Carbon dioxide removal device and total acid content testing device

Abstract

The embodiment of the utility model provides a carbon dioxide removal device and a total acid content testing device, and relates to the technical field of analytical instruments. The oscillation cavity is driven by the driving assembly to rotate, liquid in the oscillation cavity reciprocates under the action of gravity in the rotating process, the large-amplitude oscillation effect is achieved, and free CO2 can be rapidly released and discharged through the exhaust channel. By utilizing the carbon dioxide removal device provided by the utility model, carbon dioxide in the beverage can be fully removed, and the accuracy of measuring the total acid content is improved; the number of oscillation times and amplitude can be fixed, so that the reproducibility of the detection method can be improved.

Description

Technical Field

[0001] This utility model relates to the field of analytical instrument technology, and more specifically, to a carbon dioxide removal device and a total acid content testing device. Background Technology

[0002] Carbonated beverages are produced by adding CO2 (carbon dioxide) under pressure, causing it to dissolve and form bound carbonic acid. When the CO2 content in a beverage is ≥1.5 times its volume, it is generally called a carbonated beverage. Carbonated beverages release CO2 in the mouth, providing a slight stimulating effect, absorbing some calories, and offering a refreshing taste. Total acidity is a crucial indicator in food, especially in beverages, alcoholic drinks, and condiments, directly determining the quality of the flavor. Total acidity refers to the total amount of measurable acidic substances in a product. Since there are many types of acids in food, and their composition varies, the highest-content acid is generally used. Because carbonic acid is unstable and easily decomposes to form free CO2, causing measurement bias, the total acid in food does not include this unstable and inaccurately measurable acid. Therefore, the CO2 in carbonated beverages needs to be removed before measurement; this process is usually called degassing or CO2 removal.

[0003] The solubility of CO2 in aqueous solution is relatively independent of temperature, pressure, and solution pH. Lower temperatures, higher pressures, and higher pH levels facilitate the conversion of CO2 into bound CO2 (carbonic acid), resulting in a greater solubility of CO2. There are generally three methods for degassing carbonated beverages or beverages containing CO2:

[0004] (1) Heating method

[0005] This method utilizes the thermal instability of carbonic acid to decompose it into CO2 and water through heating. The CO2 evaporates during heating, thus completely removing it. This principle is used in standards such as GB / T 12456-2008, "Determination of Total Acidity in Food." The disadvantages of this method are significant differences in heating equipment, heating power, and time, leading to substantial variations in laboratory settings. It can easily cause the volatilization of non-volatile acids (such as acetic acid) in beverages, resulting in lower total acidity readings. Because the process requires heating to a near boil and then cooling, the degassing time for a single sample is relatively long, making it unsuitable for determining the total acidity of beverages containing volatile acids, such as apple cider vinegar and aged vinegar drinks containing CO2. It is generally used for determining the total acidity of beverages without volatile acids, such as cola (which mainly contains phosphoric acid).

[0006] (2) Oscillating Exhaust Method

[0007] Carbonated beverages are often acidic. When subjected to impact and vibration at normal pressure, the pressure decreases instantaneously, causing carbonic acid in the beverage to convert into CO2, creating pressure. Degassing further reduces the pressure and the amount of dissolved gas, reaching a new dissolution equilibrium. Therefore, repeated shaking and degassing are used to reduce the amount of dissolved gas, thus achieving degassing. For example, in GB / T 4928-2008 "Analytical Methods for Beer," the general procedure involves using a conical flask and repeatedly shaking and degassing. However, due to insufficient shaking strength and difficulty in controlling the number of degassing cycles, some carbonic CO2 is not converted into free CO2, resulting in insufficient degassing (CO2 removal). This can easily lead to an overestimation of the total acidity and make reproducibility difficult to control.

[0008] (3) Ultrasonic oscillator treatment

[0009] Using an ultrasonic oscillator to degas beverages is extremely effective at removing free CO2. However, due to the small amplitude of ultrasonic oscillation, it is often difficult to remove bound ionic CO2, resulting in higher total acidity levels and a lack of reproducibility, making it unsuitable for total acidity determination.

