水+甲烷系统的气液相边界曲线和临界线.pdf

物理化学学报( li Huaxue Xuebao)
August
Acta Phys.-Chim.Sin.2012,28(8),1803-1808
1803
Article
doi:10.3866/PKU.WHXB201205211
www.whxb.pku
ul.edu.ch
水+甲烷系统的气液相边界曲线和临界线
田玉芹12田宜灵1赵林1朱荣娇1'马超
(长江大学石油工程学院,湖北荆州434023;天津大学理学院化学系,天津30002
2中国石油化工股份有限公司胜利油田采油工艺研究院,山东东营257000
摘要:采用带有蓝宝石视窗和磁力搅拌的可变体积高压斧得出了水+甲烷系统的气液相边界曲线和临界曲
线.实验温度为43.0-633.0K,实验压力为30.00-300.00MPa.实验确定了甲烷在富水区的亨利系数,结果
显示,在433,0-603.0K的温度范围内,此亨利系数随着温度的升高而下降.本文还研究了甲烷+水系统的气液
分配比以及偏摩尔溶解焓和偏黁尔溶熵数据.结果发现,甲烷和水的内聚能密度差别很大.
关鍵词:水+甲烷系统;相边界曲线;临界曲线;亨利系数;偏摩尔溶解娢;偏摩尔溶解熵
中图分类号:O642
Gas-liquid Phase Boundary Lines and Critical Curve for
the Water+Methane System
TIAN Yu-qin 2 TIAN Yi-ling ZHAO Lin ZHU Ron-jiao'ma Chao
College ofpetroleum Engineering. Yangtze University, Jingzhou 434023, Hubei Province, P R China; Department of
Chemistry, School ofscience, ianjin University, ianjin 300072 P R. China Tnstitute f Production Technology, Shengli
Oi field Company, China Petroleum Chemical Corporation, Dongying 257000, Shandong Province, P R China
Abstract: The isothermal gas-liquid phase boundary lines and critical curve were determined for the
water+methane system Experiments were performed in a high-pressure volume-variable autoclave with a
sapphire window and magnetic stirring. The temperature range was from.0 to 633.0 K and pressure
from 30.00 to 300.00 Mpa. Henry coefficients of dilute methane solutions were determined; the results
show that these coefficients decrease with increasing temperature in the range from 433.0 to 603.0 K. The
equilibrium ga-qui ati a mar tion entalpy, and partial molar solution entropy were also
calculated. The results show that the difference in the cohesive energy density between methane and
water is very large
Key Words: Water+methane system; Phase boundary line Critical curve; Henry coefficient
Partial molar solution enthalpy; Partial molar solution entropy
1 Introduction
key in understanding carbon-reservoir fluxes within the deep
The modern abiotic-origin theory of methane and numerical Earth. Deep hydrocarbon gas reservoirs would produce huge
modeling show that new resources are most likely to be locat- amounts of water(liquid or vapor)during their production peri-
ed at deep subsurface levels and characterized as high tempera- ods. Hence, many studies have been done on water-methane
ture and high prcssurc gas reservoirs This abiotic theory, if mixtures. -For example, Mohammadi et al. performed
true, could affect estimates of the potential future oil and gas
low-pressure(ca 0.1-34 Mpa) and low-temperature(273-340
reserves. Detcrmining the thermodynamic properties of sys-k)measurements. Yarrison et al. published data at a prcssure
tems containing methane at high temperature and pressure is of 110 Mpa, As oil and gas exploration moves to wider depths,
Received: March 7, 2012; Revised: May 21, 2012; Published on Web: May 21, 2012.
Corresponding author. Email: Zhurongjiao(tju.edu. cn; Tel: +-86-22-27406140
Parallel to the first address
C Editorial office of Acta Physico-chimica Sinica