Tail gas treatment device for reduced pressure distillation of UV hot-melt pressure-sensitive adhesive

Abstract

The utility model provides a tail gas treatment device for reduced pressure distillation of a UV (ultraviolet) hot-melt pressure-sensitive adhesive. The tail gas treatment device comprises a buffer bottle, a first absorption bottle, a first indication absorption bottle, a second absorption bottle, a second indication absorption bottle and a reversing three-way valve, the buffer bottle avoids backflow, the double-gas-path design is switched through a reversing three-way valve, the tail end of each gas path is provided with an acid-base color-changing indicating liquid for monitoring the saturation state of the absorption liquid, the color is changed during saturation to prompt replacement, and excessive dissipation of ethyl acetate is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment devices, in particular to a tail gas treatment device used for the reduced pressure distillation of UV hot melt pressure sensitive adhesives. Background Art

[0002] UV hot melt pressure-sensitive adhesive (HMPA) is a hot melt adhesive material that cures under UV light and is widely used in various bonding applications. In a laboratory setting, to prepare samples of UV HMPA, a vacuum distillation method is typically used, and the exhaust gas generated during this process must be discharged through the exhaust port at the top of the condenser.

[0003] Currently, to treat the exhaust gas generated in this process, most laboratories use a traditional absorption bottle system, which contains a specific absorption liquid (such as ethanol) to capture and absorb harmful organic compounds that may be present in the exhaust gas, such as ethyl acetate, to prevent these substances from being released into the air and polluting the experimental environment.

[0004] Although the above methods can meet the basic needs of tail gas treatment to a certain extent, there are still obvious shortcomings:

[0005] First, when the absorption liquid absorbs a sufficient amount of ethyl acetate, it will reach a saturated state. If the absorption liquid is not replaced in time, the unabsorbed ethyl acetate may escape into the laboratory environment, posing a threat to the environment and personnel health.

[0006] Secondly, most existing exhaust gas treatment devices use a single absorption bottle design, which means that once the absorption liquid is saturated, it will no longer be able to effectively treat the subsequent exhaust gas generated. Immediately replacing the new absorption bottle will increase the risk of experimental interruption.

[0007] Furthermore, the preparation of UV hot-melt pressure-sensitive adhesive samples often involves a heating step. When the sample cools down after the experiment, the temperature change may cause a pressure change inside the absorption bottle, which in turn causes the absorption liquid to flow back into the condenser and contaminate the sample.

[0008] At the same time, existing exhaust gas treatment equipment fails to provide sufficient information feedback to operators, such as the experimental gas production progress, which makes it difficult for experimenters to accurately grasp the status of the entire treatment process. They can only rely on observing bubbles in the absorption liquid to roughly estimate the progress.

[0009] In view of this, the inventors specially designed an exhaust gas treatment device for the reduced-pressure distillation of UV hot-melt pressure-sensitive adhesives, which led to the present case. Utility Model Content

[0010] In order to solve the above problems, the technical solution of the present utility model is as follows:

[0011] A tail gas treatment device for reduced pressure distillation of UV hot melt pressure-sensitive adhesive, comprising:

[0012] A buffer bottle, the bottle mouth of which has a first air inlet pipe and a first air outlet pipe extending into the bottle, wherein the first air inlet pipe is connected to the exhaust port of the condenser;

[0013] A first absorption bottle, wherein the absorption liquid is provided in the bottle, and the bottle mouth has a second air inlet pipe and a second air outlet pipe extending into the bottle and located below and above the liquid level of the absorption liquid respectively;

[0014] A first indicator absorption bottle, wherein the bottle is provided with an acid-base color-changing indicator liquid, and the bottle mouth has a third air inlet pipe and a third air outlet pipe extending into the bottle and located below and above the liquid level of the acid-base color-changing indicator liquid, respectively, and the third air inlet pipe is connected to the second air outlet pipe;

