A distillation device for PIPP A waste liquid treatment which can guide fractions

Abstract

The present application relates to waste liquid treatment technical field, specifically, it relates to a kind of PIPPA waste liquid treatment with distillation device that can be guided to fraction, including kettle body, with the steam exhaust pipe of kettle body intercommunication, and be used to the refrigerator for the cooling of steam exhaust pipe;The end of the steam exhaust pipe is communicated with flow guide pipe;Flow guide pipe inside movably set with flow sensing mechanism with flow limiting position and flow releasing position, when the liquid inflow in flow guide pipe is greater than liquid discharge, flow sensing mechanism moves from flow limiting position to flow releasing position by liquid gravity.The present application slows down the speed of condensed liquid to outside by slow-flow channel, and a first piston is arranged at the end of the flow guide pipe, which can move downward using condensed liquid generated by simultaneous evaporation of multiple solvents when temperature anomaly occurs, to change the flow path of liquid in the slow-flow channel, so that the condensed water caused by temperature anomaly is guided into the kettle body for redistillation before being discharged to the outside.

Description

Technical Field

[0001] This invention relates to the field of waste liquid treatment technology, and more specifically, to a distillation apparatus for treating PIPPA waste liquid that can guide the distillation of fractions. Background Technology

[0002] Polyisopropenyl phosphonic acid (PIPPA) is a type of polymeric water treatment agent with phosphonic acid groups in its side chains. It has excellent scale inhibition, corrosion inhibition and dispersing abilities, and its performance is particularly outstanding under high temperature and high pressure conditions. It is widely used in industrial water treatment and oilfield development.

[0003] The production process of PIPPA generates PIPPA waste liquid containing acetic acid and xylene. Distillation to recover the acetic acid and xylene from this waste liquid not only meets increasingly stringent environmental emission requirements but also allows these components to be reused in production, significantly reducing raw material costs. This is of great significance for ensuring efficient, safe, and long-term operation of the plant, as well as for energy conservation and environmental protection.

[0004] Currently, this recovery process generally employs staged heating and distillation: first, low-boiling-point solvents are distilled off and condensed at a lower temperature for recovery, then the temperature is increased to distill off high-boiling-point solvents. However, this device lacks structural safety protection measures. If an abnormal increase in heating temperature occurs before all low-boiling-point solvents have been distilled off, the high-boiling-point solvents will boil prematurely, mixing with the remaining low-boiling-point solvent vapors and being condensed and discharged together (this is more pronounced with solvents with similar boiling points; a temperature increase of just a few degrees will cause all solvents to distill off). This not only contaminates the previously collected pure solvents but also requires manual re-distillation of the mixture back into the distillation vessel, impacting production efficiency and increasing operational burden and potential risks. Summary of the Invention

[0005] The purpose of this invention is to provide a distillation apparatus for treating PIPPA waste liquid that can guide the distillation of fractions. The apparatus determines the temperature rise of the vessel by the flow rate of condensate in the steam exhaust pipe. When the temperature rise is abnormal, the condensate is guided back into the vessel by the weight of the condensate, thereby solving the problems mentioned in the background art, namely, the contamination of previously collected pure solvent and the problem of relying on manual pouring of the mixture back into the distillation vessel for re-distillation.

[0006] To achieve the above objectives, a distillation apparatus for treating PIPPA waste liquid that can guide the distillation process includes a vessel body, a steam exhaust pipe connected to the vessel body, and a cooler for cooling the steam exhaust pipe; the end of the steam exhaust pipe is connected to a guide pipe. The flow sensing mechanism with a flow limiting position and a flow discharging position is movably installed inside the flow guide tube. When the liquid inflow in the flow guide tube is greater than the liquid outflow, the flow sensing mechanism moves from the flow limiting position to the flow discharging position by the gravity of the liquid. The end of the guide pipe is connected to a distribution tank. The distribution tank is provided with a slow-flow channel for the liquid in the guide pipe to flow in, and is provided with a drain pipe and a return pipe connected to the slow-flow channel on the outside. The return pipe is connected to the inside of the vessel body. It also includes a drive unit for controlling the connection between the return pipe and the vessel body; Under normal conditions, the passage between the return pipe and the slow flow channel is disconnected. When the flow sensing mechanism is in the discharge position, the driving component controls the slow flow channel to connect with the return pipe, so that the liquid in the slow flow channel flows back to the vessel through the return pipe.

