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Improvement of cold flow properties of rice bran oil biodiesel |
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DOI: |
KeyWord:rice bran oil biodiesel cold flow property petroleum diesel fatty acid |
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Abstract: |
Cold flow properties of rice bran oil biodiesel were improved by changing composition using three methods, such as adding rapeseed oil to rice bran oil, adding branched chain alcohols to methanol, and adding petroleum diesel to rice bran oil. The results showed that the three methods all could effectively improve cold flow properties of biodiesel. After adding rapeseed oil to rice bran oil, the fatty acid composition of biodiesel was changed, content of saturated fatty acid methyl esters lowered and methyl linolenate content increased, which improved cold flow properties of biodiesel. Especially, cold flow properties of biodiesel were the best when dosage of rapeseed oil was 30%. After adding branched chain alcohols to methanol, methyl palmitate content lowered sharply and branched chain esters content was low, which improved cold flow properties of biodiesel. After adding petroleum diesel to rice bran oil, yield of blend fuels reduced and cold flow properties of biodiesel were improved. Cold filter plugging points of blend fuels lowered to -19?℃ when 70% diesel from direct coal liquefaction was added to rice bran oil. |
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