Rectification dehydration device and method for preparing trimethyl borate

Abstract

The invention relates to the technical field of trimethyl borate processing, in particular to a rectification dehydration device and method for trimethyl borate preparation. The dehydration device comprises a supporting plate, a distillation retort and a dehydration box, a gas guide box is communicated between the distillation retort and the dehydration box, a condensation plate is arranged on the inner wall of the gas guide box, and a liquid collection bin and a dehydration bin communicated with the stock solution bin are further arranged in the dehydration box; in the liquid storage stage, a pushing mechanism is arranged in the dewatering bin, and a reciprocating mechanism is arranged below the pushing mechanism. Static pressure generated when the liquid level in a stock solution bin rises serves as power to drive a pushing plate to move downwards, the pushing plate moves downwards to force stripping plates on the two sides to move relatively to be separated, the stripping plates strip an upper-layer solution and transfer the upper-layer solution into a liquid collecting bin, preliminary stripping is achieved, meanwhile, a bearing plate presses air into an air cushion, and the air cushion is forced to expand; the liquid level of the upper-layer solution in the dewatering bin rises and appears on the stripping path of the stripping plate, so that the stripping effect on the upper-layer solution is improved, and waste is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of trimethyl borate processing, in particular to a rectification dehydration device and method for trimethyl borate preparation. BACKGROUND

[0002] Trimethyl borate is prepared by the mutual reaction of boric acid and methanol, and can be used as a solvent, a fire retardant for plastics, paint, spray paint, etc., and a fumigant for lemon fruits, etc.

[0003] A kind of water removal device for trimethyl borate production is disclosed in Chinese patent publication No. CN212119098U, which includes a cylinder, four corners of the lower side of the cylinder are fixedly connected with support columns, the lower ends of the support columns are fixedly connected with anti-skid pads, a stirring chamber is provided in the cylinder, a fixed frame is fixedly connected to the upper side of the cylinder, a motor is fixedly installed on the fixed frame, and the output end of the motor is fixedly connected with a rotating rod through the cylinder, a plurality of stirring rods are fixedly connected to the outer wall of the rotating rod, a discharge pipe is provided on one side of the motor and fixedly connected to the upper side of the cylinder, a water removal device for trimethyl borate production, which uses a water pump to pump the liquid at the lower end of the stirring chamber into the liquid pumping pipe, and then is dispersed by a plurality of nozzles on the spray head, the connecting pipe is provided with a plurality of nozzles, so that the dehydration agent can effectively remove water from the trimethyl borate.

[0004] Secondly, the existing trimethyl borate is also used to separate the difference in solubility of trimethyl borate and water in a certain extractant during dehydration, by selecting a suitable extractant, trimethyl borate is preferentially dissolved therein, while water remains in the original phase, and two-phase separation achieves the separation purpose.

[0005] In order to avoid the scraper extending into the lower layer of water, the scraper is usually kept a distance from the water surface, which can avoid the peeled upper layer solution containing a large amount of water, and at the same time, a layer of upper layer solution is left on the water surface during peeling, so that part of the upper layer solution is discharged with water each time, which cannot be effectively collected, causing resource waste. SUMMARY

[0006] The present application provides a rectification dehydration device for trimethyl borate preparation, which uses the static pressure of the liquid level rise in the original liquid bin as power to drive the push plate to move down, the push plate moves down to force the two side stripping plates to move relatively and separate, and the stripping plate peels off and transfers the upper layer solution to the liquid collecting bin, thereby solving the problems raised in the above background art, i.e.: To achieve the above purpose, the rectification dehydration device for trimethyl borate preparation includes a support plate, a distillation tank and a dehydration tank, a gas guide box is communicated between the distillation tank and the dehydration tank, a condensation plate is arranged on the inner wall of the gas guide box, and the end of the gas guide box extends into the original liquid bin formed in the dehydration tank; The dehydration tank is internally provided with a liquid collection bin and a dehydration bin in communication with the raw liquid bin, and the liquid collection bin is used for collecting the upper liquid from the dehydration bin; In the dehydration bin, a pushing mechanism is arranged, and a reciprocating mechanism is arranged below the pushing mechanism, the reciprocating mechanism comprises a stripping plate which moves horizontally in the dehydration bin directly below the pushing mechanism, and a bearing plate which moves longitudinally in the liquid collection bin, and the bearing plate is in communication with an air cushion arranged at the bottom of the dehydration bin, in the stripping stage, the pushing mechanism drives the two stripping plates to move relatively by using the buoyancy, the stripping plates are responsible for stripping and transferring the upper solution to the liquid collection bin according to a preset trajectory, and the upper solution exerts pressure on the bearing plate in the stripping stage, so that the air cushion is inflated to realize that the liquid level of the upper solution is raised and appears on the stripping path of the stripping plate.