[0007] Based on this, the middle and lower part of the guide tube is provided with multiple drain ports, and the total drain speed of the multiple drain ports is less than the speed at which multiple solvents are simultaneously evaporated, condensed, and then flow into the guide tube. The outer ring of the guide pipe is fitted with a sleeve that communicates with the diversion tank, and the inner diameter of the sleeve is larger than the outer diameter of the guide pipe.

[0008] Based on this, the flow sensing mechanism includes a first piston that is slidably disposed inside the guide tube, and the first piston is disposed on a bracket at the bottom of the guide tube by a support spring; When the support spring is in a free state, the first piston is located below the drain port and in a flow-limiting position; when the first piston is disengaged from the bottom of the guide tube, it is in a discharge position.

[0009] Based on this, the diversion tank is equipped with a partition that divides its interior into a receiving chamber and a returning chamber. The driving component includes a straight rod fixedly mounted at the bottom of the first piston.

[0010] Next, the structure of the slow-flow channel includes the following two types: Structure 1: The diversion tank is horizontally arranged as a whole; multiple lower baffles and upper baffles are staggered on the top of the partition, and a continuous S-shaped channel is formed between the lower baffles and the upper baffles. The S-shaped channel is a slow flow channel. The return pipe is connected to the return chamber, and the top end of the drain pipe passes through the receiving chamber and is connected to the end of the slow flow channel. The top of the partition is provided with a return port, which is located between the beginning and end of the slow flow channel; A valve plate for opening and closing the reflux port is slidably provided at the bottom of the partition. One end of the valve plate is provided with an inclined surface, and the bottom end of the straight rod passes through the partition and extends to the inclined surface.

[0011] Structure 2: The diversion tank is vertically arranged as a whole, and a spiral tube communicating with the liquid receiving chamber is provided at the bottom of the partition. The interior of the spiral tube forms a slow flow channel. The top end of the drain pipe extends into the return liquid chamber to a predetermined height; One end of the return pipe is connected to the piston pipe at the bottom of the diversion tank. A second piston is slidably installed inside the piston pipe. Under normal conditions, the second piston is located at the connection between the piston pipe and the return pipe. The bottom end of the straight rod extends to the top of the second piston.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the distillation apparatus for treating PIPPA waste liquid that can guide the distillation fraction, the speed at which the condensate is discharged to the outside is slowed down by a slow flow channel, and a first piston is set at the end of the guide tube. When the temperature rises abnormally, the condensate generated by the simultaneous evaporation of multiple solvents is moved downward, and the flow path of the liquid in the slow flow channel is changed during the downward movement. This allows the condensate caused by the abnormal temperature rise to be guided into the kettle for redistillation before it is discharged to the outside, thereby avoiding contamination of the previously collected pure solvent. At the same time, there is no need to manually pour the mixture back into the distillation kettle.

[0013] 2. In the distillation device for treating PIPPA waste liquid that can guide the distillation of fractions, the S-shaped channel formed by the lower baffle and the upper baffle can not only slow down the outflow speed of the liquid, but also form a "water seal" to prevent the steam from passing through, so that the steam stays in the liquid receiving chamber and can only be turned into liquid through continuous heat exchange with the outside through the heat conduction plate. Thus, when the refrigeration unit malfunctions, the steam is condensed a second time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the internal structure of the guide tube of the present invention; Figure 3 This is a schematic diagram of the structure of the bracket of the present invention; Figure 4 This is a schematic diagram of the baffle of the present invention; Figure 5 This is a schematic diagram of the valve plate of the present invention; Figure 6 This is a schematic diagram of the working state of the first piston of the present invention; Figure 7 This is a schematic diagram showing the position of the liquid level sensor of the present invention; Figure 8 This is a schematic diagram of the structure of the heat-conducting plate of the present invention; Figure 9 This is a schematic diagram of the spiral tube structure of the present invention; Figure 10 This is a schematic diagram of the working state of the drain pipe of the present invention.