[0015] A second absorption bottle, wherein the absorption liquid is provided in the bottle, and the bottle mouth has a fourth air inlet pipe and a fourth air outlet pipe extending into the bottle and located below and above the liquid level of the absorption liquid respectively;

[0016] A second indicator absorption bottle, wherein the bottle is provided with an acid-base color-changing indicator liquid, and the bottle mouth has a fifth air inlet pipe and a fifth air outlet pipe extending into the bottle and located below and above the liquid level of the acid-base color-changing indicator liquid, respectively, and the fifth air inlet pipe is connected to the fourth air outlet pipe;

[0017] The reversing three-way valve comprises a control valve core, an air inlet end, a first air outlet end and a second air outlet end, wherein the first air outlet end is connected to the second air inlet pipe, and the second air outlet end is connected to the fourth air inlet pipe.

[0018] Preferably, the first air outlet pipe and the first air inlet end, the first air outlet end and the second air inlet pipe, the second air outlet pipe and the third air inlet pipe, the second air outlet end and the fourth air inlet pipe, and the fourth air outlet pipe and the fifth air inlet pipe are all connected through an air guide hose.

[0019] Preferably, the reversing three-way valve includes a main body, a control valve core, an air inlet end, a first air outlet end and a second air outlet end, and the control valve core has a switchable passage connecting the air inlet end and the first air outlet end or connecting the air inlet end and the second air outlet end.

[0020] Preferably, the absorption liquid is an ethanol liquid layer.

[0021] Preferably, a first control valve is provided between the second air outlet pipe and the third air inlet pipe, and a second control valve is provided between the fourth air outlet pipe and the fifth air inlet pipe.

[0022] Preferably, it also includes an air pressure indicator and an alarm device;

[0023] The air pressure indicator is connected between the first air inlet pipe and the exhaust port of the condenser and is used to expand or contract with the air pressure in the pipe;

[0024] The alarm device is arranged on one side of the air pressure indicator, and has a connection state in contact with the air pressure indicator and a separation state separated from the air pressure indicator, and is used to alarm in the separation state.

[0025] Preferably, an air intake tee is provided between the first air intake pipe and the exhaust port of the condenser, wherein two ends of the air intake tee are connected to the first air intake pipe and the exhaust port of the condenser, and the other third end thereof protrudes to form a connecting section.

[0026] Preferably, the air pressure indicator is a balloon, and the ball mouth of the balloon is sealed and connected to the connecting section through a tightening device so that the interior of the balloon is connected to the air inlet three-way pipe.

[0027] Preferably, a supporting structure is further included, wherein the supporting structure includes a hook section that can be hooked on either end of the air intake tee, a fixed section extending downward along the lower end of the two hook sections, and an overlapping section connected between the bottoms of the two fixed sections and distributed in an arc shape. The air pressure indicator is arranged above the overlapping section, and the alarm device is arranged on the overlapping section and includes a push switch for contacting the expanded air pressure indicator, a control module electrically connected to the push switch in a normally open state, and a sound alarm module and a light flashing module electrically connected to the control module. After the air pressure indicator expands and contacts the push switch, the push switch is connected to the closed circuit of the control module.

[0028] Preferably, the tightening device is a memory wire.

[0029] The beneficial effects of the utility model are as follows:

[0030] This utility model prevents backflow by providing a buffer bottle. It also employs a dual gas circuit design and uses a reversing three-way valve to switch gas circuits. Each gas circuit is terminated with an acid-base color-changing indicator liquid to indicate the saturation state of the absorption liquid. When the absorption liquid in a particular gas circuit reaches saturation, the escaping ethyl acetate enters the acid-base color-changing indicator liquid, where it hydrolyzes to produce acetic acid, changing the pH of the solution and triggering a color change condition. This color change prompts the operator to replace the saturated absorption liquid, thus preventing excessive ethyl acetate from escaping and interrupting the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0032] in:

[0033] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0034] Figure 2This is a block diagram of the connection principle of the utility model;

[0035] Figure 3 This is a block diagram showing the connection principle of the air pressure indicator in the present utility model;

[0036] Figure 4 This is a schematic diagram of a partially exploded structure highlighting the air pressure indicator in the present invention;

[0037] Figure 5 This is a schematic diagram of the partial explosion structure of the highlight alarm device in the utility model;

[0038] Figure 6 This is a block diagram highlighting the connection principle of the alarm device in the utility model.

