Biodiesel production intensification through microbubble mediated esterification
Biodiesel production intensification through microbubble mediated esterification
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DOI：
10.1016/j.fuel.2019.04.173
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发表时间：
2019-10-01
期刊：
影响因子：
7.4
通讯作者：
Rehman, Fahad
中科院分区：
文献类型：
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作者：
Ahmad, Naveed;Javed, Fahed;Rehman, Fahad
化石燃料资源的枯竭和相关的环境问题使世界的注意力集中在寻找可持续和可再生的能源资源，如生物燃料上。由植物油、动物脂肪、废食用油和油脂生产的生物柴油显示出石油柴油的有前途的替代品。传统的生物柴油生产方法由于传质限制而耗时且耗能。这种限制可以通过在气泡界面处进行反应来减少，该气泡界面提供“局部”过量的醇以向前推动平衡，同时增加反应速率。在此过程中，通过烧结硼硅酸盐扩散器进料的甲醇蒸气与游离脂肪酸（在这种情况下为油酸）和催化剂反应。由于甲醇的较低流速和所用扩散器的孔径（15-40 μ m），所产生的气泡明显小于1 mm，并且在200-600 μ m的范围内。动力学研究表明，反应遵循一级动力学w.r.t.油酸在鼓泡反应器中进行的酯化反应在30 min内可使油酸的转化率达到97%，而常规方法在312 min内可使油酸的转化率达到80%。
Depleting fossil fuel resources and related environmental concerns have focused the world's attention on finding sustainable and renewable energy resources such as biofuels. Biodiesel, produced from vegetable oil, animal fats, waste cooking oil, and greases, shows a promising alternative for petroleum-diesel. The conventional biodiesel production methods are time consuming and energy intensive due to mass transfer limitations. This limitation can be reduced by carrying out reaction at a bubble interface which supplies a "local" excess of alcohol to push equilibrium in the forward direction while simultaneously increasing the rate of reaction. During this process, methanol vapors, fed through a sintered borosilicate diffuser, react with the free fatty acids (oleic acid in this case) and catalyst. Owing to the lower flow rates of methanol and pore size of the diffuser (15-40 mu m) used, the bubbles produced are significantly smaller 1 mm and lies in the range of 200-600 mu m. Kinetic study shows that reaction follows first order kinetics w.r.t. oleic acid. The esterification reaction through bubble reactor achieved 97% conversion of oleic acid in 30 min as compared with 80% in 312 min using conventional methods.