The separation of the isomers of perfluorohexane by gas-liquid chromatography is difficult for two reasons: (1) the isomers have similar vapor pressures in that they all boil within a range of one or two degrees, and (2) they all show essentially identical thermodynamic behavior in any given...
As shown in , the enthalpy of adsorption for the two dimethylbutane isomers is essentially identical up to a loading of 0.6 mmol/g. If diffusion is not the primary cause of the separation and the material is saturated at the breakthrough event, the strength of adsorption of these isomers ...
However, the drift times of the rest of the studied saccharides were essentially indistinguishable. These results for the monosaccharide isomers were in agreement with the previous report38. Effect of derivatization reagents. The ion mobility shift reagent strategy was employed to increase the CCSs...
These patterns are markedly identical to the desolvated adsorbent MOF 1, which implies that the sample remains intact after each of the sorption cycles. To check the practical importance of separation, phase 1 was immersed into ternary and quaternary mixture solution of xylenes for 1 h and the ...
The procedure of Example 1 was essentially repeated except that an alternative catalyst was used. In this example 212.3 g (1.5 moles) orthotolidine was dissolved in 637 ml THF and placed in the autoclave. 8.49 g of 5% Rh on alumina catalyst from Engelhard and 2.3 g anhydrous LiOH were add...
In this way we obtained essentiallythe same results as with the much larger correlation-consistant basis set. We are currently unable to providea conclusive explanation as to the differenced betweenthe PUMP2 and the CASSCF results for the triplets.Isodesmic bond separation reactions [31– 33] have...
(18). The steepness of the dimethylbutane breakthrough events suggests that the separations for these isomers result from essentially equilibrium processes and are not diffusion controlled. As shown inFig. 3F, the enthalpy of adsorption for the two dimethylbutane isomers is essentially identical up ...
such as fried, deep-fried, roasted and grilled foods. Some variation in isomer concentrations between commercial and homemade or wheat and rye bread may have been due to differences in fermentation products, as microbial populations were likely not identical in the sourdough used for each of the...