Artisan Dualflo® Distillation Trays

Dualflo® distillation trays offer a simple solution to difficult distillation or stripping processes, especially in fouling service. They use the entire column cross-section as active mass transfer surface, enabling higher throughput and eliminating dead spots. Simplicity of design and ease of cleaning greatly reduce both installation and operating costs.

Dualflo® trays eliminate the need for overflow weirs and down-comers. With no down-comer, the liquid and vapor streams flow counter current to each other through the same small sieves in the tray. Perforationssize can be as small as 1/8 inch diameter for relatively clean service and small solid particles, or as large as ½ inch for severe fouling service containing large solid particles.

The turbulent vapor/liquid traffic in the column reduces accumulation of solids in the trays. By design, this reduces fouling and eliminates the potential accumulation of solids in the tray openings.
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How Dualflo® Trays Work

Artisan Dualflo® trays typically range in size from 3 to 84 inches in diameter. The pressure drop across a Dualflo® tray is measured in inches of water and it depends on the height of the liquid on the tray. The height is typically 3 to 6 inches of fluid, also known as the “froth”.

Column F-factors range from 1 to 3 depending on the physical properties of the liquid. Overall tray efficiencies range from 20 to 80% depending on the application and turndown.

Materials of construction include stainless steel (300 series and Duplex), carbon steel, nickel, Inconel®, Monel®, Hastelloy®, and titanium.
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Application-Specific Tray Design Ensures High Performance
Because each application is unique, we combine our extensive experience with pilot data from our pilot plant to determine optimal tray design. Artisan has designed Dualflo® trays for handling thousands of gallons per hour of throughput. They have been used for over 30 years in more than 70 installations worldwide.

Distillation of Solids-Containing and Fouling Materials

Problem
Distilling solids containing, foaming, and fouling aqueous and organic materials can be difficult and expensive.

Solution
Artisan’s proprietary Dualflo® distillation column and trays demonstrate superior performance in severe applications where structured packing or other tray designs are poor choices. Compared to conventional trays, Dualflo® trays eliminate the need for overflow weirs and down-comers. They use the entire column cross-section as an active mass transfer surface, enabling higher throughput and eliminating dead spots. Simplicity of design and ease of cleaning greatly reduce both installation and operating costs.

Other Dualflo® Applications:

  • Removing contaminants down to low ppm levels
  • Processing feeds containing dissolved and suspended solids with no pre-treatment in most cases
  • Stripping off aromatic hydrocarbons, all common chlorinated solvents, alcohols, ketones, and other
  • Miscellaneous solvents/hydrocarbons
  • Fractionation, stripping, deodorizing or any other operation requiring gas-liquid contact
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Multi-Stage Stripping


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Strip Volatiles From Low Viscosity Liquids That Foul Or Contain Solids
For these applications, Artisan recommends our Dualflo® distillation trays to strip volatiles from the product. 

 
Dualflo Trays Offer the Following Advantages Over More Complicated Tray Designs:
  • Lower capital cost
  • Easier to install, remove and clean
  • Efficiency equivalent to bubble cap, valve or conventional sieve trays
  • Stays clean longer when processing fouling or solids-containing liquids
  • Less downtime for maintenance
  • Turn down as high as 4:1