Membranes Propylene data

Fig. 22. Catalytic activities of Mo03, Bi203, and bismuth molybdates for the oxidation of propylene to acrolein. ( ) Under usual catalytic conditions. (O) In the absence of gaseous oxygen. Active oxygen is supplied through an oxygen transfer membrane. Data were taken from (118).

Examples of the best results obtained are shown in Figure 11.21 [33,61], The composite membranes with which these data were obtained were formed by casting a solution of 80 wt% silver tetrafluoroborate in a propylene oxide copolymer matrix onto a microporous support. When subjected to a 40-day test with a gas... 

The propylene isotherm is reported to be very similar. Based on these data, silver salt membranes are best used with pressurized ethylene feed streams pressures of 3-6 atm are generally used. The Standard Oil work was continued for a number of years and was taken to the pilot-plant stage using hollow fiber... 

FIGURE 9.17 Dependence of productivity and separation factor /3p C6H5CH3/H2O of membranes based on various rubbery polymers on the glass transition temperature of the polymer (pervaporation separation of saturated toluene/water mixture, T = 308 K) (1) polydimethyl siloxane (2) polybutadiene (3) polyoctylmethyl siloxane (4) nitrile butadiene rubber with 18% mol of nitrile groups (5) the same, 28% mol of nitrile groups (6) the same, 38% mol of nitrile groups (7) ethylene/propylene copolymer (8) polyepichlorohydrin (9) polychloroprene (10) pol3furethane (11) polyacrylate rubber (12) fluorocarbon elastomer. (From analysis of data presented in Semenova, S.I., J. Membr. Sci., 231, 189, 2004. With permission.)... 

In 2009 Scovazzo published a significant paper where literature data obtained using the proposed model to predict gas solubility and gas permeability was summarized, along with adding new data, on the SILMs membranes permeabilities and selectivities for the gas pairs CO2/N2, CO2/CH4, O2/N2, ethylene/ethane, propylene/propane, 1-butene/butane, and 1,3-butadiene/butane, with the object as to serve as guide for future researches in this area. 

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