STT zeolite molecular sieve membrane module packaging device and method for extracting helium from natural gas

Abstract

The invention belongs to the technical field of membrane materials, and particularly relates to an STT zeolite molecular sieve membrane assembly packaging device and method for extracting helium from natural gas. The packaging device comprises a shell, an end sealing pore plate is connected into the shell, one side of the end sealing pore plate is connected with an outer protection shell, the end, away from the end sealing pore plate, of the outer protection shell is open, and a plurality of hollow fiber STT zeolite molecular sieve membrane elements are arranged in the outer protection shell. The other ends of the hollow fiber STT zeolite molecular sieve membrane elements are filled with end sealing materials; the end sealing pore plate and the plurality of hollow fiber STT zeolite molecular sieve membrane elements are filled with sealing and fixing materials; a fluid feeding hole, a fluid retentate side outlet and a fluid permeation side outlet are formed in the side wall of the shell. According to the STT zeolite molecular sieve membrane assembly packaging device and method for extracting helium from natural gas, the packing density and the shock strength are both achieved, and the problems of arrangement and sealing of zeolite molecular sieve membranes are solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of film materials, and particularly relates to a STT zeolite molecular sieve film assembly packaging device and method for helium extraction from natural gas. BACKGROUND

[0002] Helium is a rare gas with unique physical and chemical properties, and is widely used in magnetic resonance imaging, pressure washing, welding and semiconductor fields. Natural gas is the main source of commercial helium, and it is generally believed internationally that helium with a concentration of more than 0.3% has commercial exploitation value. However, the helium content in most of the natural gas in the world is less than 0.01%, which is difficult to exploit and has high cost. At present, the mainstream technology for helium extraction from natural gas is cryogenic and adsorption, but the cryogenic rectification process involves phase change and has high energy consumption. Membrane separation is a new type of separation unit operation, and compared with traditional separation processes such as rectification, extraction and adsorption, it has the advantages of low energy consumption, high single-stage separation efficiency, simple equipment and less environmental pollution. Among them, the pervaporation and gas separation based on inorganic zeolite molecular sieve membrane materials have become a research hotspot in the field of membrane separation. Compared with polymer membrane materials, it has good hydrothermal stability, regular microporous structure (pore size <1 nm) and separation mechanism based on adsorption diffusion and molecular sieving, and can realize precise molecular-scale screening under harsh conditions (high temperature, high pressure, corrosive medium, radiation environment, etc.).

[0003] Currently, there are relevant literatures and patents reporting the use of zeolite membranes for helium extraction from natural gas. Zhang et al.

Ref: Helium extraction from natural gas using DD3R zeolite membranes [J]. Chin J Chem Eng, 2022, 49: 122-129.

Efficient separation of N2 and He at low temperature using MFI membranes [J]. AIChE J, 2016, 62(8): 2833-2842.

[0004] Gu et al. [Ref: Efficient scale-up synthesis and hydrogen separation of hollow fiber DD3R zeolite membranes[J]. Journal of Membrane Science, 2021, 636, 119564] reported the large-scale preparation of high-performance hollow fiber DD3R zeolite molecular sieve membranes for gas separation. However, problems such as low membrane module packing density, poor shock resistance, low separation efficiency, and high preparation cost limit the expansion of zeolite molecular sieve membranes in the field of gas separation. Patent CN103349918 provides a method for improving the mechanical strength of ceramic hollow fiber supports, and patents CN105749764 and CN109663506 respectively report methods for preparing integrated multi-strand ceramic hollow fiber supports of circular and regular polygonal shapes. In the "integral synthesis" process of zeolite molecular sieve membrane modules, the overall separation performance suffers from a severe "short-board effect," meaning that the overall performance of the membrane module is greatly affected by the performance of individual membranes. This places higher demands on the synthesis conditions and processes of zeolite molecular sieve membranes. In addition, since both ends of the ceramic hollow fiber support are fixed to the base, the internal stress generated by resonance after being subjected to external force during use cannot be eliminated in time, which can easily cause the connection between the base and the support to break and lose its separation performance. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, the present invention aims to provide an encapsulation device and method for STT zeolite molecular sieve membrane modules for helium extraction from natural gas, which combines packing density and shock resistance, and solves the problems of zeolite molecular sieve membrane arrangement and sealing, thereby promoting the industrial application of STT zeolite molecular sieve membrane modules for helium extraction from natural gas.

