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Ametek Cooler/Absorber Boosts Efficiency, Resists Corrosives

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Application Description

Ametek has developed a patented cooler/absorber for stripping aggressive gases (HCI, SO2, etc.) from chemical or refinery process streams. The versatile design functions like a column with the tubing acting as temperature-controlled packing that can add as well as remove heat. The new design uses clusters of small-diameter tubing made from Ametek's "Q" resin, a patented thermally conductive compound based on Teflon® PFA fluoroplastic resin and graphite.

In a typical installation, 1860 tubes measuring 0.125 in. (3.2 mm) in diameter by up to 25 ft. (7.3 m) long are vertically disposed in a steel column lined with Teflon® PTFE fluoroplastic resin. Cooling water flows upward through the heat-conductive tubing. Gas and droplets of water or another absorbing medium flow downward through the column, outside the tubing. The gas dissolves in the absorbing medium, which collects on the outer tubing wall.

The heat of solution is absorbed through the wall by the cooling water.

Benefits Gained

  • Corrosion and Heat Resistance
    Thanks to the chemical and heat resistance of Teflon®, the cooler/absorber can be used with a wide range of aggressive chemicals at temperatures up to 400°F (204°C)

  • Smaller, Less Expensive
    Ametek says that its units take less space and cost less than conventional designs because "Q" resin has double the thermal conductivity of unfilled fluoropolymers.

  • More Durability
    Ametek reports that its cooler/absorber provides more resistance to thermal and mechanical shock and fouling, and requires less maintenance than traditional graphite units.

Materials Selected and Why

Teflon® PTFE and Teflon® PFA meet needs for broad chemical resistance. Teflon® PFA allows compounding for conductivity and extrusion as small diameter tubing.

Manufacturer

Ametek, Inc., Haveg Division
Wilmington, DE