A device for recovering ethylene glycol butyl ether from waste liquid

Abstract

The application relates to a waste liquid ethylene glycol butyl ether recovery device and relates to the technical field of waste liquid recovery. The device comprises a recovery tank, a hydrophobic microporous membrane is arranged in the recovery tank, the hydrophobic microporous membrane is located at the center position of the recovery tank, the upper portion of the hydrophobic microporous membrane is a condensation chamber, the lower portion of the hydrophobic microporous membrane is a heating chamber, temperature control modules are arranged in the condensation chamber and the heating chamber, a condensation plate is arranged in the condensation chamber, the condensation chamber is connected with a drain pipe, a heating plate is arranged in the heating chamber, and the heating chamber is connected with an input pipe and an output pipe. The application has the effect of recovering ethylene glycol butyl ether in waste liquid for reuse.

Description

Technical Field

[0001] This application relates to the field of waste liquid recycling technology, and in particular to a device for recovering ethylene glycol butyl ether from waste liquid. Background Technology

[0002] Ethylene glycol butyl ether is used as a solvent in the production of coatings and inks. The waste liquid generated when cleaning equipment or changing products contains high concentrations of ethylene glycol butyl ether as well as solid impurities such as pigments and resins. If the waste liquid containing ethylene glycol butyl ether is not properly treated, it will cause environmental pollution. Therefore, in order to achieve resource recycling and improve environmental benefits, this application proposes an ethylene glycol butyl ether recovery device in waste liquid. Utility Model Content

[0003] In order to recover ethylene glycol butyl ether from waste liquid for reuse, this application provides an ethylene glycol butyl ether recovery device from waste liquid.

[0004] The ethylene glycol butyl ether recovery device from waste liquid provided in this application adopts the following technical solution:

[0005] A device for recovering ethylene glycol butyl ether from waste liquid includes a recovery tank. A hydrophobic microporous membrane is disposed inside the recovery tank and is located at the center of the recovery tank. The upper part of the hydrophobic microporous membrane is a condensation chamber, and the lower part of the hydrophobic microporous membrane is a heating chamber. Temperature control modules are disposed in both the condensation chamber and the heating chamber. A condensation plate is disposed in the condensation chamber and is connected to a drain pipe. A heating plate is disposed in the heating chamber and is connected to an input pipe and an output pipe.

[0006] By adopting the above technical solution, the waste liquid is fed into the recovery tank through the input pipe. The temperature difference between the upper and lower sides of the hydrophobic microporous membrane is controlled by the temperature control module, thereby forming a pressure difference. The heating plate heats the waste liquid, and the water in the waste liquid will evaporate. The water vapor will pass through the hydrophobic microporous membrane from the hot side and condense into pure water on the condenser plate. Due to the characteristics of the hydrophobic microporous membrane and the surface tension of liquid water, the liquid water will remain above the hydrophobic microporous membrane and be discharged through the drain pipe, while the waste liquid below is a high-purity ethylene glycol butyl ether solution, thereby realizing the recovery of ethylene glycol butyl ether.

[0007] Preferably, the condensation chamber is also equipped with a vacuum pumping mechanism.

[0008] By adopting the above technical solution, the vacuum pumping mechanism can further reduce the cold side pressure, form a larger pressure difference, increase the flow rate of water vapor, and thus improve the recovery efficiency of ethylene glycol butyl ether.

[0009] Preferably, the recycling tank includes an upper part and a lower part. The inner wall of the lower part opening is provided with an abutment ring, the hydrophobic microporous membrane is disposed on the surface of the abutment ring, the lower top wall is provided with an insertion ring in the circumferential direction, the upper bottom wall is provided with an insertion groove for the insertion ring to abut, and a locking member is provided between the upper part and the lower part.

[0010] By adopting the above technical solution, the recycling tank is divided into upper and lower parts, and an abutment ring is installed in the lower part, which enables the rapid installation or replacement of hydrophobic microporous membranes. This allows for convenient replacement after the micropores of the hydrophobic microporous membrane have been blocked by particulate matter for a long time, thereby improving maintenance efficiency.

