Advanced Solutions for Difficult Liquids

Two-in-one specialty filter bags absorb both dirt and oil. Photo courtesy of Eaton
Two-in-one specialty filter bags absorb both dirt and oil. Photo courtesy of Eaton

A t the recent Achema trade show for the processing industries held in Frankfurt, Germany (June 10-14), the Filtration Division of energy management company Eaton, headquartered in Nettersheim, Germany, introduced a number of new filtration solutions.


To boost process efficiency in the filtration of oil-containing liquids such as chemicals, paints and varnishes, Eaton’s filter bag program now includes the Sentinel Maxpo and Duragaf Maxpoxl two-in-one specialty filter bag ranges. These fully-welded systems comprise durable needlepunched nonwoven polypropylene outer layers and meltblown polypropylene inner cores to significantly increase their dirt-holding capacity and oil absorption ability.

The integrated inner core ensures oil absorption for which an additional filtration step would otherwise be necessary and its porous fiber matrix also provides a high dirt-holding capacity with a low differential pressure.

Installed in chemical, petrochemical and water pipes, the media effectively protect industrial systems from unwanted particles and their improved sealing and surface finish properties comply with the Pressure Equipment Directive (PED), EN13445 and AD 2000 pressure vessel codes.

Polyester Performance

Eaton has also recently expanded its Loftop and Loftrex M depth filter cartridges to include meltblown polyester media specifically for high chemical resistance, in addition to existing polypropylene and polyamide 6.6-based versions.

When choosing a suitable filtration system, the chemical resistance of filter materials is one of the most important factors for users in many industries, particularly the chemical production industry. In this industry, many processes involve filtering demanding or aggressive solutions that would damage unsuitable filter materials.

“In the chemical industry, everything interacts with everything else,” said Alexander Bachmann, senior application engineer for Eaton’s Filtration Division. “For media such as paints and solvents, it is necessary to ensure both chemical and thermal resistance and for various processes, these requirements can be fulfilled by filter cartridges that use polyester as the filter media.”

Environmental Requirements

Meltblown polyester media have higher chemical resistance. Photo courtesy of Eaton
Meltblown polyester media have higher chemical resistance. Photo courtesy of Eaton

Manufacturers and producers of paint resins have also relied on filter cartridges bonded with phenolic resin to date, but although these offer the necessary chemical resistance, their manufacturing process and disposal means that they are becoming increasingly incompatible with stricter environmental requirements.

“Meltblown polyester filter cartridges provide users with an alternative to filter cartridges that are bonded with phenolic resin,” said Bachmann.

Loftop and Loftrex M filter cartridges are available in different lengths and with all common adapter configurations and sealing materials for safe use in a wide range of applications and filter housings. Loftop depth filter cartridges offer absolute retention rates from 0.50 to 120μm, with a retention efficiency of 99.98% and Loftrex M depth filter cartridges offer nominal retention rates from 1 to 150μm with a retention efficiency of 95%.

They are made from high-purity microfibers which are meltblown onto an inner core in a controlled manner and thermally bonded in a single process step without the use of additives. The filter cartridges do not contain any adhesives or binders and are individually sealed in foil to reliably prevent cross-contamination prior to installation, providing a high dirt-holding capacity in a wide range of applications.

Activated Carbon

With the new Beco Carbon ACF 03 grade media which is available in flat sheet, stacked disc cartridge and disposable capsule designs, Eaton is also responding to the growing demand for user-friendly activated carbon sheets tested for endotoxins for pharmaceutical, biopharmaceutical and fine chemical applications. Active pharmaceutical ingredient (API) and active cosmetic ingredient (ACI) manufacturing processes in particular demand the strong capabilities of activated carbon depth filter sheets for decolorization and adsorptive separation of undesired byproducts.

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