Deacidification and Esterifaction of Waste Cooking Oil: Comparison of the Coupled Process with Stand- Alone Catalytic Esterification and Extraction Processes

نویسندگان

  • Xianghong Lu
  • Yi Zhang
  • Yunliang Yu
  • Jianbing Ji
چکیده

The free fatty acids in waste oil with high acid value were removed and transformed into fatty acid methyl esters by the extraction-reaction coupled process. The de-acidification efficiency and esterification conversion in the extraction-reaction coupled process were studied and compared with those in the stand-alone extraction process and the esterification process, respectively. Compared with cross-current batch extraction, the de-acidification efficiency of the extraction-reaction coupled process was equivalent to that of seven equilibrium stages in the conditions of the oil/methanol mass ratio of 1:1 at 60 C. Compared with the esterification process, the esterification conversion of the coupled process was 90.3%, which is much larger than 46% in the esterification process at the reaction time of 32 minutes. Based on these findings, it is suggested that the extraction-reaction coupled process is a very effective and promising method for biodiesel production from oils having high acid value.

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تاریخ انتشار 2009