[0007] The pushing mechanism comprises a pushing plate arranged in the dehydration bin, the bottom of the pushing plate is conical, and the pushing plate is used for driving the two stripping plates to move relatively along the slope of the pushing plate, guide blocks are fixedly arranged on the stripping plates corresponding to the bottom of the pushing plate, and the guide blocks are outwardly inclined to form an inclination angle for receiving the bottom of the pushing plate.

[0008] The stripping plate is L-shaped, the vertical end of the stripping plate penetrates the side plate of the dehydration bin, elastic tension springs are elastically connected between the vertical end and the side plate, and the other end of the stripping plate extends downward into the upper solution, so as to strip the upper solution from the dehydration bin.

[0009] A floating plate is arranged in the raw liquid bin, one end of a bent rod is rotatably arranged at the top of the floating plate, the other end of the bent rod abuts against a vertical rod, and the bent rod is arranged on the side plate and rotatably connected with the side plate.

[0010] Specific dehydration process: the bearing plate moves downward to force the pressure in the liquid collection bin below the bearing plate to increase, thus, as the upper solution in the dehydration bin is gradually stripped, the weight of the liquid in the dehydration bin is reduced, the pressure of the liquid in the dehydration bin on the air cushion is weakened, and the liquid level in the dehydration bin is raised through the inflation of the air cushion, thus, the upper liquid level which is not touched by the stripping plate is raised and is on the horizontal moving path of the stripping plate, so as to be stripped by the stripping plate, the stripping effect of the upper solution is improved, and the water content of the solution is reduced.

[0011] The second object of the present application is to provide a dehydration method for a rectification dehydration device for preparing trimethyl borate, comprising the following method steps: S1, when the mixed liquid in the raw liquid bin is injected into the dehydration bin, an extractant is injected into the dehydration bin and reacts and stands for a period of time, so that the mixed liquid is stratified, that is, the upper layer is trimethyl borate, and the lower layer is water; S2, the static pressure of the liquid level rising in the raw liquid bin is used as power to drive the pushing plate to move downward, the pushing plate moves downward to force the two stripping plates to move relatively and separate, and the stripping plates strip and transfer the upper solution to the liquid collection bin, to realize preliminary stripping; S3, and the bearing plate pressurizes air into the air cushion and forces the air cushion to expand, so that the upper layer solution level in the dewatering bin is raised and appears on the stripping path of the stripping plate, to realize stripping of the upper layer solution.

[0012] Compared with the prior art, the present application has the following beneficial effects: In the storage stage, the static pressure of the liquid level rise in the raw liquid bin is used as power to drive the pushing plate to move downward, the pushing plate moves downward to force the two stripping plates to move relatively and separate, the stripping plate strips and transfers the upper layer solution to the liquid collecting bin, to realize preliminary stripping, and at the same time, the bearing plate pressurizes air into the air cushion and forces the air cushion to expand, so that the upper layer solution level in the dewatering bin is raised and appears on the stripping path of the stripping plate, thereby improving the stripping effect of the upper layer solution and reducing waste. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a front view of the cut internal structure of the dewatering bin of the present application; Figure 3 It is an exploded structure schematic diagram of the movable plate and the stripping plate of the present application; Figure 4 It is a schematic diagram of the relative motion principle structure of the two stripping plates of the present application; Figure 5 It is a right view of the connection structure of the stripping plate, the stop plate and the side plate of the present application; Figure 6 It is an enlarged structure schematic diagram of A in the present application; Figure 4 Figure 7 It is a principle structure schematic diagram of the raw liquid bin supplying mixed liquid into the dewatering bin of the present application.

