Abstract
Different types of technological and technical problems in the oil, gas and chemical industries are connected with the hydrate formation process and with the using of anti-hydrate chemicals. That is why, it is necessary to estimate thermobaric ranges within which reagents does not let hydrate to grow or is their dissociation. Also, to estimate anti-hydrate influence we need to determine the chemicals’ anti-hydrate efficiency and chose the best one. They make the reagents consisting of several chemical components depending on the purpose of their application – for prevention of formation and (or) elimination of hydrates. It demands calculations of the optimum concentration and expenses and also the intensity (speed) of hydrates dissociation causing with the reagents.The analytical method of the anti-hydrate chemical reagents efficiency determination containing one or several components from different classes of chemical compounds – alcohols, salts, acids, compounds of nitrogen and oxygen – is presented in this paper. With its help it is possible to define decrease in temperature of hydrate formation from reagents influence, to count key parameters of reagents anti-hydrate efficiency depending on component compositions of hydrate gas and a phase condition of a hydrate-gas system, to select types of chemical components and their quantity in multicomponent reagents, i.e., to make new compounds. The method can be used for express assessment of anti-hydrate chemical reagents efficiency on criteria sign for practical application in oil, gas and processing industry.
Highlights
Для решения этих задач разработан аналитический метод определения эффективности реагентов, содержащих один или несколько компонентов из классов химических соединений – спиртов, солей, кислот, соединений азота и кислорода
Phase equilibria of carbon dioxide clathrate hydrates in the presence of methanol/ethylene glycol + single salt aqueous solutions: Experimental measurement and prediction / H.Najibi, Z.Kamali, A.H.Mohammadi // Fluid Phase Equilibria
Summary
Изменение термических условий образования гидратов где Ma и Mg – молекулярные массы воздуха и газа-гидратообразователя. Расчет величины Tw с точностью до 0,01 K по уравнению (5) может выполняться в диапазоне давлений Ph = 0,00061173 – 212,9 МПа. Величину температуры замерзания водного раствора реагента, состоящего из одного или нескольких химических компонентов, рассчитывают по формуле m. I 1 где X ri – массовая концентрация i-го компонента; Tri – температура кристаллизации воды в разбавленном реагенте, содержащем i-й компонент. Точные значения Tri определяются по справочным данным [7,8,9,10, 15] или по зависимости. Где , β, γ – коэффициенты для некоторых химических компонентов с концентрацией X ri в диапазонах, указанных в табл.
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