13X pellet

Commercial sodium zeolite sample (13X pellets, 1/16 ) was ion exchanged with a 0.015M copper(II) acetate solution at room temperature for 1 hour. After drying, the sample was ceramized at high temperature (1. ramp up to 800°C at 10°C/min 2. dwell... 

Dependence of Conversion on Monomer Concentration. At a fixed concentration of 13X pellet zeolite, the rate of polynKrization increases with increase in N-vinyl carbazde concentration. This is borne out by the results of Table 13. The usual log Rp vs log [M] plot (Fig. 11) indicates a monomer exponent of 1.53. This is dharacteristicaUy distinct from what is observed in the conventicmal cationic polymerization of this monomer by aprotonic add catdyst where the order is con-astently unity at low monomer range there after decreasing with further increase of the monon r concentration. 

Adsorbents were synthetic zeolites 5A and 13X, manufactured by Linde, as well as an hydrogen mordenite manufactured by C.E.C.A. (Carbonisation et Charbons Actifs, Paris) the samples were in pelletized form and contained 20 wt % binder. From crystallographic data for zeolites 5A and 13X (19) and H-mordenite (20), W0 values were computed and corrected for the presence of the binder these Wo values appear in Table I. In the same way, we also studied a microporous carbon (Cecalite)... 

Pure component loadings for CO2, N2 and O2 on commercial pelleted forms of Linde type 4A, 5A and 13X molecular sieve zeolites were derived from various gravimetric and volumetric measurements. The range of pressures and temperatures over which these measurements were made were at least as broad as those encountered in the breakthrough experiments described here, to permit accurate estimations of heats of adsorption in the manner described by equation (6) above. As mentioned above, the pure component data were correlated to the LRC model, and the CO2 loadings predicted by the multicomponent LRC model compared to actual loadings in the breakthrough runs at bed saturation. 

Figure 12 shows a similar degree of improvement of the dependence of MTZ length of feed temperature. Again derived from C02/air/13X 1/16" pellet systems, the runs consisted of two sets of three breakthrough runs, with feed temperature being the only parameter varied in the set, but with slightly different conditions for either set. 

A 2-L, round-bottom flask is charged with 500 mL of a 0.06 M aqueous solution of potassium permanganate, and 20 g of Linde 13X molecular sieves (1/16-in. [0.16-cm] pellets) is added in one portion. The water is removed under reduced pressure in a rotary evaporator, and the coated pellets are separated from the nonadsorbed potassium permanganate by screening (20 mesh). The reagent contains 0.27 mmol of potassium permanganate per gram. 

Specifications. The sieves most widely used, Types 3A,4A, 5A, and 13X, are all available as powder, A-in. pellets, and i-in. pellets type 4A sieves are available also in beads of three sizes. 

When higher-temperature heat is available, other systems are possible. A school in Munich, Germany, dehydrated 7 metric tons of zeolites using 130°C steam in the district heating system during off-peak hours, then passed moist air over them in the day to recover the heat.201 Pellets of calcium hydroxide containing zinc, aluminum, and copper additives were dehydrated to calcium oxide using solar heat from a solar concentrator then the reaction was reversed to recover the heat.202 Zeolite 13X has been used to store carbon dioxide obtained from the decomposition of calcium carbonate at 825°C (15.2).203 Such temperatures are available with solar furnaces (where a whole field of mirrors focus on the reaction vessel). 

FR studies of carbon dioxide, propane and ammonia in 4A, 5A and 13X commercial pellets [77] have, also, been carried out and the results showed... 

Fig. 20 Pellet size dependence of macropore diffusion time constant for isobutane diffusion in 13X (cf. [65]) pellets ( ) and CO2 diffusion in 5A (cf. [65]) pellets (o) at 423 K obtained using a model discussed in Sect. 3.2.5...

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