《Table 5 Effects of different oils&fats and fatty acid methyl esters on the composition of bio-light

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《Study on Co-refining of Poplar Powder with Soybean Oil in Supercritical Methanol》

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Note:Reaction conditions:40.0 g of P2，100.0 g of methanol，80.0 g of oils&fats or fatty acid methyl esters took part in the reaction at a temperature of 320°C for 1.0 h.

In order to further understand the mechanism of biomass co-refining，effects of different oils and fats and fatty acid methyl esters on the composition of bio-light oil were studied in this work.The bio-light oils obtained thereby were analyzed by using the GC-simulated distillation method[24]，with the results presented in Table 5.It can be seen from Table 5 that the contents of diglycerides（or compounds in the boiling range of diglycerides，the same as methyl esters，monoglycerides and triglycerdes in Table5 and the same compounds referred to hereinafter）varied greatly when different oils and fats and fatty acid methyl esters were used.As we all know，there are more linoleic acids containing one conjugated double bond in the soybean oil[25-26]，the degree of unsaturation of which is the highest among the four chemicals[27-28]，and the content of diglycerides in the bio-light oil originating from soybean oil co-refining is the highest too.Methyl oleate contains one double bond，and the degree of unsaturation assumes the second place；meanwhile，the content of diglycerides in bio-light oil assumes the second place too.Methyl palmitate is a saturated compound，which has a lowest degree of unsaturation，and the content of diglycerides in bio-light oil is the lowest.The 24-degree palm oil mainly contains oleic acid and palmitic acid[29]，and the content of diglycerides in bio-light oil is also between that of methyl oleate and methyl palmitate.It can be seen from the analyses mentioned above that the content of diglycerides in bio-light oil is seriously affected by the degree of unsaturation of oils and fats.