[0011] Preferably, the inner wall of the insertion slot is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

[0012] By adopting the above technical solution and setting a sealing ring, the sealing performance between the upper and lower parts can be improved, so as to maintain the pressure difference between the upper and lower sides of the hydrophobic microporous membrane.

[0013] Preferably, the surface of the abutment ring is provided with a plurality of positioning posts, and the bottom wall at the edge of the hydrophobic microporous membrane is provided with positioning holes for the positioning posts to be inserted.

[0014] By adopting the above technical solution, setting up positioning columns can improve the installation stability of hydrophobic microporous membranes.

[0015] Preferably, the output pipe is connected to a settling box, a partition plate is vertically arranged inside the settling box, and a drain valve and a discharge valve are connected to the bottom wall of the settling box. The partition plate is used to separate the drain valve and the discharge valve.

[0016] By adopting the above technical solution, after the water in the wastewater is removed, the wastewater will form a state in which ethylene glycol butyl ether is the main component and other particulate impurities account for a small part. By inputting the wastewater into the settling tank, after settling for a period of time, the waste liquid can be separated into layers. The upper layer is the light phase component with high concentration of ethylene glycol butyl ether, and the lower layer is the heavy phase component of the wastewater. The ethylene glycol butyl ether will overflow through the separator plate and be discharged through the discharge valve, while the remaining wastewater will be collected through the drain valve.

[0017] Preferably, the partition plate includes a fixed plate and a movable plate. The fixed plate is vertically connected to the bottom wall of the stationary box, and the movable plate is nested outside the fixed plate. The top wall of the fixed plate is provided with a lifting member, and the piston rod of the lifting member is arranged in the vertical direction. The lifting member is used to drive the movable plate to slide relative to the fixed plate.

[0018] By adopting the above technical solution and setting the separator plate to be adjustable, the staff can manually discharge the ethylene glycol butyl ether of the upper light phase component of the mixture, thereby effectively improving the collection rate of diethanol butyl ether.

[0019] Preferably, the drain pipe is connected to a water storage tank, the water storage tank is equipped with a flushing pipe, the inner top wall of the settling tank is equipped with a flushing head, the flushing head is located above the drain valve, and the flushing pipe is connected to the flushing head.

[0020] By adopting the above technical solution, the water generated by condensation is used to rinse the settling tank. On the one hand, this can effectively prevent the drain valve from being blocked due to excessive impurities in the settling tank. On the other hand, it makes full use of water resources and reduces overall energy consumption.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. This application enables the recombination of wastewater components through a hydrophobic microporous membrane and a settling tank, thereby achieving the recovery of high-concentration ethylene glycol butyl ether, reducing pollution problems caused by direct wastewater discharge, and improving the utilization rate of ethylene glycol butyl ether.

[0023] 2. The liquid water formed by condensation can be used to rinse the settling tank, thereby effectively reducing energy consumption. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a waste liquid ethylene glycol butyl ether recovery device according to an embodiment of this application.

[0025] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0026] Figure 3 yes Figure 1 A magnified view of a section at point B.

