Sample introduction dehumidification device of gas chromatograph

Abstract

The utility model relates to the technical field of gas chromatographic instruments, and provides a gas chromatographic instrument sample introduction dehumidification device which comprises a gas chromatographic instrument body, an automatic sample introduction tower arranged at a sample introduction port of the gas chromatographic instrument body and used for sample introduction of chlorosilane liquid; the protective cover is arranged on the automatic sample injection tower in a sealing and covering manner; wherein the protective cover is filled with flowing protective gas, and the relative pressure of the protective gas is 8-12Pa (G), so that the interior of the protective cover is always in a micro-positive pressure state. Through the protection cover which is filled with flowing protection gas and maintains a micro-positive pressure state, air can be isolated from the automatic sample injection tower so as to realize the dehumidification purpose, the efficient operation of the automatic sample injection tower can be ensured, the accuracy of the content measurement result of the chlorosilane component is effectively improved, and the product quality is improved. Meanwhile, the service time of the expensive automatic sample injection needle is prolonged, so that the replacement frequency of the automatic sample injection needle is reduced, and cost reduction and efficiency improvement of chlorosilane component analysis are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of gas chromatographs, in particular to a gas chromatograph sample introduction and dehumidification device. Background Art

[0002] Chlorosilane liquids are a class of organic compounds containing chlorine and silicon atoms. They are colorless, flammable, volatile, and have a pungent odor. They have a low boiling point (approximately 57-58.8°C) and a density of 1.44-1.48 g / cm³. They are insoluble in water but soluble in organic solvents. When trichlorosilane (trichlorosilane SiHCl3) in chlorosilane liquid reacts with water, it produces silicon dioxide (SiO2), hydrochloric acid (HCl), and hydrogen (H2). The specific chemical equation is: SiHCl3 + 2H2O = SiO2 + 3HCl + H2.

[0003] Chlorosilane component analysis is primarily performed using gas chromatography. The gas chromatograph used is equipped with an automatic sampling tower and an automatic injection needle inserted into the chromatographic column. The chlorosilane liquid in the automatic injection tower is heated and vaporized, then injected into the chromatographic column through the automatic injection needle for separation. The peak area of ​​each component is recorded using a chromatographic workstation.

[0004] Currently, most gas chromatographs have unsealed automatic injection towers, resulting in direct contact between the chlorosilane liquid and air during injection. Due to the aforementioned characteristics, trichlorosilane in the chlorosilane liquid absorbs moisture from the air and hydrolyzes, causing the following problems:

[0005] 1. The silica formed by hydrolysis will clog the automatic injection needle and affect the injection, resulting in inaccurate determination of the chlorosilane component content;

[0006] 2. If the hydrochloric acid formed by hydrolysis escapes from the automatic injection tower, it may cause skin burns and mucous membrane irritation to the operator, and in severe cases may cause pneumonia or pulmonary edema;

[0007] 3. Due to the need for heating and vaporization, the inlet temperature of the gas chromatograph is relatively high, and chlorosilane easily evaporates into the air, thereby corroding and irritating the upper and lower respiratory tract, skin and eyes of the human body, causing fatal harm to human health. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the utility model provides a gas chromatograph sampling dehumidification device to solve the problem that the automatic sampling tower of the existing gas chromatograph is not sealed, which causes trichlorosilane in the chlorosilane liquid to absorb moisture in the air and hydrolyze, thereby clogging the automatic sampling needle and making the chlorosilane component content measurement result inaccurate.

[0009] To achieve the above objectives, the present invention provides the following technical solutions:

[0010] A gas chromatograph sample inlet dehumidification device, comprising:

[0011] A gas chromatograph body, the injection port of which is equipped with an automatic injection tower for injecting chlorosilane liquid; and

[0012] A protective cover and a sealing cover are arranged on the automatic sampling tower;

[0013] The protective cover is filled with flowing protective gas, and the relative pressure of the protective gas is 8-12 Pa (G), so that the protective cover is always in a slightly positive pressure state.

[0014] In one embodiment disclosed in the present application, the bottom side of the protective cover is connected to a gas storage tank via a first hose with a pressure regulating valve, and the gas storage tank stores protective gas;

[0015] An exhaust port is provided on the top of the protective cover, and the exhaust port is connected to an external universal exhaust cover through a second hose.

[0016] In one embodiment disclosed in the present application, the protective gas is nitrogen.

[0017] In one embodiment disclosed in the present application, the flow rate of the nitrogen gas is 5 mL / min.

[0018] In one embodiment disclosed in the present application, the diameter of the exhaust port is 5 mm.

[0019] In one embodiment disclosed in the present application, both the first hose and the second hose are latex tubes.

[0020] In one embodiment disclosed in the present application, the protective cover is made of a transparent heat-resistant acrylic plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By filling the protective cover with flowing protective gas and maintaining a slightly positive pressure state, the air can be isolated from the automatic sampling tower to achieve the purpose of dehumidification, which can ensure the efficient operation of the automatic sampling tower, effectively improve the accuracy of the chlorosilane component content determination results, and at the same time extend the service life of the expensive automatic sampling needle to reduce its replacement frequency, thereby achieving cost reduction and efficiency improvement in chlorosilane component analysis.

