An oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline

Abstract

This utility model discloses an oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline, comprising a control valve group, an oil filter, and an oil suction device connected sequentially via connecting pipelines. The control valve group is used to control the pressure and injection volume of the sample gas. The oil filter includes a first top cover, an inlet pipe, and a first outlet pipe, with the inlet pipe and the first outlet pipe extending into the oil filter through the first top cover. The oil filter is filled with adsorbent, with the inlet pipe submerged below the surface of the adsorbent liquid and the first outlet pipe positioned above the surface of the adsorbent liquid. The oil suction device is filled with adsorbent material, with the first outlet pipe extending into the oil suction device through its bottom and contacting the adsorbent material. The oil suction device also includes a second top cover and a second outlet pipe, one end of which extends into the oil suction device through the second top cover and is positioned above the adsorbent material. This device is used to completely remove active polypropylene particles and dust impurities from the sample gas before it enters the gas chromatograph. It has a simple structure and a high removal rate.

Description

Technical Field

[0001] This utility model relates to the field of analytical instrument technology, and in particular to an oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline. Background Technology

[0002] In gas chromatography, reactive polypropylene particles and dust undergo polymerization when the flow rate slows down, causing the particles to gradually grow and block the pipeline. The outer diameter of the internal pipelines in a gas chromatograph is typically 1 / 16 inch, and the column diameter is even smaller; during pretreatment, a 1 / 4-inch (6 mm) outer diameter pipeline is commonly used, with the flow rate generally controlled at 8-12 L / h. When the sample enters the gas chromatograph from the pretreatment pipeline, the sample flow rate is reduced to 0-30 mL / min. If the reactive polypropylene particles and dust polymerize inside the chromatograph at this rate, it will cause blockage of the pipeline and column, leading to instrument malfunction.

[0003] In existing polypropylene circulating gas chromatography pretreatment devices, the circulating gas carries reactive polypropylene particles and dust. Given the relatively high sample pressure and flow rate, filters, pressure reducing valves, and flow meters are needed before the sample gas enters the instrument to adjust the pressure and flow rate to suitable values. Using a filter can trap particles and dust externally, preventing mechanical impurities from entering the chromatograph and causing blockage. However, existing polypropylene circulating gas chromatography pretreatment devices cannot trap microparticles smaller than 0.5 μm in the feed gas. These microparticles, once inside the chromatograph, can cause blockages in the pipeline and column. Utility Model Content

[0004] Objective: In order to overcome the shortcomings of the existing technology, this utility model provides an oil-cotton composite adsorption device for impurities in the gas chromatography injection pipeline, which removes active polypropylene particles and dust in the sample gas before it enters the gas chromatograph, thus preventing pipeline blockage.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides an oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline. The impurities include active polypropylene particles and dust. The oil-cotton composite adsorption device includes a control valve group, an oil filter and an oil suction device connected in sequence through connecting pipelines. The control valve assembly is used to control the pressure and injection rate of the sample gas. The oil filter includes a first top cover, an air inlet pipe, and a first air outlet pipe, with the air inlet pipe and the first air outlet pipe extending into the interior of the oil filter through the first top cover; the interior of the oil filter is filled with adsorbent, with the air inlet pipe submerged below the surface of the adsorbent liquid and the first air outlet pipe located above the surface of the adsorbent liquid; it is used to adsorb active polypropylene particles and dust in the sample gas. The oil suction device is filled with adsorbent material. The first vent pipe extends into the oil suction device through the bottom and contacts the adsorbent material to adsorb oil droplets in the sample gas that has passed through the oil filter. The oil suction device also includes a second top cover and a second vent pipe with one end extending into the oil suction device through the second top cover and located above the adsorbent material.

[0007] The dual adsorption of the oil filter and the oil suction device removes active polypropylene particles and dust from the sample gas, preventing the adsorbent from entering subsequent pipelines and causing errors in the analytical results. The control valve group regulates the sample gas pressure and injection rate, ensuring a stable injection rate and improving the accuracy of gas chromatography analysis. The inlet pipe is submerged below the adsorbent liquid surface, and the first outlet pipe is located above the liquid surface to prevent the adsorbent from entering subsequent processes; the second outlet pipe is placed above the adsorbent material to avoid secondary entrainment of oil droplets.

