Intermediate product yield enhancement with a catalytic inorganic membrane; I. Analytical model for the case of isothermal and differential operation

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Harold, M.P. and Zaspalis, V.T. and Keizer, K. and Burggraaf, A.J. (1993) Intermediate product yield enhancement with a catalytic inorganic membrane; I. Analytical model for the case of isothermal and differential operation. Chemical Engineering Science, 48 (15). pp. 2705-2725. ISSN 0009-2509

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Abstract:A simple model is developed to examine the performance of a supported catalytic membrane within which occurs the consecutive-parallel reaction system given by A + B → R, with RATE = k1pA1ApBB, and A + R → P, with RATE = k2pA2ApRR. Closed-form solutions reveal that segregation of reactants A and B to opposite sides of the membrane is an effective strategy for increasing the desired product (R) point yield. However, increases in the component R yield come at the expense of the point catalyst utilization, due, in part, to depletion of reacting components B and R. The membrane performance is sensitive to the relative reaction orders with respect to component A for the special case in which the rates are zeroth-order with respect to B and R (B = R = 0). The segregation strategy is shown to be most beneficial if three requirements are met: (i) A1 < A2, (ii) k1, k2 sufficiently large and (iii) active layer sufficiently thin compared to support. Under favorable conditions [requirements (i)-(iii) met], component R is selectively produced near the active layer surface, and diffuses out of the membrane before further reaction to undesired product (P). The simulations indicate that the fractional increases in the R yield attained, as the degree of segregation is increased, exceed the fractional decreases in catalyst utilization. A secondary benefit of the membrane design is the confinement of reaction products in the bulk stream on the active layer side, thus reducing the downstream separation needs.
Item Type:Article
Copyright:© 1993 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/12641
Official URL:http://dx.doi.org/10.1016/0009-2509(93)80183-Q
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