Gas-liquid-solid Reactor Design by Yatish T. Shah

By Yatish T. Shah

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9 2 ,/ " " .... ' - - 10 weight percent solids ·E E , "" <: "u<: --- No solids " ,," ,," 0 U 40 0 Distan ce (em x 104 ) Figure 2-13 Typical concentration profiles for A a nd C in the presence a nd absence o f solids (instantaneous reaction between A and C). 54 GAS-LIQUID-SOLID REACTOR DESIGN (b) The answer for this part can be obtained in the same manner as in part (a). The rate of absorption for zero solids concentration can be obtained from Eq. (2-101) . The final results for the absorption rate and the distance of the reaction plane from the gas-liquid interface are described in Tables 2-4 and 2-5, respectively.

Although each of these models gives a somewhat different physical picture of the reaction process, in many instances the final desired answer for the rate of absorption of gas in the presence of a liquid- or a solid-phase reaction is similar. Since film and penetration theories are most widely used, we review their applications here. l " who obtained his idea from the Nernst"!? concept of the diffusion layer. It was first applied to the analysis of gas absorption accompanied by a chemical reaction by Hatta.

The solvents used are of varied chemical nature. Several experimental systems, such as absorption of C1 2 , NH 3 , and phosgene in water, hydrogen sulfide in aqueous buffer solutions, and oxygen in glucose solution have been extensively examined with the help of penetration and/or film models . Others, such as absorption of CO 2 in amine solution and hydrochlorination of octyl and dodecyl alcohols have been only either partially examined or not subjected to a significant theoretical evaluation.

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