Mass transfer—the Skovborg-Rasmussen model

Skovborg and Rasmussen (1994) studied the Englezos-Bishnoi model and noted two restrictions in addition to limitations 2 and 3 in the last section  

The secondary nucleation constant was very low (10-3) suggesting that no secondary nucleation exists, and that all particles were of the same size and grow at the same rate. Therefore, Skovborg and Rasmussen suggested that the crystallization population balance could be removed from the model. 

The above observations encouraged Skovborg and Rasmussen to simplify the Englezos-Bishnoi model. They assumed that the entire hydrate process could be modeled as a mass transfer restriction of the gas through the liquid film at the gas-liquid interface. As such, their model reduced the number of differential equations to a single equation  

Vint = bulk liquid mole fraction of the component. 

Skovborg re-analyzed the Englezos kinetic data and obtained mass transfer coefficients of4.076 x 10-5 and 5.457 x 10-5 m/sforCH4 and C2H6, respectively. 

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