Recycling device for rectification residual liquid in tetrachloroethylene production

Abstract

The invention relates to the field of rectification raffinate recovery, in particular to a recovery device for rectification raffinate in tetrachloroethylene production, which comprises a lap joint base station and a waste gas collection box detachably mounted on the edge of one side of the top surface of the lap joint base station, the spraying tank is detachably mounted on the top surface of the lap-joint base and located in the middle, and the backflow mixing box is detachably mounted on the top surface of the lap-joint base and located on the edge of the other side. An alkaline solution is sprayed to the center position of the spraying tank layer by layer in cooperation with the multiple circular ring spraying rings, triple water curtains can be formed in the spraying tank through spraying of the multiple circular ring spraying rings, and a large amount of water vapor can be diffused out due to formation of the water curtains; the alkaline solution and the alkaline water vapor in each layer of water curtain can be tightly mixed with the acidic gas, so that acidic substances in the acidic waste gas are absorbed and neutralized by using sodium hydroxide or calcium hydroxide in the alkaline solution, and the effect of purifying the waste gas is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of distillation residue recovery, in particular to a device for recovering distillation residue in tetrachloroethylene production. Background Art

[0002] Tetrachloroethylene is an organic compound. It is a colorless liquid, insoluble in water, and miscible in most organic solvents such as ethanol, ether, and chloroform. It is mainly used as an organic solvent and dry cleaning agent. It can also be used as an adhesive solvent, metal degreasing solvent, desiccant, paint stripper, insect repellent, fat extractant, and organic synthesis. The distillation residue in tetrachloroethylene production needs to be recovered.

[0003] A patent with publication number CN218076437U discloses a device for recovering distillation residual liquid in tetrachloroethylene production, which belongs to the technical field of recovering distillation residual liquid in tetrachloroethylene. The device for recovering distillation residual liquid in tetrachloroethylene production includes a mounting structure and a recovery structure, the mounting structure includes a fixed tank and a support, the fixed tank is fixed on the support; the recovery structure includes a dehydrogenation part, a first distillation part and a third distillation part, a second distillation part is arranged between the first distillation part and the third distillation part, a fourth distillation assembly is arranged at the bottom of the third distillation part, the dehydrogenation part includes a dehydrogenation tank, the first distillation part includes a first distillation tank, the second distillation part includes a second distillation tank, the third distillation part includes a third distillation tank, and heaters are installed at the bottoms of the second distillation tank, the third distillation tank and the fourth distillation tank.

[0004] In the current existing technology, a certain amount of acidic waste gas will be generated inside the existing distillation residue. After being discharged, these acidic waste gases will cause certain corrosion hazards to the surrounding environment and employees. In addition, the alkaline solution will be used repeatedly, which will cause the density of the alkaline solution to be consumed excessively. At this time, the alkaline solution will be highly mixed with the acidic waste gas many times and then react to generate new salts. If these salts are directly discharged without treatment, it will affect the external environment.

[0005] To this end, the present invention provides a device for recovering distillation residue in tetrachloroethylene production. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a recovery device for distillation residual liquid in tetrachloroethylene production described in the present invention comprises a bridged grounding platform and a waste gas collecting box detachably mounted on the edge position of one side of the top surface of the bridged grounding platform, a spray tank detachably mounted on the top surface of the bridged grounding platform and located in the middle position, and a reflux mixing box detachably mounted on the top surface of the bridged grounding platform and located at the edge position of the other side, the inner wall surface of the spray tank is provided with multiple annular spray rings at three positions of upper, middle and lower, the inner wall surface of the spray tank is provided with a funnel plate fixedly mounted on the bottom edge position, and the position of the funnel plate is set at the bottom edge position of the multiple annular spray rings, an air guide pipe is fixedly mounted on the bottom surface of the funnel plate and located in the middle position, and the other end of the air guide pipe extends to the outer bottom edge position of the spray tank; a second motor is fixedly mounted on the inner edge position of the bottom of the reflux mixing box, and a stirring blade is fixedly connected to the outer surface of the output end of the second motor.

