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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

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Published on: August 10, 2016

Membrane separations for solid-liquid clarification within lignocellulosic biorefining processes.

Jennifer Leberknight¹, Todd J Menkhaus

¹Dept. of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD, 57701.

Biotechnology Progress

|July 2, 2013

Summary

This summary is machine-generated.

Selecting the right membrane material is key to reducing fouling in biorefineries. Optimal membranes for biomass hydrolysate clarification exhibit higher surface roughness, lower hydrophobicity, and neutral or positive charge for better performance.

Keywords:

biomass biorefinery clarification lignin microfiltration

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Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids from Fermentation Broth Using Hollow-Fiber Membranes

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Area of Science:

Biorefining
Membrane Science
Separation Technology

Background:

Membrane separations offer potential for water and energy savings in biorefineries.
Severe membrane fouling currently limits the widespread application of these technologies.
Biomass hydrolysate clarification is a critical step requiring efficient separation methods.

Purpose of the Study:

To establish a framework for selecting optimal membranes for solid-liquid clarification of biomass hydrolysate.
To correlate specific membrane properties with performance metrics to mitigate fouling.
To identify key membrane characteristics that enhance stability and separation efficiency.

Main Methods:

Evaluation of five distinct membrane materials (polyether sulfone, mixed cellulose esters, and three functionalized membranes).
Application of analytical characterizations and fouling models to assess membrane performance.
Correlation analysis between membrane properties (surface roughness, hydrophobicity, zeta potential, pore size) and key performance indicators (flux, fouling, separation factor).

Main Results:

Lignin was identified as the primary foulant, causing flux decline through physical entrapment and chemical adsorption.
Membranes with higher surface roughness, lower hydrophobicity, neutral/positive zeta potential, and smaller pores demonstrated superior performance.
Optimal membrane characteristics were linked to sustained high flux, reduced fouling, and high separation factors.

Conclusions:

The study provides a valuable framework for selecting membranes in biorefining applications.
Understanding the relationship between membrane properties and fouling is crucial for designing more stable and efficient separation materials.
These findings can guide the development of advanced membrane materials to improve biorefinery processes and reduce operational costs.