is a colorless gas at room temperature with a fishy odor. It is soluble in water, ethanol, and ether. It is flammable and toxic. Its molecular formula is C3H9N. It can be used as an analytical reagent and for amination in organic synthesis. Trimethylamine wastewater may be generated during industrial production.

[0003] Chinese invention patent application publication number CN104725238A discloses a trimethylamine recovery device, comprising a reaction evaporator, a distillation column, a condenser, a gas-liquid separator, an absorption liquid intermediate tank, an absorption liquid intermediate pump, and a clean water intermediate tank. Circulating absorption in the absorption liquid intermediate tank improves trimethylamine recovery concentration, resulting in a high trimethylamine recovery rate. The separation of the distillation column and the reaction evaporator allows for high wastewater treatment capacity, a high number of theoretical plates, low resistance losses, stable and reliable performance, continuous or intermittent operation, automatic control, online cleaning, anti-clogging capabilities, online reaction without device shutdown, reduced aeration energy consumption, and a small footprint and simple layout.

[0004] For example, Chinese invention patent application publication number CN102942488A discloses a regeneration process and apparatus for recovering methylamine solution. The apparatus comprises a separation tower, an absorption tower, a gas-liquid separator, and a series of supporting heat exchange equipment. This process produces high-purity methylamine gas by pressurizing and rectifying the recovered, doped methylamine solution in the separation tower. In the absorption tower, the gaseous methylamine is absorbed by an absorbent, removing impurities such as dimethylamine and trimethylamine, whose boiling points lie between those of methylamine and the solvent, thereby ensuring the concentration and purity of the regenerated methylamine solution.

[0005] The existing technology still has certain defects in practical applications. For example, during the working process, the trimethylamine waste liquid to be treated will fluctuate in concentration due to changes in front-end production factors. After gas stripping and drainage according to the preset time, if the trimethylamine concentration in the discharged reaction residual liquid is high, it will waste resources. Summary of the Invention

[0006] The object of the present invention is to provide a TMA residual liquid recovery tank to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a TMA residual liquid recovery tank, comprising a controller and a trimethylamine separation device consisting of an alkalization gas stripping tower, an acidification absorption tower, a regeneration reactor, and a liquefaction compressor, wherein a recovery tank body is provided on one side of the liquefaction compressor, a second liquid pump is connected to the residual liquid discharge pipe at the bottom of the alkalization gas stripping tower, a trimethylamine detection spectrometer is connected to the residual liquid discharge pipe at the bottom of the second liquid pump, and a fifth solenoid valve is connected to the bottom of the residual liquid discharge pipe;

[0008] The residual liquid discharge pipe located between the fifth solenoid valve and the trimethylamine detection spectrometer is fixedly connected to a residual liquid reflux pipe, and the residual liquid reflux pipe is fixedly connected to the recovery tank;

[0009] The top of the recovery tank is provided with a pressure monitor and a liquid level monitor, which respectively detect the pressure and liquid level in the recovery tank. The top of the recovery tank is fixedly connected to a vent pipe, which is provided with a ninth solenoid valve, a flame arrester and a one-way valve in sequence from bottom to top.

[0010] A liquid discharge pipe is fixedly connected between the recovery tank and the alkalization gas stripping tower, and a third liquid pump and an eighth solenoid valve are connected to the liquid discharge pipe.

[0011] A trimethylamine waste liquid addition component and an inert gas addition component are also provided on the outside of the alkalization gas stripping tower. The trimethylamine waste liquid enters the bottom of the alkalization gas stripping tower through the trimethylamine waste liquid addition component, and the inert gas enters the alkalization gas stripping tower and the recovery tank through the inert gas addition component.

[0012] Furthermore, the trimethylamine waste liquid addition component includes a mixing tube, a third solenoid valve is connected to the tube body on one side of the mixing tube, a buffer is fixedly connected to the tube body on the other side of the mixing tube, a trimethylamine waste liquid inlet pipe is fixedly connected to one side of the buffer, and the tube body of the trimethylamine waste liquid inlet pipe is connected to the second solenoid valve and the first liquid pump.

