Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei 10607, Taiwan.
Department of Chemical Engineering, University of San Carlos - Talamban Campus, Nasipit, Talamban, Cebu City 6000, Philippines.
Bioresour Technol. 2015 Dec;197:30-6. doi: 10.1016/j.biortech.2015.08.033. Epub 2015 Aug 20.
Most previous studies reported in literature on biodiesel production from sludge were performed by acid catalyzed transesterification that required long reaction time (about 24h) and high methanol loading. The objective of this study was to investigate the in situ transesterification of sludge in subcritical mixture of methanol and acetic acid. At 250°C and a solvent (85% methanol and 15% acetic acid) to sludge ratio of 5 (mLg(-1)), a FAME yield of 30.11% can be achieved in 30min, compared to the yield of 35% obtained by the acid-catalyzed (4% H2SO4) transesterification which required 24h at 55°C and a methanol to sludge ratio of 25 (mLg(-1)). The method developed in this study avoided using mineral acid, significantly reduced reaction time and methanol loading to achieve comparable FAME yield.
大多数之前在文献中报道的关于从污泥中生产生物柴油的研究都是通过酸催化酯交换反应进行的，该反应需要较长的反应时间（约 24 小时）和高甲醇负荷。本研究的目的是研究在甲醇和乙酸的亚临界混合物中污泥的原位酯交换反应。在 250°C 下，溶剂（85%甲醇和 15%乙酸）与污泥的比例为 5（mLg(-1))，30 分钟内可得到 30.11%的 FAME 产率，而酸催化（4%H2SO4）酯交换反应在 55°C 下需要 24 小时，甲醇与污泥的比例为 25（mLg(-1))，产率为 35%。本研究中开发的方法避免了使用矿物酸，显著缩短了反应时间和甲醇负荷，达到了可比的 FAME 产率。
