Kinetic study of CH4 hydrate formation in the presence of tetrabutylphosphonium chloride (TBPC)

Methane hydrate is considered as an excellent choice for transporting and storing natural gas. To improve the hydrate formation conditions, adding semiclathrate hydrate formers was strongly recommended. The major objective of this study was to investigate formation kinetics of tetrabutylphosphonium...

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Bibliographic Details
Published in:Journal of Molecular Liquids
Main Authors: Shi, Lingli, Liang, Deqing
Format: Report
Language:English
Published: ELSEVIER SCIENCE BV 2018
Subjects:
Tetrabutylphosphonium chloride
Methane hydrate
Hydrate formation kinetics
Gas transportation and storage
N-BUTYLAMMONIUM BROMIDE
AQUEOUS-SOLUTION
GAS HYDRATE
PHASE-EQUILIBRIUM
AMMONIUM BROMIDE
IONIC LIQUIDS
COLD-STORAGE
GROWTH-RATE
CO2
INHIBITION
Chemistry
Physics
Physical
Atomic
Molecular & Chemical
Online Access:http://ir.giec.ac.cn/handle/344007/24435
http://ir.giec.ac.cn/handle/344007/24436
https://doi.org/10.1016/j.molliq.2018.09.071
Description
Summary:Methane hydrate is considered as an excellent choice for transporting and storing natural gas. To improve the hydrate formation conditions, adding semiclathrate hydrate formers was strongly recommended. The major objective of this study was to investigate formation kinetics of tetrabutylphosphonium chloride (TBPC) + CH4 semiclathrate hydrate. Using isobaric kinetics measurement, the experiment was conducted systematically with various pressures (P: 4.0 MPa, 6.0 MPa), temperatures (282.1 K, 275.2 K, subcooling degree of 6 K), and salt concentrations (w: 0.05-030 mass fraction). Total gas consumption, normalized gas consumption, salt-to-hydrate conversion, rapid growth rate, and gas consumption percentage were calculated. The results revealed that for TBPC + CH4 hydrate salt-to-hydrate conversion was greatly affected by the concentration of TBPC. And the gas consumption percentage was found to reach 0.5 in the first 2 h for TBPC + CH4 hydrate. For designing gas storage process and fast hydrate formation process, the system with (w = 0.05, P = 6.0 MPa, subcooling degree of 6 K) and system with (w = 0.10, P = 6.0 MPa, T = 282.1 K) were recommended, respectively. (C) 2018 Elsevier B.V. All rights reserved.

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