Concurrent Absorption of Heavy Hydrocarbons

An absorbent is introduced in the form of fine drops into the flow of a multicomponent gas mixture moving in a pipe of constant cross section. Let us suppose that all drops have the same radius R, and the composition of the liquid phase is given either by mass concentrations of components (hg/m ), or by their molar fractions Pressure p and temperature T of gas in the pipe are given, and they 

Let p l be the current mass concentration of t-th component in the drop, -mass concentration of i-th component in the gas at the drop boundary, - mass concentration of i-th component in bulk of the gas flow. Since the volume concentration of absorbent in the gas is small, it is safe to assume that in course of mass exchange, drops of absorbent do not exert any noticeable influence on each other. 

Equations describing the change of component concentrations in liquid and gaseous phases, and the change of the drop volume V, are similar to Eqs. (16.63) to (16.65)  

Here pi and pQ are the phase densities U is the gas velocity in the tube Pi = PiC - PiCw, is the tube diameter. 

For the initial conditions, we take = pj Q, p = p o, V = Vb, where pjco are mass concentrations of components in the gas flow before the input of the absorbent, and pno are mass concentrations of components in a freshly prepared absorbent. 

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Multistage Concurrent Absorption of Heavy Hydrocarbons 645 Table 20.3 Initial composition of the gas and the absorbent (molar fraction %). 

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