[0006] The technical solution adopted in this invention is as follows:

[0007] An encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas includes a housing, an end-sealing orifice plate connected inside the housing, an outer protective shell connected to one side of the end-sealing orifice plate, and an open end of the outer protective shell away from the end-sealing orifice plate. A plurality of hollow fiber STT zeolite molecular sieve membrane elements are disposed inside the outer protective shell, with one end of each hollow fiber STT zeolite molecular sieve membrane element passing through the end-sealing orifice plate and the other end of each hollow fiber STT zeolite molecular sieve membrane element filled with end-sealing material. The end-sealing orifice plate and the plurality of hollow fiber STT zeolite molecular sieve membrane elements are filled with sealing and fixing material. A fluid inlet is provided on the side wall of the housing, a fluid permeation outlet is provided on the open side of the housing near the outer protective shell, and a fluid permeation outlet is provided on the end of the housing near the end-sealing orifice plate.

[0008] During gas separation, the gas mixture enters the membrane module through the fluid inlet. The permeate component passes through the zeolite molecular sieve membrane layer and is removed through the normal pressure (or negative pressure) fluid permeate side outlet, while the residual gas is removed through the fluid residual side outlet.

[0009] The multi-level annular end-sealing plate of this invention not only enhances the mechanical strength at the sealing end but also facilitates a more uniform distribution of the sealing material. The other end of the hollow fiber STT zeolite molecular sieve membrane element is filled with end-sealing material, and the end-sealing plate and several hollow fiber STT zeolite molecular sieve membrane elements are filled with sealing and fixing material. This not only ensures the arrangement of the STT zeolite molecular sieve membrane within the end-sealing plate but also improves the encapsulation success rate. This invention can complete the encapsulation of the hollow fiber STT zeolite molecular sieve membrane element in a static state at room temperature, avoiding the risk of damage to the zeolite molecular sieve membrane caused by high-temperature curing and centrifugal sealing processes. The STT zeolite molecular sieve membrane element encapsulation adopts a "live end-dead end" combined process, solving the problem of unresolved internal stress when both ends are fixed to the base; it proposes a "post-synthesis encapsulation" method for zeolite molecular sieve membrane element encapsulation, improving the overall performance of the membrane element and facilitating modular encapsulation with different filling densities.

[0010] As a preferred embodiment of the present invention, the housing includes a housing cover and a housing body, the housing cover and the housing body are connected by bolts, an end sealing plate is connected between the housing cover and the housing body, a fluid inlet and a fluid permeation side outlet are provided on the housing body, and a permeation side outlet is provided on the housing cover.

[0011] As a preferred embodiment of the present invention, sealing gaskets are provided between the upper cover of the housing and the end sealing plate, and between the end sealing plate and the housing body.

[0012] As a preferred embodiment of the present invention, the upper and lower sides of the end sealing plate are filled with a plurality of hollow fiber STT zeolite molecular sieve membrane elements and are sealed and fixed with a sealing material.

[0013] As a preferred embodiment of the present invention, a plurality of baffles are provided inside the outer protective shell, and the hollow fiber STT zeolite molecular sieve membrane element passes through the baffles.

[0014] As a preferred embodiment of the present invention, the end sealing plate and the outer protective shell are integrally formed.

[0015] As a preferred embodiment of the present invention, the end sealing material and the sealing and fixing material are one of epoxy resin, ceramic sealant and organosilicon, and the sealing and curing temperature is 20 to 120°C.

[0016] As a preferred embodiment of the present invention, the number of hollow fiber STT zeolite molecular sieve membrane elements arranged on the end sealing plate is 1 to 100, and the length of the hollow fiber STT zeolite molecular sieve membrane elements is 50 to 500 mm.

[0017] As a preferred embodiment of the present invention, the diameter of the end sealing orifice plate is 3-120 mm, and the opening ratio is 0-70%.

[0018] A method for encapsulating an STT zeolite molecular sieve membrane module for helium extraction from natural gas includes the following steps:

[0019] S1: Seal and solidify one end of the STT zeolite molecular sieve membrane with a sealing material to form a single zeolite molecular sieve membrane that is only permeable on one side and independently sealed.

[0020] S2: The entire surface of the STT zeolite molecular sieve membrane is treated with ethanol to remove surface impurities and then heated to dry the surface.