[0008] In some embodiments, the control valve assembly includes a needle valve and a pressure reducing valve connected in sequence. The sample gas injection rate is controlled by the needle valve, and the pressure is controlled by the pressure reducing valve.

[0009] In some embodiments, a PTFE microporous filter membrane is fitted at the point where the first outlet pipe extends out of the first outlet cover, which can prevent the adsorbent from entering the subsequent pipe along with the sample gas.

[0010] In some embodiments, the adsorbent is 120# industrial white oil. Activated polypropylene particles and dust are completely adsorbed after being introduced into the 120# industrial white oil, while the circulating gas is not adsorbed by the 120# industrial white oil.

[0011] In some embodiments, the oil filter housing is made of transparent resin material, which facilitates observation of the oil level.

[0012] In some embodiments, the other end of the second outlet pipe is connected to a flow meter, and the sample gas flows through the flow meter and then into the gas chromatograph. The flow meter is used to adjust the flow rate of the sample gas entering the gas chromatograph.

[0013] In some embodiments, the adsorption material is industrial-grade PP oil-absorbing cotton, which can adsorb a small amount of oil droplets in the gas and prevent oil from entering the instrument.

[0014] In some embodiments, the first and second top covers are threaded caps, which are detachably connected to the oil filter and the oil suction device, respectively. The first top cover of the oil filter is a threaded cap, which allows for easy disassembly and oil replacement; the second top cover of the oil suction device is a threaded cap, which allows for timely replacement of the adsorption material as needed, thereby improving adsorption efficiency.

[0015] Beneficial effects: The oil-cotton composite adsorption device for impurities in the gas chromatography injection pipeline provided by this utility model has a simple structure and good adsorption and removal effect on active polypropylene particles and dust in the sample gas; the design of the control valve group ensures the stability of the injection pressure and injection volume, avoiding data deviation caused by pressure or flow fluctuations; the overall structure is easy to disassemble and assemble, and it is convenient to replace the adsorbent and adsorption material. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the oil-cotton composite adsorption device for active polypropylene particles and dust in the gas chromatography injection pipeline of this utility model embodiment.

[0018] In the diagram: 1. Oil filter, 2. Oil suction device, 3. Oil-absorbing cotton, 4. PTFE microporous filter membrane, 5. Needle valve, 6. Pressure reducing valve, F. Flow meter, GC. Gas chromatograph. Detailed Implementation

[0019] The technical solutions in 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 following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0021] Example 1:

[0022] This embodiment provides an oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline, such as... Figure 1 As shown, the impurities include active polypropylene particles and dust. The oil-cotton composite adsorption device includes a control valve group, an oil filter 1, and an oil suction device 2 connected in sequence via connecting pipelines. The control valve group includes a needle valve 5 and a pressure reducing valve 6 connected in sequence. The sample gas injection volume is controlled by the needle valve 5, the pressure is controlled by the pressure reducing valve 6, and the flow rate is adjusted by the flow meter F.

[0023] The oil filter 1 includes a first top cover, an air inlet pipe, and a first air outlet pipe. The air inlet pipe and the first air outlet pipe extend into the interior of the oil filter through the first top cover. The interior of the oil filter is filled with 120# industrial white oil. The air inlet pipe is submerged below the surface of the 120# industrial white oil, and the first air outlet pipe is located above the surface of the 120# industrial white oil.

[0024] A PTFE microporous filter membrane 4 is fitted at the point where the first vent pipe exits the first vent top cover.

[0025] The first top cover is a threaded cover, which can be easily removed for oil changes.

[0026] The outer shell of oil filter 1 is made of transparent resin material, making it easy to observe the oil level.

