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Colour-Value Based Method for Polydopamine Coating-Stability Characterization on Polyethersulfone Membranes.

Thomas Bucher¹, Juliana I Clodt², Andrej Grabowski³

¹Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Str.1, 21502 Geesthacht, Germany. thomas.bucher@hzg.de.

|December 21, 2017

Summary

Researchers developed a temperature correction factor for porous polyethersulfone membranes used in winemaking. A polydopamine coating improved membrane performance and resistance to cleaning agents, enhancing wine production processes.

Keywords:

coating microfiltration polydopamine polyethersulfone membranes stability temperature dependent fluxes ultrafiltration

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Area of Science:

Membrane science and technology
Oenology and wine production
Materials science and engineering

Background:

Porous polyethersulfone (PES) membranes are crucial in oenology for filtration.
Temperature variations can affect membrane performance, impacting filtration efficiency.
Membrane fouling remains a significant challenge in wine filtration processes.

Purpose of the Study:

To evaluate temperature-dependent permeances of porous polyethersulfone membranes in oenology.
To develop a temperature correction factor for accurate and comparable membrane performance data.
To investigate the efficacy of a polydopamine coating in reducing fouling and enhancing membrane performance.

Main Methods:

Investigated temperature-dependent permeances of PES membranes from 10 to 35 °C.
Determined a temperature correction factor for PES membranes.
Coated PES membranes with polydopamine and evaluated performance under cross-flow conditions.
Assessed the chemical stability of the polydopamine coating using acidic and basic cleaning agents.

Main Results:

A temperature correction factor was successfully determined for the investigated membranes.
Polydopamine coating significantly improved membrane permeance and flux recovery.
The coated membranes demonstrated good stability when treated with industrial cleaning agents.
Colorimetric analysis confirmed the chemical stability of the coating under varying pH conditions.

Conclusions:

The developed temperature correction factor enables accurate comparison of membrane performance across different temperatures.
Polydopamine coating is a promising strategy to mitigate fouling and enhance the operational efficiency of PES membranes in oenology.
The coated membranes exhibit robust chemical stability, ensuring their suitability for industrial cleaning protocols in wine production.