Abstract: A process for the production of chlorine by the electrolysis of aqueous sodium chloride solution in which a gaseous stream containing chlorine and carbon dioxide is passed into a first reaction vessel and thence into a second reaction vessel and aqueous sodium hydroxide solution is charged to the first reaction vessel and aqueous sodium hydroxide solution is separately charged to the second reaction vessel, an aqueous solution containing sodium hypochlorite being removed from the first reaction vessel and an aqueous solution containing an alkali metal carbonate being removed from the second reaction vessel.The process enables saleable alkali metal hypochlorite to be produced which may be substantially free of sodium carbonate, and also aqueous sodium carbonate solution which may be used to precipitate polyvalent metal salts in the purification of the aqueous sodium chloride solution.

Abstract: A thermography machine applies thermography powder to the printed surfaces of sheets. Excess powder is vacuumed from the sheets under the influence of suction generated by a cyclone separator which separates the excess powder from an air stream in which the powder is entrained. A static charge eliminator is provided for neutralizing the electrical charge on the powder particles to facilitate a smooth flow of the particles through the separator. The static charge eliminator includes a plurality of electrical charged pins across which is conducted a flow of outside air which is sucked through the static charge eliminator by the suction pressure from the separator. As the air flows across the charged pins, oxygen is converted to ozone and the ozone is conducted into contact with the powder particles within the separator. The pins have a contoured profile along their length to maximize the ozone-producing process.