Electronic-grade methane purification device

Abstract

The electronic-grade methane purification device comprises a first adsorber, a second adsorber, a rectifying tower, a condenser, a buffer tank and a product bottle, the first adsorber is provided with a raw material inlet, and the first adsorber is connected in series with the second adsorber through a pipeline; the second adsorber is connected in series with the rectifying tower through a pipeline; the rectifying tower is connected with the product bottle in series; the condenser and the buffer tank are connected in series and then arranged on one side of the rectifying tower and the product bottle in parallel; the liquefied natural gas belonging to a gas mixture is separated by adopting a device combining pressure swing adsorption and low-temperature rectification, namely low-boiling-point organic and inorganic impurities in the liquefied natural gas are sequentially removed by utilizing two stages of adsorbers connected in series, so that some components influencing the rectification efficiency are removed; then the liquefied natural gas subjected to adsorption treatment is subjected to low-temperature rectification, so that high-boiling-point organic impurities are removed, high-purity methane gas is obtained, and the device is low in cost, high in product purity and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of high-purity gas purification related equipment, in particular to an electronic-grade methane purification device. Background Art

[0002] Methane is a hydrocarbon with the chemical formula CH4. It is widely distributed in nature and is the main component of natural gas, biogas, oilfield gas and coal mine gas. It can be used as a gas fuel and a raw material for the production of hydrogen, carbon black, carbon monoxide, acetylene, hydrocyanic acid and formaldehyde. Currently, there are many methods for purifying methane. The most commonly used method is pressure swing adsorption purification. This method uses natural gas as the raw material and passes it through an adsorption bed. The adsorbent is used to adsorb methane on the bed, allowing other gases to flow out, or other gases are adsorbed on the bed, allowing methane to flow out, thereby achieving the purpose of increasing the methane concentration. However, this prior art pressure swing adsorption purification method has the following problems: it is only suitable for situations where the adsorption capacities of the components in the target gas differ significantly. The greater the difference, the easier the separation, the lower the separation cost, and the higher the yield. However, because the adsorption capacities of methane in liquefied natural gas and other gases do not differ significantly, the resulting methane purity can only reach 99.9%, far from meeting the requirements of some applications, thus limiting its scope of application.

[0003] Based on the above situation, an electronic grade methane purification device is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide an electronic grade methane purification device to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an electronic grade methane purification device, comprising a first adsorber, a second adsorber, a distillation tower, a condenser, a buffer tank and a product bottle;

[0006] The first adsorber is provided with a raw material inlet, and the first adsorber is connected in series with the second adsorber via a pipeline;

[0007] The second adsorber is connected in series with the distillation tower via a pipeline;

[0008] The distillation tower is connected in series with the product bottle;

[0009] The condenser and the buffer tank are connected in series and then arranged in parallel on one side of the distillation tower and the product bottle.

[0010] In a preferred embodiment, the filler in the first adsorber is activated carbon.

[0011] In a preferred embodiment, the activated carbon is resin activated carbon.

[0012] In a preferred embodiment, the filling material in the second adsorber is a molecular sieve.

[0013] In a preferred embodiment, the molecular sieves are 3X and 5A molecular sieves.

[0014] Preferably, a reboiler is provided at one side of the bottom of the distillation tower.

[0015] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are:

[0016] The electronic-grade methane purification device of the present application is configured with a first adsorber, a second adsorber, a distillation tower, a condenser, a buffer tank, and a product bottle, and uses a device combining pressure swing adsorption and cryogenic distillation to separate liquefied natural gas from a gas mixture. That is, two-stage series adsorbers are first used to sequentially remove low-boiling-point organic and inorganic impurities therein, thereby removing some components that affect distillation efficiency. The adsorbed liquefied natural gas is then subjected to cryogenic distillation to remove high-boiling-point organic impurities, thereby obtaining methane gas with a purity of 99.9999%. The device has the advantages of simple operation, low cost, high product purity, and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Attachment Figure 1 This is a schematic diagram of the electronic grade methane purification device of the present invention;

