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

By Yatish T. Shah

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Sample text

A plot of ALir p versus C Ln would, once again, give (KSAas)-t as ordinate. In the above equation, I1A is the catalyst effectiveness factor for hydrogen and KsQs is the liquid-solid volumetric mass-transfer coefficient for hydrogen. Reuther and Puri 145 applied the above methods to hydrogenation of allyl alcohol in the solvents water and ethanol and fumaric acid in ethanol. Raney nickel was used as a catalyst for both systems. If a transport parameter Tc = Cs/C L is defined, where C s is the concentration of C at the catalyst surface, then Peterson 134 showed that for gas-solid reactions 'Ie < Te, where IJc is the catalyst effectiveness factor for C.

H 20 + C03 -(aq) . (2-65) The system is further discussed by Juvekar and Sharma. V For this case, the absorption rate is given b/ 3 9 Aa De - + - Cs H DA R - - -,------- - -----::-AI 1 Dc 1 . (2-66) - - + - - + - -HkGAL DA Ksas kLaL The concentration distributions of A and B for this case are illustrated in Fig . 2-11. , (2-67) dp « trri)L. V? Here Ksas D;, 2 4k LD c b 1 ». (2-68) 44 GAS -LIQUID-SOLID REACTOR DESIGN Reaction plane c Gas-liquid interface Liquid-solid interface .. FiKure 2-11 Concentration distributions of A and R in the case of an insta ntaneous reaction.

3. Gas-liquid-solid reactions with solid as a reactant. Here we briefly review each of these reaction separately. 2-2-1 Gas-Liquid Reactions The most basic type of gas-liquid reaction is K A (g) + ZC (I) ~ B (I). (2-6) 26 GAS-LIQUID-SOLID REAClDR DESIGN This reaction can occur in slow, fast, or instantaneous reaction regimes. ga~~phase resistance can be important, dependingon "t he concentration of the ' reactant "the gas phase and the solubility of the gas in the liquid phase. The criteria for these reaction regimes are 2 4 .

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