Arvand Petrochemical dry chlorine gas filter clogging problems Varyh solutions to improve performance

Arvand petrochemical company as the greatest producer of PVC complex is designed to produce 585000 T/Y chlorine in CA plant. The chlorine is fed to EDC/VCM plant of Arvand and to another petrochemical companies.in order to use the chlorine in the plants it should be dried by H2SO4 98%.The process includes exchangers to cool down the chlorine gas to remove some moisture content , a wet candle filter to remove NaCl from the flow , an absorption column with 2 parts(a packed part in lower section and a 5 tunnel trays section above)in the column drying of chlorine gas executed by H2So4 98% and finally the dried chlorine gas is fed to a dry candle filter .The main problem of the unit occurred in this filter by increasing of differential pressure by increasing of chlorine gas flow rate.In this paper we are looking for the reason of the problem and to find out some suggestions to solve it.