[0014] The meanings of the various reference numerals in the drawings are as follows: 100, support plate; 101, distillation tank; 102, air guide box; 103, condensing plate; 104, drain pipe; 105, liquid discharge pipe; 110, dewatering bin; 111, raw liquid bin; 111a, water guide pipe; 112, dewatering bin; 112a, liquid injection channel; 112b, liquid discharge cavity; 113, liquid collecting bin; 120, pushing mechanism; 121, pushing plate; 122, movable plate; 123, lever; 124, floating plate; 130, stripping plate; 130a, guide block; 130b, tension spring; 131, bearing plate; 132, stop plate; 140, air cushion; 141, liquid guide plate; 142, compression spring. DETAILED DESCRIPTION

[0015] ​With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0016] In order to avoid the scraper extending into the lower layer water, the scraper is usually kept a distance from the water surface, which can avoid the peeled upper layer solution containing a large amount of water, and at the same time, a layer of upper layer solution is left on the water surface during peeling, so that part of the upper layer solution is discharged with water each time, which cannot be effectively collected, causing resource waste. The present application provides a rectification dehydration device for trimethyl borate preparation, as shown in Figures 1-3 The rectification dehydration device for trimethyl borate preparation includes a support plate 100, a distillation tank 101 and a dehydration tank 110. A gas guide box 102 is in communication between the distillation tank 101 and the dehydration tank 110. A condensation plate 103 is arranged on the inner wall of the gas guide box 102. The end of the gas guide box 102 extends into a raw liquid bin 111 formed in the dehydration tank 110, so that the gas evaporated in the distillation tank 101 is condensed by the condensation plate 103, and the condensed liquid is collected for later use. The dehydration tank 110 also has a liquid collecting bin 113 and a dehydration bin 112 in communication with the raw liquid bin 111. When the mixed liquid in the raw liquid bin 111 is injected into the dehydration bin 112, an extractant is injected into the dehydration bin 112 through a liquid injection port (refer to Figure 2 The mixed liquid is allowed to stratify after a period of reaction and standing, i.e. the upper layer is trimethyl borate and the lower layer is water (as shown in Figure 2 The liquid collecting bin 113 is used to collect the upper layer liquid from the dehydration bin 112. The specific working process of dehydration is shown below. First, after the mixed liquid in the dehydration bin 112 stratifies, the raw liquid bin 111 is in the liquid storage stage. During this process, a push mechanism 120 is arranged in the dehydration bin 112. A reciprocating mechanism is arranged below the push mechanism 120. The reciprocating mechanism includes a stripping plate 130 arranged below the push mechanism 120 in the dehydration bin 112 for horizontal movement, and a bearing plate 131 arranged in the liquid collecting bin 113 for vertical movement. The bearing plate 131 is in communication with an air cushion 140 arranged at the bottom of the dehydration bin 112. During the upper layer solution stripping stage, the push mechanism 120 drives the two stripping plates 130 to move relative to each other by using the buoyancy. Based on the above diagram and in combination with Figure 4As shown, the stripping plate 130 is responsible for stripping and transferring the upper layer solution into the liquid collection bin 113 according to the preset trajectory, and the upper layer solution exerts pressure on the bearing plate 131 during the stripping stage, forcing the air cushion 140 to expand, so as to raise the liquid level of the upper layer solution and appear on the stripping path of the stripping plate 130, thereby improving the stripping effect of the upper layer solution and reducing waste.

