地热泥基硅酸钠催化剂在甲酯生产过程中的失活

Inasanti Pandan Wangi, I. Perdana
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引用次数: 1

摘要

固体催化剂的失活是预测催化剂催化反应时间的重要参数之一。本研究应用该催化剂催化玉米油与甲醇的酯交换反应。以Dieng地热发电厂固体污泥为原料,采用NaOH法制备水玻璃,并用凝胶法提取二氧化硅。采用400℃、升温速率20℃/min、保温时间3 h的焙烧工艺对硅酸钠催化剂进行活化。反应温度为60℃,甲醇与玉米油摩尔比为9:1,催化剂用量为5% (w/w),反应时间为60分钟。将玉米油倒入烧瓶后,分别于0、5、10、20、40和60分钟取样。将用过的催化剂与反应物和产物分离,然后用甲醇洗涤,在120℃的烘箱中加热2小时至干燥。该催化剂随后用于催化下一个实验运行,为接下来的四个循环。研究表明,该反应的转化率随着反应周期的增加而降低。最合适的反应动力学模型是二级动力学。新催化剂的最高转化率为91.67%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GEOTHERMAL-SLUDGE-BASED SODIUM SILICATE CATALYST DEACTIVATION IN METHYL ESTER PRODUCTION PROCESS
The deactivation of solid catalyst is one of the catalyst parameters that has to be known to predict how long catalyst can be used to catalyze a reaction. In this research, the catalyst was applied to catalyze the transesterification of corn oil with methanol. Sodium silicate was produced from NaOH and silica was extracted by gelation method from Dieng Geothermal Power Plant solid sludge which had 55% of silica content. Sodium silicate catalyst was activated by calcination process at 400 o C, with heating rate of 20oC/min, and holding time of 3 hours. The transesterification was run at 60 o C, methanol and corn oil mole ratio of 9:1 and 5% (w/w) catalyst for 60 minutes. The sample was taken at 0, 5, 10, 20, 40 and 60 minutes after corn oil was poured into the flask. The used catalyst was separated from the reactant and product, was then washed with methanol and was heated at 120 o C in the oven for 2 hours until it dried. The catalyst was then used for catalyzing the next experiment run for the next four cycle. This research showed that the conversion of the reaction decreased with every reaction cycle. The most fitting reaction kinetics was modeled with second order kinetics. The highest conversion obtained using fresh catalyst was 91,67%.
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