[0027] Explanation of reference numerals in the attached drawings: 1. Recycling tank; 11. Upper part; 111. Insertion groove; 112. Sealing groove; 113. Covering sealing ring; 12. Lower part; 121. Abutment ring; 122. Insertion ring; 123. Positioning column; 13. Condensation chamber; 131. Condensation plate; 132. Drain pipe; 14. Heating chamber; 141. Heating plate; 142. Input pipe; 143. Output pipe; 15. Locking component; 2. Hydrophobic microporous membrane; 21. Positioning hole; 3. Temperature control module; 4. Vacuuming mechanism; 5. Settling box; 51. Drain valve; 52. Discharge valve; 53. Flushing head; 6. Divider plate; 61. Fixing plate; 62. Movable plate; 63. Lifting component; 7. Water storage tank; 71. Flushing pipe. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0029] This application discloses a device for recovering ethylene glycol butyl ether from waste liquid. (Refer to...) Figure 1 and Figure 2 The system includes a recycling tank 1, which comprises an upper part 11 and a lower part 12. A locking element 15 is provided between the upper part 11 and the lower part 12. In this embodiment, the locking element 15 uses bolts and nuts to lock and fix the upper part 11 and the lower part 12. A plug ring 122 is formed on the top wall of the lower part 12 in the circumferential direction. A plug groove 111 for inserting the plug ring 121 is provided on the bottom wall of the upper part 11. A sealing groove 112 is provided on the inner wall of the plug groove 111. A sealing ring 113 is provided in the sealing groove 112 to abut the plug ring 122, thereby improving the sealing between the upper part 11 and the lower part 12.

[0030] Reference Figure 1 The lower part 12 has an opening with a circumferentially oriented abutment ring 121 on its inner wall. A hydrophobic microporous membrane 2 is formed on the surface of the abutment ring 121, and several vertically arranged positioning posts 123 are formed thereon. Positioning holes 21 are provided on the bottom edge of the hydrophobic microporous membrane 2 for inserting the positioning posts 123, thus enabling positioning and rapid installation of the hydrophobic microporous membrane 2. Inside the recovery tank 1, the space above the hydrophobic microporous membrane 2 forms a condensation chamber, which contains a condensation plate 131 and is connected to a drain pipe 132. The space below the hydrophobic microporous membrane 2 forms a heating chamber, which is connected to an input pipe 142 and an output pipe 143. Waste liquid is fed into the heating chamber through the inlet pipe 142. A heating plate 141 is installed in the heating chamber to heat the waste liquid, causing the water in the waste liquid to evaporate and form water vapor. The water vapor passes through the hydrophobic microporous membrane 2 and condenses into liquid water on the condenser plate 131, and is then discharged through the drain pipe 132. Temperature control modules 3 are installed in both the condenser chamber and the heating chamber. In this embodiment, the temperature control module 3 can be a temperature control system, which is implemented by an electric heating element in conjunction with a temperature sensor and a PID controller to form a pressure difference across the hydrophobic microporous membrane 2 by means of temperature difference. A vacuum mechanism 4 is installed in the condenser chamber to further increase the pressure difference and increase the flow rate of water vapor.

[0031] Reference Figure 1 and Figure 3 The discharge pipe is connected to a settling tank 5 for settling the dehydrated waste liquid. The bottom wall of the settling tank 5 is provided with a drain valve 51 and a discharge valve 52. A partition plate 6 is vertically provided inside the settling tank 5 to separate the drain valve 51 and the discharge valve 52. In this embodiment, the partition plate 6 includes a fixed plate 61 and a movable plate 62. The fixed plate 61 is located at the bottom of the settling tank 5, and the movable plate 62 is nested outside the fixed plate 61. A lifting member 63 is provided on the top wall of the fixed plate 61. The piston rod of the lifting member 63 is connected to the movable plate 62 to drive the movable plate 62 to slide relative to the fixed plate 61, thereby facilitating manual control of the overflow of ethylene glycol butyl ether.

[0032] Reference Figure 1The drain pipe 132 is connected to the water storage tank 7, the water storage tank 7 is connected to the flushing pipe 71, and the settling tank 5 is equipped with a flushing head 53. The flushing head 53 is located above the drain valve 51 and is connected to the flushing pipe 71 to flush and clean the settling tank 5 with condensed water.