[0021] S3: Arrange the STT zeolite molecular sieve membrane in the end-sealing orifice plate, fill the remaining space near the permeation side end face with end-sealing material, and form a semi-fixed STT zeolite molecular sieve membrane element after curing.

[0022] S4: The far-permeation end face of the semi-fixed STT zeolite molecular sieve membrane element is filled with sealing and fixing material, and after curing again, the encapsulated hollow fiber STT zeolite molecular sieve membrane element is obtained.

[0023] S5: The airtightness and high pressure resistance of the hollow fiber STT zeolite molecular sieve membrane element were tested by bubbling method and pressure test method respectively. After passing the test, the hollow fiber STT zeolite molecular sieve membrane element with natural gas helium extraction capability was obtained.

[0024] The beneficial effects of this invention are as follows:

[0025] The multi-level annular end-sealing plate of this invention not only enhances the mechanical strength at the sealing end but also facilitates a more uniform distribution of the sealing material. The other end of the hollow fiber STT zeolite molecular sieve membrane element is filled with end-sealing material, and the end-sealing plate and several hollow fiber STT zeolite molecular sieve membrane elements are filled with sealing and fixing material. This not only ensures the arrangement of the STT zeolite molecular sieve membrane within the end-sealing plate but also improves the encapsulation success rate. This invention can complete the encapsulation of the hollow fiber STT zeolite molecular sieve membrane element in a static state at room temperature, avoiding the risk of damage to the zeolite molecular sieve membrane caused by high-temperature curing and centrifugal sealing processes. The STT zeolite molecular sieve membrane element encapsulation adopts a "live end-dead end" combined process, solving the problem of unresolved internal stress when both ends are fixed to the base; it proposes a "post-synthesis encapsulation" method for zeolite molecular sieve membrane element encapsulation, improving the overall performance of the membrane element and facilitating modular encapsulation with different filling densities. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 The images show SEM images of the surface and cross-section of an STT molecular sieve membrane prepared on a hollow fiber carrier by a secondary growth method.

[0028] Figure 3 This is a schematic diagram of the radial cross-section of a hollow fiber zeolite molecular sieve membrane element;

[0029] Figure 4 This is an axial schematic diagram of a hollow fiber zeolite molecular sieve membrane element;

[0030] Figure 5 This is a graph showing the high-pressure stability test results for nitrogen.

[0031] Figure 6 This is a graph showing how the helium extraction effect changes with pressure.

[0032] In the diagram: 1-Shell cover; 2-Bolt; 3-End sealing plate; 4-Sealing gasket; 5-Hollow fiber STT zeolite molecular sieve membrane element; 6-Outer protective shell; 7-End sealing material; 8-Shell body; 9-Sealing and fixing material; 10-Baffle plate; A-Fluid inlet; B-Fluid permeate side outlet; C-Fluid permeate side outlet. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the invention can be combined with each other.

[0035] like Figures 1-6 As shown, the STT zeolite molecular sieve membrane module encapsulation device for helium extraction from natural gas in this embodiment includes a housing, an end sealing plate 3 connected inside the housing, an outer protective shell 6 connected to one side of the end sealing plate 3, the end sealing plate 3 and the outer protective shell 6 being integrally formed, the end of the outer protective shell 6 away from the end sealing plate 3 being open, a plurality of hollow fiber STT zeolite molecular sieve membrane elements 5 being disposed inside the outer protective shell 6, one end of the hollow fiber STT zeolite molecular sieve membrane element 5 passing through the end sealing plate 3, the other end of the hollow fiber STT zeolite molecular sieve membrane element 5 being filled with end sealing material 7, the end sealing plate 3 and the plurality of hollow fiber STT zeolite molecular sieve membrane elements 5 being filled with sealing and fixing material 9; a fluid inlet A is provided on the side wall of the housing, a fluid permeation side outlet B is provided on a section of the housing near the open side of the outer protective shell 6, and a fluid permeation side outlet C is provided on the end of the housing near the end sealing plate 3.

[0036] During gas separation, the gas mixture enters the membrane module through the fluid inlet A. After the permeate passes through the zeolite molecular sieve membrane layer, it is removed through the normal pressure (or negative pressure) fluid permeate side outlet C, and the residual gas is removed through the fluid residual side outlet B.