[0010] Therefore, there is an urgent need to develop devices that can effectively remove carbon dioxide from beverages, while ensuring good reproducibility of the carbon dioxide removal effect. Utility Model Content

[0011] The purpose of this invention is to provide a carbon dioxide removal device and a total acid content testing device, which aim to fully remove carbon dioxide from beverages, have good reproducibility, and help improve the accuracy of total acid content determination.

[0012] The embodiments of this utility model can be implemented as follows:

[0013] In a first aspect, the present invention provides a carbon dioxide removal device, comprising an oscillating cavity for containing a liquid to be degassed and a drive assembly for driving the oscillating cavity to rotate, so that the liquid in the oscillating cavity reciprocates under the action of gravity through the drive assembly.

[0014] One end of the oscillation chamber is sealed, and the other end is detachably connected to a sealing cover. An exhaust channel is connected to the side wall of the oscillation chamber.

[0015] In an optional embodiment, it further includes: a vertical support rod, and a drive assembly including a rocker arm, a rocker arm connecting rod, and a cavity fixing clamp. The oscillation cavity is mounted on the cavity fixing clamp, the rocker arm connecting rod is mounted on the vertical support rod, the rocker arm is connected to one end of the rocker arm connecting rod, and the cavity fixing clamp is connected to the other end of the rocker arm connecting rod. Rotating the rocker arm will drive the cavity fixing clamp to rotate through the rocker arm connecting rod, thereby driving the oscillation cavity to rotate.

[0016] In an optional embodiment, a mounting hole is provided on the rocker arm connecting rod, and a rotating connector is provided in the mounting hole;

[0017] The rocker arm connecting rod includes a first connecting rod and a second connecting rod. One end of the first connecting rod is connected to the rocker arm, and the other end of the first connecting rod is connected to one end of the rotating connecting member. One end of the second connecting rod is connected to the other end of the rotating connecting member, and the other end of the second connecting rod is connected to the cavity fixing clamp.

[0018] Both the first and second connecting rods are damped.

[0019] In an optional embodiment, the cavity fixing clamp includes a top clamping member, a bottom clamping member, and a connecting side arm for connecting the top clamping member and the bottom clamping member, and the rocker arm connecting rod is connected to the connecting side arm.

[0020] Both the top and bottom clamping parts are provided with clamping notches that match the shape of the oscillation cavity.

[0021] In an optional implementation, a base is also included, with the bottom of the vertical support rod fixedly connected to the base.

[0022] In an optional embodiment, the oscillation cavity includes a first cavity segment, a second cavity segment, and a third cavity segment from top to bottom. The second cavity segment is cylindrical. The inner diameters of the ends of the first cavity segment and the third cavity segment are both larger than the inner diameter of the second cavity segment. The diameters of the first cavity segment and the third cavity segment gradually increase from the end closer to the second cavity segment to the end farther away from the second cavity segment.

[0023] In an optional embodiment, a protruding buffer cavity is provided in the middle of the oscillation cavity, an exhaust channel is installed on the buffer cavity, and an exhaust port is provided at the end of the exhaust channel.

[0024] In an optional embodiment, an overflow collection chamber is provided on the exhaust passage.

[0025] In an optional embodiment, a rotating connecting plug is provided on the exhaust passage between the buffer chamber and the overflow collection chamber.

[0026] Secondly, this utility model provides a total acid content testing device, including the carbon dioxide removal device of any of the foregoing embodiments.

[0027] The beneficial effects of the carbon dioxide removal device and total acid content testing device provided in this embodiment of the invention include: The driving component drives the oscillating chamber to rotate, causing the liquid in the oscillating chamber to reciprocate under gravity during rotation, achieving a large-amplitude oscillation effect, which can quickly release free CO2, which is then discharged through the exhaust channel. The carbon dioxide removal device provided by this invention can effectively remove carbon dioxide from beverages, improving the accuracy of total acid content determination; since the number of oscillations and the amplitude can be fixed, it is beneficial to improve the reproducibility of the testing method. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the carbon dioxide removal device provided in this embodiment;

[0030] Figure 2 for Figure 1 A schematic diagram of the middle rocker arm connecting rod.