[0015] The meanings of the labels in the diagram are as follows: 100. Kettle body; 101. Steam manifold; 110. Refrigerator; 111. Cold water pipe; 112. Return water pipe; 113. Condenser; 120. Guide pipe; 121. Expansion section; 122. Drain port; 123. First piston; 124. Support; 125. Support spring; 126. Straight rod; 127. Sleeve; 130. Diverter; 131. Baffle; 132. Receiving chamber; 133. Return chamber; 34. Lower baffle; 135. Upper baffle; 136. Slow flow channel; 137. Return port; 138. Perforation; 139. Heat-conducting plate; 140. Drain pipe; 150. Return pipe; 151. Piston tube; 152. Second piston; 160. Valve plate; 161. Inclined surface; 162. Through groove; 163. Slide groove; 164. Connecting spring; 170. Liquid level sensor; 171. Electric push rod; 180. Spiral tube. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] IPPA waste liquid is distilled and reused using a distillation unit, which plays a significant role in energy conservation and environmental protection. Current distillation units, such as... Figure 1As shown, it mainly includes a vessel body 100 and a cooler 110. The cooler 110 is connected to a condenser tank 113 via a cold water pipe 111 and a return water pipe 112. The condenser tank 113 is penetrated by a steam exhaust pipe 101 at the top of the vessel body 100. During cooling, cold water in the cooler 110 enters the cold water pipe 111 and is then pumped into the condenser tank 113 by a water pump. The cold water contacts the steam exhaust pipe 101 in the condenser tank 113 and then flows back to the cooler 110 through the return water pipe 112, thus achieving circulation.

[0020] During distillation, the waste liquid inside the vessel 100 is heated by externally flowing heat transfer oil or other heating methods. The steam generated by the heated waste liquid rises and enters the steam exhaust pipe 101 at the top of the vessel. When the steam flows through the heat exchange section of the steam exhaust pipe 101 (i.e., the part where the steam exhaust pipe 101 penetrates the condenser 113), it is condensed into a liquid state and then discharged through the end of the steam exhaust pipe 101.

[0021] In the above process, by gradually increasing the temperature of the heat transfer oil, solvents with different boiling points in the waste liquid can be distilled off sequentially. To cope with abnormal heating, this invention includes a guide pipe 120, a diversion tank 130, and a driving component, which are used to automatically switch the distillation path and guide the distillate backflow when there is an abnormal temperature rise.

[0022] like Figure 1 As shown, the guide pipe 120 is located at the end of the steam pipe 101, and a flow sensing mechanism is movably installed inside it. The flow sensing mechanism has a flow limiting position and a flow discharging position. When the liquid inflow in the guide pipe 120 is greater than the liquid outflow, the flow sensing mechanism moves from the flow limiting position to the flow discharging position by the gravity of the liquid. The diversion tank 130 is connected to the guide pipe 120. The diversion tank 130 is provided with a slow flow channel 136 for the liquid in the guide pipe 120 to flow in. The diversion tank 130 is provided with a drain pipe 140 and a return pipe 150 connected to the slow flow channel 136. The return pipe 150 is connected to the inside of the vessel body 100. Under normal conditions, the passage between the return pipe 150 and the slow flow channel 136 is disconnected. When the flow sensing mechanism is in the discharge position, the driving component controls the slow flow channel 136 and the return pipe 150 to connect, so that the liquid in the slow flow channel 136 flows back to the vessel body 100 through the return pipe 150.

