负载固体酸催化豆油制备生物柴油的研究

以负载固体酸为催化剂,甲醇和大豆油为原料,合成了生物柴油。在单因素的基础上,应用Box-Behnken中心组合原理,对醇油量比,催化剂用量,反应时间三个因素进行了三水平的实验设计。通过响应面分析,确定最佳工艺为:醇油量比7∶1,m(催化剂)/m(豆油)为5.95%,反应时间3.75h。此条件下生物柴油产率为96.62%。多次使用后,催化剂仍表现出较好的催化活性。并利用XRD、FT-IR光谱表征了催化剂的物相和产品结构,用气相色谱-质谱联用法对产品进行了定性和定量分析。

Study on supported solid acid catalyst for preparation of biodiesel from soybean oil

Preparation of biodiesel from methanol and soybean oil with actived carbon supported p-toluene sulfonic acid as catalyst was studied.Based on the single factor experimental results of the molar ratio of methanol to soybean oil,catalyst dosage and reaction time,a Box-Behnken center—united design method was used to design the experiments with 3 factors and 3 levels.The experimental results were analyzed by the response surface method,and the optimum reaction conditions were determined as follows: the methanol/soybean oil molar ratio of 7∶1,catalyst/soybean oil mass ratio of 5.95% and reaction time of 3.75 hours.The yield of biodiesel was 96.62% under the above conditions.Repeated use,the catalyst still showed good catalytic activity.The structure of the catalyst was characterized by XRD and FT-IR.The detailed components of the biodiesel product were analyzed by GC-MS qualitatively and quantitatively.