摘要
含硫４９０％的高变质程度煤在半连续式反应器中用醇碱和醇水溶剂进行了超临界萃取。利用Ｍｓｂａｕｅｒ和ＸＰＳ技术分析了不同反应条件下的固体产物形态硫。超临萃取脱硫中，黄铁矿变化为ＦｅＳ２→ＦｅＳ＋Ｆｅ１－ｘＳ，其转化量和ｘ值取决于反应条件，特别是温度。在煤的有机硫基团中，ＰｈＳＨ、Ｐｈ２Ｓ和四氢噻吩容易脱除。Ｐｈ２ＳＯ脱除较难，可用提高反应温度和往乙醇溶剂中加些水脱除，噻吩最难脱除，其脱除需要较高的反应温度。
A high rank coal with total sulfur of 490% was extracted employing alcohol/KOH and alcohol/water under supercritical conditions in a semicontinous reactorIt was found that supercritical desulfurization is mainly taking place within abaut 1h at 400℃When the ethanol concentration was 95 vol%the organosulfur removal achieved the maximumEthanol/KOH solution as supercritical solvent enhanced the desulfurization processUsing Mssbauer and XPS techniques the sulfur forms in solid products obtained at different reaction were analyzedThe results show that:during supercritical desulfurization the pyritic sulfur is removed as following process;FeS2FeS+Fe1-xS,the transformation amounts and the value of x are dependent on reaction conditions,especially on temperatureAmony the organic sulfur groups PhSH,Ph2S and thiolane are easily removed ;Ph2SO is more difficult to be removed,its removal may be realized by increasing temperature and adding some water into ethanol;thiophene is most difficult to be removed,its removal needs high reaction temperature
出处
《洁净煤技术》
CAS
1997年第2期21-25,33,共6页
Clean Coal Technology
关键词
煤
超临界萃取
脱硫
醇水溶剂
coal,supercritical desulfurization,alcohol,sulfur forms
