Gas purifying and filtering device for laboratory

Abstract

The utility model discloses a gas purifying and filtering device for a laboratory, which relates to the technical field of laboratory gas chromatography gas detection and comprises a cylinder, a gas inlet pipe and a gas outlet pipe, the cylinder is of a closed structure, a first cavity and a second cavity are arranged in the cylinder, the first cavity is used for placing a first filtering material, and the second cavity is used for placing a second filtering material. The first cavity is used for containing a first filtering material, the first filtering material can adsorb impurity particles and part of moisture in the gas sample, the second cavity is used for containing a second filtering material, and the second filtering material is used for conducting secondary filtering and moisture adsorption on the gas sample; one end of the gas inlet pipe is connected with the first end of the cylinder and communicated with the first cavity, and the other end of the gas inlet pipe is communicated with a tested gas sampling bag; the gas outlet pipe is connected with the second end of the cylinder and is communicated with the second cavity, the other end of the gas outlet pipe is communicated with a gas chromatograph, the structure is simple, the use is convenient, and the condition that the sample inlet is blocked or the capillary column is blocked is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory gas chromatography gas detection, in particular to a laboratory gas purification and filtering device. Background Art

[0002] Currently, there are two types of gases used in gas chromatography testing in chemical industry laboratories: purified gas and non-purified gas. Purified gas is characterized by a pure gas sample, free of impurities or low in impurities, and free of moisture. Non-purified gas, typically waste gas or recycled gas, is characterized by the presence of large molecular particles, organic particles, or significant amounts of moisture. Therefore, when testing non-purified gas, gas chromatography often experiences sample inlet or capillary column blockage. To address these issues, we developed this patented design. Utility Model Content

[0003] The purpose of the utility model is to provide a laboratory gas purification and filtering device to solve the problems existing in the above-mentioned prior art. It has a simple structure, is easy to use, and can effectively avoid the blockage of the sample inlet or the capillary column.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The utility model provides a laboratory gas purification and filtering device, comprising: a cylinder, an air inlet pipe and an air outlet pipe, the cylinder being a closed structure, a first cavity and a second cavity being arranged in the cylinder, the first cavity being used to place a first filter material, the first filter material being able to adsorb impurity particles and part of the moisture in the gas sample, the second cavity being used to place a second filter material, the second filter material being used to perform secondary filtration and moisture adsorption on the gas sample; one end of the air inlet pipe being used to be connected to the first end of the cylinder and being communicated with the first cavity, and the other end being used to be communicated with a sampling bag of the gas to be measured; the air outlet pipe being connected to the second end of the cylinder and being communicated with the second cavity, and the other end being used to be communicated with a gas chromatograph.

[0006] Preferably, the first filter material is activated carbon.

[0007] Preferably, the second filter material comprises molecular sieve.

[0008] Preferably, the second filter material further includes silica gel balls, the molecular sieve is arranged on a side of the second cavity close to the first cavity, and the silica gel balls are arranged on a side of the second cavity close to the air outlet pipe.

[0009] Preferably, the volume ratio of the activated carbon, the molecular sieve and the silica gel balls is 1:2:2.

[0010] Preferably, it further comprises a first filter membrane, wherein the first filter membrane is arranged between the first cavity and the second cavity.

[0011] Preferably, it further comprises a second filter membrane, which is arranged between the second cavity and the air outlet pipe.

[0012] Preferably, the first filter membrane and the second filter membrane are made of resin fiber material.

[0013] Compared with the prior art, the utility model has achieved the following technical effects:

[0014] The utility model provides a gas purification and filtering device for laboratory use, in which a sampling bag of a gas to be tested is connected to an air inlet pipe of a cylinder through a hose, so that the gas sample gradually passes through a first filter material and a second filter material in sequence, and then enters an air inlet valve of a gas chromatograph through an air outlet pipe; impurity particles and moisture in the gas sample can be effectively filtered through the first filter material and the second filter material, the utility model has a simple structure, is easy to use, and effectively avoids the situation where the sample inlet or the capillary column is blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the structure of the laboratory gas purification and filtration device provided by the utility model;

