Patent ID: 8784733

Claim:
A chlorine dioxide generation system, comprising: a reactor column; a source of sodium hypochlorite reactant at a concentration of less than about 6% by weight fluidly connected to the reactor column; a source of hydrochloric acid reactant fluidly connected to the reactor column; a source of sodium chlorite reactant fluidly connected to the reactor column; a pH sensor configured to detect a pH condition associated with the reactor column; a controller, in communication with the pH sensor, configured to adjust a flow rate of at least one reactant to the reactor column in response to a detected pH condition deviating from a pH range preselected to favor formation of chlorine dioxide in a mixed oxy-chloro product stream; a premixing chamber positioned upstream of the reactor column and fluidly connected to the source of hydrochloric acid and the source of sodium hypochlorite, wherein the pH sensor is positioned downstream of the premixing chamber and upstream of the reactor column; and a mixed oxy-chloro product stream outlet.