Simultaneous optimization of glycerol and sulfur content in biodiesel prepared from waste cooking oil
In order to improve the quality of biodiesel prepared from waste cooking oil and reduce its glycerol and sulfur content,the deglycerol effects of centrifugation,standing,water washing-rotary evaporation,as well as the desulfurization effects of oxidation and adsorption(using activated carbon as adsorbent)were analyzed,and the glycerol and sulfur content were synchronously optimized.The results showed that among the three methods of glycerol removal,water washing-rotary evaporation had the best effect.Oxidative desulfurization could lead to the loss of biodiesel while removing sulfides,and reduce the oxidation stability of biodiesel.Compared with standing and ultrasonic oxidation desulfurization,stirring oxidation desulfurization had a better effect,and the desulfurization rate and biodiesel loss rate were 28.5％and 2.0％,respectively.When the amount of activated carbon was 2％,the desulfurization rate was relatively high,reaching 23.8％.Water washing-rotary evaporation could effectively remove both glycerol and sulfur simultaneously.The contents of sulfur,monoglyceride,free glycerol,total glycerol in the removed biodiesel were 9.31 mg/kg,0.182％,0.008％and 0.054％,respectively,and the removal rates were 11.9％,64.3％,78.9％and 68.4％,respectively,which met the requirements of BD100 biodiesel standard in GB 25199-2017 appendix C.Therefore,in actual production,the water washing-rotary evaporation method can be used to simultaneously remove glycerol and sulfur from biodiesel.
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