[0008] Preferably, the interior of the reflux mixing box is filled with an alkaline solution, and a filter plate is movably sleeved on the inner wall of the reflux mixing box at the top edge of the stirring blade.

[0009] Preferably, a circulation heater is fixedly mounted on the outer surface of the reflux mixing box and located at the top edge of the filter plate, and a U-shaped flow guide tube movably sleeved on the inner wall of the reflux mixing box is fixedly connected to the output end of the circulation heater.

[0010] Preferably, a plurality of liquid guide tubes 1 are fixedly mounted on the other side surface of the reflux mixing box, and a liquid guide tube 2 arranged on the outer surface of the multiple annular spray ring is detachably mounted on one end of the liquid guide tube 1.

[0011] Preferably, a liquid inlet pipe is fixedly installed on one side surface of the waste gas collecting box and located at the top edge position, and a liquid discharge pipe is fixedly connected to the other side surface of the waste gas collecting box and located at the bottom edge position.

[0012] Preferably, an exhaust pipe arranged on one end of the air guide pipe is fixedly connected to the top surface of the exhaust gas collecting box and located in the middle position, and a motor is fixedly installed on one side surface of the exhaust gas collecting box.

[0013] Preferably, the output end of the motor 1 extends through the exhaust gas collection box to the inner wall, and the output end of the motor 1 is fixedly connected to a stirring blade movably sleeved on the inner wall of the exhaust gas collection box, and a transmission belt is movably sleeved on the outer surface of the output end of the motor 1.

[0014] Preferably, an exhaust head is provided on the top surface of the spray tank and at a middle position, and a liquid return pipe extending to the outer surface of the spray tank is fixedly installed on the bottom surface of the funnel plate and at a side edge position of the air guide pipe, and the other end of the liquid return pipe is fixedly connected to the outer surface of the reflux mixing box.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The device for recovering distillation residue in tetrachloroethylene production of the present invention comprises: when the air guide pipe guides the acidic gas in the distillation liquid into the spray tank, the multiple annular spray rings are used to spray the alkaline solution layer by layer toward the center of the spray tank, and the spraying of the multiple annular spray rings will form a triple water curtain inside the spray tank, and a large amount of water vapor will diffuse out when the water curtain is formed. The alkaline solution and alkaline water vapor in each layer of the water curtain will be closely mixed with the acidic gas, so that the acidic gas is gradually absorbed and neutralized, so that the sodium hydroxide or calcium hydroxide in the alkaline solution is used to absorb and neutralize the acidic substances in the acidic waste gas, thereby achieving the effect of purifying the waste gas;

[0017] 2. A device for recovering distillation residue in tetrachloroethylene production according to the present invention, wherein the neutralized liquid vapor falls downward, and the arc-shaped groove on the surface of the funnel plate is used to collect the alkaline solution. The alkaline solution accumulated on the top of the funnel plate is recovered through the liquid reflux pipe on the bottom surface of the funnel plate, and the alkaline solution is recovered into the interior of the reflux mixing box, and then the interior of the reflux mixing box is infused with a new alkaline solution. At this time, the stirring blades of the second motor are rotated to mix the neutralized alkaline solution and the new alkaline solution, thereby maintaining the density of the alkaline solution, thereby achieving the effect of repeatedly infusing the alkaline solution with a new alkaline solution to maintain the optimal reaction density of the alkaline solution;

[0018] 3. The device for recovering the residual liquid of distillation in the production of tetrachloroethylene described in the present invention performs distillation treatment on tetrachloroethylene through a distillation kettle, recovers the residual liquid produced by the distillation of the distillation kettle, and guides the distillation liquid into the interior of a waste gas collection box through a liquid inlet pipe, and injects a catalyst into the interior of the waste gas collection box. At this time, a pair of stirring blades are rotated in cooperation with a motor, so that the stirring blades are turned over inside the waste gas collection box, and the distillation liquid and the catalyst inside the waste gas collection box are stirred and mixed. At the same time, the catalyst is used to promote the volatilization of the acid gas remaining inside the distillation liquid and on the liquid surface. The volatilized acid gas will accumulate on the inner wall surface of the top of the waste gas collection box. At this time, the acid gas is extracted through the exhaust pipe, and the acid gas is guided into the interior of the air guide pipe, and the catalyzed distillation liquid is recovered through the discharge pipe, so that the distillation liquid is stirred and mixed by the stirring device, so that the distillation liquid and the catalyst liquid are fully mixed and the acid gas is catalyzed out, thereby greatly reducing the effect of the acid gas inside the distillation liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a stereogram of the present invention;

