Jatropha curcas L. （JCL） seeds were extracted and transesterified in-situ using supercritical methanol extraction in the absence of catalyst at different temperatures （200-280℃） and pressures （8-12 MPa）, and at...Jatropha curcas L. （JCL） seeds were extracted and transesterified in-situ using supercritical methanol extraction in the absence of catalyst at different temperatures （200-280℃） and pressures （8-12 MPa）, and at a fixed reaction time of 30 min with seeds-to-methanol ratio of 1：40 w/v. Design of experiment approach using five-level-two-factors design of Response Surface Methodology （RSM） was used to observe the effect of two independent variables i.e. temperature and pressure and the percent of biodiesel yield which required 13 runs. For optimization of the variables, Central Composite Rotatable Design （CCRD） was used for regression analysis and analysis of variance （ANOVA）. The optimize conditions suggested by RSM were at T = 280℃ and P = 12.04 MPa. The predicted and experimental biodicsel yields were found to be 56.8% and 59.9%, respectively, with relatively small deviation errors of 1.59%.展开更多
The transesterification of Jatropha oil and methyl acetate to biodiesel catalyzed by a compound lipase was investigated.A 5-level-3-factor central composite rotatable design of the response surface method was used to ...The transesterification of Jatropha oil and methyl acetate to biodiesel catalyzed by a compound lipase was investigated.A 5-level-3-factor central composite rotatable design of the response surface method was used to evaluate the effects of compound enzyme amount,compound enzyme formulation and substrate composition on the yield of biodiesel.The optimum conditions were as follows: enzyme amount 0.27 g,compound enzyme formulation 0.15(mass) N234 and substrate composition of methyl acetate to Jatropha oil 10.10.Under optimum conditions,the actual experimental yield was 74.34%,which compared well with the predicted value of 72.55%.The model based on Ping Pong Bi Bi mechanism with substrate competitive inhibition was proposed to describe the reaction kinetics of the transesterification.展开更多
文摘Jatropha curcas L. （JCL） seeds were extracted and transesterified in-situ using supercritical methanol extraction in the absence of catalyst at different temperatures （200-280℃） and pressures （8-12 MPa）, and at a fixed reaction time of 30 min with seeds-to-methanol ratio of 1：40 w/v. Design of experiment approach using five-level-two-factors design of Response Surface Methodology （RSM） was used to observe the effect of two independent variables i.e. temperature and pressure and the percent of biodiesel yield which required 13 runs. For optimization of the variables, Central Composite Rotatable Design （CCRD） was used for regression analysis and analysis of variance （ANOVA）. The optimize conditions suggested by RSM were at T = 280℃ and P = 12.04 MPa. The predicted and experimental biodicsel yields were found to be 56.8% and 59.9%, respectively, with relatively small deviation errors of 1.59%.
文摘The transesterification of Jatropha oil and methyl acetate to biodiesel catalyzed by a compound lipase was investigated.A 5-level-3-factor central composite rotatable design of the response surface method was used to evaluate the effects of compound enzyme amount,compound enzyme formulation and substrate composition on the yield of biodiesel.The optimum conditions were as follows: enzyme amount 0.27 g,compound enzyme formulation 0.15(mass) N234 and substrate composition of methyl acetate to Jatropha oil 10.10.Under optimum conditions,the actual experimental yield was 74.34%,which compared well with the predicted value of 72.55%.The model based on Ping Pong Bi Bi mechanism with substrate competitive inhibition was proposed to describe the reaction kinetics of the transesterification.
