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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:

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High-Performance Porous Supports Based on Hydroxyl-Terminated Polysulfone and CO2/CO-Selective Composite Membranes.

Dmitry Matveev1, Tatyana Anokhina1, Alisa Raeva1

  • 1A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect, 29, 119991 Moscow, Russia.

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Summary

This study developed advanced thin-film composite membranes for CO2/CO separation by synthesizing novel polysulfone supports. The new membranes exhibit significantly higher gas permeance and selectivity, improving gas processing efficiency.

Keywords:
CO2/CO separationF-containing polysiloxanechemical structurecomposite membranegas separation membranehigh-performance porous supportmolecular weightpolymer synthesispolysulfone

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Area of Science:

  • Materials Science and Engineering
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Carbon dioxide (CO2) and carbon monoxide (CO) mixtures are relevant in gas processing and gasification.
  • Thin-film composite (TFC) membranes are crucial for gas separation, with performance depending on both selective and support layers.
  • Polysulfone (PSF) porous supports are widely used but their properties are influenced by the non-solvent-induced phase separation (NIPS) process and casting solution characteristics.

Purpose of the Study:

  • To develop highly permeable porous polysulfone (PSF) supports for CO2/CO separation TFC membranes.
  • To synthesize novel PSF samples with varying molecular weights and terminal hydroxyl groups to enhance support performance.
  • To evaluate the performance of TFC membranes utilizing these novel supports with different siloxane-based selective layers.

Main Methods:

  • Synthesis of polysulfone (PSF) samples with terminal hydroxyl groups and characterization using NMR, DSC, and TGA.
  • Calculation of Hansen solubility parameters for synthesized PSF samples.
  • Fabrication and testing of thin-film composite (TFC) membranes using synthesized PSF supports and siloxane-based selective layers (50F3 and PDMS).

Main Results:

  • Synthesized PSF with a higher ratio of terminal -OH groups improved solubility in NMP and water, leading to significantly higher CO2 permeance in porous supports (26,700 GPU vs. 4300 GPU for commercial PSF).
  • A direct dependence of porous support gas permeance on the coagulation rate of the casting solution was identified.
  • TFC membranes with novel PSF supports showed 3.5 times higher CO2 permeance than those with commercial PSF supports.
  • Composite membranes with a 50F3 siloxane selective layer exhibited 1.5 times higher CO2/CO selectivity (9.1-9.3) compared to PDMS selective layers.

Conclusions:

  • The synthesis of tailored PSF supports with specific terminal groups and controlled NIPS process parameters can dramatically enhance membrane performance for CO2/CO separation.
  • The F-containing 50F3 polysiloxane is a promising material for the selective layer, offering superior CO2/CO selectivity.
  • The developed TFC membranes represent a significant advancement for efficient gas processing applications.