[0013] Furthermore, the inert gas addition component includes an inert gas preparation device and a gas pipeline, the gas pipeline is fixedly connected to the inert gas preparation device, the pipe body of the gas pipeline is connected to a first solenoid valve and a booster pump, the gas outlet end of the gas pipeline is fixedly connected to the buffer, the pipe body of the mixing tube is fixedly connected to a trimethylamine waste liquid branch pipe, and the pipe body of the trimethylamine waste liquid branch pipe is connected to a fourth solenoid valve.

[0014] Furthermore, the buffer is a pipeline mixer, through which the inert gas is dispersed in the trimethylamine waste liquid in the form of bubbles.

[0015] Furthermore, a bend is provided on the tube body of the mixing tube, and the trimethylamine waste liquid branch pipe is fixedly connected to the bottom end of the bend.

[0016] Furthermore, the mixing pipe close to the alkalization gas stripping tower is tilted downward, and the third solenoid valve is connected to the downward tilted mixing pipe body.

[0017] Furthermore, a flow meter is connected to the pipe body of the liquid trimethylamine outlet pipe of the liquefied compressor, and a shunt pipe is fixedly connected to the pipe body of the liquid trimethylamine outlet pipe located outside the flow meter. The pipe body of the shunt pipe is connected to a seventh solenoid valve and an expansion valve, and the liquid trimethylamine is converted into gaseous trimethylamine through the expansion valve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The TMA residual liquid recovery tank is provided with a recovery tank body, a trimethylamine detection spectrometer, a fifth solenoid valve, a sixth solenoid valve and a residual liquid reflux pipe. When the residual liquid is discharged, the concentration of the discharged residual liquid is detected by the trimethylamine detection spectrometer. When the detected concentration value is less than the set value, when the detected concentration value is greater than the set value, the controller controls the fifth solenoid valve to close and the sixth solenoid valve to open. Under the power of the second liquid pump, the residual liquid is discharged into the recovery tank body through the residual liquid reflux pipe. The residual liquid is stored in the recovery tank body for later reuse, thereby reducing resource waste.

[0020] At the same time, a pipeline mixer is provided, and its unique internal baffle structure can make the inert gas evenly dispersed in the trimethylamine waste liquid in the form of bubbles, greatly increasing the gas-liquid contact area, improving the gas stripping efficiency, and allowing more trimethylamine to be blown out of the waste liquid.

[0021] Furthermore, when the amount of residual trimethylamine in the recovery tank reaches a set value, the controller controls the third solenoid valve and the second solenoid valve to close and controls the fourth solenoid valve to open. The trimethylamine waste liquid on the mixing tube body near the alkalization gas stripping tower side enters the elbow under the action of gravity. The continuous input of inert gas can empty the pipeline mixer and the mixing tube, reduce the corrosion of the pipeline mixer and the mixing tube walls caused by the trimethylamine waste liquid in the mixing tube, and further improve the practicality of the device.

[0022] In addition, a flow meter, a diverter pipe, a seventh solenoid valve and an expansion valve are also provided. When the flow meter detects that the flow rate of liquid trimethylamine is greater than the threshold value, the controller controls the opening and closing degree of the seventh solenoid valve. Part of the liquid trimethylamine is vaporized through the expansion valve and enters the bottom of the recovery tank body and dissolves with the residual trimethylamine liquid contained in the recovery tank body. The recovery tank body stores the residual trimethylamine liquid for reuse, thereby reducing the processing capacity of the waste liquid processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a left front axial view of the present invention;

[0024] Figure 2 A bottom view of the present invention;

[0025] Figure 3 It is a right front axial view of the present invention;

[0026] Figure 4 This is a connection diagram of the pipeline outside the recovery tank body of the present invention.

