《Table 4 Extractive separation of the products from biomass co-refining by different solvents》

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

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Different solvents and co-refining liquid products after removing methanol and acetone（1:1 in volume）were added into a test tube，and then the test tube was shaked prior to being subject to settling.The phenomenon was observed and recorded after 24 hours.The results are showed in Table 4.In the experiments，deionized water，heptane，pyridine，ethyl acetate and isobutyl alcohol were used individually to separate the co-refining products.It was found that when deionized water was used，the upper oil phase and the lower water phase were observed，but there was some amount of oil in water phase which was difficult to be separated；when heptane was added，lots of solid appeared，which could be separated by filtration；and when other solvents were added，a homogeneous phase was observed.Obviously，the co-refining products could be separated by heptane.Upon taking into account the cost，petroleum ether in place of heptane was proposed to be used as the extractive separation solvent，which was confirmed by the experiment.The following studies adopted a 60—90°C fraction of petroleum ether as the solvent，with the experimental procedure described as follows.