Compared with the results reported by Karagöz et al. [11] on liquefaction of rice husk at 553 K in water, the adoption of ethanol as solvent during the rice husk liquefaction resulted in not only higher yields of bio-oil but also different compositions of bio-oil. For instance, the liquid product obtained by Karagöz et al. [11] contained little amounts of esters (0.8% in acetone extract), while the bio-oils produced in this study had a much higher content of esters. As shown in Table 3, without catalyst the content of esters reached up to 15%. In the presence of NaOH catalyst, the concentration of esters was 11%. Meanwhile, no alkane was identified in the work of Karagöz et al. [11], but a significant amount of long-chain alkanes were detected in this study. In this case, it seemed feasible that the presence of ethanol could promote the formation of long-chain alkanes.