[0027] In the figure: 101, alkalization gas stripping tower; 102, acidification absorption tower; 103, regeneration reactor; 104, liquefaction compressor; 2, recovery tank; 3, inert gas preparation device; 4, gas pipeline; 401, first solenoid valve; 402, booster pump; 5, trimethylamine waste liquid inlet pipe; 501, second solenoid valve; 502, first liquid pump; 6, mixing pipe; 601, third solenoid valve; 7, elbow; 8, trimethylamine waste liquid branch pipe; 801, fourth solenoid valve; 9, residual liquid discharge pipe; 901, second liquid pump; 902, trimethylamine detection spectrometer; 903, fifth solenoid valve; 904, residual liquid reflux pipe; 905, sixth solenoid valve; 10, pipeline mixer; 11, liquid trimethylamine outlet pipe; 111, flow meter; 12, diverter pipe; 121, seventh solenoid valve; 122, expansion valve; 13, drain pipe; 131, third liquid pump; 132, eighth solenoid valve; 14, pressure monitor; 15, liquid level monitor; 16, vent pipe; 161, ninth solenoid valve; 162, flame arrester; 163, one-way valve. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 3As shown, the present invention provides a technical solution: a TMA residual liquid recovery tank, comprising a recovery tank body 2, a controller and a trimethylamine separation device consisting of an alkalization gas stripping tower 101, an acidification absorption tower 102, a regeneration reactor 103 and a liquefaction compressor 104, and also comprising a trimethylamine waste liquid addition component and an inert gas addition component. Since the trimethylamine in the trimethylamine waste liquid usually exists in the form of ions, a strong base (such as sodium hydroxide) is added to increase the pH value to above 12 (usually 12-14), thereby converting the ionic trimethylamine into free trimethylamine molecules. The specific reaction formula is (CH3)3NH⁺+OH⁻→(CH3)3N +H2O, free trimethylamine has a low boiling point and is highly volatile. By introducing inert gas into the wastewater, the gas-liquid equilibrium is destroyed and the trimethylamine gas dissolved in the water is forced to be blown out. This process is achieved by the alkalization gas stripping tower 101. The blown-out gas mixture (mainly inert gas, trimethylamine vapor and water vapor) needs to be further treated to obtain relatively pure trimethylamine gas. The treatment method is to use acid absorption. The acid is selected as sulfuric acid. The trimethylamine gas reacts with sulfuric acid to form water-soluble trimethylamine salt: 2(CH3)3N + H2SO4→[(CH3)3NH]2SO4. The inert gas and water vapor are discharged as tail gas from the top of the acidification absorption tower 102 and are purified and discharged after being discharged by the tail gas processor. This process is achieved by the acidification absorption tower 102. The obtained high-concentration trimethylamine sulfate absorption liquid is added to the regeneration reactor 103. The regeneration reactor 103 reacts with the sodium hydroxide contained therein, [(CH3)3NH]2SO4+ 2NaOH→2(CH3)3N+Na2SO4+2H2O, the concentration of the released trimethylamine gas is very high, and the trimethylamine gas is finally compressed and liquefied by the liquefied compressor 104. The liquefied trimethylamine is discharged through the liquid trimethylamine outlet pipe 11 and finally stored in a liquefied bottle.

[0030] In this solution, trimethylamine waste liquid refers to trimethylamine wastewater generated in the industrial production process, and trimethylamine residual liquid refers to the reaction liquid discharged into the recovery tank 2 after the trimethylamine waste liquid is treated by the alkalization gas stripping tower 101 due to the high concentration of trimethylamine in the discharged reaction liquid.

[0031] In addition, it should be noted that in order to prevent the trimethylamine waste liquid to be treated from clogging the pipeline of the device during the extraction of trimethylamine, the trimethylamine waste liquid to be treated has been subjected to impurity removal and filtration before treatment.

[0032] In order to achieve the addition of trimethylamine waste liquid and the gas stripping of trimethylamine, a trimethylamine waste liquid addition component and an inert gas addition component are further provided on the outside of the alkalization gas stripping tower 101. It can be seen that the trimethylamine waste liquid enters the bottom of the alkalization gas stripping tower 101 through the trimethylamine waste liquid addition component, and the inert gas enters the alkalization gas stripping tower 101 and / or the recovery tank body 2 through the inert gas addition component. That is, by controlling the corresponding valves, the inert gas can enter the alkalization gas stripping tower 101 and the recovery tank body 2 at the same time, or can enter either the alkalization gas stripping tower 101 or the recovery tank body 2 at the same time.

