## 4 Conclusions  
Molecular distillation was shown to be a suitable method for the deacidification of EAE-produced soybean oil, allowing one to almost completely remove FFAs while avoiding color darkening. The effects of distillation parameters (evaporation temperature, scraper speed, and feed flow rate) on the physicochemical properties of soybean oil were evaluated in detail. The use of high evaporation temperatures and scraper speeds increased deacidification efficiency, avoided product darkening, and favored the retention of tocopherols, while the use of high feed flow rates had the opposite effect. The determined suitable molecular distillation parameters (evaporation temperature = 180 \({}^{\circ}\)C, scraper speed = 220 rpm, feed flow rate = 4 mL/min) were concluded to be applicable to the industrial refining of EAE-produced soybean oil to ensure environmentally friendly production. Moreover, the obtained results are expected to provide a firm theoretical basis for the subsequent lipase extraction and refining processes.  
Conceptualization, B.-K.Q., F.-Y.X. and Y.L.; Funding acquisition, Y.L.; Investigation, L.H. and H.L.; Supervision, Y.L.; Writing--original draft, L.H.; Writing--review & editing, S.Z. and B.-K.Q.  
This research was funded by the National Key Research and Development Program of China, grant number 2016 YFD0401402, Northeast Agricultural University, grant number SB17C01.  
**Acknowledgments:** The authors would like to acknowledge the support of the above sponsors of this study.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Compositions** & **C140** & **C160** & **C161** & **C180** & **C181** & **C182** & **C183** \\
**(\%)** & & & & & & & & \\ \hline \multirow{4}{*}{Evaporation temperature (°C)} & 120 & 0.077 \(\pm\) 0.004\({}^{\circ}\) & 11.38 \(\pm\) 0.03\({}^{\circ}\) & 0.082 \(\pm\) 0.001\({}^{\circ}\) & 3.98 \(\pm\) 0.06\({}^{\circ}\) & 21.79 \(\pm\) 0.03\({}^{\circ}\) & 52.09 \(\pm\) 0.012\({}^{\circ}\) & 8.22 \(\pm\) 0.06\({}^{\circ}\) \\  & 140 & 0.074 \(\pm\) 0.002\({}^{\circ}\) & 11.32 \(\pm\) 0.01\({}^{\circ}\) & 0.07 \(\pm\) 0.007\({}^{\circ}\) & 3.92 \(\pm\) 0.02\({}^{\circ}\) & 21.65 \(\pm\) 0.01\({}^{\circ}\) & 52.24 \(\pm\) 0.03\({}^{\circ}\) & 8.31 \(\pm\) 0.03\({}^{\circ}\) \\  & 160 & 0.074 \(\pm\) 0.005\({}^{\circ}\) & 11.34 \(\pm\) 0.04\({}^{\circ}\) & 0.077 \(\pm\) 0.004\({}^{\circ}\) & 3.97 \(\pm\) 0.01\({}^{\circ}\) & 21.71 \(\pm\) 0.04\({}^{\circ}\) & 52.15 \(\pm\) 0.02\({}^{\circ}\) & 8.29 \(\pm\) 0.01\({}^{\circ}\) \\  & 200 & 0.074 \(\pm\) 0.001\({}^{\circ}\) & 11.37 \(\pm\) 0.01\({}^{\circ}\) & 0.077 \(\pm\) 0.002\({}^{\circ}\) & 3.98 \(\pm\) 0.05\({}^{\circ}\) & 21.68 \(\pm\) 0.09\({}^{\circ}\) & 52.13 \(\pm\) 0.03\({}^{\circ}\) & 8.27 \(\pm\) 0.02\({}^{\circ}\) \\  & 200 & 0.074 \(\pm\) 0.001\({}^{\circ}\) & 11.34 \(\pm\) 0.02\({}^{\circ}\) & 0.081 \(\pm\) 0.003\({}^{\circ}\) & 4.00 \(\pm\) 0.07\({}^{\circ}\) & 21.81 \(\pm\) 0.05\({}^{\circ}\) & 52.02 \(\pm\) 0.006\({}^{\circ}\) & 8.24 \(\pm\) 0.04\({}^{\circ}\) \\ \hline \multirow{4}{*}{Scraper speed (rpm) (rpm) 240} & 180 & 0.078 \(\pm\) 0.001\({}^{\circ}\) & 11.45 \(\pm\) 0.05\({}^{\circ}\) & 0.075 \(\pm\) 0.001\({}^{\circ}\) & 4.01 \(\pm\) 0.008\({}^{\circ}\) & 21.57 \(\pm\) 0.02\({}^{\circ}\) & 52.04 \(\pm\) 0.01\({}^{\circ}\) & 8.36 \(\pm\) 0.05\({}^{\circ}\) \\  & 200 & 0.075 \(\pm\) 0.002\