Ternary liquid-liquid equilibrium data for the systems sulfolane-toluene-pentane and sulfolanebenzene-pentane were obtained at 17, 25, and 50 °C. Experimental tie line data were measured by gas chromtographic analyses and correlated with the nonrandom two liquid (NRTL) and universal quasi-chemical (UNIQUAC) equations.Ternary liquid-liquid equilibrium data are essential for the design of liquid-liquid extraction processes and for the selection of solvents. Sulfolane (tetramethylene sulfone) is widely used as a solvent in the recovery of high-purity aromatics, such as benzene, toluene, and xylenes, from refinery process streams (Deal et al., 1959; Voetter and Kosters, 1966;Broughton and Asselin, 1967). Although relatively little quantitative phase equilibrium data on sulfolane have been published (Hartwig et al., 1955;

A study involving measurement and analysis of adsorption of common bile acids, namely cholic, deoxycholic, and lithocholic acids, on cereal type dietary fibers was conducted. the selected food fibers were oat fiber, rice fiber, barley fiber, corn bran, and wheat bran, which are all extensively used in processed foods. the adsorption data were measured at 37C and 25C, which correspond to approximate human body and room temperatures. Influence of particle size reduction, due to grinding, on a fiber's bile acid binding capacity was examined by using macro size (35–60 mesh) and micro size (100–300 mesh) fibers as adsorbents. the investigation also included the effects of medium pH and the chemical composition. the experimental data were correlated with the Langmuir and the Freundlich isotherms in order to utilize the data in future predictions and simulations. It was found that the particle size reduction, accompanied by surface area increase, has a significant influence on the adsorption capacity of the fiber. Macro size fibers adsorbed the same bile acid with the following trend: oat > barley > rice > wheat > corn; while micro size fibers followed a somewhat different trend: rice > barley > oat > wheat > corn. This was due to the surface area change after grinding, and a positive correlation between the surface area and the adsorption capacity was observed in each case. the adsorption was favored by acid pH surroundings, and it was positively correlated with the hydrophobicity of the bile acid. were adsorbed on the same fiber with the following trend: lithocholic acid > deoxycholic acid > cholic acid. Fibers adsorbed more bile acid at 25C than they did at 37C. However, the increase in the uptake capacities were not very signipcant.

No abstract

No abstract

No abstract