[0023] Specifically, such as Figure 2As shown, the guide pipe 120 is vertically oriented, with its top end connected to the end of the steam exhaust pipe 101. The lower middle section expands outward to form an expansion section 121. The inner diameter of this expansion section 121 is larger than the inner diameter of the non-expansion section of the guide pipe 120, increasing the force-bearing area of ​​the first piston 123 (described in detail later) and improving the stability of the first piston 123's position switching. Multiple drain ports 122 are provided through the outer wall of the expansion section 121. The total draining speed of these ports is less than the speed at which multiple solvents simultaneously evaporate, condense, and flow into the guide pipe 120. Therefore, when low-boiling-point and high-boiling-point solvents evaporate simultaneously, the amount of condensed liquid increases. Liquid that cannot be discharged from the drain ports 122 immediately accumulates in the expansion section 121. As the liquid accumulates, the gravitational force exerted by the liquid in the expansion section 121 on the flow sensing mechanism increases, forcing the flow sensing mechanism to change position. Finally, the expansion section 121 is connected to the diversion tank 130 through the outer sleeve 127. The inner diameter of the sleeve 127 is larger than the outer diameter of the expansion section 121. This design allows the liquid discharged from the drain port 122 to enter the diversion tank 130.

[0024] Next, the structure of the flow sensing mechanism will be disclosed first. The flow sensing mechanism includes a first piston 123 slidably disposed within the expansion section 121. The outer ring of the first piston 123 fits against the inner ring of the expansion section 121, preventing liquid from flowing out of the expansion section 121 through the gap between them. The bottom of the first piston 123 is connected to a support 124 at the bottom of the expansion section 121 (the structure and shape of the support 124 are shown in the reference). Figure 3 The first piston 123 is elastically connected to the other piston by a support spring 125. The elasticity of the support spring 125 can support the first piston 123 below the drain port 122. When the liquid accumulates, the height of the first piston 123 can be reduced by compression deformation, so that the first piston 123 can switch positions.

[0025] Next, the flow sensing mechanism changes position as follows. When the support spring 125 is in a free state, the first piston 123 is located below the drain port 122 and in a flow-limiting position. In this position, the liquid in the expansion section 121 can only be discharged through the drain port 122. When the low-boiling-point solvent and the high-boiling-point solvent evaporate simultaneously, causing an increase in liquid, the drain port 122 cannot discharge all the liquid in time. Therefore, the liquid accumulates at the top of the first piston 123 and pushes the first piston 123 downward by its own gravity. As the liquid continues to accumulate, the first piston 123 is gradually pushed away from the bottom of the expansion section 121. When the first piston 123 is away from the bottom of the expansion section 121, the first piston 123 is in a discharge position. In the discharge position, the liquid in the expansion section 121 can be discharged through the bottom of the expansion section 121 and the drain port 122.

[0026] like Figure 4As shown, a baffle 131 is provided inside the diversion tank 130, which divides the upper part of the diversion tank 130 into a receiving chamber 132 and the lower part into a return chamber 133. Figures 4-8 In the illustrated embodiment, the diversion tank 130 is horizontally positioned, and the expansion section 121 is connected to the right end of the diversion tank 130 via a sleeve 127. Multiple sets of baffles are equidistantly arranged on the top of the partition 131, with two baffles in each set: a lower baffle 134 and an upper baffle 135. The bottom end of the lower baffle 134 is attached to the top surface of the partition 131, its sides are attached to the inner wall of the receiving chamber 132, and a gap is reserved between its top end and the top of the receiving chamber 132. The top end and sides of the upper baffle 135 are attached to the inner wall of the receiving chamber 132, and a gap is reserved between its bottom end and the top surface of the partition 131. This creates a continuous S-shaped channel between the multiple sets of baffles, which is the slow-flow channel 136. Because the continuous S-shape increases the liquid flow path, the liquid will flow within the diversion tank 130 for a longer time before being discharged, thus avoiding contamination of the collected liquid.

[0027] Therefore, the slow-flow channel 136 can extend the flow path of the liquid. In this way, when the condensate generated by the simultaneous evaporation of multiple solvents enters the slow-flow channel 136, it will take a longer time to be discharged to the outside. This structural design can provide sufficient time for the first piston 123 to move downward.

