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The free-water problem

2016-11-03View Original

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In the calculation of free water in Aspen’s vapor-liquid system, there are three methods for determining the activity coefficient of water in hydrocarbons: the first method is the reciprocal of the solubility of water in hydrocarbons; The second is expressed as a function of temperature and composition ; The third is to specify it directly as 1. May I ask: is the second one expressed as a function of temperature and composition, in the form of an equation? Should we still use the activity coefficient model for calculation? The third method is directly specified as 1. Is it correct to state that the solubility of water in hydrocarbons is very low, at 1?

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