[0037] In the field of hollow fiber molecular sieve membrane module fabrication, the currently used integrated support has certain limitations, especially in the fabrication of high-packing-density membrane modules. This is because the support's configuration and arrangement are fixed, and the synthesis effect is affected by the spacing between the supports. This invention proposes a "post-synthesis encapsulation" strategy. By adjusting the spacing of the end-sealing orifice plates 3, not only can the encapsulation regularity of the membrane module be guaranteed, but encapsulation of membrane modules with different packing densities can also be achieved.

[0038] If a hollow fiber molecular sieve membrane assembly is designed with both ends fixed, under this constraint, the maximum bending moment of the hollow fiber molecular sieve membrane usually occurs in the middle, while the maximum stress point will appear near the fixed end. This design makes the molecular sieve membrane prone to fracture near the fixed end when subjected to external forces, thus losing its separation performance. To improve the seismic performance and durability of membrane modules, this invention proposes the following three technical improvements: First, the membrane module adopts a "fixed at one end" "dead end-live end" encapsulation method. This method transfers the displacement and stress generated by the membrane module under external force to the live end, effectively eliminating the internal stress of the hollow fiber molecular sieve membrane at the fixed end and reducing the risk of breakage due to stress concentration. Second, a protective shell with openings is added to the outside of the molecular sieve membrane module. This provides additional protection for the membrane core of the molecular sieve membrane without hindering gas flow, enhancing the overall strength of the membrane module. Finally, the perforated plate set inside the protective shell, in addition to adjusting the packing density and arrangement regularity, can also absorb the displacement generated by the live end under force. This helps to disperse and mitigate the impact of external forces on the membrane module, improving its seismic performance.

[0039] In the design of molecular sieve membrane modules, optimizing the pore plate arrangement can achieve more efficient gas mass transfer. For example... Figure 1 The structure shown allows for the design of membrane modules with different perforation arrangements using the perforated plate arrangement. Computational fluid dynamics (CFD) is then used to simulate the gas mass transfer state under different structures, thereby finding the optimal arrangement. In traditional membrane module encapsulation methods, centrifugation and static sealing are two common techniques. Centrifugation achieves uniform distribution of the encapsulation material through centrifugal force generated by high-speed rotation, but this method requires a dedicated centrifugal sealer, which is costly and complex to operate. In contrast, static sealing allows the encapsulation material to distribute naturally in a static state, but this can lead to uneven distribution and low efficiency. This patent proposes a two-step static sealing encapsulation process. This not only avoids the use of a centrifugal sealer but also ensures a more uniform distribution of the encapsulation material on the membrane module through two static treatment steps, thereby improving the quality and efficiency of the encapsulation.

[0040] Specifically, the housing includes an upper cover 1 and a main body 8, which are connected by bolts 2. An end sealing plate 3 is connected between the upper cover 1 and the main body 8. A fluid inlet A and a fluid permeation outlet B are located on the main body 8, and a permeation outlet is located on the upper cover 1. Sealing gaskets 4 are provided between the upper cover 1 and the end sealing plate 3, and between the end sealing plate 3 and the main body 8.

[0041] The upper and lower sides of the end sealing plate 3 are filled with a number of hollow fiber STT zeolite molecular sieve membrane elements 5 and are filled with sealing and fixing material 9.

[0042] The outer protective shell 6 contains several baffles 10, through which the hollow fiber STT zeolite molecular sieve membrane element 5 passes. The design of the baffles 10 is inspired by the bow-shaped baffles 10 of shell-and-tube heat exchangers. In addition to optimizing the packing density, arrangement regularity, and stress absorption of the membrane module, it can also enhance the turbulence of the gas inside the membrane module.

[0043] The end sealing material 7 and the sealing and fixing material 9 are one of epoxy resin, ceramic sealant and organosilicon, and the sealing and curing temperature is 20 to 120°C.

[0044] The number of hollow fiber STT zeolite molecular sieve membrane elements 5 arranged on the end sealing plate 3 is 1 to 100, and the length of the hollow fiber STT zeolite molecular sieve membrane element 5 is 50 to 500 mm.

[0045] The diameter of the end sealing orifice plate 3 is 3-120mm, and the opening rate is 0-70%.

[0046] The number of the baffles 10 is 0 to 50.

[0047] The number of openings on the side of the outer protective shell 6 ranges from 0 to 500.

[0048] The cover 1 and the main body 8 of the shell are made of stainless steel, polyethylene, or polypropylene; the end sealing plate 3 is made of ceramic, polypropylene, or metal.