[0028] In this embodiment, the return pipe 150 connects to the return chamber 133, and the top end of the drain pipe 140 extends into the receiving chamber 132 and connects to the end of the slow-flow channel 136. Thus, when the liquid in the slow-flow channel 136 flows to the end, it can be discharged to the outside and collected through the drain pipe 140. When the liquid in the slow-flow channel 136 contains two solvents with different boiling points, the liquid in the slow-flow channel 136 does not need to be discharged to the outside. Therefore, a return port 137 is provided at the top of the partition 131. The return port 137 is located on the left side where the drain pipe 140 connects to the slow-flow channel 136; in other words, the return port 137 is located between the beginning (the end near the expansion section 121) and the end (the end near the drain pipe 140) of the slow-flow channel 136. In addition, a valve plate 160 is slidably disposed in the groove 163 at the bottom of the partition 131. One end of the valve plate 160 is located below the return port 137 and is used to block the return port 137. A through groove 162 is provided through the surface of the valve plate 160. The other end of the valve plate 160 is provided with an inclined surface 161.

[0029] like Figure 2 As shown, the driving component includes a straight rod 126 fixedly disposed at the bottom of the first piston 123. Figures 4-6 In the embodiment shown, the bottom end of the straight rod 126 passes through the partition 131 and extends to the inclined surface 161.

[0030] The working principle of this embodiment will be described in detail below: like Figure 4 As shown, when the heating temperature is normal, only one solvent in the waste liquid is evaporated and condensed, and the drain port 122 can meet the outflow of liquid under this condition. Therefore, the liquid in the expansion section 121 will flow into the top of the baffle 131 through the drain port 122, and then accumulate at the top of the baffle 131. When the liquid level is greater than the height of the lower baffle 134, the liquid at the top of the baffle 131 begins to flow down... Figure 4 The liquid flows in the direction of the dashed arrow and eventually flows to the outside through the drain pipe 140.

[0031] like Figure 6 As shown, when the heating temperature is abnormal, multiple solvents in the waste liquid are evaporated and condensed simultaneously, resulting in an increase in condensate. However, the drain port 122 cannot discharge the condensate in time. During this process, the liquid discharged through the drain port 122 will flow in the slow flow channel 136. Since the slow flow channel 136 has a long route, this part of the liquid will not be discharged immediately. At the same time, some liquid will accumulate on the top of the first piston 123. As the liquid increases, the first piston 123 is forced to move downward and drives the straight rod 126 to move downward. The downward movement of the straight rod 126 presses the valve plate 160 through the inclined surface 161, causing the through groove 162 to move below the return port 137. At this time, the return port 137 is opened. When the liquid in the slow flow channel 136 flows through the return port 137, it will flow into the return chamber 133 through the return port 137, and then return to the vessel body 100 through the return pipe 150 (the liquid at the return pipe 150 can be pumped into the vessel body 100 by a water pump).

[0032] It should be noted that a connecting spring 164 can be installed between the valve plate 160 and the slide groove 163. The moving valve plate 160 can be reset by the connecting spring 164. If the connecting spring 164 is not installed, the valve plate 160 is reset manually.

[0033] exist Figure 7 In the illustrated embodiment, the driving component can also be a combination of a liquid level sensor 170 and an electric actuator 171. The liquid level sensor 170 is disposed on the side wall of the expansion section 121, and the electric actuator 171 is mounted on the outer wall of the diversion tank 130, with its movable end fixedly connected to the valve plate 160. Thus, when the liquid volume at the top of the first piston 123 reaches the liquid level sensor 170, the liquid level sensor 170 senses the presence of liquid and sends a control signal to actuate the electric actuator 171, causing the valve plate 160 to move and thus opening the return port 137.

[0034] To facilitate the drainage of liquid within the slow-flow channel 136, such as Figure 5As shown, except for the last lower baffle 134 (i.e., the rightmost lower baffle 134), the bottom of the remaining lower baffles 134 are provided with perforations 138, which allow the bottom of the slow-flow channel 136 to be connected. Thus, when the liquid no longer flows into the distribution tank 130, the residual liquid in the slow-flow channel 136 can flow through the perforations 138 to the return port 137, at which point the return port 137 can be opened to discharge it. Furthermore, the diameter of the perforations 138 is between 2-5 mm to avoid excessively large perforations affecting the flow rate of the liquid in the slow-flow channel 136.

