高硫煤的H_2O_2-CH_3COOH溶液体系脱硫研究

STUDY ON DESULFURIZATION OF HIGH-SULPHUR COAL WITH H_2O_2-CH_3COOH SOLUTIONS

采用H2O2-CH3COOH溶液体系对高硫煤进行了脱硫研究,结果表明,H2O2-CH3COOH的溶液体系可有效脱除煤中的硫铁矿硫和有机硫,实验获得的较佳脱硫条件是溶液初始的H2O2质量分数为10%,n(H2O2)∶n(CH3COOH)为10,温度为室温,反应时间60min,液固比为3∶1,搅拌速率300r/min;在此条件下,煤中硫铁矿硫的脱出率和有机硫的脱出率均可达到65%以上.对该体系的脱硫机理分析表明,H2O2的氧化性在CH3COOH的催化作用下得以加强,促使反应生成更多的羟基自由基(·OH)和过氧羟基自由基(·OOH),这些自由基具有较高的电负性或电子亲和能,能够加速脱硫反应的进行,从而实现硫铁矿硫或有机硫从煤中的脱除.

Desulfurization of high-sulphur coal with H2O2-CH3COOH solutions was studied.The results showed that H2 O2-CH3 COOH solution could remove organic sulfur and pyrite sulfur effectively from coal.Based on the experiments,the optimum desulfurization conditions was the initial concentration of H2O2 solution of 10％,n（H2O2） ∶ n（CH3COOH） of 10,room temperature,reaction time of 60 min,solid-liquid ratio of 3 ∶ 1,stirring rate of 300 r/min.Under these conditions,removal rate of pyrite sulfur and organic sulfur in coal could both reach more than 65 ％.According to further desulfurization mechanism analysis on H2 O2-CH3 COOH solution system,the results indicated that H2O2 has powerful oxidation by adding CH3COOH.Under the catalytic action of CH3COOH,H2O2 and CH3COOH could react to generate more hydroxyl free base （· OH） and perhydroxyl radical （· OOH） with high electronegativity or electron affinity,which could improve desulfurization reactions and removal more pyrite sulfur or organic sulfur from coal.