Many chemical processes involve chemical separations through different types of columns, distillation, scrubbing, stripping and liquid-liquid extraction. The efficiency of this equipment is governed by the quality of the phase contactors. Over the years, the physical size and energy consumption of these systems has been reduced through the use of more sophisticated types of contactors with random or structured packings.
But these improvements make this technology more sensitive to fouling. A small amount of contaminant can render a large column inoperable. Clean up may be hazardous and require several days to complete. Pall has developed and commercialized filtration and separation technology to protect these state-of-the-art systems.
Proper protection can maximize efficiency and extend run times. And proper treatment no longer require cooling of the column feed or reflux as Pall has filtration products capable of operating at temperatures greater than 400°F (204°C)
Column processes benefiting from the use of Pall filtration products include resins, phenol, nitrocumene and other aromatic products.
Continuous operation of the reboiler is necessary to maximize performance of the entire system. Free water, evaporated with the organic process stream, often contains dissolved salts that collect within the re-boiler. These salts foul and corrode the re-boiler reducing its efficiency as a heat exchanger.
In addition, water may be added upstream as a washing step to capture these salts. This may further concentrate the salts in the re-boiler.
Pall Phasesep® liquid/liquid coalescing technology removes virtually all free water from the organic phase. Installation of this product downstream or in lieu of the water settler has extended re-boiler life between cleanings by 10X.
Pall products are in service protecting re-boilers used in the production of phenol, ether resins, monomers and other chemicals.
Liquid/Liquid Extraction Columns
When conditions prevent use of a distillation column, liquid/liquid extraction is often the separation technology of choice. Through contact between the dispersed and continuous liquid phases is essential to achieving maximum separation. Unfortunately, the interface between the dispersed and continuous phases traps particulate inhibiting efficient material transfer. Fine filtration (10 microns absolute or better) of both process and solvent feeds will maximize column capacity.