SynopsisThe isothermal pyrolysis of 100 mg samples of shredded newsprint, both untreated and 1% HCl washed, a t pressures below 1 torr has been examined between 260°C and 340°C. Pyrolysis occurs via a rapid initial reaction followed by a slower degradation that can he modeled as first order in remaining newsprint. The effect of a 1% HCl wash pretreatment is to increase the fractional tar yield by 40%, to decrease the gas yield by an equivalent amount, and to increase the extent of initial reaction. Arrhenius parameters have been obtained for rate constants describing both the initial and the slower degradation reactions for both untreated and acid washed newsprint.

ii) For h > Dmin/2. The dimensionless foulant volume V{j,h) can be calculated by

The photolysis of ketene at 334 nm, in the presence of cyclobutane and small amounts of oxygen, was investigated at pressures between 297 and 2 Torr at 298 K. Chemically activated methylcyclobutane was formed at energies about 50 kcal/mol in excess of the threshold energy for unimolecular decomposition to propylene and ethylene by the addition of CH2(1Ai) to cyclobutane. The data, plotted as the ratio of propylene yield to methylcyclobutane yield vs. reciprocal collision frequency, showed concave upward curvature indicative of multistep collisional deactivation. In these experiments, cyclobutane was the major collision partner. Theoretical calculations, using RRKM theory and a stepladder deactivation model, showed that the data could be fit by deactivation step sizes in the range 4 to 6 kcal/mol. The dependence of the results on collision number and molecular frequency model for the activated complex were examined in detail.

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The extractlon of fluoslilclc acid from dilute aqueous solutions by high-molecular-weight amines in kerosene has been studied. Extraction equlllbrium curves for various commercial amines are presented for room temperature, an amine concentration of 0.2 M, and aqueous acid concentrations up to 1 M. Formation of stable suspensions, coextraction of water, and aggregation of amine salts are discussed. Amine extraction of fluosilicic acid is compared with that of other mineral acids. The enthalpy, entropy, and equilibrium constant of the reversbble binding of NO to FeI'NTA in an aqueous solutionhave been determined to be AHo = -11.9 kcal/mol, AS = -11.1 eu, and K = 4.6 X lo5 M-' at 50 OC, respectively. The formation and dissociation rate constants of Fe"(NTAXN0) are k 1 7 X 10' M-l s-l a nd k -, 2 35 s-', respectively, at 25 OC. The rate of binding of NO to form the complex is much faster than the mass transfer rate at typical wet scrubber conditions.