[0017] In the figure: 1. Cylinder; 2. Air inlet pipe; 3. Air outlet pipe; 4. Activated carbon; 5. Molecular sieve; 6. Silica gel ball; 7. First filter membrane; 8. Second filter membrane. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The purpose of the utility model is to provide a laboratory gas purification and filtering device to solve the problems existing in the above-mentioned prior art. It has a simple structure, is easy to use, and can effectively avoid the blockage of the sample inlet or the capillary column.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] The utility model provides a laboratory gas purification and filtering device, such as Figure 1 As shown, it includes: a cylinder 1, an air inlet pipe 2 and an air outlet pipe 3. The cylinder 1 is a closed structure. A first cavity and a second cavity are provided in the cylinder 1. The first cavity is used to place a first filter material, which can adsorb impurity particles and part of the water in the gas sample. The second cavity is used to place a second filter material, which is used to perform secondary filtration and water adsorption on the gas sample. One end of the air inlet pipe 2 is used to be connected to the first end of the cylinder 1 and communicate with the first cavity, and the other end is used to communicate with a gas sampling bag to be measured. The air outlet pipe 3 is connected to the second end of the cylinder 1 and communicates with the second cavity, and the other end is used to communicate with a gas chromatograph. The gas sampling bag to be measured is connected to the air inlet pipe 2 of the cylinder 1 through a hose, so that the gas sample passes through the first filter material and the second filter material in sequence and then enters the air inlet valve of the gas chromatograph through the air outlet pipe 3. The first filter material and the second filter material can effectively filter impurity particles and water in the gas sample. The structure is simple and easy to use, and can effectively avoid the problem of sample inlet blockage or capillary column blockage.

[0022] In a preferred embodiment, the first filter material is activated carbon 4, which is used to adsorb impurity particles and some water in the gas sample. Due to the porous structure of the activated carbon 4 itself and its brittle texture, it is easy to break when it is loaded or moved into the bottle, preventing the activated carbon 4 powder from entering the gas sample. A filter membrane is sandwiched between the activated carbon 4 and the molecular sieve 5. Activated carbon is amorphous carbon with a microporous structure and a large surface area. It can be used for permanent gases and low-boiling hydrocarbons and can adsorb some particulate impurities. At the same time, in order to prevent the activated carbon 4 powder from entering the chromatographic column, we load the activated carbon into the side closest to the sample.

[0023] In a preferred embodiment, the second filter material includes molecular sieve 5, which has a strong adsorption capacity and is resistant to high temperatures. Since the molecular sieve 5 has multiple pores and holes, it has good adsorption performance, so it is an excellent adsorbent for dehydration. The molecular sieve 5 has a strong adsorption capacity and is resistant to high temperatures. Since the molecular sieve 5 has multiple pores and holes, it has good adsorption performance, so it is an excellent adsorbent for dehydration.

[0024] In a preferred embodiment, the second filter material also includes silica gel balls 6. Molecular sieve 5 is positioned on the side of the second cavity near the first cavity, and silica gel balls 6 are positioned on the side of the second cavity near the exhaust pipe 3. Silica gel is a highly hydrogen-bonded solid adsorbent with a chemical composition of mSiO2·nH2O. It possesses strong chemical and thermal stability, maintaining its original physical and chemical properties at high temperatures. Due to its high bulk density and significant moisture absorption at low humidity, silica gel can absorb and retain up to 40%-50% of its own weight in water. Due to its strong stability and water absorption, silica gel is the preferred material.

[0025] In a preferred embodiment, the volume ratio of activated carbon 4, molecular sieve 5 and silica gel ball 6 is 1:2:2, which has the best effect, small sample airflow resistance, and the filtered gas is basically pure gas. At the same time, the blockage of the chromatographic inlet, capillary column, nozzle, etc. is reduced. After gas chromatography testing, the data has no bias, no crossover and other abnormal conditions.

[0026] In a preferred embodiment, the laboratory gas purification and filtering device further includes a first filter membrane 7, which is disposed between the first cavity and the second cavity.

[0027] In a preferred embodiment, the laboratory gas purification and filtering device further includes a second filter membrane 8 , which is disposed between the second cavity and the gas outlet pipe 3 .

[0028] In a preferred embodiment, the first filter membrane 7 and the second filter membrane 8 are made of resin fiber material with a dense texture, and can be used to filter and purify particulate matter in the gas to prevent dust particles from entering the detector.

[0029] In a preferred embodiment, the diameter of the cylinder 1 is about 5-6 cm, and the cylinder 1 is a resin hollow tube.

[0030] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A laboratory gas purification and filtration device, characterized by: include: The cylinder is a closed structure, and a first cavity and a second cavity are provided in the cylinder. The first cavity is used to place a first filter material, which can absorb impurity particles and some water in the gas sample. The second cavity is used to place a second filter material, which is used to perform secondary filtration and water absorption on the gas sample. an air inlet pipe, one end of which is connected to the first end of the cylinder and communicates with the first cavity, and the other end of which is communicated with a sampling bag of the gas to be measured; and An air outlet pipe is connected to the second end of the cylinder and communicates with the second cavity, and the other end is used to communicate with the gas chromatograph.

2. The laboratory gas purification and filtering device according to claim 1, characterized in that: The first filter material is activated carbon.

3. The laboratory gas purification and filtering device according to claim 2, characterized in that: It also includes a first filter membrane, which is arranged between the first cavity and the second cavity.

4. The laboratory gas purification and filtering device according to claim 3, characterized in that: It also includes a second filter membrane, which is arranged between the second cavity and the air outlet pipe.

5. The laboratory gas purification and filtering device according to claim 4, characterized in that: The first filter membrane and the second filter membrane are made of resin fiber material.

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