[0021] Figure 2 is a cutaway perspective view of the exhaust gas collection box of the present invention;

[0022] Figure 3 is a cutaway perspective view of a reflux mixing box in the present invention;

[0023] Figure 4 It is a partial cutaway stereoscopic view of the spray tank in the present invention;

[0024] Figure 5 is a cutaway perspective view of a spray tank in the present invention;

[0025] Figure 6 It is a three-dimensional diagram of the exhaust gas collection box in the present invention;

[0026] Figure 7 It is a sectional stereoscopic view of the exhaust gas collecting box in the present invention.

[0027] In the figure: 11, grounding base; 12, exhaust gas collection box; 121, drain pipe; 122, liquid inlet pipe; 123, exhaust pipe; 124, motor one; 125, drive track; 126, stirring blade; 13, spray tank; 131, multiple circular ring spray ring; 132, funnel plate; 133, air guide pipe; 134, liquid reflux pipe; 135, exhaust head; 14, reflux mixing box; 141, filter plate; 142, motor two; 143, stirring blade; 144, liquid guide pipe one; 145, circulation heater; 146, U-shaped guide pipe; 147, liquid guide pipe two. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] like Figures 1 to 7 As shown, a device for recovering distillation residue in tetrachloroethylene production according to an embodiment of the present invention comprises a grounding base 11 and a waste gas collecting box 12 detachably mounted on one side edge position of the top surface of the grounding base 11, a spray tank 13 detachably mounted on the top surface of the grounding base 11 and located in the middle position, a reflux mixing box 14 detachably mounted on the top surface of the grounding base 11 and located at the other side edge position, and multiple annular spray rings 131 are mounted on the inner wall of the spray tank 13 at three positions, namely, the upper, middle and lower positions. A funnel plate 132 is fixedly installed on the inner wall of the spray tank 13 and located at the bottom edge position, and the position of the funnel plate 132 is set at the bottom edge position of the multiple annular spray ring 131, and an air guide pipe 133 is fixedly installed on the bottom surface of the funnel plate 132 and located at the middle position, and the other end of the air guide pipe 133 extends to the outer bottom edge position of the spray tank 13; a motor 2 142 is fixedly installed on the inner edge position of the bottom of the reflux mixing box 14, and a stirring blade 143 is fixedly connected to the outer surface of the output end of the motor 2 142.

[0030] When the air guide pipe 133 guides the acidic gas in the distillation liquid into the spray tank 13, the multiple annular spray rings 131 are used to spray the alkaline solution layer by layer toward the center of the spray tank 13. The spraying of the multiple annular spray rings 131 forms a triple water curtain inside the spray tank 13. The formation of the water curtain will cause a large amount of water vapor to diffuse out. The alkaline solution and alkaline water vapor in each layer of the water curtain will be closely mixed with the acidic gas, so that the acidic gas is gradually absorbed and neutralized, so that the sodium hydroxide or calcium hydroxide in the alkaline solution is used to absorb and neutralize the acidic substances in the acidic waste gas, thereby achieving the effect of purifying the waste gas, and avoiding the acidic gas from causing acidic harm to the surrounding environment and employees after being diffused out.

