Systems Work Together for HCI Removal and Recovery - Case Study

A specialty chemical manufacturer was looking for a way to remove HCI from its off-gas before it was discharged to the atmosphere. CR Clean Air designed and manufactured a system which uses two Jet Venturi Fume Scrubbers in series, followed by two Packed Towers in series. Intimate mixing of the gas stream and scrubbing liquid allows the Jet Venturi Scrubbers to remove 98% of the HCI and the Packed Towers to remove the remainder. The Jet Venturi Scrubbers collect 98% of the HCI while creating a marketable aqueous HCI solution. The Packed Towers recirculate the diluted NaOH solution, and "polish" the gas stream to meet low HCI discharge limits. The units have proved to be virtually maintenance free, with final emissions concentrations of approximately 2 PPM. Liquid waste production is minimal and the recovery of marketable HCI has offset the cost of the system.