[0049] The gases used in the pressure test include, but are not limited to, nitrogen, carbon dioxide, methane, hydrogen, helium, and sulfur hexafluoride.

[0050] Figure 3 This is a schematic diagram of the radial cross-section of a hollow fiber zeolite molecular sieve membrane element: where, Figure 3 (a)~ Figure 3 (d) are schematic diagrams of molecular sieve membrane elements arranged in 21, 28, 34 and 40 configurations, respectively. Figure 4 This is an axial schematic diagram of a hollow fiber zeolite molecular sieve membrane element; where, Figure 4 (a) and Figure 4 (b) are schematic diagrams of hollow fiber zeolite molecular sieve membrane elements with different numbers of side openings, arranged in 21 and 34 arrangements, respectively. Figure 5 To test the stability of the membrane module under high nitrogen pressure at a feed pressure of 4 MPa, the following diagram is provided. Figure 6 The graph shows the effect of membrane module on helium extraction from natural gas simulant (ConHe = 0.125%) as a function of pressure.

[0051] The encapsulation method for the STT zeolite molecular sieve membrane module for helium extraction from natural gas in this embodiment includes the following steps:

[0052] S1: Seal one end of the zeolite molecular sieve membrane with a sealing material and cure it at room temperature for 30 minutes to form a single zeolite molecular sieve membrane that is only permeable on the near-permeable side. Use the bubbling method to check the sealing.

[0053] S2: Immerse the entire surface of the zeolite molecular sieve membrane in a 95wt.% ethanol solution for 30 seconds, then rinse it repeatedly with deionized water 3 times until all surface impurities are removed. Place the zeolite molecular sieve membrane in an 80℃ forced-air drying oven to dry its surface completely.

[0054] S3: The zeolite molecular sieve membrane is placed in the end-sealed orifice plate 3 according to a specific arrangement. The remaining space near the permeation side end face is filled with sealing material. After curing at room temperature for 30 minutes, a semi-fixed pre-formed zeolite molecular sieve membrane element is formed.

[0055] S4: Slowly add a fluid sealing filler material to the far permeation side of the semi-fixed pre-formed zeolite molecular sieve membrane element, and let it stand in an 80℃ forced-air drying oven for 12 hours to complete the degassing and curing process, and obtain the encapsulated zeolite molecular sieve membrane element.

[0056] S5: Install the zeolite molecular sieve membrane element into the adapter housing with sealing gasket 4, and completely fix and seal the top cover, membrane element and housing with bolts 2. Use the bubbling method and pressure test method to test the air tightness and pressure resistance of the membrane module, and make a preliminary judgment on the performance of the module based on the change of gas permeability with test pressure.

[0057] Example 1:

[0058] Eighteen hollow fiber STT zeolite molecular sieve membrane elements 5, each with an outer diameter of 4.2 mm and a length of 400 mm, were selected and encapsulated on an end-sealing plate 3 with an inner diameter of 38 mm and a pore size of 4.3 mm. The membrane elements were then installed into a stainless steel assembly housing with an inner diameter of 40 mm and a length of 420 mm. A cover 1 was installed on the housing and secured with bolts 2, forming a packing density of 180 m³ / s. 2 / m 3 Hollow fiber STT zeolite molecular sieve membrane element 5. The membrane module was subjected to single-component gas permeability tests under helium, nitrogen, and methane. The test results are shown in Table 1. Under a feed pressure of 1.6 MPa, the ideal selectivity of helium / methane was 4, and the ideal selectivity of helium / nitrogen was 4. Under a nitrogen feed pressure of 4 MPa, the membrane module was subjected to high-pressure stability tests, and the results are shown in Table 1. Figure 5 As shown, the nitrogen permeability of the encapsulated membrane module remained essentially unchanged during the 5000-minute test cycle, demonstrating good high-pressure stability.

[0059] Table 1 Performance test results of Example 1

[0060]

[0061]

[0062] Example 2:

[0063] Twenty-one hollow fiber STT zeolite molecular sieve membranes with an outer diameter of 4.2 mm and a length of 350 mm were selected for membrane element encapsulation. The encapsulated membrane elements were then housed in a stainless steel assembly housing with an inner diameter of 40 mm and a length of 420 mm. This membrane assembly was used for simulated natural gas helium extraction (ConHe = 0.125%) performance testing, and the test results are shown in Table 2. Figure 6 As shown. At a feed flow rate of 375 mL / min... -1 Under these conditions, as the feed pressure increases, the helium recovery rate gradually increases, reaching 20% ​​at a pressure of 5 MPa, at which point the helium concentration factor is 10 times.