[0033] Specifically, such as Figure 1 and Figure 4 As shown, the trimethylamine waste liquid adding component includes a mixing tube 6, the gas outlet of the mixing tube 6 extending into the alkalization gas stripping tower 101 is located at the bottom of the alkalization gas stripping tower 101, a third solenoid valve 601 is connected to the tube body on one side of the mixing tube 6, a buffer is fixedly connected to the tube body on the other side of the mixing tube 6, and a trimethylamine waste liquid inlet pipe 5 is fixedly connected to one side of the buffer. The tube body of the trimethylamine waste liquid inlet pipe 5 is connected to a second solenoid valve 501 and a first liquid pump 502, and the first liquid pump 502 generates power for the flow of the trimethylamine waste liquid. The inert gas adding component includes an inert gas preparation device 3 and a gas pipeline 4, and the gas pipeline 4 is fixedly connected to the inert gas preparation device 3. Since trimethylamine gas is flammable and explosive, trimethylamine The mixture of gas and air is explosive in the volume concentration range of 4.2%-16%, so it is particularly important to choose to use inert gas. The introduction of inert gas can effectively avoid the safety hazards caused by the contact between trimethylamine gas and air. In addition, among the inert gases, considering the preparation cost, nitrogen has high preparation efficiency and low preparation cost. Therefore, in this scheme, the inert gas preparation device 3 can be a device for preparing nitrogen in the prior art or a storage bottle for storing liquid nitrogen. When the inert gas preparation device 3 is a storage bottle for storing liquid nitrogen, in order to reduce the outlet pressure, in the prior art, a safety component such as a pressure reducing valve is provided at the connection between the gas pipeline 4 and the inert gas preparation device 3 (not shown in the figure).

[0034] A first solenoid valve 401 and a booster pump 402 are connected to the pipe body of the gas pipeline 4. The gas outlet end of the gas pipeline 4 is fixedly connected to a buffer. The inner diameter of the buffer is larger than the inner diameters of the trimethylamine waste liquid inlet pipe 5 and the gas pipeline 4. The booster pump 402 provides power for the transportation of inert gas, so that the inert gas can smoothly enter the buffer and mix with the trimethylamine waste liquid. The bubbles and the trimethylamine waste liquid enter the bottom of the alkalization gas stripping tower 101 through the mixing pipe 6. The introduction of the inert gas can disrupt the gas-liquid equilibrium and forcibly blow out the free trimethylamine produced by the reaction of the trimethylamine waste liquid with the strong alkali solution. The buffer adopts a pipeline mixer 10. Its unique internal baffle structure can evenly disperse the inert gas in the trimethylamine waste liquid in the form of bubbles, greatly increasing the gas-liquid contact area, improving the gas stripping efficiency, and allowing more trimethylamine to be blown out from the waste liquid.

[0035] In this solution, the third solenoid valve 601, the second solenoid valve 501, the first liquid pump 502, the first solenoid valve 401 and the booster pump 402 are all electrically connected to the controller. In this solution, the controller controls the first solenoid valve 401, the second solenoid valve 501, the first liquid pump 502 and the booster pump 402 to open, and the trimethylamine waste liquid and the inert gas enter the mixing tube 6 through the trimethylamine waste liquid inlet pipe 5 and the gas pipeline 4 respectively. The inert gas destroys the gas-liquid equilibrium and forcibly blows out the free trimethylamine produced by the reaction of the trimethylamine waste liquid and the strong alkali solution.

[0036] like Figure 1 As shown, the recovery tank 2 is located on one side of the liquefaction compressor 104. One purpose of its setting is to improve the processing efficiency of the alkalization gas stripping tower 101 and avoid the waste of trimethylamine waste liquid. First, during the working process, the trimethylamine waste liquid to be treated will fluctuate in different concentration values ​​due to changes in front-end production factors. Reducing the concentration of the trimethylamine waste liquid to the discharge concentration before discharging and adding liquid after the waste liquid is discharged will increase the processing time of the waste liquid and reduce the processing efficiency. In order to improve the processing efficiency of the alkalization gas stripping tower 101, the reaction residue in the alkalization gas stripping tower 101 is discharged while the newly added trimethylamine waste liquid is alkalized and stripped. Second, since the trimethylamine waste liquid to be treated will fluctuate in different concentration values ​​due to changes in front-end production factors, if the trimethylamine concentration in the discharged reaction residue is high and the trimethylamine concentration is higher than the discharge concentration, the processing efficiency will be reduced.

