• the equilibrium conditions, hydrate formation and dissociation rate and storage capacity of ethylene hydrate in presence of 1,4-dioxane

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 495
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the effect of 1,4-dioxane on ethylene hydrate was investigated at three additive molar concentrations of 2.78%, 5.56% and 8.34%. the equilibrium conditions for hydrate dissociation were obtained by step heating method. the results showed that addition of 1,4-dioxane concentration increases the pressure of hydrate dissociation. diagram ofln(peq) vs. teq demonstrated that system of 1,4-dioxane + ethylene + water form ethylene hydrate with structure i. in fact 1,4-dioxane cannot participate in hydrate structure because ethylene molecules are not a good help gas for occupation of s-cages in structure ii. so, in this condition only ethylene hydrate with structure i could be formed. the experimental results on hydrate formation indicted that 1,4-dioxane accelerates the hydrate growth rate by increasing the solubility of ethylene in water and a maximum storage capacity of (vstp/vh) = 146 is obtained in a critical dioxane concentration of 5.56% by mole. also hydrate dissociation experiments revealed that maximum dissociation percentage is related to pure water (48%) and 1,4-dioxane decreases dissociation percentage of ethylene hydrate.

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