Use of Current and Potential Fluctuations Among Identical Electrodes to Determine the Induction Time of the Transesterification Reaction

作者：Castillo Atoche A^*; Vega Lizama E T; Maldonado Lopez L; Castro Borges P; Diaz Ballote L

来源：International Journal of Electrochemical Science, 2014, 9(1): 249-256.

• Electrochemical noise
• Transesterification
• Biodiesel
• Induction time
• Electrochemical sensor

Fluctuations of potential and current generated among identical electrodes (electrochemical noise, EN) immersed in the reaction mixture of a transesterification process were used to determine the time period of the mass transfer controlled stage. The alcohol type (methanol or ethanol), and agitation speed (200, 400, and 600 rpm) were used to illustrate the potential application of EN in biodiesel development. EN has shown to be particularly valuable for determining the induction time of the transesterification reaction which is known as a stage of mass transfer control. Thin layer chromatography and thermogravimetric analysis were used to determine the chemical composition of the reaction mixture before and after the mass transfer controlled region. These results were correlated with electrochemical noise. It was demonstrated that current and potential fluctuations provide a relatively easy way to measure the elapsed time of the initial stage of mass transfer control during the transesterification process. Therefore current and potential fluctuations are a valuable tool for novel experiments during the early stages of transesterification.

• 出版日期2014-1