Abstract: A filter-press type electrolytic cell comprises alternatively arranging quadrilateral frames and ion-exchange membranes to form alternatively anolyte compartments and catholyte compartments under fastening the frames wherein said frame comprises hollow member for path of liquid and gas which has inlet or outlet at the outer surface thereof and holes at the inner surface thereof and a gas-liquid separator whereby each type of electrolytes is passed into an anolyte or catholyte compartment formed in the frame and the electrolyzed product is discharged from the anolyte or catholyte compartment.

Abstract: A filter-press type electrolytic cell comprising alternatively arranged frames and diaphragms fastened together to form alternating anolyte compartments and catholyte compartments, wherein said frames comprise two oppositely disposed hollow members one of which has an inlet and the other an outlet for the flow of electrolyte solutions said inlet or outlet being on the outside surface thereof and each of said members having holes on the inside surface thereof which surfaces face each other, whereby the appropriate electrolyte is passed from said member having said inlet into the anolyte or catholyte compartment formed in the frame and the electrolyzed product is discharged from said anolyte or catholyte compartment into said member having said outlet.

Abstract: A process for the recovery of oxides of sulfur from combustion waste gases, which comprises cooling said waste gases and forming entrained particles of sodium compounds, consisting essentially of sodium carbonate, by spray contact with sodium hydroxide or sodium carbonate, converting sodium carbonate in the particles to sodium sulfate by passing said oxides of sulphur containing waste gases and said sodium compound particles over plate-like packings, whereby said particles are comminuted to a finer particle size form so as to enhance the reaction of said sulfate particles with the oxides of sulfur in said waste gases, collecting entrained particles of said sodium compounds in a dust collector.