The possibility of utilizing peat as adsorbent for removal of the pesticide 2,4‐D from contaminated wastewaters has been evaluated in this investigation. Batch tests were conducted at different conditions of initial solute concentration, pH, particle size of adsorbent, temperature and ratios of weight of adsorbent to solution volume, in order to determine the optimum range of these variables for the adsorption operation. Removal ratios for the 2,4‐D of the order of 90% were obtained under optimum conditions. The adsorption of 2,4‐D in peat is described adequately by the Freundlich isotherm. Continuous tests, utilizing adsorption columns, were then conducted in order to determine the design parameters for a proposed treatment plant. The column tests were adequately correlated by the Bohart‐Adams equation.

An additive group technique for calculation of ideal gas heat capacities is proposed. Testing with hydrocarbons at several temperatures reveals that this technique is more accurate than any now appearing in the literature.

Excess enthalpies in the gas phase for the ethylene‐carbon dioxide system have been measured by a continuous‐flow isothermal calorimeter. Excess enthalpies are presented for mol fractions ranging from approximately 0.15 to 0.85, at three temperatures: 298.15, 318.15 and 338.15 K. For each isotherm, measurements were made at four pressures: 1.036 MPa (150 psia), 2.072 MPa (300 psia), 3.454 (500 psia) and 4.835 MPa (700 psia). The experimental results are compared with predictions using the Benedict‐Webb‐Rubin and Redlich‐Kwong equations of state.

Heats of mixing for 21 ternary systems of one n‐alkane + two n‐alcohols are reported at 25°C. Evaluation of four equations permitting the prediction of heats of mixing of ternary systems from binary data is made. Scatchard's modified equation for systems containing a polar component was found to be the most accurate.

Enthalpies of mixing for the binary gaseous system methane-carbon dioxide were measured by an Isothermal flow calorimeter at temperatures of 293.15, 305.15, and 313.15 K, with mole fractions of methane ranging from approximately 0.2 to 0.8. For the first two Isotherms, the measurements were made at pressures of 0.507, 1.115, and 1.520 MPa (5, 11, and 15 atm, respectively). For the third Isotherm, measurements were made at pressures of 0.