[0037] like Figure 2As shown, a second liquid pump 901 is connected to the residual liquid discharge pipe 9 at the bottom of the alkalization gas stripping tower 101, and a trimethylamine detection spectrometer 902 is connected to the residual liquid discharge pipe 9 at the bottom of the second liquid pump 901 through a bypass pipe. A fifth electromagnetic valve 903 is connected to the bottom of the residual liquid discharge pipe 9. A residual liquid reflux pipe 904 is fixedly connected to the residual liquid discharge pipe 9 between the fifth electromagnetic valve 903 and the trimethylamine detection spectrometer 902. A sixth electromagnetic valve 905 is connected to the residual liquid reflux pipe 904, and the residual liquid reflux pipe 904 is fixedly connected to the recovery tank 2. When the residual liquid is discharged, the concentration of the discharged residual liquid is detected by the trimethylamine detection spectrometer 902. When the detected concentration value is less than the set value, such as 500-1000 mg / L, the controller controls the fifth solenoid valve 903 to open and the sixth solenoid valve 905 to close, and the residual liquid is discharged through the residual liquid discharge pipe 9. Similarly, when the detected concentration value is greater than the set value, the controller controls the fifth solenoid valve 903 to close and the sixth solenoid valve 905 to open. Under the power of the second liquid pump 901, the residual liquid is discharged into the recovery tank 2 through the residual liquid reflux pipe 904, and the residual liquid is stored in the recovery tank 2.

[0038] like Figure 4 As shown, a drain pipe 13 is fixedly connected between the recovery tank body 2 and the alkalization gas stripping tower 101. The tube body of the drain pipe 13 is connected to a third liquid pump 131 and an eighth solenoid valve 132. When the trimethylamine residual liquid stored in the recovery tank body 2 reaches a set amount, the controller controls the eighth solenoid valve 132 and the third liquid pump 131 to open. Under the power of the third liquid pump 131, the trimethylamine residual liquid enters the alkalization gas stripping tower 101 through the drain pipe 13.

[0039] like Figure 3 As shown, a pressure monitor 14 and a liquid level monitor 15 are provided on the top of the recovery tank 2. The pressure and liquid level in the recovery tank 2 are detected by the pressure monitor 14 and the liquid level monitor 15 respectively. When the pressure or liquid level exceeds the set range, the controller can take corresponding adjustment measures in time to ensure the safe and stable operation of the equipment. The top of the recovery tank 2 is fixedly connected with a vent pipe 16, which is connected to a cleaning pool or other purification equipment to adsorb the discharged trimethylamine gas and reduce environmental pollution. Pollution, a ninth solenoid valve 161, a flame arrester 162 and a one-way valve 163 are sequentially arranged in the vent pipe 16 from bottom to top. The setting of the one-way valve 163 can prevent outside air from entering the recovery tank body 2, and the flame arrester 162 can effectively prevent external fire sources from being introduced into the recovery tank body 2 to cause danger. The pipe body of the mixing pipe 6 is fixedly connected with a trimethylamine waste liquid branch pipe 8, and the pipe body of the trimethylamine waste liquid branch pipe 8 is connected with a fourth solenoid valve 801. The opening and closing of the fourth solenoid valve 801 realizes the conduction and closing of the trimethylamine waste liquid branch pipe 8.

