Hinterland ratio

Westerterp derived an equation for this degree of utilization r/i of the reaction (liquid) phase based on Ha and the dimensionless Hinterland ratio Hi (Westerterp, van Swaaij, and Beenackers, 1998) ... 

Figure 4.4.5 Influence of the Hinterland ratio (Hi) and the Hatta number (Ha) on the concentration profile in the liquid mass transfer film for a first-order reaction of gaseous reactant A according to Eqs. (4.4.35) and (4.4.28).

The utilization degree approaches unity, if the Hinterland ratio is less than about 10 ... 

Figure4.4.6 Influence of the Hinterland ratio (Hi) and Hatta number (Ha) on the degree of utilization ofthe liquid phase (ST spray tower, CP column with packing, CT column with trays, STR stirred tank reactor, BC bubble column region above dashed line more than 80% of conversion takes place in the bulk phase of the liquid). Adapted from Emig and Klemm (2005).

Gas-liquid reactions are governed by dimensionless numbers, namely, the Hatta number Ha, which reflects the ratio of the reaction rate to the rate of mass transfer, and the Hinterland ratio Hi, which is the ratio of the volume of the liquid phase to the liquid film volume. 

The parametOT indicates the ratio between the volumes of the bulk and the diffusion layer. It is sometimes called the "hinterland ratio". The diffusion layer is defined arbitrarily as in eq. (5.40) 5 =... 

Figure 5A3. The enhancement factor E for gas absorption with chemical reaction, as a function of the Hatta number (9), for various values of the hinterland ratio ( 6), according to eq. (5A.10).

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