Título
Three compartment bipolar membrane electrodialysis of sodium formate
Autor
JESUS SALVADOR JAIME FERRER
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
Bipolar membrane electrodialysis is used in three compartment configuration to regenerate formic acid and sodium hydroxide from sodium formate. The preceding study [7] showed that diffusion of molecular formic acid is responsible of the loss of acid current efficiency. The present study shows the following results: the diffusion of molecular formic acid through the bipolar membrane explains quantitatively the presence of sodium formate in the sodium hydroxide solution. The loss of acid current efficiency is due to diffusion of molecular acid through both anion exchange and bipolar membranes. The sodium hydroxide current efficiency is determined by acid diffusion through the bipolar membrane and OH- leakage through the cation exchange membrane. The flux of acid diffusion in the membranes is proportional to acid concentration. The transfer coefficients vary with the temperature.
A model based on mass balance is proposed to describe the electrodialysis. Some experimental parameters like volume variations are needed. It is seen that, following the model, a low temperature is favourable to the process. So does an increase of current density. The nature of anion exchange membrane also affects diffusion. It is found that PC acid 100 membrane is the less permeable to formic acid among 5 tested membranes. The flux of hydroxide ion through the CMB cation exchange membrane is evaluated.
Fecha de publicación
2013
Tipo de publicación
Artículo
Versión de la publicación
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application/pdf
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Repositorio Orígen
Repositorio Institucional CIATEC
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