[0040] An elbow 7 is provided on the body of the mixing tube 6, and the elbow 7 is detachably mounted on the body of the mixing tube 6 through a flange, and the trimethylamine waste liquid branch pipe 8 is fixedly connected to the bottom end of the elbow 7. The mixing tube 6 close to the alkalization gas stripping tower 101 is tilted downward. In addition, the third solenoid valve 601 is connected to the downward tilted body of the mixing tube 6. First, the existence of the elbow 7 produces a certain turbulent effect, which further promotes the mixing of the trimethylamine waste liquid and the inert gas and increases the number of bubbles in the trimethylamine waste liquid. Secondly, when the amount of trimethylamine residual liquid in the recovery tank 2 reaches the set value, the controller controls the third solenoid valve 601 and the second solenoid valve 501 to close and The fourth solenoid valve 801 is controlled to open, and the trimethylamine waste liquid on the pipe body of the mixing tube 6 near the side of the alkalization gas stripping tower 101 enters the elbow 7 under the action of gravity. The continuous input of inert gas can empty the pipeline mixer 10 and the mixing tube 6, reducing the corrosion of the pipeline mixer 10 and the mixing tube 6 by the trimethylamine waste liquid. In addition, in order to further reduce the residual waste liquid, a cavity is set on the outside of the pipeline mixer 10, and the pipeline mixer 10 is heated by the circulating hot fluid, thereby heating the inert gas. The hot gas is used to purge the pipeline, thereby promoting the evaporation of the waste liquid in the pipeline of the pipeline mixer 10 and the mixing tube 6.

[0041] During the production process, the production amount of liquid trimethylamine may fluctuate due to various factors. Due to the limited carrying capacity of liquid trimethylamine, in order to reduce the processing capacity of the device, a flow meter 111 is connected to the pipe body of the liquid trimethylamine outlet pipe 11 of the liquefied compressor 104. The flow rate of the liquid trimethylamine flowing through the liquid trimethylamine outlet pipe 11 is detected by the flow meter 111. A shunt pipe 12 is fixedly connected to the pipe body of the liquid trimethylamine outlet pipe 11 outside the flow meter 111. The gas outlet of the shunt pipe 12 is located at the bottom of the recovery tank 2, and the pipe body of the shunt pipe 12 is connected to a seventh solenoid valve 121 and an expansion valve 122. The expansion valve 122 is arranged at Between the seventh solenoid valve 121 and the recovery tank body 2, liquid trimethylamine is converted into gaseous trimethylamine through the expansion valve 122. In this way, another purpose of setting up the recovery tank body 2 is to reduce the device's processing capacity for trimethylamine waste liquid. Specifically, based on the existing device's carrying capacity for liquid trimethylamine, those skilled in the art set the flow threshold of liquid trimethylamine in the liquid trimethylamine outlet pipe 11. When the flow meter 111 detects that the flow rate of liquid trimethylamine is greater than the threshold, the controller controls the opening and closing degree of the seventh solenoid valve 121. Part of the liquid trimethylamine is vaporized through the expansion valve 122 and enters the bottom of the recovery tank body 2 and dissolves with the residual trimethylamine liquid contained in the recovery tank body 2.

[0042] As the amount of trimethylamine residual liquid contained in the recovery tank 2 increases, the air pressure in the recovery tank 2 will also increase. When the pressure monitor 14 detects that the air pressure in the recovery tank 2 reaches the set threshold, the controller controls the ninth solenoid valve 161 to open and relieve the pressure of the recovery tank 2 through the vent pipe 16.

