Method for preparing biodiesel
A biodiesel and seed technology, applied in renewable energy and green fields, can solve the problems of high price of vegetable oil, little research, high cost, etc., to simplify the process, promote rapid progress, and improve production efficiency.
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[0018] Example 1
[0019] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether:ethanol weight ratio is 80:20), then add 2.5g of concentrated sulfuric acid, carry out oil leaching and transesterification reaction at 50℃, and the reflux reaction time continues After 3 hours, stand still and separate to obtain fatty acid-rich ethyl ester phase and glycerol-rich phase. The fatty acid ethyl ester-rich phase is distilled to obtain fatty acid ethyl ester (ie biodiesel) and mixed solvent. The glycerol-rich phase is distilled to obtain glycerol and a mixed solvent, and the obtained mixed solvent can be reused. The residual oil rate is 1.68wt%.
[0020] The prepared biodiesel product was analyzed by GCMS (chromatographic column TR5MS, 30m×0.25mm×0.25μm), and the content of fatty acid ethyl ester determined by internal standard method was 88.7%.
Example Embodiment
[0021] Example 2
[0022] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether:ethanol weight ratio is 50:50), then add 2.5g of concentrated sulfuric acid, carry out oil leaching and esterification reaction at 65℃, and the reflux reaction time continues After 3 hours, filter, stand and separate to obtain fatty acid-rich ethyl ester phase and glycerol-rich phase, wherein the fatty acid ethyl ester phase is distilled to obtain fatty acid ethyl ester (ie biodiesel) and mixed solvent. The glycerol-rich phase is distilled to obtain glycerol and a mixed solvent, and the obtained mixed solvent can be reused. The residual oil rate is 1.25wt%.
[0023] The prepared biodiesel product was analyzed by GCMS, and the content of fatty acid ethyl ester determined by the internal standard method was 91.9%.
Example Embodiment
[0024] Example 3
[0025] Put 25g of soybean flakes in a container, then add 80g of mixed solvent (petroleum ether:ethanol weight ratio is 50:50), then add 2.5g of concentrated sulfuric acid, and carry out oil leaching and esterification reaction at 80℃, and the reflux reaction time continues After 3 hours, filter, stand and separate to obtain fatty acid-rich ethyl ester phase and glycerol-rich phase, wherein the fatty acid ethyl ester phase is distilled to obtain fatty acid ethyl ester (ie biodiesel) and mixed solvent. The glycerol-rich phase is distilled to obtain glycerol and a mixed solvent, and the obtained mixed solvent can be reused. The residual oil rate is 1.28wt%.
[0026] The prepared biodiesel product was analyzed by GCMS, and the content of fatty acid ethyl ester determined by the internal standard method was 94.2%.
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