ABSTRACT

Combining ionic liquid pretreatment with H₂O₂ oxidation desulfurization to remove sulfur from coal is a very valuable subject. In this work, three different types of ionic liquid were used to pretreat coal samples, and then the pretreated coal was treated by 30% H₂O₂ with the assistance of ultrasound, which is compared with the desulfurization effect of raw coal with the same method. The swelling characteristics and contact angle changes of coal samples before and after pretreatment were measured, and the samples before and after pretreatment were characterized by BET, SEM, TG. And the form sulfur changes of coal samples before and after being treated were determined by chemical methods, FT-IR and XPS were used to determine the sulfur-containing functional groups and the sulfur morphological change of coal samples before and after treatment, and different types of ionic liquid recovery experiments were also carried out. The results show that the ionic liquid pretreatment had a swelling effect on the coal samples and improved the wettability of the coal samples. The ionic liquid pretreatment increased the specific surface area and average pore size of the coal sample, as well as the coal particle gap increases, cracks developed on the coal surface. The characterization of the desulfurized samples find that the desulfurization rate of the ionic liquid pretreated coal treated by H₂O₂ with the assistance of ultrasound was significantly increased compared to the raw coal under the same conditions. Ionic liquid pretreatment promoted coal desulfurization, and more sulfur in coal was removed. The ionic liquid recovery experiments reveal that ionic liquid could be stably recovered, the FT-IR characterization experiment of ionic liquids indicate that the recovered ionic liquid had no obvious change of structural properties compared to the fresh ionic liquid.

摘要

将离子液体预处理与H ₂ O ₂氧化脱硫相结合以从煤中去除硫是非常有价值的主题。在这项工作中，使用三种不同类型的离子液体对煤样品进行预处理，然后将预处理过的煤用30％H ₂ O _2处理。在超声波的辅助下，用相同的方法将其与原煤的脱硫效果进行了比较。测量了煤样品在预处理前后的溶胀特性和接触角变化，并通过BET，SEM，TG对预处理前后的样品进行了表征。用化学方法测定了煤样品处理前后的硫形态变化，用FT-IR和XPS分别测定了煤样品中含硫官能团和硫形态变化，以及不同类型。还进行了离子液体回收实验。结果表明，离子液体预处理对煤样具有溶胀作用，提高了煤样的润湿性。离子液体预处理增加了煤样品的比表面积和平均孔径，并且随着煤颗粒间隙的增加，在煤表面上产生了裂纹。对脱硫样品的表征发现，经H处理的离子液体预处理煤的脱硫速率与原煤在相同条件下相比，超声辅助下的₂ O ₂明显增加。离子液体预处理促进了煤的脱硫，并去除了煤中的更多硫。离子液体的回收实验表明可以稳定地回收离子液体，离子液体的FT-IR表征实验表明，与新鲜的离子液体相比，回收的离子液体的结构性能没有明显变化。