[0043] When the liquid level monitor 15 detects that the liquid level in the recovery tank 2 reaches a set threshold, the controller controls the third solenoid valve 601, the second solenoid valve 501 and the seventh solenoid valve 121 to close and controls the fourth solenoid valve 801 and the eighth solenoid valve 132 to open, and starts the third liquid pump 131. The continuous input of inert gas can empty the pipeline mixer 10 and the mixing tube 6 and increase the air pressure in the recovery tank 2, so that the trimethylamine residual liquid in the recovery tank 2 enters the alkalization gas stripping tower 101 for reaction and gas stripping under the power of the third liquid pump 131.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A TMA residual liquid recovery tank, comprising a controller and a trimethylamine separation device consisting of an alkalization gas stripping tower (101), an acidification absorption tower (102), a regeneration reactor (103) and a liquefaction compressor (104), characterized in that: A recovery tank (2) is provided on one side of the liquefaction compressor (104); a second liquid pump (901) is connected to the residual liquid discharge pipe (9) at the bottom of the alkalization gas stripping tower (101); a trimethylamine detection spectrometer (902) is connected to the residual liquid discharge pipe (9) at the bottom of the second liquid pump (901); and a fifth solenoid valve (903) is connected to the bottom of the residual liquid discharge pipe (9); The residual liquid discharge pipe (9) located between the fifth solenoid valve (903) and the trimethylamine detection spectrometer (902) is fixedly connected to a residual liquid reflux pipe (904), the residual liquid reflux pipe (904) is connected to a sixth solenoid valve (905), and the residual liquid reflux pipe (904) is fixedly connected to the recovery tank (2); A pressure monitor (14) and a liquid level monitor (15) are provided on the top of the recovery tank (2), and the pressure and liquid level in the recovery tank (2) are detected by the pressure monitor (14) and the liquid level monitor (15), respectively. A vent pipe (16) is fixedly connected to the top of the recovery tank (2), and the vent pipe (16) is provided with a ninth solenoid valve (161), a flame arrester (162), and a one-way valve (163) in order from bottom to top; A liquid discharge pipe (13) is fixedly connected between the recovery tank (2) and the alkalization gas stripping tower (101), and a third liquid pump (131) and an eighth solenoid valve (132) are connected to the body of the liquid discharge pipe (13); A trimethylamine waste liquid addition component and an inert gas addition component are further provided on the outside of the alkalization gas stripping tower (101). The trimethylamine waste liquid enters the bottom of the alkalization gas stripping tower (101) through the trimethylamine waste liquid addition component, and the inert gas enters the alkalization gas stripping tower (101) and the recovery tank (2) through the inert gas addition component.

2. A TMA residual liquid recovery tank according to claim 1, characterized in that: The trimethylamine waste liquid addition component comprises a mixing tube (6), a third solenoid valve (601) is connected to a tube body on one side of the mixing tube (6), a buffer is fixedly connected to a tube body on the other side of the mixing tube (6), a trimethylamine waste liquid inlet pipe (5) is fixedly connected to a tube body on one side of the buffer, and a second solenoid valve (501) and a first liquid pump (502) are connected to the tube body of the trimethylamine waste liquid inlet pipe (5).

3. A TMA residual liquid recovery tank according to claim 2, characterized in that: The inert gas addition assembly comprises an inert gas preparation device (3) and a gas pipeline (4), the gas pipeline (4) being fixedly connected to the inert gas preparation device (3), the pipe body of the gas pipeline (4) being connected to a first solenoid valve (401) and a booster pump (402), the gas outlet end of the gas pipeline (4) being fixedly connected to a buffer, the pipe body of the mixing pipe (6) being fixedly connected to a trimethylamine waste liquid branch pipe (8), and the pipe body of the trimethylamine waste liquid branch pipe (8) being connected to a fourth solenoid valve (801).

4. A TMA residual liquid recovery tank according to claim 3, characterized in that: The buffer is a pipeline mixer (10), and the inert gas is dispersed in the trimethylamine waste liquid in the form of bubbles through the pipeline mixer (10).

5. A TMA residual liquid recovery tank according to claim 3, characterized in that: A bend (7) is provided on the body of the mixing tube (6), and the trimethylamine waste liquid branch pipe (8) is fixedly connected to the bottom end of the bend (7).

6. A TMA residual liquid recovery tank according to claim 3, characterized in that: The mixing pipe (6) close to the alkalization gas stripping tower (101) is tilted downward, and the third solenoid valve (601) is connected to the body of the downward tilting mixing pipe (6).

7. A TMA residual liquid recovery tank according to claim 1, characterized in that: The liquid trimethylamine outlet pipe (11) of the liquefied compressor (104) is connected to a flow meter (111). The liquid trimethylamine outlet pipe (11) located outside the flow meter (111) is fixedly connected to a shunt pipe (12). The shunt pipe (12) is connected to a seventh solenoid valve (121) and an expansion valve (122). Liquid trimethylamine is converted into gaseous trimethylamine through the expansion valve (122).

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