Purification systems and methods for carbon dioxide production

A method of purifying a mixture from an ethylene glycol plant that comprises (CO2) and (2) other material, wherein the other material includes an organic chloride, the method comprising:

• flowing the mixture to a reactor;
• flowing oxygen (O2) to the reactor;
• reacting at least some of the organic chloride with the O2 to form additional CO2;
• flowing an effluent from the reactor;
• automatically controlling the amount of the organic chloride reacted in the reactor by maintaining reaction temperature in the reactor within a predetermined range, the controlling comprising:
• automatically injecting an external hydrocarbon comprising methane, ethylene and other fuel gas into the mixture, wherein the automatically injecting comprises:
• automatically measuring the effluent's temperature;
• if the measured temperature of the effluent is below a predetermined minimum temperature, automatically activating a control valve to allow flow of, or increase a rate of flow of, the external hydrocarbon into the mixture;
• and
• if the measured temperature of the effluent is above a predetermined maximum temperature, automatically activating the control valve to stop flow of, or reduce flow of, the external hydrocarbon into the mixture.