CAJ | 학술논문

用氢氧化钙和氢氧化钠联合改性活性白土制备了膨润土固体碱催化剂，并用于麻疯树油和甲醇酯交换反应合成生物柴油。主要目的是研究酯交换反应的动力学及纯化反应获得的粗生物柴油使其达到相关国际标准。首先在消除内外扩散的条件下，测定323.15～338.15 K温度范围内的反应动力学数据，并用拟均相模型进行拟合。在室温下使用膨润土为吸附剂对粗生物柴油进行纯化，以移除游离甘油为目标，考察吸附剂用量和吸附时间的影响，以获得适宜纯化条件。结果表明，膨润土固体碱催化剂有较高的活性和稳定性，所得生物柴油粗产品质量较好；反应过程符合拟一级反应动力学机理，活化能67.87 kJ·mol?1；在3%（质量分数）的膨润土用量，室温吸附30 min的条件下，纯化后的生物柴油符合欧洲标准（EN 14214）且产品收率超过96%。
용경양화개화경양화납연합개성활성백토제비료팽윤토고체감최화제，병용우마풍수유화갑순지교환반응합성생물시유。주요목적시연구지교환반응적동역학급순화반응획득적조생물시유사기체도상관국제표준。수선재소제내외확산적조건하，측정323.15～338.15 K온도범위내적반응동역학수거，병용의균상모형진행의합。재실온하사용팽윤토위흡부제대조생물시유진행순화，이이제유리감유위목표，고찰흡부제용량화흡부시간적영향，이획득괄의순화조건。결과표명，팽윤토고체감최화제유교고적활성화은정성，소득생물시유조산품질량교호；반응과정부합의일급반응동역학궤리，활화능67.87 kJ·mol?1；재3%（질량분수）적팽윤토용량，실온흡부30 min적조건하，순화후적생물시유부합구주표준（EN 14214）차산품수솔초과96%。
A bentonite catalyst was prepared using acid-treated bentonite modified by calcium hydroxide and sodium hydroxide with wet method, and it was applied in the transesterification of jatropha oil with methanol to form biodiesel. Firstly, the kinetics of this transesterification reaction was studied in the temperature range of 323.15—338.15 K after eliminating both inner and outer diffusion effects. Then, the crude biodiesel from the transesterification was purified using the adsorption of natural bentonite at room temperature, and the effects of bentonite dosage as well as adsorption time on the removal of free glycerin were investigated. The results showed that the conversion of jatropha oil to biodiesel on the prepared catalyst reached 96.7% under the optimized conditions. And the transesterification can be well described using the pseudo-first-order kinetic model with the activation energy of 67.87 kJ·mol?1.The purified product could meet the requirements of European Standard for biodiesel fuel (EN 14214) with the yield of biodiesel over 96%, when the purification process was performed with a bentonite dosage of 3% (mass) and reaction time of 30 min.