[0031] The neutralized liquid water vapor will fall downward, and the arc-shaped groove on the surface of the funnel plate 132 will collect the alkaline solution. At this time, the alkaline solution accumulated on the top of the funnel plate 132 will be recovered through the liquid reflux pipe 134 on the bottom surface of the funnel plate 132, and the alkaline solution will be recovered into the reflux mixing box 14, and then the reflux mixing box 14 will be infused with new alkaline solution. At this time, the stirring blade 143 will be rotated by the motor 2 142 to mix the neutralized alkaline solution and the new alkaline solution together, thereby maintaining the density of the alkaline solution, achieving the effect of multiple infusions of new alkaline solution into the alkaline solution to maintain the optimal reaction density of the alkaline solution, avoiding the multiple mixing reactions between the two after the highly neutralized acidic exhaust gas to generate new salts. If these salts are discharged directly without treatment, they may cause secondary pollution to the water body, change the pH value of the water body, and affect the survival of aquatic organisms.

[0032] like Figures 1 to 7 As shown, a liquid inlet pipe 122 is fixedly installed on one side surface of the exhaust gas collection box 12 and located at the top edge position, a liquid discharge pipe 121 is fixedly connected to the other side surface of the exhaust gas collection box 12 and located at the bottom edge position, and an exhaust pipe 123 arranged on one end of the air guide pipe 133 is fixedly connected to the top surface of the exhaust gas collection box 12 and located at the middle position, and a motor 124 is fixedly installed on one side surface of the exhaust gas collection box 12, and the output end of the motor 124 extends through the exhaust gas collection box 12 to the inner wall surface, and the motor 124 A stirring blade 126 is fixedly connected to the output end and movably sleeved on the inner wall of the exhaust gas collecting box 12. A transmission track 125 is movably sleeved on the outer surface of the output end of the motor 124. An exhaust head 135 is provided on the top surface of the spray tank 13 and at a middle position. A liquid reflux pipe 134 extending to the outer surface of the spray tank 13 is fixedly installed on the bottom surface of the funnel plate 132 and at a side edge position of the air guide pipe 133, and the other end of the liquid reflux pipe 134 is fixedly connected to the outer surface of the reflux mixing box 14.

[0033] The tetrachloroethylene is distilled by the distillation kettle, and the residual liquid produced by the distillation of the distillation kettle is recovered, and the distilled liquid is guided into the interior of the waste gas collection box 12 through the liquid inlet pipe 122, and the catalyst is infused into the interior of the waste gas collection box 12. At this time, the stirring blade 126 is rotated by the motor 124, so that the stirring blade 126 is turned over in the waste gas collection box 12, and the distilled liquid and the catalyst in the waste gas collection box 12 are stirred and mixed. At the same time, the catalyst is used to promote the volatilization of the acid gas remaining in the distilled liquid and on the surface of the liquid, and the volatilized acid gas will accumulate in the waste gas collection box 1 2, the acid gas is extracted through the exhaust pipe 123, and the acid gas is guided into the interior of the air guide pipe 133, and the catalyzed distillation liquid is recovered through the discharge pipe 121, so that the distillation liquid is stirred and mixed by the stirring device, so that the distillation liquid and the catalytic liquid are fully mixed and the acid gas is catalyzed out, thereby greatly reducing the acid gas in the distillation liquid; avoiding the traditional distillation liquid when it is recovered, there will be a certain amount of acid gas inside, when the distillation liquid is recovered, these acid gases will diffuse out, and then cause pollution to the surrounding environment.

[0034] like Figures 1 to 5 As shown, the interior of the reflux mixing box 14 is filled with an alkaline solution, a filter plate 141 is movably mounted on the inner wall of the reflux mixing box 14 and at the top edge of the stirring blade 143, a circulation heater 145 is fixedly installed on the outer surface of the reflux mixing box 14 and at the top edge of the filter plate 141, a U-shaped guide tube 146 movably mounted on the inner wall of the reflux mixing box 14 is fixedly connected to the output end of the circulation heater 145, and a plurality of liquid guide tubes 144 are fixedly mounted on the other side surface of the reflux mixing box 14, and one end of the liquid guide tube 144 is detachably mounted with a liquid guide tube 2 147 arranged on the outer surface of the multiple annular spray ring 131.

