Hydrate dissociation pressures for methane or ethane in the presence of aqueous solutions of triethylene glycol

Abstract

Hydrate dissociation pressures for methane or ethane contacting aqueous solutions of triethylene glycol have been measured in the temperature range 273-294 K. A simple measurement technique is described which utilizes a high-pressure visual cell and is believed to be inaccurate to ±0.25 MPa in general, increasing to ±0.5 MPa at higher pressure.

A model for prediction of gas hydrate formation conditions in aqueous solutions containing electrolytes and/or alcohol

“…for all of 57 data points was found to be 2.5 per cent with a maximum error of 5.82 per cent. The maximum error was found at T = 273.16 K and (25) pressure for methane hydrate formation conditions in triethylene glycol solutions plotted against temperature. , pure water; ♦, TEG20; , TEG40; -, predicted.…”

“…Figure 1 shows the methane hydrate dissociation pressures in aqueous solutions containing electrolytes. Using the proposed model, the a.a.p.e.s for the prediction of (25,26) pressure for methane hydrate formation conditions in aqueous solutions containing electrolytes plotted against temperature. , pure water; ♦, Na3; , Na3K3; , Na5K5; •, Na10Ca3; •, Na6Ca10; , Na10K12; -, predicted.…”

“…(10) The optimized parameters were determined and reported in table 3. The methane and ethane hydrate-formation conditions of Ross and Toczylkin (25) were used to determine the Margules equation parameters of triethylene glycol solution. For determining the Margules equation parameters for aqueous methanol solution, the experimental data of Blanc and Tournier-Lasserve (26) for methane and natural gases hydrate formation conditions were used.…”

Experimental Simulation of the Exploitation of Natural Gas Hydrate

“…Many studies have been carried out for investigating the equilibrium conditions of gas hydrate in the presence of inhibitors [80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98]. Thereof, Ross and Toczylkin [80] investigated the behaviors of hydrate dissociation pressures for methane or ethane containing aqueous triethylene glycol with an isothermal apparatus. Englezos and Bishnoi [82], Englezos [83], Hutz and Englezos [84] studied gas hydrate formation/decomposition behaviors in electrolyte solutions.…”

Phase Equilibria of Clathrate Hydrates in Hydrogen Sulfide + diethylene Glycol or Triethylene Glycol + water System

“…This experimental data could be of interest for developing predicting tools with the aim of studying the hydrate stability zones of sour reservoir fluids. So far, hydrate dissociation data were reported by different authors for various gases: Ross and Toczylkin (1992) reported experimental dissociation conditions of methane and ethane hydrates in the presence of TEG aqueous solutions. Later, Servio and Englezos (1997) measured and reported hydrate dissociation conditions of propane in the presence of TEG aqueous solutions.…”