[0027] The oil suction device 2 is filled with oil-absorbing cotton 3. A first vent pipe extends into the oil suction device from the bottom and contacts the oil-absorbing cotton 3 to absorb oil droplets in the sample gas that has passed through the oil filter. The oil suction device also includes a second top cover and a second vent pipe, one end of which extends into the oil suction device from the second top cover and is located above the oil-absorbing cotton 3. The second top cover is a threaded cover, which allows for timely replacement of the absorbent material as needed.

[0028] The other end of the second outlet pipe is connected to a flow meter. The sample gas flows through the flow meter and then enters the gas chromatograph. The flow meter is used to adjust the flow rate of the sample gas entering the gas chromatograph.

[0029] Example 2:

[0030] Based on Example 1, this embodiment provides a pipeline connection method for an oil-cotton composite adsorption device for active polypropylene particles and dust in a gas chromatography injection pipeline, including: Install needle valve 5 and pressure reducing valve 6 in sequence, with pressure reducing valve 6 connected to one end of the intake pipe; The other end of the air intake pipe extends through the first top cover into the oil filter 1 and is submerged below the surface of 120# industrial white oil. One end of the first vent pipe is fitted with a PTFE microporous filter membrane 4, which then extends into the oil filter 1 through the first top cover. The position of the PTFE microporous filter membrane 4 is adjusted so that it adheres to the first top cover. The first vent pipe is located above the surface of the 120# industrial white oil and does not contact the surface. The other end of the first vent pipe is connected to the oil suction device 2. Specifically, it extends from the bottom of the oil suction device 2 into the interior of the oil suction device 2 and comes into contact with the oil-absorbing cotton 3. One end of the second vent pipe is inserted into the oil suction device 2 through the second top cover, and the second vent pipe does not contact the oil-absorbing cotton 3. The other end of the second outlet pipe is connected to the flow meter; Connect the flow meter to the gas chromatograph.

[0031] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this utility model and for simplifying the description, and are not intended to 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 utility model.

[0032] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline, characterized in that, The impurities include active polypropylene particles and dust, and the oil-cotton composite adsorption device includes a control valve group, an oil filter and an oil suction device connected in sequence by connecting pipelines. The control valve assembly is used to control the pressure and injection rate of the sample gas. The oil filter includes a first top cover, an air inlet pipe, and a first air outlet pipe, with the air inlet pipe and the first air outlet pipe extending into the interior of the oil filter through the first top cover; the interior of the oil filter is filled with adsorbent, with the air inlet pipe submerged below the surface of the adsorbent liquid and the first air outlet pipe located above the surface of the adsorbent liquid; it is used to adsorb active polypropylene particles and dust in the sample gas. The oil suction device is filled with adsorbent material. The first vent pipe extends into the oil suction device through the bottom and contacts the adsorbent material to adsorb oil droplets in the sample gas that has passed through the oil filter. The oil suction device also includes a second top cover and a second vent pipe with one end extending into the oil suction device through the second top cover and located above the adsorbent material.

2. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1, characterized in that, The control valve group includes a needle valve and a pressure reducing valve connected in sequence. The sample gas injection rate is controlled by the needle valve, and the pressure is controlled by the pressure reducing valve.

3. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1, characterized in that, A PTFE microporous filter membrane is fitted at the point where the first vent pipe extends out of the first vent top cover.

4. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1 or 3, characterized in that, The adsorbent is 120# industrial white oil.

5. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1 or 3, characterized in that, The oil filter housing is made of transparent resin material.

6. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1, characterized in that, The other end of the second outlet pipe is connected to a flow meter. The sample gas flows through the flow meter and then enters the gas chromatograph. The flow meter is used to adjust the flow rate of the sample gas entering the gas chromatograph.

7. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1, characterized in that, The adsorbent material is industrial-grade PP oil-absorbing cotton.

8. The oil-cotton composite adsorption device for impurities in a gas chromatography injection pipeline according to claim 1, characterized in that, The first and second top covers are threaded covers and are detachably connected to the oil filter and the oil suction device, respectively.

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