[0033] The implementation principle of the ethylene glycol butyl ether recovery device in waste liquid according to an embodiment of this application is as follows: Waste liquid is discharged into the heating chamber through the input pipe 142, and the heating plate 141 is activated to heat the waste liquid. The evaporating component in the waste liquid is water. The temperature control module 3 regulates the temperature in the condensing chamber 13 and the heating chamber 14, maintaining the temperature in the condensing chamber 13 at 10-20℃ and the temperature in the heating chamber 14 at 50-80℃. The temperature difference creates a pressure difference, allowing water vapor to pass through the hydrophobic microporous membrane 2 and condense into liquid water on the condensing plate 131. Due to the surface tension of the liquid water, it cannot return to the heating chamber through the hydrophobic microporous membrane 2, and thus it can pass through the drain pipe 132 into the water storage tank 7; the waste liquid is dehydrated. The liquid is discharged through the output pipe 143 and settled in the settling tank 5. The upper light phase is high-concentration ethylene glycol butyl ether, while the lower phase is waste liquid in the form of particulate matter. The lifting device 63 is activated, which drives the movable plate 62 to descend. The ethylene glycol butyl ether at the top will pass over the movable plate 62 and enter the other side of the separator plate 6, and be discharged through the discharge valve 52. The waste liquid at the bottom is discharged through the drain valve 51 for collection and storage. After a certain amount is accumulated, the residual ethylene glycol butyl ether is recovered again. The flushing head 53 can use condensate to flush the settling tank 5 to prevent blockage. This cycle is repeated to efficiently recover ethylene glycol butyl ether from the wastewater while reducing energy consumption.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for recovering ethylene glycol butyl ether from waste liquid, characterized in that: The device includes a recovery tank, inside which a hydrophobic microporous membrane is installed at the center. The upper part of the hydrophobic microporous membrane is a condensation chamber, and the lower part is a heating chamber. Both the condensation chamber and the heating chamber are equipped with temperature control modules. The condensation chamber is equipped with a condensing plate and is connected to a drain pipe. The heating chamber is equipped with a heating plate and is connected to an input pipe and an output pipe.

2. The ethylene glycol butyl ether recovery device for waste liquid according to claim 1, characterized in that: The condensation chamber is also equipped with a vacuum pumping mechanism.

3. The ethylene glycol butyl ether recovery device for waste liquid according to claim 1, characterized in that: The recycling tank includes an upper part and a lower part. An abutment ring is provided on the inner wall of the lower opening. A hydrophobic microporous membrane is disposed on the surface of the abutment ring. An insertion ring is provided on the circumferential direction of the lower top wall. An insertion groove is provided on the upper bottom wall for the insertion ring to abut. A locking element is provided between the upper and lower parts.

4. The ethylene glycol butyl ether recovery device for waste liquid according to claim 3, characterized in that: The inner wall of the insertion slot is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

5. The ethylene glycol butyl ether recovery device for waste liquid according to claim 3, characterized in that: The surface of the abutment ring is provided with a number of positioning posts, and the bottom wall at the edge of the hydrophobic microporous membrane is provided with positioning holes for the positioning posts to be inserted.

6. The ethylene glycol butyl ether recovery device for waste liquid according to claim 1, characterized in that: The output pipe is connected to a settling box, and a partition plate is vertically installed inside the settling box. A drain valve and a discharge valve are connected to the bottom wall of the settling box, and the partition plate is used to separate the drain valve and the discharge valve.

7. The ethylene glycol butyl ether recovery device for waste liquid according to claim 6, characterized in that: The partition plate includes a fixed plate and a movable plate. The fixed plate is vertically connected to the bottom wall of the stationary box, and the movable plate is nested outside the fixed plate. The top wall of the fixed plate is provided with a lifting member. The piston rod of the lifting member is arranged in the vertical direction. The lifting member is used to drive the movable plate to slide relative to the fixed plate.

8. The ethylene glycol butyl ether recovery device for waste liquid according to claim 6, characterized in that: The drain pipe is connected to a water storage tank, and a flushing pipe is installed on the water storage tank. A flushing head is installed on the top wall inside the settling tank. The flushing head is located above the drain valve, and the flushing pipe is connected to the flushing head.

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