[0017] When the liquid storage bin 111 is in the liquid storage stage, the pushing mechanism 120 includes a pushing plate 121 located in the dehydration bin 112, the bottom of the pushing plate 121 is tapered, and is used to drive the two side stripping plates 130 to move relative to the inclined surface of the pushing plate 121, and the stripping plate 130 corresponding to the bottom of the pushing plate 121 is fixedly provided with a guide block 130a, and the two side guide blocks 130a are outwardly inclined to form an inclination angle for receiving the bottom of the pushing plate 121; the purpose of this is: when the pushing plate 121 moves downward, the inclined surface of the pushing plate 121 exerts pressure on the guide block 130a, the guide block 130a guides the inclined surface of the pushing plate 121 into the inclination angle, and as the pushing plate 121 is pressed downward, the two side stripping plates 130 move horizontally and move away from each other, and during this process, since the stripping plate 130 is "L" shaped, its vertical end penetrates the side plate of the dehydration bin 112, and a tension spring 130b is elastically connected between the vertical end and the side plate, when the stripping plate 130 moves horizontally, it needs to overcome the elastic potential energy of the tension spring 130b, and the other end extends downward into the upper layer solution for stripping the upper layer solution from the dehydration bin 112; Secondly, the power source of the pushing plate 121 comes from: a floating plate 124 is arranged in the liquid storage bin 111, one end of a lever 123 is rotatably arranged on the top of the floating plate 124, the other end of the lever 123 abuts against a vertical rod, and the lever 123 is rotatably connected with the side plate and rests on the side plate, thereby forming a lever, when the liquid storage bin 111 is in the liquid storage stage, the liquid level in the liquid storage bin 111 rises and drives the floating plate 124 to float upward, and the lever 123 is in a state of one end being raised and the other end being sunken (see Figure 4 As shown), at this time, since the bottom of the vertical rod is fixed with a movable plate 122 between the pushing plate 121, and the movable plate 122 is movably arranged in the dehydration bin 112, the sunken end exerts pressure on the vertical rod, drives the pushing plate 121 to move downward and separates the two side stripping plates 130, thereby realizing the stripping work of the upper layer solution.

[0018] That is, during the liquid storage stage, the static pressure of the rising liquid level in the liquid storage bin 111 is used as power to drive the pushing plate 121 to move downward, the pushing plate 121 moves downward to force the two side stripping plates 130 to move relative to each other and separate, the stripping plate 130 strips and transfers the upper layer solution into the liquid collection bin 113, realizes the preliminary stripping, and at the same time, the bearing plate 131 forces air into the air cushion 140 and forces the air cushion 140 to expand, so as to raise the liquid level of the upper layer solution in the dehydration bin 112 and appear on the stripping path of the stripping plate 130, thereby improving the stripping effect of the upper layer solution and reducing waste.

[0019] Returning to Figure 4 and in combination Figure 6 As shown in the side plate inside the fit is provided with a guide plate 141, the guide plate 141 bottom and side plate between the elastic connection with the support plate 131 of the compression spring 142, the guide plate 141 top with the stripping plate 130 fixed stop plate 132, stop plate 132 end is smooth to make the guide plate 141 smoothly into the stop plate 132 on; need to explain: reference Figure 5 As shown in the stop plate 132 of the wide end is less than the stripping plate 130, the side plate on the channel for the stop plate 132 sliding, so in the initial state, both sides of the stripping plate 130 in the closed state, and the stop plate 132 at this time and the channel is separated, stripping plate 130 both ends are on the side plate to provide support for the stop plate 132; Secondly, because trimethyl borate has a certain volatility, in the reaction process, if not to keep sealed, it will gradually evaporate into the air, resulting in the amount of raw materials decreases, the stripping plate 130 in the initial state to keep fit, form a seal to limit trimethyl borate, reduce evaporation.

[0020] On the other hand, the guide plate 141 has several guide grooves, the side plate has the same size of the liquid discharge groove, the initial stage, the guide groove and the liquid discharge groove are in the offset state, the stripping stage, the guide groove and the liquid discharge groove are in the alignment state; specific in work: Initially, the stop plate 132 and the guide plate 141 top separate, with the stripping plate 130 outward expansion, the guide plate 141 gradually slide into the stop plate 132, in the process, between the stripping plate 130 and the side plate form a liquid discharge cavity 112b, the liquid discharge cavity 112b for accommodating the upper layer solution to be stripped by the stripping plate 130, and with the stripping plate 130 distance increases, the liquid discharge cavity 112b gradually reduces, when the guide groove and the liquid discharge groove from the offset state to the alignment state, the upper layer solution in the liquid discharge cavity 112b is discharged to the liquid collection bin 113 through the guide groove and the liquid discharge groove, the support plate 131 supports the upper layer solution, so that the liquid level on the support plate 131 gradually rises, the weight increases; The bearing plate 131 is in sleeved fit with the inner wall of the liquid collecting bin 113, and the support plate 100 is provided with a liquid discharging pipe 105 communicating with the liquid collecting bin 113 and a water discharging pipe 104 communicating with the dehydration bin 112. When the bearing plate 131 moves downward, the pressure in the liquid collecting bin 113 below the bearing plate 131 increases. As the upper layer solution in the dehydration bin 112 is gradually stripped, the weight of the liquid in the dehydration bin 112 decreases, and the pressure of the liquid in the dehydration bin 112 on the air cushion 140 decreases. The liquid level in the dehydration bin 112 is raised by the expansion of the air cushion 140. Thus, the upper layer solution that is not touched by the stripping plate 130 is raised and is in the path of the horizontal movement of the stripping plate 130, and is stripped by the stripping plate 130, thereby improving the stripping effect of the upper layer solution and reducing the water content of the solution.

