Devising methods to prevent hydrate formation is of the important issues in natural gas industry. Since a great deal of money is annually spent on using hydrate inhibitors, identification of new inhibitors with higher degrees of efficacy is economically justifiable. Bearing in mind the significant ole of hydrate inhibitors in prevention of natural gas pipelines’ getting blocked, the present study attempts to investigate two ompounds of NaCl and Na2SO4 as inhibitors of hydrate methane’s formation so as to respond to “what is the inhibitive kinetic impact of lectrolyte compounds of NaCl and Na2SO4 on the formation of methane hydrate?” To do so, this study measures the induction time of ethane ydrate crystals in the presence of electrolyte solutions of NaCl and Na2SO4 and compares the results obtained with the state lacking such inhibitors.
Gas hydrate is a compound, which is formed in the presence of water and the guest molecule under the condition of low temperature and high pressure. After being formed, this stable and tough compound leads to creation of a blockage in natural gas pipelines . In 1810 Devi, an English chemist, for the first time found out the formation of gas chloral hydrate while cooling an aqueous solution of chlorine in the temperature of 10 degrees centigrade . In 1934, Homer and Schmitt found that the hydrate formed created a blockage in gas pipelines. Thenceforth, Diatom and Frost were of the early scientists who conducted and reported on empirical experiments on hydrate formation . More serious studies on these molecules were carried out regarding their crystal structure, properties, and formation conditions as well as ways to inhibit their formation. To examine kinetic conditions of hydrate formation, Dimo Kashchieva and Abbas Firoozadib investigated correlation of oversaturation with crystal growth and induction time. Velocity of hydrate growth has been modeled by several researchers through measuring the velocity of gas consumption at the time of hydrate formation . In addition, various crystallization-based kinetic models have been proposed to predict hydrate formation conditions; however, validity of these models requires the relevant data on the particle size distribution (PSD) of the gas hydrate .
Publisher : 2nd National Iranian Conference on Gas Hydrate (NICGH)
By : M.Manteghian ,H.Ahmadi
File Information: English Language/ 8 Page / size: 622 KB
سال : 1392
ناشر : دومین کنفرانس ملی هیدرات گاز (NICGH)
کاری از : م. مجتهدان، حسن احمدی
اطلاعات فایل : زبان انگلیسی / 8 صفحه / حجم : KB 622