中文摘要：

考察了不同水热处理条件对胜利褐煤主要含氧官能团甲氧基、羧基和酚羟基的脱除效果及其表面亲水性的影响.结果表明,提高温度、延长恒温时间以及增大初压均能不同程度地促进含氧官能团的脱除,甲氧基、羧基和酚羟基的最大脱除率分别为67.88%,89.41%和93.70%.脱除含氧官能团使水热处理后的煤样/水接触角增大,亲水性减弱.通过线性拟合,接触角与三种含氧官能团均表现出较好的相关性,其中羧基的相关性最好,说明羧基束缚水的能力要强于甲氧基和酚羟基.

英文摘要：

The changes in O-containing functional groups and surface hydrophilic property due to hydrothermal treatments under different conditions were examined in this paper using Shengli lignite.The results showed that the increases in reaction temperature,reaction time and and initial pressure could promote the removal of O-containing functional groups to different extents.The maximum removal rate of the methoxy,carboxyl and phenolic hydroxyl were67.88%,89.41%and 93.70%,respectively.The contact angle of the coal samples（with water）increased after the removal of O-containing functional groups,which was a direct reflection of weak hydrophilic property on coal surface.The linear fit analysis demonstrated that the contact angle has a better correlation with carboxyl than other functional groups,implying strong affinity between carboxyl and water due to the formation of hydrogen bond.