Gas-liquid countercurrent integration process for continuous biodiesel production using a microporous solid base KF/CaO as catalyst

► A novel continuous flow integration process was developed for biodiesel production. ► The process has the characteristic of countercurrent contact reaction between gas and liquid. ► The process has the characteristic of rapid and automatic separation for glycerol on line. ► The process has the characteristic of cyclic utilization of methanol. ► Biodiesel yield of as high as 93.7% was obtained in this integration process.