[0031] Icons: 001 - Rotation direction; 100 - Carbon dioxide removal device; 110 - Oscillating chamber; 111 - Sealing cover; 112 - First chamber section; 113 - Second chamber section; 114 - Third chamber section; 115 - Buffer chamber; 120 - Drive assembly; 121 - Rocker arm; 122 - Rocker arm connecting rod; 1221 - First connecting rod; 1222 - Second connecting rod; 123 - Chamber fixing clamp; 1231 - Top clamp; 1232 - Bottom clamp; 1233 - Connecting side arm; 130 - Exhaust channel; 131 - Exhaust port; 132 - Overflow collection chamber; 133 - Rotating connecting plug; 141 - Vertical support rod; 142 - Base. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0038] Please refer to Figure 1 This utility model provides a carbon dioxide removal device 100, including an oscillating chamber 110 and a driving component 120. The liquid to be degassed (such as a carbon dioxide-containing beverage) is placed in the oscillating chamber 110, and the driving component 120 drives the oscillating chamber 110 to rotate from top to bottom, so that the liquid in the oscillating chamber 110 reciprocates under the action of gravity (forming an oscillation similar to free fall), which has a very large oscillation amplitude, which is conducive to the rapid removal of carbon dioxide.

[0039] One end of the oscillation cavity 110 is sealed (e.g.) Figure 1 The oscillation chamber 110 has a sealed bottom end and a detachable sealing cap 111 on the other end. After opening the sealing cap 111, liquid to be degassed can be added, and then the sealing cap 111 is used to seal the chamber. The connection method between the sealing cap 111 and the oscillation chamber 110 is not limited; it can be a snap-fit ​​connection, a threaded connection, etc., as long as the sealing cap 111 provides a sealing effect and prevents liquid leakage. An exhaust channel 130 is connected to the side wall of the oscillation chamber 110, and an exhaust port 131 is provided at the end of the exhaust channel 130 to promptly discharge carbon dioxide generated during the oscillation process.

[0040] In some embodiments, the oscillating cavity 110 includes a first cavity segment 112, a second cavity segment 113, and a third cavity segment 114, arranged from top to bottom. The second cavity segment 113 is located in the middle and is the main body of the oscillating cavity 110. The second cavity segment 113 can be cylindrical. The inner diameters of the ends of the first cavity segment 112 and the third cavity segment 114 are both larger than the inner diameter of the second cavity segment 113. That is, the diameters of the two ends of the oscillating cavity 110 are larger, while the diameter of the middle main body is smaller. The diameter of the first cavity segment 112 gradually increases from the end near the second cavity segment 113 to the end away from the second cavity segment 113, i.e., the cross-section of the first cavity segment 112 is trapezoidal. Similarly, the diameter of the third cavity segment 114 gradually increases from the end near the second cavity segment 113 to the end away from the second cavity segment 113, and its cross-section is also trapezoidal. The larger diameters at both ends of the oscillating cavity 110 facilitate the provision of space for the vigorous ejection or overflow of liquid, promoting the removal of carbon dioxide.

[0041] In some embodiments, a raised buffer cavity 115 is provided in the middle of the oscillating cavity 110, and an exhaust channel 130 is installed on the buffer cavity 115. The cross-section of the buffer cavity 115 is arc-shaped, and its three-dimensional shape can be a hemispherical or conical container. When a large amount of CO2 is released from the solution, the buffer cavity 115 can provide a buffer space for foam elimination, and can also provide space for the solution to fall back during rotation, preventing it from being flushed out of the column by CO2; at the same time, it is connected to a spherical container to form a CO2 discharge buffer, providing a larger decompression space and preventing the solution from violently spraying out or overflowing.

[0042] Furthermore, an overflow collection chamber 132 is provided on the exhaust passage 130. The overflow collection chamber 132 can temporarily collect overflowing liquid and prevent it from overflowing from the exhaust port 131 of the exhaust passage 130. A rotary connecting plug 133 is provided on the exhaust passage 130 between the buffer chamber 115 and the overflow collection chamber 132. The rotary connecting plug 133 can be a common valve, serving as a control valve for connecting to the outside world. When the valve is rotated, it opens to the connecting state.

