SYNTHETIC FIBRES PRODUCTION - PTA
In a plant making Terephthalic Acid, (a constituent for the production of polyester fibres), there are silos or hoppers filled by mechanical or pneumatic conveying. Raw material feed hoppers in the preparation section empty into the mixing process, and finished product silos are discharged to bagging stations. The filling and emptying of these silos generates vent gas which has to be treated before going to atmosphere.
Such vent gas treatment involves the removal of large amounts of dusts and, due to the presence of acetic and benzolic acid, there is an odour problem also. With typically 10g / M3 of dust, a fabric filter may be installed as a primary stage. Alternatively, or in series, a wet cyclone or scrubber may be installed. It is not unusual for the effluent water to be fed to the mixer in the preparation section.
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