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.

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 ℃，24 h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。