EFFECTS OF CITRIC-ACID WASHING ON THE THERMODYNAMIC INTERACTION OF SOME COALS WITH ACIDS

被引:9
作者
AHSAN, T
WU, JH
ARNETT, EM
机构
[1] Department of Chemistry, P. M. Gross Chemical Laboratory, Duke University, Durham, NC 27708-0346
关键词
CITRIC ACID WASHING; COAL; THERMODYNAMICS;
D O I
10.1016/0016-2361(94)90096-5
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Samples of Wyodak and Illinois No. 6 coals were subjected to citric acid washing treatment and their heats of immersion (DELTAH(imm)) in 13 acids of varying strength were compared to those of the parent coals and of polyvinylpyridine, a prototype solid base. The effect of the treatment on the Wyodak sample is considerable, but quite dependent on the nature of the acid, while citric acid washing produces only minor effects on DELTAH(imm)s of the higher ranked Illinois coal. Interactions of treated and untreated coals with phenol and 3,5-di-t-butylphenol were also studied by flow microcalorimetry, and by adsorption isotherms from solution. Both of these techniques show that the structure of Wyodak is affected significantly by citric acid washing and that sites are apparently exposed which favour adsorption of aromatic systems.
引用
收藏
页码:417 / 422
页数:6
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