[0023] 2. The diameter of the exhaust port is 5mm, which can reduce the consumption of nitrogen while ensuring that the protective cover is always in a slightly positive pressure state.

[0024] 3. The protective cover is made of transparent heat-resistant acrylic sheet. The transparency of the acrylic sheet is conducive to the operator to observe the injection status of the automatic injection tower. The acrylic sheet is heat-resistant and can withstand the high temperature generated by the heating and vaporization of chlorosilane liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0027] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 As shown, the utility model provides a gas chromatograph sample inlet dehumidification device, comprising:

[0035] The gas chromatograph body 10 has an automatic sampling tower 11 installed at its sampling port for injecting chlorosilane liquid; and

[0036] The protective cover 20 and the sealing cover are provided on the automatic injection tower 11;

[0037] The protective cover 20 is filled with flowing protective gas, and the relative pressure of the protective gas is 8-12 Pa (G), so that the protective cover 20 is always in a slightly positive pressure state.

[0038] Before sampling, a protective gas with a relative pressure of 8 to 12 Pa (G) is filled into the protective cover 20 and kept flowing. This forces air out of the protective cover 20, maintaining a constant slight positive pressure inside. Air cannot enter the protective cover 20, isolating it from the automatic sampling tower 11, achieving dehumidification. During sampling, the chlorosilane liquid is prevented from coming into contact with air, preventing hydrolysis. In other words, by filling the protective cover 20 with flowing protective gas and maintaining a slight positive pressure, air is isolated from the automatic sampling tower 11, achieving dehumidification. This ensures efficient operation of the automatic sampling tower, effectively improving the accuracy of chlorosilane component content determination results, and extending the useful life of expensive automatic sampling needles, reducing their replacement frequency, thereby reducing costs and increasing efficiency in chlorosilane component analysis.

[0039] The bottom side of the protective cover 20 is connected to a gas tank 30 via a first hose 22 with a pressure-regulating valve 21. The gas tank 30 stores protective gas. An exhaust port 23 is located at the top of the protective cover 20, which is connected to an external, universal exhaust hood (not shown) via a second hose 24. The protective gas in the gas tank 30 is regulated to a pressure of 8-12 Pa(G) by the pressure-regulating valve 21 and then enters the protective cover 20 through the first hose 22. Simultaneously, some chlorosilane, which evaporates due to heating and vaporization, also enters the protective cover 20. It is then discharged through the exhaust port 23 at the top of the protective cover 20 and through the second hose 24 to the universal exhaust hood, creating a slightly positive pressure within the protective cover 20 and reducing any health risks.

[0040] In this embodiment, the protective gas is nitrogen (N2), which is easy to obtain and low in cost; the flow rate of nitrogen is 5 mL / min.

[0041] The diameter of the exhaust port 23 is 5 mm. In this way, the nitrogen consumption can be reduced while ensuring that the inside of the protective cover 20 is always in a slightly positive pressure state.

[0042] The first hose 22 and the second hose 24 are both latex tubes. The latex tubes are easy to connect and replace.

[0043] In this embodiment, the protective cover 20 is made of a transparent heat-resistant acrylic plate. The acrylic plate is transparent, which facilitates the operator to observe the injection status of the automatic injection tower 11; the acrylic plate is heat-resistant and can withstand the high temperature generated by the heating and vaporization of the chlorosilane liquid.

[0044] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A gas chromatograph sample dehumidification device, characterized in that: include: The gas chromatograph body has an automatic sampling tower installed on its sampling port for the injection of chlorosilane liquid; and A protective cover and a sealing cover are arranged on the automatic sampling tower; The protective cover is filled with flowing protective gas, and the relative pressure of the protective gas is 8-12 Pa (G), so that the protective cover is always in a slightly positive pressure state.

2. The gas chromatograph sample inlet dehumidification device according to claim 1, characterized in that: The bottom side of the protective cover is connected to a gas storage tank via a first hose with a pressure regulating valve, and the gas storage tank stores protective gas; An exhaust port is provided on the top of the protective cover, and the exhaust port is connected to an external universal exhaust cover through a second hose.

3. The gas chromatograph sample introduction dehumidification device according to claim 1 or 2, characterized in that: The protective gas is nitrogen.

4. The gas chromatograph sample inlet dehumidification device according to claim 3, characterized in that: The flow rate of the nitrogen gas is 5 mL / min.

5. The gas chromatograph sample inlet dehumidification device according to claim 2, characterized in that: The diameter of the exhaust port is 5 mm.

6. The gas chromatograph sample introduction dehumidification device according to claim 2 or 5, characterized in that: The first hose and the second hose are both latex hoses.

7. The gas chromatograph sample inlet dehumidification device according to claim 1, characterized in that: The protective cover is made of a transparent heat-resistant acrylic plate.

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