[0035] exist Figure 9 and Figure 10 In the illustrated embodiment, another structure of the slow-flow channel 136 is disclosed. As shown, the distribution tank 130 is vertically arranged, and a spiral tube 180 communicating with the receiving chamber 132 is provided at the bottom of the partition 131. The slow-flow channel 136 is formed inside the spiral tube 180. Next, the top end of the drain pipe 140 is inserted into the return chamber 133, so that the height of the top end of the drain pipe 140 is higher than the height of the bottom surface of the return chamber 133, while one end of the return pipe 150 is connected to the bottom of the distribution tank 130 through the piston tube 151. Specifically, the piston tube 151 is vertically arranged and perpendicular to the return pipe 150. The bottom end of the piston tube 151 is connected to the bottom of the diversion tank 130, and the return pipe 150 is connected to the middle of the piston tube 151. A second piston 152 is slidably arranged inside the piston tube 151. Under normal conditions, the second piston 152 is located at the connection between the piston tube 151 and the return pipe 150, and the bottom end of the straight rod 126 extends to the top of the second piston 152.

[0036] The working principle of this embodiment is basically the same as that of the above embodiments, except that: refer to Figure 9 When the temperature is normal, the liquid flows into the receiving chamber 132 through the drain port 122, and then flows slowly in the spiral tube 180. When the liquid flows from the bottom of the spiral tube 180 to the bottom of the return chamber 133, the liquid first accumulates at the bottom of the return chamber 133. After the liquid level is higher than the top of the drain pipe 140, the liquid is discharged to the outside through the drain pipe 140.

[0037] refer to Figure 10 When the temperature is abnormal, the liquid in the expansion section 121 increases, and the first piston 123 is pressed down. At this time, the first piston 123 drives the straight rod 126 to press the second piston 152 down, so that the second piston 152 is disengaged from the connection between the return pipe 150 and the piston tube 151. At this time, the liquid at the bottom of the return chamber 133 will flow back into the vessel body 100 through the return pipe 150. Since the liquid level at the bottom of the return chamber 133 can be discharged through the return pipe 150, the liquid level height cannot be higher than the top height of the drain pipe 140. At this time, the liquid will not be discharged from the drain pipe 140.

[0038] Furthermore, considering that continuous operation of the refrigeration unit 110 or abnormal temperature control can cause fluctuations in the chilled water temperature, this phenomenon can result in some steam not being condensed. Therefore, refer to... Figure 8 Furthermore, the present invention also provides a heat-conducting plate 139 on the side wall of the distribution tank 130 corresponding to the liquid receiving chamber 132. The heat-conducting plate 139 is made of aluminum or copper. In this way, when the cooler 110 does not condense all the steam in the steam discharge pipe 101 during operation, the steam will enter the liquid receiving chamber 132 through the liquid discharge port 122. At this time, because the lower baffle 134 and the upper baffle 135 block the steam from passing through, the steam can only stay above the liquid receiving chamber 132 and come into contact with the heat-conducting plate 139. At this time, the heat-conducting plate 139 exchanges heat with the steam through the external temperature, thereby performing secondary condensation.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A distillation apparatus for treating PIPPA waste liquid with fraction guidance, comprising a vessel body (100), a steam exhaust pipe (101) communicating with the vessel body (100), and a cooler (110) for cooling the steam exhaust pipe (101); characterized in that, The end of the steam pipe (101) is connected to a guide pipe (120). The guide pipe (120) is equipped with a flow sensing mechanism with a flow limiting position and a flow discharging position. When the liquid inflow in the guide pipe (120) is greater than the liquid outflow, the flow sensing mechanism moves from the flow limiting position to the flow discharging position by the gravity of the liquid. The end of the guide pipe (120) is connected to a distribution tank (130). The distribution tank (130) is provided with a slow flow channel (136) for the liquid in the guide pipe (120) to flow in. The outside is provided with a drain pipe (140) and a return pipe (150) connected to the slow flow channel (136). The return pipe (150) is connected to the inside of the vessel body (100). It also includes a drive unit for controlling the connection state between the return pipe (150) and the vessel body (100); Under normal conditions, the passage between the return pipe (150) and the slow flow channel (136) is disconnected. When the flow sensing mechanism is in the discharge position, the driving component controls the slow flow channel (136) to connect with the return pipe (150), so that the liquid in the slow flow channel (136) flows back to the vessel body (100) through the return pipe (150). The diversion tank (130) is provided with a partition (131) that divides its interior into a receiving chamber (132) and a return chamber (133). The diversion tank (130) is horizontally arranged; the top of the partition (131) is provided with multiple lower baffles (134) and upper baffles (135) staggered, and a continuous S-shaped channel is formed between the lower baffles (134) and the upper baffles (135), which is a slow flow channel (136). The return pipe (150) is connected to the return chamber (133), and the top end of the drain pipe (140) is inserted into the receiving chamber (132) and connected to the end of the slow flow channel (136). The top of the partition (131) is provided with a return port (137), which is located between the beginning and end of the slow flow channel (136); The bottom of the partition (131) is slidably provided with a valve plate (160) for opening and closing the return port (137).