[0039] Description of labels:

[0040] 10. Buffer bottle; 11. First air inlet pipe; 12. First air outlet pipe; 20. First absorption bottle; 21. Second air inlet pipe; 22. Second air outlet pipe; 30. Absorption liquid; 31. Acid-base color-changing indicator liquid; 40. First indicator absorption bottle; 41. Third air inlet pipe; 42. Third air outlet pipe; 50. Second absorption bottle; 51. Fourth air inlet pipe; 52. Fourth air outlet pipe; 60. Second indicator absorption bottle; 61. Fifth air inlet pipe; 62. Fifth air outlet pipe; 70. Reversing three-way valve; 71. Main body; 72. Control valve core; 7 3. Air inlet end; 74. First air outlet end; 75. Second air outlet end; 80. Air guide hose; 90. First control valve; 91. Second control valve; 100. Air pressure indicator; 101. Air inlet tee; 102. Connecting section; 103. Tightening device; 110. Alarm device; 111. Press switch; 112. Control module; 113. Sound alarm module; 114. Flashing light module; 120. Support structure; 121. Hook section; 122. Fixing section; 123. Overlap section; 130. Third control valve. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] See also Figures 1 to 6 , which is a tail gas treatment device for the vacuum distillation of UV hot melt pressure sensitive adhesive as the best embodiment of the utility model, comprising:

[0043] The buffer bottle 10 has a first air inlet pipe 11 and a first air outlet pipe 12 extending into the bottle. The first air inlet pipe 11 is connected to the exhaust port of the condenser. In this embodiment, the inner portion of the first air inlet pipe 11 extends to a higher position below the bottle mouth, and the inner portion of the first air outlet pipe 12 extends to the bottom of the bottle, thereby achieving a better anti-backflow effect.

[0044] A first absorption bottle 20, wherein an absorption liquid 30 is provided in the bottle, and a second air inlet pipe 21 and a second air outlet pipe 22 are provided at the bottle mouth, extending into the bottle and being located below and above the liquid level of the absorption liquid 30, respectively;

[0045] A first indicator absorption bottle 40 is provided with an acid-base color-changing indicator liquid 31, and a third air inlet pipe 41 and a third air outlet pipe 42 extending into the bottle and positioned below and above the liquid level of the acid-base color-changing indicator liquid 31, respectively. The third air inlet pipe 41 is connected to the second air outlet pipe 22;

[0046] A second absorption bottle 50 has an absorption liquid 30 therein and a fourth air inlet pipe 51 and a fourth air outlet pipe 52 extending into the bottle and positioned below and above the liquid level of the absorption liquid 30, respectively;

[0047] A second indicator absorption bottle 60 is provided with an acid-base color-changing indicator liquid 31, and a bottle mouth has a fifth air inlet pipe 61 and a fifth air outlet pipe 62 extending into the bottle and located below and above the liquid level of the acid-base color-changing indicator liquid 31, respectively. The fifth air inlet pipe 61 is connected to the fourth air outlet pipe 52;

[0048] The reversing three-way valve 70 has a control valve core 72 , an air inlet end 73 , a first air outlet end 74 and a second air outlet end 75 . The first air outlet end 74 is connected to the second air inlet pipe 21 , and the second air outlet end 75 is connected to the fourth air inlet pipe 51 .

[0049] Preferably, the first air outlet pipe 12 and the first air inlet end 73, the first air outlet end 74 and the second air inlet pipe 21, the second air outlet pipe 22 and the third air inlet pipe 41, the second air outlet end 75 and the fourth air inlet pipe 51, and the fourth air outlet pipe 52 and the fifth air inlet pipe 61 are all connected through an air guide hose 80.