[0043] In some embodiments, the carbon dioxide removal device 100 further includes a vertical support rod 141 and a base 142, with the bottom of the vertical support rod 141 fixedly connected to the base 142, and the drive assembly 120 mounted on the vertical support rod 141. The vertical support rod 141 and the base 142 can be fixed by welding or other methods to ensure stable operation of the device during rotation.

[0044] Furthermore, the drive assembly 120 includes a rocker arm 121, a rocker arm connecting rod 122, and a cavity fixing clamp 123. The oscillation cavity 110 is mounted on the cavity fixing clamp 123, the rocker arm connecting rod 122 is mounted on the vertical support rod 141, the rocker arm 121 is connected to one end of the rocker arm connecting rod 122, and the cavity fixing clamp 123 is connected to the other end of the rocker arm connecting rod 122. During operation, the operator manually rotates the rocker arm 121, causing the rocker arm connecting rod 122 and the cavity fixing clamp 123 to rotate, thereby driving the oscillation cavity 110 to rotate.

[0045] In some embodiments, the rocker arm connecting rod 122 is provided with a mounting hole (not shown), and a rotating connector (not shown) is provided within the mounting hole. The size of the rotating connector matches the mounting hole, allowing it to rotate within the mounting hole. Specifically, the mounting hole can be a circular hole penetrating the vertical support rod 141, and the rotating connector can be a cylinder that mates with the circular hole and passes through the mounting hole. Figure 2 As shown, the rocker arm connecting rod 122 includes a first connecting rod 1221 and a second connecting rod 1222. One end of the first connecting rod 1221 is connected to the rocker arm 121, and the other end is connected to one end of the rotating connecting member. One end of the second connecting rod 1222 is connected to the other end of the rotating connecting member, and the other end is connected to the cavity fixing clamp 123. Specifically, the end of the rotating connecting member can be threaded, and the first connecting rod 1221 and the second connecting rod 1222 can be connected to the rotating connecting member by means of threaded connection, rotating around the rotation direction 001 during the process.

[0046] To enhance the oscillation effect, both the first connecting rod 1221 and the second connecting rod 1222 are equipped with damping. This causes a brief pause when the column is in a vertical position, increasing the time spent in the vertical state. This allows the beverage, still on the middle wall of the column, to fall back and collect, increasing the height of the next free fall. The method of damping is not limited; existing damping methods can be used.

[0047] In some embodiments, the cavity fixing clamp 123 includes a top clamping member 1231, a bottom clamping member 1232, and a connecting side arm 1233 for connecting the top clamping member 1231 and the bottom clamping member 1232, with the rocker arm connecting rod 122 connected to the connecting side arm 1233. Clamping the oscillating cavity 110 with the top clamping member 1231 and the bottom clamping member 1232 improves clamping stability. The top clamping member 1231, the bottom clamping member 1232, and the connecting side arm 1233 can be fixed by welding, or the top clamping member 1231 and the bottom clamping member 1232 can be detachably connected.

[0048] Furthermore, both the top clamping member 1231 and the bottom clamping member 1232 are provided with clamping notches (not shown) that match the shape of the oscillation cavity 110. Structures such as rubber fixing rings can be provided at the clamping notches to improve the stability of clamping.

[0049] This utility model embodiment also provides a total acid content testing device, including the above-mentioned carbon dioxide removal device 100, and may also include related equipment for total acid content titration testing.

[0050] This invention also provides a method for determining the total acid content of carbon dioxide-containing beverages, comprising: removing carbon dioxide using the degassing method provided in this invention, followed by testing the total acid content using an alkaline solution titration method. Compared to the national standard method, the pretreatment operation is more precise, the results are closer to the true value, and the accuracy of the measurement can be improved.

[0051] The specific titration method can adopt the national standard method, such as GB 12456-2021 "National Food Safety Standard - Determination of Total Acid in Food", but is not limited to this.