2. The distillation apparatus for treating PIPPA waste liquid with fraction guidance according to claim 1, characterized in that, The middle and lower part of the guide tube (120) is provided with multiple drain ports (122), and the total draining speed of the multiple drain ports (122) is less than the speed at which multiple solvents are simultaneously evaporated, condensed and flow into the guide tube (120); The outer ring of the guide pipe (120) is fitted with a sleeve (127) that communicates with the diversion tank (130), and the inner diameter of the sleeve (127) is larger than the outer diameter of the guide pipe (120).

3. The distillation apparatus for treating PIPPA waste liquid with fraction guidance according to claim 2, characterized in that, The flow sensing mechanism includes a first piston (123) slidably disposed in the guide tube (120), and the first piston (123) is disposed on a bracket (124) at the bottom of the guide tube (120) by a support spring (125); When the support spring (125) is in a free state, the first piston (123) is located below the drain port (122) and is in a flow-limiting position; when the first piston (123) is disengaged from the bottom of the guide tube (120), it is in a discharge position.

4. The distillation apparatus for treating PIPPA waste liquid with fraction guidance according to claim 3, characterized in that, The lower middle part of the guide tube (120) expands outward to form an expansion section (121), and the first piston (123) is movably disposed in the expansion section (121), thereby increasing the pressure of the first piston (123) through the expansion section (121).

5. The distillation apparatus for treating PIPPA waste liquid with fractional guidance according to claim 3, characterized in that, The drive component includes a straight rod (126) fixedly disposed at the bottom of the first piston (123).

6. The distillation apparatus for treating PIPPA waste liquid with fractional guidance according to claim 5, characterized in that, One end of the valve plate (160) is provided with a slope (161), and the bottom end of the straight rod (126) passes through the partition plate (131) and extends to the slope (161).

7. The distillation apparatus for treating PIPPA waste liquid with fraction guidance according to claim 6, characterized in that, Except for the lower baffle (134) located at the end of the slow flow channel (136), the bottom of the other lower baffles (134) are provided with perforations (138).

8. The distillation apparatus for treating PIPPA waste liquid with fraction guidance according to claim 5, characterized in that, The diversion tank (130) is replaced with a vertically arranged one; The slow-flow channel (136) is replaced by a spiral tube (180), which is located at the bottom of the partition (131) and communicates with the liquid receiving chamber (132); The top end of the drain pipe (140) is inserted into the return chamber (133) to a predetermined height; One end of the return pipe (150) is connected to the piston pipe (151) at the bottom of the diversion tank (130). A second piston (152) is slidably disposed inside the piston pipe (151). Under normal conditions, the second piston (152) is located at the connection between the piston pipe (151) and the return pipe (150). The bottom end of the straight rod (126) extends to the top of the second piston (152).

9. The distillation apparatus for treating PIPPA waste liquid with fractional guidance according to claim 6, characterized in that, A heat-conducting plate (139) is provided on the side wall of the diversion tank (130) at the location corresponding to the liquid receiving chamber (132). The heat-conducting plate (139) is used to perform secondary condensation on the steam that cannot pass through the slow flow channel (136).

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