Measurements of Hydrate Equilibrium Conditions for CH4,CO2,and CH4+C2H6+C3H8 in Various Systems by Step-heating Method

›› 2009, Vol. 17 ›› Issue (4): 635-641.

• THERMODYNAMICS AND CHEMICAL ENGINEERING DATA • Previous Articles Next Articles

Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method

CHEN Litao, SUN Changyu, CHEN Guangjin, NIE Yunqiang, SUN Zhansong, LIU Yantao

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Received:2008-10-06 Revised:2009-04-17 Online:2010-12-30 Published:2009-08-28
Supported by:
Supported by the National Natural Science Foundation of China(20676145,U0633003);the National Basic Research Program of China(2009CB219504);the Program for New Century Excellent Talents in University of the State Ministry of Education

Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method

陈立涛, 孙长宇, 陈光进, 聂运强, 孙占松, 刘延涛

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

通讯作者: CHEN Guangjin, E-mail: gjchen@cup.edu.cn
作者简介:
基金资助:
Supported by the National Natural Science Foundation of China(20676145,U0633003);the National Basic Research Program of China(2009CB219504);the Program for New Century Excellent Talents in University of the State Ministry of Education

Abstract

Abstract: Phase equilibrium conditions of gas hydrate in several systems were measured by the step-heating method using the cylindrical transparent sapphire cell device.The experimental data for pure CH₄ or CO₂+deionized water systems showed good agreement with those in the literatures.This kind of method was then applied to CH₄/CO₂+sodium dodecyl sulfate(SDS)aqueous solution,CH₄/CO₂+SDS aqueous solution+silica sand,and(CH₄+C₂MH₆C₃H₈)gas mixture+SDS aqueous solution systems,where SDS was added to increase the hydrate formation rate without evident influence on the equilibrium conditions.The feasibility and reliability of the step-heating method,especially for porous media systems and gas mixtures systems were determined.The experimental data for CO₂+silica sand data shows that the equilibrium pressure will change significantly when the particle size of silica sand is less than 96μm.The formation equilibrium pressure was also measured by the reformation of hydrate.

Key words: equilibrium condition, hydrate, step-heating, sodium dodecyl sulfate, silica sand

摘要： Phase equilibrium conditions of gas hydrate in several systems were measured by the step-heating method using the cylindrical transparent sapphire cell device.The experimental data for pure CH₄ or CO₂+deionized water systems showed good agreement with those in the literatures.This kind of method was then applied to CH₄/CO₂+sodium dodecyl sulfate(SDS)aqueous solution,CH₄/CO₂+SDS aqueous solution+silica sand,and(CH₄+C₂MH₆C₃H₈)gas mixture+SDS aqueous solution systems,where SDS was added to increase the hydrate formation rate without evident influence on the equilibrium conditions.The feasibility and reliability of the step-heating method,especially for porous media systems and gas mixtures systems were determined.The experimental data for CO₂+silica sand data shows that the equilibrium pressure will change significantly when the particle size of silica sand is less than 96μm.The formation equilibrium pressure was also measured by the reformation of hydrate.

关键词: equilibrium condition, hydrate, step-heating, sodium dodecyl sulfate, silica sand

CHEN Litao, SUN Changyu, CHEN Guangjin, NIE Yunqiang, SUN Zhansong, LIU Yantao. Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method[J]. , 2009, 17(4): 635-641.

陈立涛, 孙长宇, 陈光进, 聂运强, 孙占松, 刘延涛. Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method[J]. CIESC Journal, 2009, 17(4): 635-641.

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Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method

Measurements of Hydrate Equilibrium Conditions for CH₄,CO₂,and CH₄+C₂H₆+C₃H₈ in Various Systems by Step-heating Method

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