相平衡计算在降低最小混相压力化学剂研究中的应用  

Application of phase equilibrium calculation in the study of chemical agents for reducing minimum miscibility pressures

作　　者：吴春芳 沈之芹 何秀娟 沙鸥 崔乐雨 李应成 Wu Chunfang;Shen Zhiqin;He Xiujuan;Sha O;Cui Leyu;Li Yingcheng(Sinopec Shanghai Research Institute of Petrochemical Technology,Sinopec Key Laboratory of Surfactants for Enhanced Oil Recovery,Shanghai 201208,China)

机构地区：[1]中国石化上海石油化工研究院三采用表面活性剂重点实验室,上海201208

出　　处：《石油化工》2021年第10期1038-1044,共7页Petrochemical Technology

基　　金：中国石化科技攻关课题项目(218021-4)。

摘　　要：采用相平衡计算研究了CO_(2)、十六烷和低碳烷烃、醇、醚等化学剂在70℃、不同压力下的相行为,得到CO_(2)与十六烷的压力-组成(P-X)相图,以及CO_(2)、十六烷和化学剂的三元相图。P-X相图表明,CO_(2)与十六烷在70℃下的最小混相压力约为19.6 MPa。三元相图表明,低碳烷烃降低CO_(2)/十六烷最小混相压力的效率随着烷基链增长基本呈升高趋势;在低碳醇和醚中,甲醇、乙醇和异丙醇不能促进CO_(2)/十六烷混相,正丙醇、丁醇、甲醚、甲乙醚和乙醚都能降低最小混相压力;低碳醇的效率明显高于相同碳数的烷烃与醚,添加0.8%,1.5%,2.0%(x)异丁醇能使最小混相压力分别降低9%,19%,37%。The phase behavior of CO_(2),hexadecane and various additives,such as alkanes,alcohols and ethers with low molecular weight has been studied by equations of state at 70℃under different pressures.The pressure-composition(P-X)phase diagram of the binary system of CO_(2) and hexadecane as well as that of the ternary system of CO_(2),hexadecane and additives are obtained.The P-X phase diagram shows that the minimum miscibility pressure(MMP)of CO_(2) and hexadecane at 70℃is about 19.6 MPa.The ternary phase diagram indicates that the efficiency of alkanes for reducing the MMP of CO_(2) and hexadecane has the tendency of improvement with the increase in alkyl chains.Among alcohols and ethers with the carbon number lower than 4,methanol,ethanol and isopropanol have no contribution to facilitate the miscibility of CO_(2) and hexadecane,while n-propanol,butanol,methyl ether,methyl ethyl ether and ethyl ether can reduce the MMP of CO_(2) and hexadecane,of which alcohol shows dramatically much higher efficiency than that of alkanes or ethers when the numbers of alcohol,alkane and ether are the same.With an addition of 0.8%,1.5%and 2.0%(x)of isobutanol,the minimum miscible pressure can reduce by 9%,19%,37%,respectively.

关 键 词：相平衡计算 二氧化碳 最小混相压力 三元相图 

分 类 号：O642.42[理学—物理化学]