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Preparation method of Pebax/NH2-MIL-101 mixed-matrix membrane

A mixed matrix membrane, amino terephthalic acid technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problem of not being able to have high permeability and high selectivity at the same time, and achieve excellent separation performance and good economy. Sexual, low-cost effects

Inactive Publication Date: 2020-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer membrane materials often cannot have high permeability and high selectivity at the same time due to their own characteristics, and this feature is called the Robeson upper limit.

Method used

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  • Preparation method of Pebax/NH2-MIL-101 mixed-matrix membrane
  • Preparation method of Pebax/NH2-MIL-101 mixed-matrix membrane

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] Test with single gas, CO 2 And N 2 Both are 99.99% pure gas:

[0022] Will CO 2 The inlet pressure is set to 0.2mPa, and the operating temperature is set to 20°C.

[0023] The Pebax / NH prepared in the present invention 2 -MIL-101 (MIL-101 content accounts for 5% of Pebax matrix) membrane material is installed in the membrane tank flange, the upstream of the membrane tank flange is connected to the inlet side, the downstream is the permeate side, and the tail is connected to the soap bubble flowmeter. To test the gas flow at the permeation end, the effective test area of ​​the membrane cell is 8.55cm 2 . After the operating temperature reaches a stable level, the gas is allowed to flow into the membrane cell and stand for a period of time to stabilize the entire permeation behavior. After the system is stable, test the flow rate of the outflowing gas through a stopwatch and a soap bubble flow meter, and repeat 20 times. N 2 Test with CO 2 Same, calculated the permeability a...

Embodiment 1

[0024] Under the conditions of Example 1, Pebax / NH prepared by the method of the present invention 2 -MIL-101 mixed matrix membrane, under the conditions of this example, CO 2 Permeability is 80.5barrer, N 2 Permeability is 1.48barrer, CO 2 / N 2 The selectivity is 54.3.

[0025] In Example 1, a stabilizing valve was used to control the upstream inlet pressure of the membrane tank flange to stabilize.

[0026] In Example 1, the operating temperature was lowered to -20°C to obtain the low-temperature performance of the mixed matrix membrane, CO 2 Permeability is 30.2barrer, N 2 Permeability is 0.32barrer, CO 2 / N 2 The selectivity is 95.6.

[0027] From this specific example, it can be concluded that: Pebax / NH prepared by the present invention 2 -MIL-101 mixed matrix film can get good CO under normal temperature and low temperature environment 2 / N 2 Separation effect, especially excellent CO can be obtained at low temperature 2 / N 2 The selectivity allows the raw materials to be effect...

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Abstract

The invention designs a mixed-matrix membrane based on block polyether amide and an amino modified chromium metal coordinated framework material and a preparation method thereof. Based on amination modification of a chromium atom MIL-101 which is a metal framework material, the modified framework material is mixed with a polyether block amide material that is Pebax-1657, and the mixed-matrix membrane with uniform form and high CO2 separation performance is prepared through a solution evaporation method. The preparation method comprises the following steps: dissolving the polymer matrix into anorganic solvent that is N-methyl pyrrolidone (NMP) to form a polymer solution, adding the amino-modified MIL-101 in a proper ratio into the solution to form a suspension of an organic polymer and aninorganic filler, stirring for a certain period of time, then performing ultrasonic treatment to further improve the dispersity of the filler, then putting the suspension into a culture dish, coolingto room temperature, and curing to form the membrane. The Pebax / NH2-MIL-101 mixed-matrix membrane prepared by the method disclosed by the invention has relatively good CO2 / N2 separation performance atroom temperature or low temperature.

Description

Technical field [0001] The invention belongs to the preparation technology of organic / inorganic hybrid membrane materials, and relates to a mixed matrix membrane of block polyetheramide and amino-modified chromium metal coordination framework material and a preparation method thereof. Background technique [0002] Membrane separation technology has gradually attracted the attention of a large number of researchers in recent years due to its advantages of low energy consumption, easy expansion, and high efficiency. However, due to its own characteristics, polymer membrane materials often cannot have both high permeability and high selectivity at the same time, and this characteristic is called the Robeson upper limit. The mixed matrix membrane has the advantages of both dispersed filler and continuous polymer, and is a feasible solution to improve the problem that high selectivity and high permeability cannot be obtained at the same time. The metal ligand organic framework materi...

Claims

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Application Information

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IPC IPC(8): B01D71/76B01D71/02B01D71/56B01D69/02B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D69/02B01D71/02B01D71/56B01D71/76B01D2325/12Y02C20/40
Inventor 宋春风范智超李润邱依婷
Owner TIANJIN UNIV
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