Pervapertion Overview

Topics: Distillation, Separation process, Chemical engineering Pages: 6 (731 words) Published: December 5, 2013
PERVAPORATION
MT5009 Analyzing Hi-Tech Opportunities
Semester 2, 2011/2012

See Siew Hui
Too Kim Hui
Hubert Giam
Chua Wei Sun
Damien Poh Weiye
Linda Wibisono

A0077625X
A0077025J
A0082070R
A0082022X
A0076856M
A0077098N

Overview
1) Intro
 Distillation and its disadvantage
 What is pervaporation?
 Applications of pervaporation
2) Pervaporation Performance Parameters
 Selectivity
 Flux
 Membrane Thickness
 Temperature
 Kinetic diameter
3) Improvements
4) Hybrid Process (Distillation and Pervaporation)
5) Potential Business Opportunities

Drawbacks of the Existing Method (Distillation)
 Distillation is a conventional liquid mixture separation technology based on their boiling points.

 Disadvantages of distillation
 Difficult to separate liquids mixtures which the components have similar boiling point (azeotropes).

 Advance in technology - Pervaporation can be used for breaking azeotropes.

Pervaporation
 Pervaporation is the separation of liquid mixtures by partial vaporization through a membrane.

Key component in
Pervaporation

membrane

Feed

Major Advantage of Pervaporation
Distillation has major disadvantage compared to the new method of Pervaporation. Distillation is a very energy consuming process (heating process).

Source: Trends in Research and Development of Nanoporous Ceramic Separation Membranes, 2009

Applications of Pervaporation
 Applications include:
 Environmental application: Removing organic solvents from industrial waste waters.

 Pollution control: Removal of small quantities of VOCs (Volatile organic compounds) from contaminated water

 Chemical Industry: removal of water from organic solvents and solvents mixtures – to obtain pure organic solvents

 Pervaporation is a very mild process and hence very effective for separation of those mixtures which can not survive the harsh conditions of distillation.

Overview
1) Intro
 Distillation and its disadvantage
 What is pervaporation?
 Applications of pervaporation
2) Pervaporation Performance Parameters
 Selectivity
 Flux
 Membrane Thickness
 Temperature
 Kinetic diameter
3) Improvements
4) Hybrid Process (Distillation and Pervaporation)
5) Potential Business Opportunities

Measured Performance Parameters
Some of the most important parameters used to assess the pervaporation process are: 1.

Membrane selectivity : what goes through and what gets rejected

2.

Flux: Denote the amount of output (measured in relation to membrane area , thickness and time).

What will influence the performance?
1.

Feed temperature: Refers to temperature of the feed stock or any other representative between feed and retentate streams.

2.

Membrane thickness: Refers to dry thickness.

3.

Kinetic diameter: diameter of pore needed to let a specific molecule pass

Performance Parameters - Selectivity
 Membrane selectivity allows us to choose certain
molecules to pass through the membrane
 Improved membrane selectivity will increase absorption
rates
 more efficient and possible cost reduction
 This can be achieved by better understanding of the
material selected for the membrane

Impact of Feed Temperature on Flux
 Feed Temperature
 Molecules movement increases exponentially with temperature  improve flux rate

Impact of Membrane Thickness on Flux

The thinner the
membrane, the faster
the flux

Influencing Parameters – Kinetic Diameter (1)
Kinetic diameter can be understood as the diameter of a pore needed to let that specific molecule pass

Source: Fundamentals and applications of pervaporation through Zeolite membranes, 2004

Influencing Parameters – Kinetic Diameter (2)

Source: Fundamentals and applications of pervaporation through Zeolite membranes, 2004

Overview
1) Intro
 Distillation and its disadvantage
 What is pervaporation?
 Applications of pervaporation
2) Pervaporation Performance...
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