Trihalogen-Methyl Reactions. Iii. The Use of the Silver Cathode in Electro-Deposition of Copper.

Abstract

With the higher concentration the effect of polymerization is Yery great in cutting down the vapor pressure, and the distillates are always weaker.There is, therefore, a certain concentration of total formaldehyde at which the amount of simple molecules in equilibrium with the complex ones stays nearly constant with the slowly rising temperature, and since the \yapor pressure is dependent almost entirely upon the simple molecules and not the polymer the vapor pressure will be constant and the material will distill 01-er of a constant composition. With concentrations above l5Y0 the formaldchydc is there chiefly as a polymerized form and therefore its vapor pressure is much lower than it would be if it were there as simple molecules. The result is as shown; the distillate is weaker than the original, although the total amount of formaldehyde present is larg:c* a s shown by the high percentage in the residue. Conclusions.1. Distillation curves for solutions of various conccntrations of formaldehyde in water have been determined.

Potential Explosion Hazards Associated with the Autocatalytic Thermal Decomposition of Dimethyl Sulfoxide and Its Mixtures

“…The author noted that the addition order and relative concentration of reactants were important factors in the intensity with which the reaction took place. An analogous Doughty−Freeman reaction, 71 in which copper wool was added to a 10% solution of trichloroacetic acid in aqueous ammonia (1:1 concentrated ammonia/water) instead of DMSO, progressed smoothly when performed by Dunne and Scott. 72 However, the addition of copper wool to trichloroacetic acid in DMSO did result in an exothermic reaction when repeated by Dunne and Scott, although a runaway reaction did not occur.…”