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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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

Received: 01 February 2021

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X705

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	Articles by authors
	ZHU Fen-fen
	HU Bo
	HAN Mei-ling
	ZHANG Rong-yan

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ZHU Fen-fen,HU Bo,HAN Mei-ling等. Application of modified metal salt hydrates containing SO₄²^-/Cl^- in the production of biodiesel from sewage sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4176-4183.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4176

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