The result indicates that the acid value of material quickly fall to reach the requirement of transesterification by circulating gas-phase esterification.The degree of biodiesel exceeds 99.5%.

• 实验结果表明，循环气相酯化可在很短的时间内将原料的酸值降到酯交换对原料酸值的要求，通过水蒸汽蒸馏可使生物柴油纯度达到99.；5%25以上。