[0050] Thus, the various components are connected through the air guide hose 80, which increases the flexibility and operability of the system and facilitates installation and maintenance by experimenters.

[0051] Preferably, the reversing three-way valve 70 includes a main body 71, a control valve core 72, an air inlet end 73, a first air outlet end 74 and a second air outlet end 75. The control valve core 72 has a switchable passage (not shown in the figure) connecting the air inlet end 73 and the first air outlet end 74 or connecting the air inlet end 73 and the second air outlet end 75.

[0052] Therefore, the three-way reversing valve 70 can ensure the reliability and accuracy of gas path switching, thereby improving the overall performance of the system.

[0053] Preferably, the absorption liquid 30 is an ethanol liquid layer.

[0054] Choosing ethanol as the absorption liquid 30 can absorb most of the ethyl acetate in the tail gas, ensuring the effect of tail gas treatment.

[0055] Preferably, a first control valve 90 is provided between the second air outlet pipe 22 and the third air inlet pipe 41 , and a second control valve 91 is provided between the fourth air outlet pipe 52 and the fifth air inlet pipe 61 .

[0056] Thus, by setting the first control and second control valves 91, the connection between the second outlet pipe 22 and the third inlet pipe 41 and between the fourth outlet pipe 52 and the fifth inlet pipe 61 can be cut off, so that when the user finds that the absorption liquid 30 is saturated, the exhaust gas discharge can be cut off and the reversing three-way valve 70 can be switched at the same time, thereby further avoiding excessive escape of ethyl acetate.

[0057] Preferably, it also includes an air pressure indicator 100 and an alarm device 110;

[0058] The air pressure indicator 100 is connected between the first air inlet pipe 11 and the exhaust port of the condenser, and is used to expand or contract with the air pressure in the pipe;

[0059] The alarm device 110 is provided on one side of the air pressure indicator 100 and has a connection state in contact with the air pressure indicator 100 and a separation state in which the alarm device 110 is separated from the air pressure indicator 100 , and is used for sounding an alarm in the separation state.

[0060] The air pressure indicator 100 (such as a balloon) and the alarm device 110 are used to monitor the air pressure changes in the system in real time. Once the air pressure is abnormal, an alarm is immediately issued to remind the operator that the experiment has reached a certain stage and subsequent intervention is required, thereby fully enhancing the safety and reliability of the system.

[0061] Preferably, an air intake tee 101 is provided between the first air intake pipe 11 and the exhaust port of the condenser, wherein two ends of the air intake tee 101 are connected to the first air intake pipe 11 and the exhaust port of the condenser, and the other third end thereof protrudes to form a connecting section 102, and the air pressure indicator 100 is a balloon, and the ball mouth of the balloon is sealed and connected to the connecting section 102 by a tightening device 103 so that the interior of the balloon is connected to the air intake tee 101.

[0062] Thus, through the balloon connected to the connecting section 102, the pressure change in the gas circuit can be fed back in real time. During the experimental stage, ethyl acetate is discharged faster. At this time, the pressure in the gas circuit causes the balloon to expand, triggering the alarm device 110 to connect it with the balloon. At this time, the alarm device 110 does not work; when the experiment enters the later stage, the ethyl acetate output decreases, the pressure in the gas circuit drops, the balloon shrinks, and separates from the alarm device 110, triggering the alarm device 110, prompting the operator that the experiment has entered the later stage and to pay attention to relevant operations.