[0021] Further, when the stripping stage ends, the water in the dehydration bin 112 is discharged, and the solution on the bearing plate 131 is discharged. At this time, the dehydration bin 112 is connected to the liquid collecting bin 113 through the water guide pipe 111a, and the liquid guide plate 141 is separated from the stop plate 132. Figure 7 As shown in FIG. 6, as the two stripping plates 130 are separated, a liquid injection channel 112a for receiving the mixed solution from the raw liquid bin 111 is formed between the two stripping plates 130. The raw liquid bin 111 is connected to the dehydration bin 112 through the water guide pipe 111a, and the mixed solution in the raw liquid bin 111 is guided into the dehydration bin 112 through the water guide pipe 111a. The water guide pipe 111a is provided with an electric valve (which is prior art and not shown in the figure). When the water in the dehydration bin 112 is discharged, the electric valve is opened, and the water discharging pipe 104 is closed. The mixed solution in the raw liquid bin 111 is discharged into the dehydration bin 112 through the water guide pipe 111a. During this process, as the mixed solution in the raw liquid bin 111 decreases, the buoyancy of the floating plate 124 decreases, and the downward pressure of the rocker lever 123 on the movable plate 122 decreases. At the same time, the stripping plate 130 is pulled back under the elastic potential energy of the tension spring 130b. When the liquid guide plate 141 is separated from the stop plate 132, the liquid guide plate 141 moves upward under the action of the compression spring 142 and returns to the original position. The liquid guide groove and the liquid discharging groove are again in a deviated state, the two stripping plates 130 are again fitted, and then the above process is repeated.

[0022] It should be noted that before the two stripping plates 130 are fitted, the mixed solution in the raw liquid bin 111 has been completely discharged into the dehydration bin 112, so that the mixed solution in the raw liquid bin 111 is not discharged onto the stripping plate 130 when the two stripping plates 130 are fitted, thereby affecting the dehydration effect.

[0023] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A distillation and dehydration device for the preparation of trimethyl borate, characterized in that: The invention comprises a support plate (100), a distillation tank (101) and a dehydration box (110); an air guide box (102) is connected between the distillation tank (101) and the dehydration box (110); a condensation plate (103) is provided on the inner wall of the air guide box (102); and an end of the air guide box (102) extends into a raw liquid tank (111) formed inside the dehydration box (110); The dehydration box (110) further comprises a liquid collecting bin (113) and a dehydration bin (112) connected to the raw liquid bin (111), wherein the liquid collecting bin (113) is used to collect the upper layer of liquid from the dehydration bin (112); During the liquid storage stage, a pushing mechanism (120) is provided in the dehydration bin (112), and a reciprocating mechanism is provided below the pushing mechanism (120). The reciprocating mechanism includes a stripping plate (130) located in the dehydration bin (112) just below the pushing mechanism (120) and moving laterally, and a supporting plate (131) located in the liquid collecting bin (113) and moving longitudinally. The supporting plate (131) is connected to an air cushion (140) provided at the bottom of the dehydration bin (112). During the stripping stage, the pushing mechanism (120) utilizes buoyancy to drive the stripping plates (130) on both sides to move relative to each other. The stripping plates (130) are responsible for stripping the upper layer solution according to a preset trajectory and transferring it to the liquid collecting bin (113). During the stripping stage, the upper layer solution applies pressure to the supporting plate (131), forcing the air cushion (140) to expand, so that the liquid level of the upper layer solution rises and appears on the stripping path of the stripping plate (130).