[0052] In some embodiments, the process of testing the total acid content using alkaline solution titration includes: diluting the degassed sample with carbon dioxide-free water; if the sample is turbid, it can be filtered before sampling; titrating with NaOH standard solution; observing the change in pH value of the solution; and titrating to the endpoint (the endpoint pH value calculated with phosphoric acid is 8.7-8.8, and the endpoint pH value calculated with other acids is 8.2); simultaneously, a blank test is performed using carbon dioxide-free water instead of the sample. Using NaOH standard solution for titration and performing a blank test is simple, easy to perform, and provides high accuracy.

[0053] Furthermore, the formula for calculating the total acid content of the sample is as follows:

[0054]

[0055] In the formula:

[0056] X represents the total acidity of the sample, in g / L or g / kg;

[0057] c represents the concentration of the NaOH standard solution used in the titration, in mol / L;

[0058] V1 represents the amount of NaOH standard solution consumed by the sample, in mL;

[0059] V2 represents the amount of NaOH standard solution consumed in the blank test, in mL;

[0060] k represents the mass of acid equivalent to 1.00 mL of 1 mol / L NaOH standard solution, in g / mmol; for example: malic acid, 0.067; acetic acid, 0.060; tartaric acid, 0.075; citric acid, 0.064; citric acid (containing one molecule of water of crystallization), 0.070; lactic acid, 0.090; hydrochloric acid, 0.036; sulfuric acid, 0.049; phosphoric acid, 0.049; vinegar beverages are generally calculated using acetic acid.

[0061] F indicates the sample dilution factor, with 1 representing no dilution.

[0062] m represents the sample volume, in mL or g.

[0063] Measurement control requirements: The same sample shall be measured twice, and the average value shall be taken. The result shall be retained to two decimal places. Under repeatability conditions, the absolute difference between two independent measurements shall not exceed 2% of the arithmetic mean.

[0064] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0065] Example 1

[0066] This embodiment provides a method for determining the total acid content of carbon dioxide-containing beverages, the steps of which are as follows:

[0067] (1) Degassing

[0068] use Figure 1 The carbon dioxide removal device 100 in the middle is used for degassing. The device has the following dimensions: the inner diameter of the end of the first chamber section 112 is 120mm and the height is 50mm; the height of the second chamber section 113 is 400-450mm and the inner diameter is 80mm; the height of the third chamber section 114 is 50mm and the inner diameter of the end is 120mm.

[0069] The ratio of the liquid volume to the total volume of the oscillating chamber 110 is 1:(14-15).

[0070] Take about 200 mL of the gas-containing sample and place it in the above degassing device. Open the exhaust valve and rotate it 30-50 times to remove the CO2 gas. Control the number of rotations to be 6 every 30 seconds.

[0071] (2) Titration

[0072] Take 25 mL of the degassed sample by volume or 25 g by weight, accurate to 0.01 g (sample volume is m). (If the sample is turbid, filter it with rapid filter paper, discard the initial filtrate, collect the subsequent filtrate, and then take the sample again. If the sample is too acidic, dilute it with CO2-free water first, with a dilution factor of F, and then take the sample). Place the sample in a 200 mL beaker and add 75 mL of CO2-free water. Place the beaker on an electromagnetic stirrer, immerse the pH meter electrode in the solution, and titrate with 0.1 mol / L sodium hydroxide standard solution (actual concentration is c). Observe the change in pH value of the solution at any time. When approaching the titration endpoint, slow down the titration speed and add half a drop at a time (maximum one drop) until the titration endpoint is reached. The volume consumed is V1. At the same time, use CO2-free water to replace the sample for a blank test. The volume consumed is V0. Calculate according to formula (1).

[0073] Measurement control requirements: The same sample shall be measured twice, and the average value shall be taken. The result shall be retained to two decimal places. Under repeatability conditions, the absolute difference between two independent measurements shall not exceed 2% of the arithmetic mean.

[0074] Calculate the total acid content according to formula (1).

[0075] Comparative Example 1

[0076] The only difference from Example 1 is that in step (1), the sample is treated by depressurization shaking in a conical flask (after filtration by a vacuum pump, the sample is kept under negative pressure and shaken continuously) for 3-4 minutes, and no obvious bubbles are released from the sample.

