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Preparation method of hollow fiber membrane for removing carbon dioxide from natural gas

A carbon dioxide and fiber membrane technology, applied in chemical instruments and methods, membrane technology, gas fuel, etc., can solve the problems of poor permeation and separation performance of polymer membranes, achieve good industrial practicability, simple preparation method, and improve permeation selection performance effect

Inactive Publication Date: 2020-05-01
CNOOC ENERGY SAVING & ENVIRONMENTAL PROTECTION SERVICES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of poor permeation and separation performance of polymer membranes in the prior art, the present invention provides a method for preparing a hollow fiber membrane for removing carbon dioxide from natural gas, comprising:

Method used

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  • Preparation method of hollow fiber membrane for removing carbon dioxide from natural gas
  • Preparation method of hollow fiber membrane for removing carbon dioxide from natural gas

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preparation example Construction

[0021] see figure 1 The method for preparing a hollow fiber membrane for removing carbon dioxide from natural gas provided by the embodiment of the present invention uses MOF (Metal-Organic Framework, metal-organic framework) as a dispersed phase to prepare a mixed-matrix hollow fiber membrane, which specifically includes the following steps:

[0022] Step S101, using solvothermal synthesis to prepare MOF particles, and pretreating and activating them under vacuum at a temperature of 140-300° C., and the pretreatment time is 8-24 hours.

[0023] In a specific application, the MOF particle is UiO-66-NH 2 , which is synthesized by the following solvothermal method: zirconium salt and 2-aminoterephthalic acid are dissolved in an organic solvent by ultrasonic and magnetic stirring in a preset ratio to obtain a light yellow solution; In a PTFE-lined high-pressure reactor, heat at high temperature for a certain period of time, cool and centrifuge to obtain yellow crystals, wash wit...

Embodiment 1-4

[0036] Chromium chloride and 2-aminoterephthalic acid (with a molar ratio of 1:1) were dissolved in N,N-dimethylformamide by ultrasonic and magnetic stirring to obtain a light yellow solution. Then transfer it to a high-pressure reaction kettle with PTFE lining, heat at a high temperature of 100-200°C for 8-96 hours, cool and centrifuge to obtain yellow crystals, wash with N,N-dimethylformamide, and then Purified by reflux in methanol, and finally dried in vacuum at a temperature of 70-150°C to obtain UiO-66-NH 2crystals. Vacuum activated UiO-66-NH at 200°C 2 The crystal is evenly dispersed in NMP by stirring and ultrasonic, and then part of the polyetherimide Add the solution prepared by 1000 / NMP into the dispersion liquid in batches, stir and ultrasonically mix evenly, and finally add the remaining required 1000. The concentration of 1000 is 32wt%, UiO-66-NH 2 The concentration in the total solid mass was 5%, and stirred for 12 hours to obtain a uniformly mixed spinn...

Embodiment 5

[0043] Chromium chloride and 2-aminoterephthalic acid (with a molar ratio of 0.5:1) were dissolved in N,N-dimethylformamide by ultrasonic and magnetic stirring to obtain a light yellow solution. Then transfer it to a high-pressure reactor with PTFE lining, heat at a high temperature of 100-200°C for 8-96 hours, cool and centrifuge to obtain yellow crystals, wash with N,N-dimethylformamide, and then Purified by reflux in methanol, and finally dried in vacuum at a temperature of 70-150°C to obtain UiO-66-NH 2 crystals. Vacuum activated UiO-66-NH at 200°C 2 The crystals are uniformly dispersed in NMP by means of stirring and ultrasonication, and then part of the polysulfone / DMF solution is added to the dispersion liquid in batches, mixed evenly by stirring and ultrasonication, and finally the remaining required polysulfone is added. The concentration of polysulfone is 30wt%, UiO-66-NH 2 accounted for 10% of the total solid mass, and stirred for 12 hours to obtain a uniformly m...

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Abstract

The invention discloses a preparation method of a hollow fiber membrane for removing carbon dioxide from natural gas, belonging to the technical field of gas separation membranes. The method comprisesthe following steps: dissolving MOF particles and a high polymer material in a polar organic solvent to prepare a uniformly mixed spinning solution; filtering the spinning solution, carrying out vacuum defoaming treatment, and performing standing at a spinning temperature; spinning the spinning solution by adopting a dry-wet phase inversion method to prepare a mixed matrix hollow fiber membrane;and drying the hollow fiber membrane by adopting a solvent replacement method, and coating the outer surface of the hollow fiber membrane with a silicone rubber layer. According to the invention, theMOF particles are added into the high polymer material; due to the fact that the MOF particles can provide a high specific surface area and a micropore structure, the gas permeability and separation selectivity of the hollow fiber membrane are improved and the permeation selectivity of the hollow fiber membrane is effectively improved through introduction of the MOF particles; and the preparationmethod is simple in process, easy to operate and good in industrial practicability.

Description

technical field [0001] The invention relates to the technical field of gas separation membranes, in particular to a preparation method of a hollow fiber membrane used for removing carbon dioxide from natural gas. Background technique [0002] Natural gas is a mixed gas mainly composed of hydrocarbon gases, usually containing non-hydrocarbon pure gases such as carbon dioxide. The presence of carbon dioxide will lead to corrosion of equipment and pipelines, and the high content of carbon dioxide will cause the calorific value of natural gas to fail to meet the requirements. Therefore, it is necessary to remove carbon dioxide from natural gas. CO2 removal from natural gas 2 The technology is a membrane separation technology with a selective separation polymer membrane as the core. [0003] Polymer membranes are widely used in O 2 / N 2 , CO 2 / CH 4 , CO 2 / N 2 , Separation of olefins / alkanes and other systems. However, limited by the material of the polymer itself, the...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/08B01D69/02B01D67/00C10L3/10
CPCB01D67/0002B01D69/02B01D69/08B01D71/06C10L3/104C10L2290/548
Inventor 闫肃朱文介兴明曹义鸣王钊杨丽丽李平赵国亮孙舫
Owner CNOOC ENERGY SAVING & ENVIRONMENTAL PROTECTION SERVICES
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