2. The rectification and dehydration device for the preparation of trimethyl borate according to claim 1, wherein: The pushing mechanism (120) includes a pushing plate (121) located in the dehydration bin (112). The bottom of the pushing plate (121) is conical and is used to drive the stripping plates (130) on both sides to move relative to the inclined surface of the pushing plate (121). Guide blocks (130a) are fixedly provided on the stripping plates (130) corresponding to the bottom of the pushing plate (121). The guide blocks (130a) on both sides are inclined outward to form an inclination angle for receiving the bottom of the pushing plate (121).

3. The rectification and dehydration device for the preparation of trimethyl borate according to claim 2, wherein: The stripping plate (130) is L-shaped, with its vertical end penetrating the side plate of the dehydration chamber (112), and a tension spring (130b) elastically connected between the vertical end and the side plate, while the other end extends downward into the upper solution to strip the upper solution from the dehydration chamber (112).

4. The rectification and dehydration device for preparing trimethyl borate according to claim 3, wherein: A floating plate (124) is provided in the raw liquid tank (111), and one end of a tilting rod (123) is rotatably provided on the top of the floating plate (124). The other end of the tilting rod (123) is against the vertical rod, and the tilting rod (123) is placed on the side plate and is rotatably connected to the side plate.

5. The rectification and dehydration device for the preparation of trimethyl borate according to claim 2, wherein: A movable plate (122) is fixed between the bottom of the upright pole and the pushing plate (121), and the movable plate (122) is movably arranged in the dehydration bin (112).

6. The distillation and dehydration device for preparing trimethyl borate according to claim 3, wherein: A liquid guide plate (141) is attached to the inner side of the side plate to intercept the upper solution. A compression spring (142) is elastically connected between the bottom of the liquid guide plate (141) and the side plate to support the supporting plate (131). A stop plate (132) is fixed to the stripping plate (130) at the top of the liquid guide plate (141). The end of the stop plate (132) is rounded to allow the liquid guide plate (141) to slide smoothly onto the stop plate (132).

7. The distillation and dehydration device for preparing trimethyl borate according to claim 3, wherein: The liquid guide plate (141) is provided with a plurality of guide grooves, and the side plate is provided with drainage grooves of the same size as the guide grooves. In the initial stage, the guide grooves and the drainage grooves are in a deviated state, and in the stripping stage, the guide grooves and the drainage grooves are in an aligned state.

8. The distillation and dehydration device for preparing trimethyl borate according to claim 3, wherein: A drainage cavity (112b) is formed between the stripping plate (130) and the side plate, wherein the drainage cavity (112b) is used to accommodate the upper layer solution to be stripped by the stripping plate (130); A liquid injection channel (112a) for receiving a mixed solution from the raw liquid bin (111) is formed between the stripping plates (130) on both sides, and a water pipe (111a) for guiding the mixed solution into the dehydration bin (112) is connected between the raw liquid bin (111) and the dehydration bin (112).

9. The distillation and dehydration device for preparing trimethyl borate according to claim 6, wherein: The supporting plate (131) is sleeved with the inner wall of the liquid collecting bin (113), and a drain pipe (105) connected to the liquid collecting bin (113) and a drain pipe (104) connected to the dehydration bin (112) are provided on the side wall of the supporting plate (100).

10. A dehydration method for the distillation dehydration device for preparing trimethyl borate according to claim 4, characterized in that: The method comprises the following steps: S1. When the mixed liquid in the original liquid tank (111) is injected into the dehydration tank (112), an extractant is injected into the dehydration tank (112) and the mixture is allowed to react and stand for a period of time to achieve stratification, i.e., the upper layer is trimethyl borate and the lower layer is water; S2, using the static pressure of the rising liquid level in the original liquid tank (111) as a driving force to drive the push plate (121) downward, the downward movement of the push plate (121) forces the stripping plates (130) on both sides to move relative to each other and separate, and the stripping plates (130) strip the upper layer of solution and transfer it to the liquid collecting tank (113), thereby achieving preliminary stripping; S3, and the carrier plate (131) presses air into the air cushion (140) and forces the air cushion (140) to expand, so that the liquid level of the upper layer solution in the dehydration chamber (112) rises and appears on the stripping path of the stripping plate (130), thereby achieving stripping of the upper layer solution.

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