[0077] Experimental Example 1

[0078] The test examples and comparative examples provide the accuracy and reproducibility of the detection method, and the results are shown in Table 2.

[0079] Simultaneously, both a carbonated acetic acid solution (0.5% acetic acid solution, approximately 3 times the CO2 capacity) and a non-carbonated acetic acid solution (0.5% acetic acid solution) were prepared by diluting with acetic acid solution of the same concentration and sealed in aluminum cans. The former served as a simulated carbonated volatile acid beverage product, while the latter served as a non-carbonated volatile acid beverage, and was used as a benchmark to select a degassing method that closely approximates real-world conditions.

[0080] Table 2 Comparison of the effects of different degassing methods in the examples and comparative examples.

[0081]

[0082]

[0083] It can be seen that the result of the degassing device after rotating 40 times is closest to the actual result, and the result deviation does not exceed the requirement of 2%.

[0084] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A carbon dioxide removal device, characterized in that, It includes an oscillating cavity for containing the liquid to be degassed and a drive assembly for driving the oscillating cavity to rotate, so that the liquid in the oscillating cavity reciprocates under the action of gravity through the drive assembly; One end of the oscillation chamber is sealed, and the other end is detachably connected to a sealing cover. An exhaust channel is connected to the side wall of the oscillation chamber.

2. The carbon dioxide removal device according to claim 1, characterized in that, Also includes: The vertical support rod and the driving assembly include a rocker arm, a rocker arm connecting rod, and a cavity fixing clamp. The oscillation cavity is mounted on the cavity fixing clamp, the rocker arm connecting rod is mounted on the vertical support rod, the rocker arm is connected to one end of the rocker arm connecting rod, and the cavity fixing clamp is connected to the other end of the rocker arm connecting rod. Rotating the rocker arm will drive the cavity fixing clamp to rotate through the rocker arm connecting rod, thereby driving the oscillation cavity to rotate.

3. The carbon dioxide removal device according to claim 2, characterized in that, The rocker arm connecting rod is provided with a mounting hole, and a rotating connecting piece is provided in the mounting hole; The rocker arm connecting rod includes a first connecting rod and a second connecting rod. One end of the first connecting rod is connected to the rocker arm, and the other end of the first connecting rod is connected to one end of the rotating connecting member. One end of the second connecting rod is connected to the other end of the rotating connecting member, and the other end of the second connecting rod is connected to the cavity fixing clamp. Both the first connecting rod and the second connecting rod are damped.

4. The carbon dioxide removal device according to claim 2, characterized in that, The cavity fixing clamp includes a top clamping member, a bottom clamping member, and a connecting side arm for connecting the top clamping member and the bottom clamping member, and the rocker arm connecting rod is connected to the connecting side arm; Both the top clamping member and the bottom clamping member are provided with clamping notches that match the shape of the oscillation cavity.

5. The carbon dioxide removal device according to claim 2, characterized in that, It also includes a base, and the bottom of the vertical support rod is fixedly connected to the base.

6. The carbon dioxide removal device according to claim 1, characterized in that, The oscillation cavity includes a first cavity segment, a second cavity segment, and a third cavity segment from top to bottom. The second cavity segment is cylindrical. The inner diameter of the ends of the first cavity segment and the third cavity segment is larger than the inner diameter of the second cavity segment. The diameter of the first cavity segment and the third cavity segment gradually increases from the end closer to the second cavity segment to the end farther away from the second cavity segment.

7. The carbon dioxide removal apparatus according to claim 1 or 6, characterized in that, The oscillation cavity has a protruding buffer cavity in the middle, the exhaust channel is installed on the buffer cavity, and the end of the exhaust channel is provided with an exhaust port.

8. The carbon dioxide removal apparatus according to claim 7, characterized in that, An overflow collection chamber is provided on the exhaust channel.

9. The carbon dioxide removal apparatus according to claim 8, characterized in that, A rotating connecting plug is provided on the exhaust channel between the buffer cavity and the overflow collection cavity.

10. A total acid content testing device, characterized in that, Includes the carbon dioxide removal apparatus according to any one of claims 1-9.

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