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Process development and optimisation of lactic acid purification using electrodialysis.

L Madzingaidzo¹, H Danner, R Braun

¹Department of Environmental Biotechnology, Institute for Agro-biotechnology (IFA-Tulln), Konrad Lorenz Strasse 20, A-3430, Tulln, Austria.

Journal of Biotechnology

|June 5, 2002

Summary

Electrodialysis effectively purifies sodium lactate solutions, concentrating lactate to 16% while reducing impurities like glucose. This method offers efficient purification for lactate production.

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Area of Science:

Chemical Engineering
Separation Processes

Background:

Sodium lactate purification is crucial for various industrial applications.
Existing purification methods may have limitations in efficiency and impurity removal.

Purpose of the Study:

To investigate the efficacy of mono- and bi-polar electrodialysis for purifying cell-free sodium lactate solutions.
To optimize electrodialysis parameters for high lactate concentration and purity.

Main Methods:

Purification of sodium lactate solutions using mono-polar electrodialysis.
Further purification of concentrated sodium lactate using bi-polar electrodialysis.
Optimization of feed concentration, current mode, and conductivity setpoints.

Main Results:

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Mono-polar electrodialysis achieved up to 15% lactate concentration with high current efficiency (90%) and low energy consumption (0.6 kWh/kg).
Bi-polar electrodialysis further concentrated lactate to 16% with efficient water transport and energy consumption (0.6-1 kWh/kg).
Glucose was reduced to <1 g/L, and color/minerals were significantly reduced in product streams.

Conclusions:

Mono- and bi-polar electrodialysis are effective methods for purifying sodium lactate solutions.
The optimized electrodialysis process yields high-purity lactate with reduced impurities and significant color/mineral reduction.