The paper chooses supercritical methanol treatment to remove oxide from lignite and mainly focuses on the effect of temperature, pressure, catalysts and pretreatment ways on deoxidizing rate(R). Experiment results indicate that the deoxidizing rate increases with temperature and pressure within a certain range of temperature and pressure. The deoxidizing rate reaches its maximum at 330 ℃ and decreases if temperature is above that value. Base catalysts are better to raise the deoxidizing rate than acid catalysts. Under the same temperature and pressure, the deoxidizing rate of the sample after swelling is 5. 39% higher than that of the original sample. While the water in the lignite sample has no effect on the deoxidizing rate. So that a high deoxidizing rate needs swelling the coal at first and base as catalysts. Temperature and pressure should reach the critical state at least. After swelling pretreatment in methanol for 8 h, the lignite is treated with methanol for 60 min at 330 ℃ , 8. 2 MPa. The weight ratio of methanol :Xilinhaote lignite is 5 : 1. Solid NaOH is added as catalyst(l%). Under these conditions, deoxidizing rate can reach 32.94%.%选择超临界甲醇处理的方法脱除锡林浩特褐煤中的含氧化合物,主要考察了温度、压力、催化剂种类和预处理方式等对脱氧效果的影响.结果表明,在一定温度和压力范围内,脱氧率随温度和压力的增加而增加.温度330℃时脱氧率达到最大,继续升高温度脱氧率有所降低.碱性催化剂比酸性催化剂更有利于提高脱氧率.在相同的温度和压力等处理条件下,经过溶胀预处理的煤样脱氧率比原煤提高了5.39％,而煤样含水与否对脱氧率的影响则不明显.因此若得到较高的萃取率,应先对煤样进行溶胀预处理,使用碱性催化剂,温度和压力至少达到甲醇临界状态.煤粉经甲醇浸泡溶胀8h后,采用5∶1的溶煤比,以煤样质量1％的NaOH固体为催化剂,在温度330℃,压力8.2 MPa条件下处理60 min,该条件下脱氧率达到了32.94％.
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