[0035] As the alkaline solution continues to rise inside the reflux mixing box 14, the filter plate 141 is used to filter the impurities neutralized by the reaction inside the alkaline solution. At this time, the circulating heater 145 is used to circulate and infuse the high-temperature liquid into the U-shaped guide tube 146, so that the rising alkaline solution is fully in contact with the U-shaped guide tube 146, and then the alkaline solution is heated. Due to the difference in the liquid rising speed and the contact time between the U-shaped guide tube 146, the temperature of the alkaline solution at the highest point inside the reflux mixing box 14 is much higher than the temperature of the alkaline solution at the bottom. Alkaline solutions of different temperatures are then extracted through the liquid guide tubes 144 at different heights, and then the alkaline solutions of different high temperatures are infused into the multiple circular spray rings 131, so that the multiple circular spray rings 131 at different heights will spray out alkaline solutions of different temperatures. The alkaline solutions at different temperatures will have different neutralization speeds, and then the acidic solutions at different positions are neutralized in layers.

[0036] Working principle: tetrachloroethylene is distilled through a distillation kettle, and the residual liquid produced by the distillation of the distillation kettle is recovered, and the distilled liquid is guided into the interior of the waste gas collection box 12 through the liquid inlet pipe 122, and the catalyst is infused into the interior of the waste gas collection box 12. At this time, the stirring blade 126 is rotated in conjunction with the motor 124, so that the stirring blade 126 is turned over in the waste gas collection box 12, and the distilled liquid and the catalyst in the waste gas collection box 12 are stirred and mixed, and at the same time, the catalyst is used to promote the volatilization of the acid gas remaining in the distilled liquid and on the surface of the liquid. The acidic gas will accumulate on the top inner wall of the waste gas collection box 12. At this time, the acidic gas is extracted through the exhaust pipe 123 and directed into the interior of the air guide pipe 133. The catalyzed distilled liquid is then recovered through the drain pipe 121. The distilled liquid is stirred and mixed by the stirring device, so that the distilled liquid and the catalytic liquid are fully mixed and the acidic gas is catalyzed out, thereby greatly reducing the acidic gas in the distilled liquid. When the air guide pipe 133 directs the acidic gas in the distilled liquid into the spray tank 13, the multiple annular spray rings 131 are used to The alkaline solution is sprayed layer by layer toward the center of the spray tank 13, and the spraying of the multiple annular spray rings 131 will form a triple water curtain inside the spray tank 13. When a water curtain is formed, a large amount of water vapor will diffuse out. The alkaline solution and alkaline water vapor in each layer of the water curtain will be closely mixed with the acidic gas, so that the acidic gas is gradually absorbed and neutralized, so that the sodium hydroxide or calcium hydroxide in the alkaline solution is used to absorb and neutralize the acidic substances in the acidic waste gas, thereby achieving the effect of purifying the waste gas; and the neutralized liquid water vapor will fall downward, and at this time, the arc-shaped groove on the surface of the funnel plate 132 will be used to absorb the alkaline solution. The alkaline solution is collected, and the alkaline solution accumulated on the top of the funnel plate 132 is recovered through the liquid reflux pipe 134 on the bottom surface of the funnel plate 132, and the alkaline solution is recovered into the inside of the reflux mixing box 14, and then the inside of the reflux mixing box 14 is infused with a new alkaline solution. At this time, the stirring blade 143 is rotated by the motor 2 142 to mix the neutralized alkaline solution and the new alkaline solution together, thereby maintaining the density of the alkaline solution, achieving the effect of repeatedly infusing the alkaline solution with a new alkaline solution, so as to maintain the optimal reaction density of the alkaline solution;As the alkaline solution continues to rise inside the reflux mixing box 14, the filter plate 141 is used to filter the impurities reacted and neutralized inside the alkaline solution. At this time, the circulating heater 145 is used to circulate and infuse the high-temperature liquid into the U-shaped guide tube 146, so that the rising alkaline solution is fully in contact with the U-shaped guide tube 146, and then the alkaline solution is heated. Due to the different liquid rising speed and the contact time between the U-shaped guide tube 146, the alkaline solution temperature at the highest point inside the reflux mixing box 14 is much higher than the alkaline solution temperature at the bottom. Then, alkaline solutions of different temperatures are extracted through the guide tubes 144 at different heights, and then alkaline solutions of different temperatures are infused into the multiple annular spray rings 131, so that the multiple annular spray rings 131 at different heights will spray out alkaline solutions of different temperatures. The alkaline solutions at different temperatures will have different neutralization speeds, and then the acidic solutions at different positions are neutralized in layers. ;

