【摘要】 采用体积法研究了甲苯、四氢萘、甲醇、二甲亚砜、N,N-二甲基甲酰胺(DMF)和乙醇胺(MEA)5种纯溶剂及1∶1的MEA-DMF混合溶剂对神华烟煤的溶胀行为,考察了Fe(NO3)3、Fe2(SO4)3和FeSO4添加量为0.5%(以铁占煤质量计)作为溶胀促进剂的性能。结果表明:MEA-DMF混合溶剂的溶胀效果优于5种单一溶剂。铁盐Fe(NO3)3明显促进煤溶胀,在80℃,24h和剂煤比5∶1条件下MEA-DMF混合溶剂与Fe(NO3)3协同可使溶胀率超过3.0。对溶胀处理后的神华煤FT-IR表明DMF、DMF-MEA溶胀处理以及与Fe(NO3)3协同溶胀处理后明显削弱了煤羟基氢键间的缔合作用,其中,经DMF-MEA与Fe(NO3)3协同溶胀处理的这一变化最为明显。更多还原

【Abstract】 Swelling of Shenhua coal in toluene,tetralin,methanol,dimethyl sulfoxide,N,N-dimethylformamide(DMF)and monoethanolamine(MEA),as well as in a mixed solvent of DMF-MEA(1∶1)was investigated via the swelling volume method. Coal swelling improvement with 0.5% of Fe(NO3)3,Fe2(SO4)3 and FeSO4(based on Fe to coal)as swelling promoters were studied. Results showed that the coal swelling in the DMF-MEA mixed solvent was markedly better than any of the pure solvents. The swelling was clearly improved with Fe(NO3)3. The coal swelling ratio reached to over 3.0 with MEA-DMF and Fe(NO3)3 at 80 ℃ for 24 h and solvent to coal ratio of 5∶1. FT-IR of the swelled coal showed an improved coal hydrogen bonding dissociation. The coal hydrogen bonding dissociation was the most obvious in the swelling system of DMF-MEA and Fe(NO3)3.更多还原