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| 固体碱氢氧化钡的制备及催化蓖麻油酯交换制备生物柴油的研究 |
| Preparation of solid base barium hydroxide and its catalysis in transesterification of castor oil for biodiesel |
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| DOI： |
| 中文关键词: 固体碱氢氧化钡 蓖麻油 酯交换反应 |
| 英文关键词:solid base barium hydroxide castor oil transesterification |
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| 中文摘要: |
| 以Ba(OH)2·8H2O为前体，通过两段真空加热脱水法制备了固体碱催化剂氢氧化钡。采用热重分析和X射线衍射分析技术进行催化剂的表征。以蓖麻油为原料，通过单因素实验考察了氢氧化钡的催化活性。结果表明：真空加热脱水第一阶段温度应选择70?℃，第二阶段温度应选择150?℃；催化剂前体Ba(OH)2·8H2O经第一阶段的真空加热脱水处理全部转化为β-Ba(OH)2·H2O，再经第二阶段的真空加热脱水处理全部转化为β-Ba(OH)2；在蓖麻油的酯交换反应中，在醇油摩尔比9∶?1、催化剂用量2%、反应温度60?℃、反应时间30 min条件下，转化率为93.80%，且固体碱氢氧化钡在此最优条件下重复使用4次时，转化率仍超过80%。 |
| 英文摘要: |
| Using Ba(OH)2·8H2O as precursor, solid base catalyst barium hydroxide was prepared by two-stage vacuum heating dehydration. The catalyst was characterized by thermogravimetric analysis and X-ray diffraction analysis. The catalytic activity of barium hydroxide in transesterification of castor oil with methanol was investigated by single factor experiment. The results showed that the vacuum heating temperature of the first stage should be set at 70?℃, and the second stage should be set at 150?℃; catalyst precursor Ba(OH)2·8H2O turned into β-Ba(OH)2·H2O through the first stage vacuum heating dehydration, and then turned into β-Ba(OH)2 through the second stage vacuum heating dehydration; under the conditions of molar ratio of methanol to oil 9∶?1, catalyst dosage 2%, reaction temperature 60?℃ and reaction time 30 min, the conversion rate of transesterification could reach 93.80%, and it was still above 80% after the catalyst had been reused for four times. |
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