[0019] Among them: 1. First adsorber; 2. Second adsorber; 3. Distillation tower; 4. Condenser; 5. Buffer tank; 6. Product bottle; 7. Reboiler. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0023] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Example 1

[0027] Attachment Figure 1 The electronic grade methane purification device of the present invention comprises a first adsorber 1, a second adsorber 2, a distillation tower 3, a condenser 4, a buffer tank 5 and a product bottle 6;

[0028] The first adsorber 1 is provided with a raw material inlet, and the first adsorber 1 is connected in series with the second adsorber 2 through a pipeline; the first adsorber 1 is filled with activated carbon, such as resin activated carbon;

[0029] The second adsorber 2 is connected in series with the distillation tower 3 via a pipeline; the filling material in the second adsorber 2 is a molecular sieve, such as 3X and 5A molecular sieves;

[0030] The distillation tower 3 is connected in series with the product bottle 6;

[0031] The condenser 4 is connected in series with the buffer tank 5 and then arranged in parallel on one side of the distillation tower 3 and the product bottle 6 .

[0032] In order to better promote the removal of impurities in the distillation tower 3 , a reboiler 7 is provided at one side of the bottom of the distillation tower 3 .

[0033] In specific use, liquefied natural gas (LNG) with a methane concentration of about 75% is used as raw material. It is first made to flow into a first-stage adsorption device filled with activated carbon through a raw material inlet, mainly to remove H2S and low-boiling-point organic components such as C3 and above in the LNG; then the above-mentioned liquefied natural gas after passing through the first-stage adsorption device flows into a second-stage adsorption device filled with a molecular sieve, mainly to remove CO2 and H2O in the LNG; thereafter, the above-mentioned liquefied natural gas after passing through the second-stage adsorption device flows into a distillation tower 3 with a gauge pressure of 5 bar and a temperature below -170°C, and the liquefied natural gas after passing through the second-stage adsorption device is subjected to low-temperature distillation in the distillation tower 3 to remove high-boiling-point impurities such as N2 and C2H6. Finally, CH4 is collected and filled into a product bottle 6 to obtain methane gas with a purity of 99.9999%.

[0034] The electronic-grade methane purification device of the present application is provided with a first adsorber 1, a second adsorber 2, a distillation tower 3, a condenser 4, a buffer tank 5 and a product bottle 6, and uses a device combining pressure swing adsorption and cryogenic distillation to separate liquefied natural gas from a gas mixture. That is, two-stage series adsorbers are first used to sequentially remove low-boiling-point organic and inorganic impurities therein, thereby removing some components that affect distillation efficiency. The adsorbed liquefied natural gas is then subjected to cryogenic distillation to remove high-boiling-point organic impurities, thereby obtaining methane gas with a purity of 99.9999%. The device has the advantages of simple operation, low cost, high product purity, and a wide range of applications.

[0035] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electronic grade methane purification device, characterized by: It includes a first adsorber, a second adsorber, a distillation tower, a condenser, a buffer tank and a product bottle; The first adsorber is provided with a raw material inlet, and the first adsorber is connected in series with the second adsorber via a pipeline; The second adsorber is connected in series with the distillation tower via a pipeline; The distillation tower is connected in series with the product bottle; The condenser and the buffer tank are connected in series and then arranged in parallel on one side of the distillation tower and the product bottle.

2. The electronic grade methane purification device according to claim 1, characterized in that: The filler in the first adsorber is activated carbon.

3. The electronic grade methane purification device according to claim 2, characterized in that: The activated carbon is resin activated carbon.

4. The electronic grade methane purification device according to claim 1, characterized in that: The filling material in the second adsorber is molecular sieve.

5. The electronic grade methane purification device according to claim 4, characterized in that: The molecular sieves are 3X and 5A molecular sieves.

6. The electronic grade methane purification device according to claim 1, characterized in that: A reboiler is provided at one side of the bottom of the distillation tower.

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