[0063] Preferably, a support structure 120 is further included, and the support structure 120 includes a hook section 121 that can be hooked on two ends of the air intake tee pipe 101, a fixed section 122 extending downward along the lower ends of the two hook sections 121, and an overlapping section 123 connected between the bottoms of the two fixed sections 122 and distributed in an arc shape. The air pressure indicator 100 is arranged above the overlapping section 123, and the alarm device 110 is arranged on the overlapping section 123 and includes a press switch 111 for contacting the expanded air pressure indicator 100, a control module 112 that is normally electrically connected to the press switch 111, and a sound alarm module 113 and a light flashing module 114 that are electrically connected to the control module 112. After the air pressure indicator 100 expands and contacts the press switch 111, the circuit of the press switch 111 and the control module 112 is closed. In this embodiment, the control module 112 is an MCU microprocessor.

[0064] The alarm device 110 is fixed by the support structure 120, ensuring the stability and reliability between the air pressure indicator 100 and the alarm device 110, and avoiding false alarms caused by external factors. During the experimental stage, ethyl acetate is discharged quickly. At this time, the pressure in the air circuit causes the balloon to expand, triggering the push switch 111 on the alarm device 110, so that the control module 112 and the push switch 111 are in a normally open state, and the alarm device 110 does not work at this time; when the experiment enters the later stage, the ethyl acetate output decreases, the pressure in the air circuit drops, the balloon shrinks, and separates from the push switch 111 of the alarm device 110. The control module 112 and the push switch 111 are in a closed state, triggering the alarm device 110 to work, causing the sound alarm module 113 to sound an alarm and the light flashing module 114 to flash, prompting the operator to pay attention to the relevant operations when the experiment enters the later stage.

[0065] Preferably, the tightening device 103 is a memory metal wire, which in this embodiment is an iron wire with a rubber coating on the outside.

[0066] In addition, in this embodiment, all the air inlet pipes, air outlet pipes, absorption bottles, buffer bottles 10 and indicator absorption bottles are made of quartz material, and the air guide hose 80 is a PFA hose or a polytetrafluoroethylene hose. By inserting the quartz material tube mouth into the tube mouth of the air guide hose 80, convenient connection of each part is achieved, and it is easy to combine, and various forms of connection can be achieved.

[0067] In this embodiment, the acid-base color-changing indicator liquid 31 is a phenolphthalein solution or other indicators that can react with acetic acid to change color.

[0068] In addition, a third control valve 130 for controlling the air intake of the entire exhaust gas treatment device is provided between the intake tee pipe 101 and the first intake pipe 11 .

[0069] The beneficial effects of the utility model are as follows:

[0070] The present invention prevents backflow by providing a buffer bottle 10. It also employs a dual gas circuit design and implements gas circuit switching via a reversing three-way valve 70. Each gas circuit is terminated with an acid-base color-changing indicator liquid 31, which indicates the saturation state of the absorption liquid 30. When the absorption liquid 30 in a particular gas circuit reaches saturation, the escaping ethyl acetate enters the acid-base color-changing indicator liquid 31, where it hydrolyzes to produce acetic acid, changing the pH of the solution and triggering a color change condition, prompting the operator to replace the saturated absorption liquid 30. This prevents excessive ethyl acetate from escaping and interrupting the experiment.

[0071] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A tail gas treatment device for vacuum distillation of UV hot melt pressure sensitive adhesive, characterized in that: include: A buffer bottle (10) having a first air inlet pipe (11) and a first air outlet pipe (12) extending into the bottle, wherein the first air inlet pipe (11) is connected to the exhaust port of the condenser; A first absorption bottle (20) is provided with an absorption liquid (30) therein, and the bottle mouth has a second air inlet pipe (21) and a second air outlet pipe (22) extending into the bottle and located below and above the liquid level of the absorption liquid (30) respectively; A first indicating absorption bottle (40) is provided with an acid-base color-changing indicating liquid (31) in the bottle, and the bottle mouth has a third air inlet pipe (41) and a third air outlet pipe (42) extending into the bottle and located below and above the liquid level of the acid-base color-changing indicating liquid (31) respectively, and the third air inlet pipe (41) is connected to the second air outlet pipe (22); A second absorption bottle (50) is provided with an absorption liquid (30) therein, and the bottle mouth has a fourth air inlet pipe (51) and a fourth air outlet pipe (52) extending into the bottle and located below and above the liquid level of the absorption liquid (30) respectively; A second indicating absorption bottle (60) is provided with an acid-base color-changing indicating liquid (31) in the bottle, and the bottle mouth has a fifth air inlet pipe (61) and a fifth air outlet pipe (62) extending into the bottle and located below and above the liquid level of the acid-base color-changing indicating liquid (31) respectively, and the fifth air inlet pipe (61) is connected to the fourth air outlet pipe (52); The reversing three-way valve (70) comprises a control valve core (72), an air inlet end (73), a first air outlet end (74), and a second air outlet end (75), wherein the first air outlet end (74) is connected to the second air inlet pipe (21), and the second air outlet end (75) is connected to the fourth air inlet pipe (51).