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for recovering distillation residue in tetrachloroethylene production, comprising a grounding base (11) and a waste gas collecting box (12) detachably mounted on one side edge of the top surface of the grounding base (11), a spray tank (13) detachably mounted on the top surface of the grounding base (11) and located in the middle, and a reflux mixing box (14) detachably mounted on the top surface of the grounding base (11) and located at the other side edge, characterized in that: The inner wall surface of the spray tank (13) is provided with multiple circular spray rings (131) at three positions, upper, middle and lower. The inner wall surface of the spray tank (13) is provided with a funnel plate (132) fixedly installed at the bottom edge position. The funnel plate (132) is arranged at the bottom edge position of the multiple circular spray rings (131). The bottom surface of the funnel plate (132) is provided with an air guide pipe (133) fixedly installed at the middle position. The other end of the air guide pipe (133) extends to the outer bottom edge position of the spray tank (13). The second motor (142) is fixedly installed at the inner edge position of the bottom of the reflux mixing box (14). The outer surface of the output end of the second motor (142) is fixedly connected with a stirring blade (143).

2. The device for recovering distillation residue in tetrachloroethylene production according to claim 1, characterized in that: The interior of the reflux mixing box (14) is filled with an alkaline solution, and a filter plate (141) is movably sleeved on the inner wall of the reflux mixing box (14) and located at the top edge of the stirring blade (143).

3. The device for recovering distillation residue in tetrachloroethylene production according to claim 2, characterized in that: A circulation heater (145) is fixedly mounted on the outer surface of the reflux mixing box (14) and located at the top edge of the filter plate (141); a U-shaped flow guide pipe (146) movably sleeved on the inner wall of the reflux mixing box (14) is fixedly connected to the output end of the circulation heater (145).

4. The device for recovering distillation residue in tetrachloroethylene production according to claim 3, characterized in that: A plurality of liquid guide tubes 1 (144) are fixedly mounted on the other side surface of the reflux mixing box (14), and a liquid guide tube 2 (147) arranged on the outer surface of the multiple annular spray ring (131) is detachably mounted on one end of the liquid guide tube 1 (144).

5. The device for recovering distillation residue in tetrachloroethylene production according to claim 4, characterized in that: A liquid inlet pipe (122) is fixedly installed on one side surface of the waste gas collection box (12) and located at the top edge position, and a liquid discharge pipe (121) is fixedly connected to the other side surface of the waste gas collection box (12) and located at the bottom edge position.

6. The device for recovering distillation residue in tetrachloroethylene production according to claim 5, characterized in that: An exhaust pipe (123) arranged on one end of an air guide pipe (133) is fixedly connected to the top surface of the waste gas collection box (12) and located in the middle position, and a motor (124) is fixedly installed on one side surface of the waste gas collection box (12).

7. The device for recovering distillation residue in tetrachloroethylene production according to claim 6, characterized in that: The output end of the motor 1 (124) extends through the waste gas collection box (12) to the inner wall surface, and a stirring blade (126) movably sleeved on the inner wall surface of the waste gas collection box (12) is fixedly connected to the output end of the motor 1 (124), and a transmission crawler (125) movably sleeved on the outer surface of the output end of the motor 1 (124).

8. The device for recovering distillation residue in tetrachloroethylene production according to claim 1, characterized in that: An exhaust head (135) is provided on the top surface of the spray tank (13) and at a middle position, and a liquid return pipe (134) extending to the outer surface of the spray tank (13) is fixedly installed on the bottom surface of the funnel plate (132) and at a side edge position of the air guide pipe (133), and the other end of the liquid return pipe (134) is fixedly connected to the outer surface of the return mixing box (14).

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