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Copyright © Tarek Kakhia. All rights reserved. http://tarek.kakhia.org Cooling and drying : Chlorine gas exiting the cell line must be cooled and dried since the exit gas can be over 80° C and contains moisture that allows chlorine gas to be corrosive to iron piping. Cooling the gas allows for a large amount of moisture from the brine to condense out of the gas stream. This reduces both the cooling requirements and feed flow of sulfuric acid required in the drying towers. Cooling also improves the efficiency of both the compression and the liquefaction stage that follows. Chlorine exiting is ideally between 18° C and 25° C. After cooling the gas stream passes through a series of towers with counter flowing sulfuric acid. The sulfuric acid is fed into the final tower at 98% and the first tower typically has a strength between 66 % and 76 % depending on materials of construction. These towers progressively remove any remaining moisture from the chlorine gas. After exiting the drying towers the chlorine is filtered to remove any remaining sulfuric acid. Compression and liquefaction : Several methods of compression may be used: liquid ring, reciprocating, or centrifugal. The chlorine gas is compressed at this stage and may be further cooled by inter - and after- coolers. After compression it flows to the liquefiers, where it is cooled enough to liquefy. Non condensable gases and remaining chlorine gas are vented off as part of the pressure control of the liquefaction systems. These gases are routed to a gas scrubber, producing sodium hypochlorite, or used in the production of hydrochloric acid ( by combustion with hydrogen ) or ethylene dichloride ( by reaction with ethylene ) . Storage and loading : Liquid chlorine is typically gravity - fed to storage tanks. It can be loaded into rail or road tankers via pumps or padded with compressed dry gas . 12PDF Image | Chlorine Characteristics
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