2. The tail gas treatment device for the reduced pressure distillation of UV hot melt pressure sensitive adhesive according to claim 1, characterized in that: The first air outlet pipe (12) and the first air inlet end (73), the first air outlet end (74) and the second air inlet pipe (21), the second air outlet pipe (22) and the third air inlet pipe (41), the second air outlet end (75) and the fourth air inlet pipe (51), and the fourth air outlet pipe (52) and the fifth air inlet pipe (61) are all connected via an air guide hose (80).

3. The tail gas treatment device for the vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 1, characterized in that: The reversing three-way valve (70) comprises a main body (71), a control valve core (72), an air inlet end (73), a first air outlet end (74) and a second air outlet end (75); the control valve core (72) has a switchable passage connecting the air inlet end (73) and the first air outlet end (74) or connecting the air inlet end (73) and the second air outlet end (75).

4. The tail gas treatment device for the vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 1, characterized in that: The absorption liquid (30) is an ethanol liquid layer.

5. The tail gas treatment device for the vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 1, characterized in that: A first control valve (90) is provided between the second air outlet pipe (22) and the third air inlet pipe (41), and a second control valve (91) is provided between the fourth air outlet pipe (52) and the fifth air inlet pipe (61).

6. The tail gas treatment device for vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 1, characterized in that: It also includes an air pressure indicator (100) and an alarm device (110); The air pressure indicator (100) is connected between the first air inlet pipe (11) and the exhaust port of the condenser, and is used to expand or contract with the air pressure in the pipe; The alarm device (110) is provided on one side of the air pressure indicator (100), has a connection state in contact with the air pressure indicator (100) and a separation state in which the alarm device is separated from the air pressure indicator (100), and is used to generate an alarm in the separation state.

7. The tail gas treatment device for the reduced pressure distillation of UV hot melt pressure sensitive adhesive according to claim 6, characterized in that: An air intake tee (101) is provided between the first air intake pipe (11) and the exhaust port of the condenser, wherein two ends of the air intake tee (101) are connected to the first air intake pipe (11) and the exhaust port of the condenser, and the other third end thereof protrudes to form a connecting section (102).

8. The tail gas treatment device for the vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 7, characterized in that: The air pressure indicator (100) is a balloon, and the ball opening of the balloon is sealed and connected to the connecting section (102) via a tightening device (103) so that the interior of the balloon is connected to the air inlet three-way pipe (101).

9. The tail gas treatment device for the reduced pressure distillation of UV hot melt pressure sensitive adhesive according to claim 8, characterized in that: The air pressure indicator (100) is provided above the overlapping section (123), and the alarm device (110) is provided on the overlapping section (123). 23) and includes a push switch (111) for contacting the inflated air pressure indicator (100), a control module (112) electrically connected to the push switch (111) in a normally open state, and a sound alarm module (113) and a light flashing module (114) electrically connected to the control module (112); after the air pressure indicator (100) expands and contacts the push switch (111), the circuit of the push switch (111) and the control module (112) is closed.

10. The tail gas treatment device for vacuum distillation of UV hot melt pressure sensitive adhesive according to claim 7, characterized in that: The tightening device (103) is a memory metal wire.

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