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BOKELA wins PTA order in China

BOKELA GmbH has signed a contract with one of the biggest Chinese producers of PTA (pure terephthalic acid) for supply of three BOKELA Hi-Bar Oyster Filters to their new pure terephthalic acid plant. The PTA plant with technology from a Chinese process licensor has a nameplate capacity of 600 kta.

After successful start-up and reliable operation of two Oyster filters in another Chinese PTA plant in 2009 a next PTA producer has now decided in favour of PTA single step filtration with our most modern rotary pressure filter technology: BOKELA Hi-Bar Filtration. The three Oyster Filters are destined for filtering, washing out of unwanted substances (especially p-toluic acid) and for high-grade dewatering of the product in one step.

One-step filtration of PTA with the BOKELA Oyster filters allows significant process simplification by replacement of several pressure decanters, re-slurry tank and subsequent atmospheric centrifuges or rotary vacuum filters. The Oyster Filters are characterised by simple plant layout and very low  space demand. BOKELA’s Hi-Bar Filtration avoid the unwanted crystallization/floc formation of dissolved components by keeping the temperature of the separated filtrate on a high level (p, T adjustment). The pressure filtration plant runs fully automated and can be operated via DCS without need for a field operator. The smooth and stable filtration is controlled by an intelligent logic which is able to self-adjust the filter to changing process demands.

For reliable discharge of the wet filter cake from 5.5 to 6 bar to atmospheric pressure BOKELA applies proven COPERION rotary valves with a very low gas leakage rate and a 100% discharge.

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