[0064] Table 2 Performance test results of Example 2

[0065]

[0066]

[0067] This invention is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that falls within the scope of the claims of this invention shall be protected by this invention.

Claims

1. A packaging device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas, characterized in that: The device includes a housing, an end sealing plate (3) connected inside the housing, an outer protective shell (6) connected to one side of the end sealing plate (3), the outer protective shell (6) being open at one end away from the end sealing plate (3), a plurality of hollow fiber STT zeolite molecular sieve membrane elements (5) being disposed inside the outer protective shell (6), one end of the hollow fiber STT zeolite molecular sieve membrane element (5) passing through the end sealing plate (3), the other end of the hollow fiber STT zeolite molecular sieve membrane element (5) being filled with end sealing material (7), and the end sealing plate (3) and the plurality of hollow fiber STT zeolite molecular sieve membrane elements (5) being filled with sealing and fixing material (9); a fluid inlet (A) is provided on the side wall of the housing, a fluid permeation side outlet (B) is provided on a section of the housing near the open side of the outer protective shell (6), and a fluid permeation side outlet (C) is provided on the end of the housing near the end sealing plate (3).

2. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The housing includes a housing cover (1) and a housing body (8). The housing cover (1) and the housing body (8) are connected by bolts (2). An end sealing plate (3) is connected between the housing cover (1) and the housing body (8). A fluid inlet (A) and a fluid permeation side outlet (B) are provided on the housing body (8), and a permeation side outlet is provided on the housing cover (1).

3. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 2, characterized in that: Sealing gaskets (4) are provided between the cover (1) on the shell and the end sealing plate (3), and between the end sealing plate (3) and the shell body (8).

4. The STT zeolite molecular sieve membrane module encapsulation device for helium extraction from natural gas according to claim 1, characterized in that: The upper and lower sides of the end sealing plate (3) are filled with a number of hollow fiber STT zeolite molecular sieve membrane elements (5) and are filled with sealing and fixing material (9).

5. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The outer protective shell (6) is provided with several baffles (10), and the hollow fiber STT zeolite molecular sieve membrane element (5) passes through the baffles (10).

6. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The end sealing plate (3) and the outer protective shell (6) are integrally formed.

7. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The end sealing material (7) and the sealing and fixing material (9) are one of epoxy resin, ceramic sealant and organosilicon, and the sealing and curing temperature is 20 to 120°C.

8. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The number of hollow fiber STT zeolite molecular sieve membrane elements (5) arranged on the end sealing plate (3) is 1 to 100, and the length of the hollow fiber STT zeolite molecular sieve membrane elements (5) is 50 to 500 mm.

9. The encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas according to claim 1, characterized in that: The diameter of the end sealing orifice plate (3) is 3-120 mm, and the opening rate is 0-70%.

10. A method for encapsulating an STT zeolite molecular sieve membrane module for helium extraction from natural gas, using the encapsulation device for an STT zeolite molecular sieve membrane module for helium extraction from natural gas as described in claim 1, characterized in that: Includes the following steps: S1: Seal and solidify one end of the STT zeolite molecular sieve membrane with a sealing material to form a single zeolite molecular sieve membrane that is only permeable on one side and independently sealed. S2: The entire surface of the STT zeolite molecular sieve membrane is treated with ethanol to remove surface impurities and then heated to dry the surface. S3: Arrange the STT zeolite molecular sieve membrane in the end sealing orifice plate (3), fill the remaining space near the permeation side end face with end sealing material (7), and form a semi-fixed STT zeolite molecular sieve membrane element after curing. S4: The far-permeation end face of the semi-fixed STT zeolite molecular sieve membrane element is filled with sealing and fixing material (9), and after curing again, the encapsulated hollow fiber STT zeolite molecular sieve membrane element (5) is obtained. S5: The air tightness and high pressure resistance of the hollow fiber STT zeolite molecular sieve membrane element (5) were tested by bubbling method and pressure test method respectively. After passing the test, the hollow fiber STT zeolite molecular sieve membrane element (5) with natural gas helium extraction capability was obtained.

Images