金属盐(SO42-/Cl-)固体酸催化剂在污泥制生物柴油中的应用

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摘要研究NaHSO₄·H₂O（布朗斯特酸位为主）和AlCl₃·6H₂O（路易斯酸位为主）两类金属盐固体酸催化剂在污泥制取生物柴油过程中的催化性能.结果表明，经过130℃脱水的NaHSO₄·H₂O较AlCl₃·6H₂O表现更为优异，两种催化剂的最优催化条件为催化剂投加量1.2g/10g冷冻干燥污泥、反应温度130℃、反应时间4h.虽然对粗脂肪的酯化率NaHSO₄·H₂O低于AlCl₃·6H₂O，分别为（63.4±2.6）％和（68.9±1.4）％（对应的生物柴油产率分别为9.73%~10.69％和10.80%~11.39％（污泥干基）），但经过GC-MS分析发现NaHSO₄·H₂O催化的生物柴油纯度更高，品质更好；两种催化剂的重复使用性<3~5次.两种催化剂均可实现低成本、高性能且环境友好的催化污泥制备生物柴油.

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	朱芬芬
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	韩媚玲
	张荣岩

关键词 ：金属盐水合物, 固体酸, 城市污泥, 生物柴油

Abstract：The catalytic performance of two kinds metal salt solid acid catalysts (NaHSO₄·H₂O that mainly were Bronsted acid sites and AlCl₃·6H₂O that mainly were Lewis acid sites) for biodiesel production from sludge was compared. The results showed that NaHSO₄·H₂O dehydrated at 130℃ had better performance than AlCl₃·6H₂O. The optimal catalytic conditions of the two catalysts were as follows:catalyst dosage of 1.2g/10g freeze-drying sludge, reaction temperature of 130℃, reaction time of 4h. The esterification rate of crude fat catalysed by NaHSO₄·H₂O (63.4±2.6)% was lower than that of AlCl₃·6H₂O (68.9±1.4)%, the corresponding biodiesel yields were 9.73%~10.69% and 10.80%~11.39% (sludge dry base). However, the GC-MS analysis showed that the biodiesel catalysed by NaHSO₄·H₂O had higher purity and better quality. The reusability of the two catalysts was <3~5times. Therefore, both of the two catalysts were excellent in biodiesel production from sludge with low cost, high performance and environmental friendliness.

Key words： metal salt hydrates solid acid sewage sludge biodiesel

收稿日期: 2021-02-01

PACS:

X705

基金资助:国家重点研发计划项目（2019YFC1906501）

通讯作者: 张荣岩,硕士,Zhangry0312@126.com E-mail: Zhangry0312@126.com

作者简介: 朱芬芬(1978-),女,湖南邵东人,教授,博士,主要从事固体废弃物处理处置与资源化、水中有毒污染物分析及过程机理研究.发表论文50余篇.

引用本文:

朱芬芬, 胡博, 韩媚玲, 张荣岩. 金属盐(SO₄^2-/Cl^-)固体酸催化剂在污泥制生物柴油中的应用[J]. 中国环境科学, 2021, 41(9): 4176-4183. ZHU Fen-fen, HU Bo, HAN Mei-ling, ZHANG Rong-yan. Application of modified metal salt hydrates containing SO₄²^-/Cl^- in the production of biodiesel from sewage sludge. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4176-4183.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I9/4176

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