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Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

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Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing

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Membrane Flash Index: Powerful and Perspicuous Help for Efficient Separation System Design.

Andras Jozsef Toth^1,2, Botond Szilagyi¹, Daniel Fozer¹

¹Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, HU 1111 Budapest , Hungary.

|July 9, 2020

Summary

This summary is machine-generated.

The novel Membrane Flash Index (MFLI) quantifies pervaporation membrane efficiency against distillation. This index aids process design by identifying optimal liquid separation methods and membranes.

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Area of Science:

Chemical Engineering
Separation Processes
Membrane Technology

Background:

Pervaporation membrane performance is assessed by various indices, but none directly compare efficiency to distillation.
Selecting the optimal liquid separation technology requires a comparative metric.

Purpose of the Study:

To comprehensively evaluate the Membrane Flash Index (MFLI) for pervaporation processes.
To investigate the relationship between MFLI and other key separation parameters.
To demonstrate MFLI's utility in process design for selecting separation alternatives and membranes.

Main Methods:

The study evaluated MFLI across six aqueous mixtures using pervaporation.
Key performance indicators including separation factor, permeation flux, selectivity, and Pervaporation Separation Index (PSI) were analyzed.
Correlations between MFLI, feed concentration, PSI, and separation factor were investigated for specific membrane types.

Main Results:

The Membrane Flash Index (MFLI) is introduced as a novel metric to compare pervaporation membranes with distillation.
Organophilic membranes showed significantly lower separation capacity than hydrophilic membranes.
Descriptive functions were established relating feed concentration to MFLI and PSI to separation factor for consistent membrane materials.

Conclusions:

MFLI provides a quantitative comparison of pervaporation membranes to distillation, aiding process design.
The study highlights differences in separation capacity between organophilic and hydrophilic membranes.
Established relationships between indices allow for predictive calculations, assisting engineers in selecting appropriate membranes and separation strategies.