Trimethylpentane, adsorption

Fig. Ill-16. Surface tension lowering of water at 15°C due to adsorption of hydrocarbons. , n-pentane A, 2,2,4-trimethylpentane O, n-hexane x, n-heptane A, n-octane. (From Ref. 133.)...

Fig. 3.24 Test of the tensile strength hysteresis of hysteresis (Everett and Burgess ). TjT, is plotted against — Tq/Po where is the critical temperature and p.. the critical pressure, of the bulk adsorptive Tq is the tensile strength calculated from the lower closure point of the hysteresis loop. C), benzene O. xenon , 2-2 dimethyl benzene . nitrogen , 2,2,4-trimethylpentane , carbon dioxide 4 n-hexane. The lowest line was calculated from the van der Waals equation, the middle line from the van der Waals equation as modified by Guggenheim, and the upper line from the Berthelot equation. (Courtesy Everett.)...

Hydrolysis oftricaprylin in trimethylpentane by Fusarium solani pisi recombinant cutinase immobilized on various zeolites (NaA, NaX, NaY, LZY-82, dealuminated Y) was investigated in order to assess the effect of chemical composition (Si/Al ratio), hydrophilic character and acidity on the catalytic activity [221]. The adsorption of... 

Silica-supported triflic acid catalysts were prepared by various methods (treatment of silica with triflic acid at 150°C or adsorption of the acid from solutions in trifluoroacetic acid or Freon-113) and tested in the isobutane-1-butene alkylation.161 All catalysts showed high and stable activity (near-complete conversion at room temperature in a continuous flow reactor at 22 bar) and high selectivity to form saturated C8 isomers (up to 99%) and isomeric trimethylpentanes (up to 86%). Selectivities to saturated C8 isomers, however, decreased considerable with time-on-stream (79% and 80% after 24 h). 

TPA characteristics of two adsorbers of honeycomb type for various hydrocarbons were evaluated. In this study, methyl alcohol, acetone, acetaldehyde, 224 trimethylpentane, n-octane and toluene were chosen as the hydrocarbons of cold start. The effect of the hydrocarbon components and oxygen concentration on TPA behavior was studied. According to the precious metal loading and the presence of Ch, the adsorption and desotptioit amount were decreased, while the conversion efficiency of hydrocarbons was increased. In case of hydrocarbons with oxygen, the thermal decomposition appeared to be in the order of methanol, acetaldehyde and acetone. 

TPA curves of 224 trimethylpentane on HA 4 according to different O2 concentrations are shown in Figure 4. According to the increase of O2 concentration, the adsorption amount of 224 trimediyipentane was decreased little, but the hydrocarbon conversion stated at the lower temperature and was advanced over 460 K. 

Figure 1 shows experimental and predicted TPA results for single component on LOC 1. Hydrocarbon used was 224 trimethylpentane and toluene. Fluid velocity (7.57E-2 m/s) and concentration of supplied O2 concentration (0.18 kPa) for each hy ocarbon were same. In the result of adsorption equilibrium, the amount of toluene adsorbed seemed to be higher than 224 trimethylpentane. As can be expected, toluene was emitted more lately. However, Toluene was converted more rapidly than toluene over 380 K. 

Total concentration of two hydrocarbons in gas phase was 2000 ppm (0.2 kPa). The mole fraction of 224 trimethylpentane and toluene was assumed of 0.5 and 0.5, respectively. The concentration of supplied O2 concentration was 0.18 kPa, and the velocity was 7.57E-2 m/s. In all cases, 224 trimethylpentane was emitted first, but the reaction was started lately. It matches to the results of adsorption equilibrium and conversion experiments. The proposed model described the experimental data properly. 

Considering the iso-alkanes series next, here the Qa values for iso-pentane and 2,2-dimethylbutane coincide well with those for n-pentane and n-hexane, while the values for 2,4-dimethylpentane and 2,2,4-trimethylpentane are considerably less than the corresponding values for n-heptane and n-octane. This effect can also be explained consistently using the concept of the adsorption in long surface micropores the mean van der Waals cross-sections for the first two adsorbates (0.51 nm) differ only slightly from that... 

Nonpolar eluents (2,2,4-trimethylpentane and isopropyl ether) and polar eluents (methanol and acetonitrile) eluted the oligomers more slowly than chloroform by a factor of two. It is clear that these eluents cause separation to be controlled by an adsorption mechanism with a negligible size exclusion effect. Using these eluents, we observed peak separation or broadening due to the diastereomers for the dimer and higher oligomers. 

---