液态CO_(2)溶浸-酸化煤岩有机基团演化实验研究  

Experimental study on evolution of organic groups in coal rock by liquid CO_(2)leaching and acidification

作　　者：刘廷方 雷杰 黎杰 孙伟 张铎 LIU Tingfang;LEI Jie;LI Jie;SUN Wei;ZHANG Duo(Shaanxi Coal Group Shenmu Zhangjiamao Mining Co.,Ltd.,Yulin 719000,China;School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]陕煤集团神木张家峁矿业有限公司,陕西榆林719000 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《煤矿安全》2023年第11期69-76,共8页Safety in Coal Mines

摘　　要：为了探究煤体经液态CO_(2)溶浸、酸化后,煤体有机基团化学结构的变化特征,在25℃、3 MPa实验条件下,对无烟煤进行了液态CO_(2)溶浸及酸化煤样实验;通过傅里叶红外光谱(FTIR)分析了煤体在液态CO_(2)溶浸及酸化过程中官能团变化规律。结果表明:液态CO_(2)溶浸过程主要发生溶胀、溶解、萃取、键解离和取代反应,液态CO_(2)酸化过程除了发生以上反应外还会发生不同类型的加成反应;以上反应共同造成煤样不同类型的官能团、小分子相有机质、大分子相有机质发生溶出、重组过程;此外,煤样经液态CO_(2)溶浸、酸化后芳香性与缩合度均得到了提升。In order to explore the change characteristics of organic group chemical structure of coal after liquid CO_(2)leaching and acidification,liquid CO_(2)leaching and acidification coal sample experiments were carried out on anthracite at 25℃and 3 MPa.The changes of functional groups in the process of CO_(2)leaching and acidification were analyzed by Fourier infrared spectroscopy(FTIR).The results show that swelling,dissolution,extraction,bond dissociation and substitution are the main reactions in the liquid CO_(2)leaching process,and different types of addition reactions occur in the liquid CO_(2)acidification process besides the above reactions.The above reactions result in dissolution and recombination of different types of functional groups,small molecule phase organic matter and large molecule phase organic matter.In addition,the aromaticity and condensation degree of coal samples are improved after liquid CO_(2)leaching and acidification.

关 键 词：液态CO_(2) 溶浸 酸化 煤岩 有机基团 FTIR 

分 类 号：TD712[矿业工程—矿井通风与安全]