(Surfactant+polymer) interaction parameter studied by (liquid+liquid) equilibrium data of quaternary aqueous solution containing surfactant, polymer, and salt

Isothermal vapour-liquid equilibrium data at 65, 73 and 80 °C and isobaric ones at 101.3 kPa were measured in the tetrachloromethane-sec-butyl alcohol system. A modified circulation still of the Gillespie type was used for the measurements. Under the conditions of measurement, the system exhibits positive deviations from Raoult's law and minimum boiling-point azeotropes. The experimental data were fitted to a number of correlation equations, the most suitable being the Wilson equation.

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Vapour-liquid equilibrium in the ternary system cyclohexane-acetic acid-propionic acid

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19892840 ◽

1989 ◽

Vol 54 (11) ◽

pp. 2840-2847 ◽

Cited By ~ 1

Author(s):

Ivona Malijevská ◽

Alena Maštalková ◽

Marie Sýsová

Keyword(s):

Acetic Acid ◽

Ternary System ◽

Propionic Acid ◽

Activity Coefficients ◽

Error Propagation ◽

Analytical Techniques ◽

Liquid Equilibrium ◽

Consistency Test ◽

Propagation Law ◽

Equilibrium Data

Isobaric equilibrium data (P = 101.3 kPa) for the system cyclohexane-acetic acid-propionic acid have been measured by two different analytical techniques. Activity coefficients calculated by simultaneous solving of equations for the chemical and phase equilibria were subjected to a consistency test based on inaccuracies determined from the error propagation law, and were correlated by Wilson’s equation. The activity coefficients measured were compared with those calculated from binary vapour-liquid equilibrium data and with values predicted by the UNIFAC method.

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Adsorption Characteristics of Phenol in Aqueous Solution by Pinus massoniana Biochar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.1154 ◽

2013 ◽

Vol 295-298 ◽

pp. 1154-1160 ◽

Cited By ~ 3

Author(s):

Guo Zhi Deng ◽

Xue Yuan Wang ◽

Xian Yang Shi ◽

Qian Qian Hong

Keyword(s):

Aqueous Solution ◽

Ph Value ◽

Pinus Massoniana ◽

Isotherm Models ◽

Order Kinetic ◽

Adsorbent Dosage ◽

Salt Ions ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

The objective of this paper is to investigate the feasibility of phenol adsorption from aqueous solution by Pinus massoniana biochar. Adsorption conditions, including contact time, initial phenol concentration, adsorbent dosage, strength of salt ions and pH, have been investigated by batch experiments. Equilibrium can be reached in 24 h for phenol from 50 to 250 mg• L-1. The optimum pH value for this kind of biochar is 5.0. The amount of phenol adsorbed per unit decreases with the increase in adsorbent dosage. The existence of salt ions makes negligible influence on the equilibrium adsorption capacity. The experimental data is analyzed by the Freundlich and Langmuir isotherm models. Equilibrium data fits well to the Freundlich model. Adsorption kinetics models are deduced and the pseudo-second-order kinetic model provides a good correlation for the adsorbent process. The results show that the Pinus massoniana biochar can be utilized as an effective adsorption material for the removal of phenol from aqueous solution.

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