Biodiesel preparation from Semen Abutili (Abutilon theophrasti Medic.) seed oil using low-cost liquid lipase Eversa® transform 2.0 as a catalyst

Abstract

To decrease the cost of biodiesel production, undeveloped nonedible Semen Abutili seed oil (SASO) was first used as a feedstock to prepare biodiesel. Some low-cost liquid lipases were screened and used as green catalysts for biodiesel production via the ethanolysis of SASO. The effect of reaction factors on ethanolysis was optimized by the response surface methodology (RSM). The results demonstrated that SASO was a promising alternative feedstock, and Eversa® Transform 2.0 showed the best performance for biodiesel production from low-quality SASO feedstock (high FFA and phospholipid contents). In addition, Eversa® Transform 2.0 can be reused 3 times without significant loss. The influence of reaction factors on biodiesel yield decreased in the order of reaction temperature > lipase load > reaction time. The maximum biodiesel yield was 94.2 ± 1.3 % under the optimal conditions (lipase load 6%, water content 20 %, 7:1 (mol/mol) ethanol to SASO, 11 h, 37 °C). The kinetic parameters (Vmax and K'm) of the transesterification of SASO were 4.16 × 10−2mol/(L∙min) and 5.27 × 10-1 mol/L, respectively. The Arrhenius equation and activation energy, Ea, of Eversa® Transform 2.0-catalyzed transesterification of SASO were lnV0 = 4.8252–2382.3/T and 19.80 kJ/mol, respectively. The biodiesel produced from SASO was accordance with the ASTM D6751 standard, except for the oxidation stability. Thus, SASO, an undeveloped nonedible low-quality vegetable oil, can be used as a potential feedstock for biodiesel production, and the low-cost liquid lipase Eversa® Transform 2.0 can be used for biodiesel production.