采用位移传感器考察萃余煤在乙醇中溶胀特性  

SWELLING BEHAVIOR OF EXTRACTED COALS IN ETHANOL BY A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER DEFORMATION TRANSDUCER

作　　者：陈垒[1,2] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原博士生030001 [2]中国科学院研究生院,北京100039

出　　处：《煤炭转化》2013年第2期6-10,共5页Coal Conversion

摘　　要：通过对煤样进行正己烷和四氢呋喃索氏萃取处理,脱除了煤中低分子化合物,萃余煤在不同温度下真空干燥处理以避免萃取溶剂的残留,采用位移传感器溶胀测量装置考察并对比了原煤和萃取处理后煤样在乙醇中的溶胀特性.结果表明,不同温度下真空干燥处理萃余煤的热脱附-质谱分析显示,110℃真空干燥24h处理萃余煤出现萃取溶剂分子质谱特征碎片离子逸出峰,150℃真空干燥24h处理萃余煤没有出现显著溶剂分子质谱特征碎片离子逸出峰.四氢呋喃萃取处理后煤样,110℃真空干燥后,初始时刻溶胀速率较原煤显著增快,且平衡溶胀比显著增加;150℃真空干燥后煤样,由于进一步脱除了煤中残留的四氢呋喃,在乙醇中初始时刻溶胀速率降慢,平衡溶胀比减小,与原煤相近;正己烷萃取处理后110℃和150℃真空干燥后煤样的初始时刻溶胀速率较原煤降低,110℃真空干燥后煤样平衡溶胀比与原煤相比显著降低,150℃真空干燥后煤样的平衡溶胀比增大,与原煤相近.Soxhlet extraction treatment of coal by hexane and tetrahydrofuran （THF） was used to remove low molecular weight compounds. In order to avoid extraction solvent resi- dues in coal, the extracted coal was dried under vacuum at different temperatures. The swelling behaviors of raw coal and extracted coals in ethanol were compared by linear variable differential transformer （LVDT） deformation transducer apparatus. The results showed that thermal desorp- tion-mass spectrometry analysis of extracted coals showed there are extraction solvent residues in coal for drying at 110 ℃ for 24 h, while the amount of solvent residues is reduced by drying at 150 ℃ for 24 h. After drying under vacuum at 110 ℃, the initial swelling rate of extracted coal by tetrahydrofuran is faster than that of raw coal, and the equilibrium swelling ratio increased signif- icantly. After drying under vacuum at 150 ℃, the initial swelling rate and the equilibrium swelling ratio decreases for reducing the amount of residue tetrahydrofuran. For under vacuum at 110 ℃ and 150 ℃ dried hexane extracted coal, the initial swelling rate is slower than that of raw coal. The equilibrium swelling of hexane extracted coal dried at 110 ℃ is less than that of raw coal. After drying under vacuum at 150 ℃, the equilibrium swelling ratio increases and is close to raw coal.

关 键 词：低分子化合物 溶胀 位移传感器 

分 类 号：TQ531.5[化学工程—煤化学工程]