基于反气相色谱技术研究煤表面性质和热力学参数
Study on surface properties and thermodynamic parameters of coal by inverse gas chromatography
努尔比亚·亚力坤 1李园 1王鑫 1赵伟 2李振2
作者信息
- 1. 新疆大学化工学院,新疆煤炭清洁转化与化工过程重点实验室,省部共建碳基能源资源化学与利用国家重点实验室,新疆 乌鲁木齐 830017
- 2. 西安科技大学化学与化工学院,陕西 西安 710054;自然资源部煤炭资源勘查与综合利用重点实验室,陕西 西安 710021
- 折叠
摘要
采用反气相色谱(IGC)技术测定煤的表面性质和热力学性质.在 303.15～343.15 K温度范围内,以 30 种有机溶剂作为探针分子,测定探针溶剂的保留体积.用Schultz和Dorris-Gray两种方法计算了煤样的表面色散自由能,结果为 20.26～36.56 mJ/m2,并且呈现随着温度的升高而递减的趋势.计算Lewis酸碱常数得出的能够表征煤样总酸碱能力的数值KB/KA 值为 6.66,说明表面偏碱性.另外,测定了无限稀释活度系数γ∞12、质量活度系数Ω∞1 和Flory-Huggins相互作用参数χ∞12、溶解度参数δ2 等热力学参数.结果表明,γ∞12随着温度的升高而下降,表明探针溶剂与煤样之间的相互作用力随着温度的升高而增强;χ∞12随着温度的升高而递减,可知四氢呋喃和二氯甲烷的χ∞12值小于0.5,Ω∞1 值小于5,说明探针溶剂四氢呋喃和二氯甲烷是良溶剂;煤的溶解度参数随着温度的升高呈下降的趋势.为加深了解煤性质和后续浮选提质技术提供了借鉴和理论支撑.
Abstract
The surface properties and thermodynamic properties of coal are determined by means of inverse gas chromatography(IGC)technology.In the temperature range of 303.15-343.15 K,30 kinds of organic solvents are taken as probe molecules to determine the retention volume of probe solvents.The surface dispersion free energy of coal samples is calculated by means of Schultz and Dorris-Gray methods,respectively,and the result is in the range of 20.26-36.56 mJ·m-2,which shows a decreasing trend with the increasing temperature.Through calculating Lewis acid-base constant,total pH capacity of coal samples is 6.66,indicating that the surface of coal shows alkaline.In addition,thermodynamic parameters are determined,including infinite dilution activity coefficient γ∞12,mass activity coefficient Ω∞1 and Flory-Huggin's interaction parameter x∞12,solubility parameter δ2.Results show that γ∞12 decreases with the increasing temperature,indicating that the interaction force between probe solvent and coal samples increases with the increasing temperature.x∞12 declines with the increasing temperature,and the calculation results show that x∞12 values of tetrahydrofuran and dichloromethane are less than 0.5,the Ω∞1 values are less than 5,indicating that both tetrahydrofuran and dichloromethane are benign solvent.With the increase of temperature,the solubility parameter of coal samples decreases.The study deepens the understanding on coal properties,and provides reference and theoretical support for subsequent flotation and upgrading technologies.
关键词
红沙泉煤/反气相色谱/表面/吸附/热力学性质Key words
coal/inverse gas chromatography/surface/adsorption/thermodynamic properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据