Method and system for continuous monitoring and control of entchlorisierungsrückständen in a current ethyl 1-cyclopropyl-7-fluoro-8-trifluoromethyl-1,4-dihydro-4-oxo-3-quinolinecarboxylate

摘要

A method and system for directly monitoring and controlling a continuous process stream 12 for dechlorination residual is provided. A sample stream 18 to which a dechlorination agent has been added to completely eliminate a residual disinfectant, is continuously drawn off. An analyzing agent 36, different from the disinfectant, in an amount in excess of that needed to completely react with the dechlorination residual, is added to the sample stream to leave an unreacted amount of analyzing agent. Sufficient time is provided for the analyzing agent to completely react with the dechlorination residual. Thereafter, the sample stream is continuously analyzed to determine the amount of unreacted analyzing agent remaining in the process sample. Based on the amount of analyzing agent added to the process sample and the amount of unreacted analyzing agent remaining in the sample after reaction, the amount of dechlorination residual is continuously determined. The amount of dechlorination agent 16 added upstream to the process stream is continuously selectively varied using the determined amount of dechlorination residual present in the process sample.