Patent ID: 9656891
Date: 2017-05-23
CPC Classifications: A01N,C02F,C09K

Claim:
1. An automated process for the safe and efficient generation of a dilute aqueous solution of chlorine dioxide having a variable chlorine dioxide mass flow rate of at least 1 to 200 turn-down turn-up ratio, said aqueous solution is applied to oil and gas applications, the process comprising: a source of motive water in fluid contact with a variable mass flow rate chlorine dioxide generating system comprising: variable feed rate chemical pumps, chemicals for producing chlorine dioxide, flow meter, flow regulating valve, injection manifold, a reaction zone (reactor), pH sensor for monitoring the reactor effluent pH, and an optional optical sensor for measuring chlorine dioxide concentration exiting the reactor; a control panel comprising a PLC programmed with turn-down turn-up logic and assigned a minimum ClO the PLC applies turn-down turn-up logic to vary the mass flow rate of chlorine dioxide in the motive water to produce a dilute aqueous solution of chlorine dioxide by: (1) varying the concentration of chlorine dioxide by changing the feed rate of the chlorine dioxide generating system chemical pumps while controlling the motive water flow rate to target a predetermined value, and (2) changing the motive water flow rate to target a new predetermined value followed by changing the chemical feed rate of the chlorine dioxide generating system chemical pumps to vary the concentration of chlorine dioxide; the variation in mass flow rate of chlorine dioxide is achieved while the concentration of chlorine dioxide exiting the chlorine dioxide generator is controlled between the minimum ClO applying the dilute aqueous solution of chlorine dioxide to an oil and gas application.