Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

CNMRs membrane reactors

CATALYTIC NON-PERMSELECTIVE MEMBRANE REACTORS WITH AN OPPOSING REACTANTS GEOMETRY (CNMR/ORG)... [Pg.464]

There are, however, some studies demonstrating another concept of using porous membranes. In this concept, the permselective property of a membrane is immaterial and not utilized. Instead, the well sU uctured porous maU ix of the membrane serves to provide a well controlled reaction zone. Specifically, two reactants are fed separately to the opposing sides of a catalytic membrane. For those reactions the rate of which is faster than the diffusion rate of the reactants in the membrane, the reaction can take place inside the caialytically active membrane. This type of membrane reactor, where the membranes are catalytic but not selective, are called catalytic non-pcrmselective membrane reactors (CNMR). [Pg.464]

Based on matenal considerations, membrane reactors can be classified into (1) organic-membrane reactors, and (2) inorgamc-membrane reactors, with the latter class subdivided into dense (metals) membrane reactors and porous-membrane reactors Based on membrane type and mode of operation, Tsotsis et al. [15] classified membrane reactors as shown in Table 3. A CMR is a reactor whose permselective membrane is the catalytic type or has a catalyst deposited in or on it. A CNMR contains a catalytic membrane that reactants penetrate from both sides. PBMR and FBMR contain a permselective membrane that is not catalytic the catalyst is present in the form of a packed or a fluidized bed PBCMR and FBCMR differ from the foregoing reactors in that membranes are catalytic. [Pg.10]

Whether such devices (which is this chapter are referred to by the acronym CNMR, namely catalytic nonpermselective membrane reactors) should be called membrane reactors in the first place will stay a matter of debate among the purists nevertheless these membrane reactors are attracting a growing share of attention with a number of hydrogenation, oxidation and partial oxidation reactions studied. [Pg.531]

A schematic of a reactor made from a nonselective membrane for preventing the slip of an excess reactant is shown in Figure 24.2g. The principle of this reactor was outlined before. In the particular design shown, one of the reactants (5) is continuously recirculated on one side of the membrane so that complete conversion of A can be achieved on the opposite side without any slip. We refer to such a catalytic nonselective membrane reactor without packing as a CNMR-E. When packed, it is referred to as a CNMR-P. Another nonselective... [Pg.769]

Catalytic nonselective membrane reactor with no packing (CNMR)... [Pg.412]

Figure 13.2 Types of membrane reactors, (a) IMR-P, (b) IMMR-P, (c) hollow membrane tube reactor with catalyst in shell (another version of IMR-P), (d) fluidized-bed Inert selective membrane reactor (IMR-F), (e) CMR-E, (f) CMR-P, (g) catalytic nonreactive membrane reactor (CNMR-E), (h) catalytic nonselective hollow membrane reactor (CNHMR-E) for multiphase reactions G = gas, L = liquid, and (i) immobilized-enzyme membrane reactor (lEMR). (Adapted from Shao, X., Xu, S., and Govind, R AlChE Symp. Ser., 268, 1, 1989.)... Figure 13.2 Types of membrane reactors, (a) IMR-P, (b) IMMR-P, (c) hollow membrane tube reactor with catalyst in shell (another version of IMR-P), (d) fluidized-bed Inert selective membrane reactor (IMR-F), (e) CMR-E, (f) CMR-P, (g) catalytic nonreactive membrane reactor (CNMR-E), (h) catalytic nonselective hollow membrane reactor (CNHMR-E) for multiphase reactions G = gas, L = liquid, and (i) immobilized-enzyme membrane reactor (lEMR). (Adapted from Shao, X., Xu, S., and Govind, R AlChE Symp. Ser., 268, 1, 1989.)...
Catalytic non-selective membrane reactor The membrane is not selective but serves as a catalytic site for reactions CNMR... [Pg.24]

In some applications the membrane is not required to be perm-selective but only to provide reactive sites. Such devices are called catalytic non-perm-selective membrane reactors (CNMRs). The reactants can flow into the membrane from opposite sides, and the membrane s role is to provide a controlled reactive interface. If the reactants flow through the membrane from one side to the other while the reaction takes place instantly, such a reactor is also called a flow-through catalytic membrane reactor (FTCMR). [Pg.25]

Non-permselective CMR - In this type of reactor (sometimes called a CNMR), the membrane plays no separative role, but simply provides a location for the establishment of a reaction zone. This is shown schematically in Figure 5 for the reaction A + B P. One reactant (B) is fed on the tube side of the membrane, and the other reactant (A) is fed on the shell side. The partial pressure gradients set up cause them to permeate toward each other inside the membrane, where they react. [Pg.51]


See other pages where CNMRs membrane reactors is mentioned: [Pg.217]    [Pg.10]    [Pg.532]    [Pg.546]    [Pg.8]    [Pg.9]    [Pg.186]    [Pg.192]    [Pg.197]    [Pg.85]    [Pg.126]    [Pg.782]    [Pg.221]    [Pg.248]    [Pg.424]    [Pg.528]    [Pg.345]    [Pg.550]   


SEARCH



CNMR

CNMRs

© 2024 chempedia.info