Production of chlorine dioxide

Claim 1

APPARATUS FOR PREPARING CHLORINE DIOXIDE WHICH COMPRISES A PRIMARY TUBULAR CHAMBER HAVING ITS LONGITUDINAL AXIS SLIGHTLY INCLINED TO THE HORIZONTAL, SEPARATE INLET PIPES FOR ADMISSION OF LIQUID REACTANT EXTENDING FROM ABOVE INTO THE UPPER PORTION OF SAID INCLINED PRIMARY CHAMBER AT A SUBSTANTIAL DISTANCE FROM THE UPPER END THEREOF, AN OUTLET FOR GAS AT THE UPPER END OF THE PRIMARY CHAMBER, A SECONDARY SUBSTANTIALLY VERTICAL TUBULAR CHAMBER, CONNECTED AT ITS UPPER END TO THE LOWER END OF THE PRIMARY CHAMBER, SAID SECONDARY CHAMBER HAVING AN UPPER PORTION THEREOF OF SUBSTANTIALLY LESS DIAMETER THAN THE LOWER PORTION THEREOF, AT LEAST ONE HELICALLY ARRANGED CONDUIT IN SAID LOWER PORTION ADAPTED FOR THE CIRCULATION OF HEATING FLUID AND HELICALLY EXTENDING THROUGH A SUBSTANTIAL EXTENT OF SAID LOWER PORTION OF SAID SECONDARY CHAMBER AND SO ARRANGED THEREIN AS TO BE ADAPTED TO SUPPORT A BED OF INERT PACKING MATERIAL IN THE UPPER PORTION OF SAID SECONDARY CHAMBER, AND AN INLET FOR INERT GAS AND AN OUTLET FOR REACTION LIQUOR AT THE LOWER END OF SAID LOWER PORTION OF SAID SECONDARY CHAMBER.