Abstract: An apparatus and method for generating chlorine dioxide. Reagents are introduced into the lower end of a reaction column through "V" inlets. The reagent column surrounds a center column through which motive fluid moves upwardly into a nozzle and venturi throat to produce a zone of reduced pressure at the upper end of the reaction column. The reagents move upwardly through the column interacting throughout 360.degree.. Reaction product exits the generator through the venturi throat.

Abstract: The present invention uses a new approach to generating chlorine dioxide. This approach is the use of two vessel system in which the first vessel is of a structure which enables operation to create substantially isothermal incomplete reaction conditions and in which the second vessel is of a structure to enable operation to generate a continuous decreasing temperature gradient from bottom to top thereof for substantially-completing that reaction.

Abstract: An improvement is provided in a process for the preferential removal of chlorine from an aqueous solution of chlorine dioxide and chlorine which has been prepared by the process of reducing a chlorate with a reducing agent in a strong acid, and wherein the gases produced thereby are dissolved in water. The improvement comprises the step of adding hydrogen peroxide, oxalic acid or a salt of oxalic acid, to a cool (i.e. at a temperature of about 0.degree. C. to about 25.degree. C.) aqueous solution of the chlorine within a period of less than 2.5 hours dioxide and chlorine. Substantially all of the chlorine is destroyed with almost no destruction of the chlorine dioxide.

Abstract: A superior catalyst for the oxychlorination of C.sub.2 hydrocarbon feeds comprises a mixture of copper chloride and alkali metal chloride, for instance, potassium chloride, and preferably also magnesium chloride, which mixture is deposited on an alumina support having a surface area in excess of 20 and less than 100 m.sup.2 /g. The thermal stability of such a catalyst composition can be further improved by incorporating 0.2 to 5 percent silica in the alumina support. The use of such microspheroidal catalyst in the production of perchloroethylene and trichloroethylene by oxychlorination of a C.sub.2 hydrocarbon feed in a fluidized bed reactor results in particularly good process efficiencies in terms of high HCl conversion, and good flexible selectivity to specifically desired product, reduced burning, long on-stream times, and relatively low corrosion rates.