在多相喷气循环反应堆中,使用聚氧甲酸催化剂,先进的甘油氧化到酸
Ira Christina Wirth1, Daniel Niehaus1, Dorothea Voß1
1Institute of Technical and Macromolecular Chemistry, Universität Hamburg, Bundesstrasse 45, Hamburg 20146, Germany.
概括
这项研究展示了一种喷气循环反应堆 (JLR) 来有效地从甘油中生产生物原型甲酸 (FA). 与式反应堆相比,JLR具有显著的质量转移优势,可在较低的氧气压力下实现高产量.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 绿色化学 绿色化学
- 催化剂是一种催化剂.
背景情况:
- 作为生物柴油副产品的甘油可以转化为有价值的生物原酸 (FA).
- 目前的工业FA生产 (OxFA工艺) 使用水箱反应堆 (STR),但由于低氧溶解度而受到限制,需要高压力 (10-30 bar).
- 有效的气液质量转移对于优化这种氧化反应至关重要.
研究的目的:
- 实施和评估喷气循环反应堆 (JLR),用于多相选择性氧化糖醇到FA.
- 将JLR的经济和质量传输性能与传统的STR进行比较.
- 确定动力参数并评估JLR中的反应模式.
主要方法:
- 使用同质的H5PV2Mo10O40 (HPA-2) 聚氧甲酸盐催化剂进行糖醇氧化.
- 描述了JLR以确定体积质量转移系数 (k l · a 值).
- 在相同条件下的JLR和STR中比较糖醇氧化性能.
- 确定了动力参数 (反应顺序,激活能量) 和JLR中的哈塔号.
主要成果:
- 喷气式飞机展示了高效的气体液体质量转移,从51到173小时-1的值.
- 在只有5bar的氧气压力下,JLR实现了高FA时空收益率 (STY) 高达30.0gFA LR-1h-1 .
- 在JLR的动力分析显示,糖醇的反应顺序为0.83,氧气的反应顺序为0.54,激活能量为78.3kJmol-1.
- 一个Hatta数为0.014表示反应在JLR的低压下在动态状态下运行.
结论:
- 喷气循环反应堆 (JLR) 与STR相比,为从糖醇生产生物原型酸提供了显著的质量转移和经济优势.
- 在较低的氧气压力下,JLR促进了高效的氧化,证明了其在绿色化学合成方面的巨大潜力.
- 该研究强调了JLR作为优化催化氧化过程的有希望的反应堆概念.
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