Artisan’s Evaporation-Stripper column is the most cost-effective method of reducing volatiles in heat sensitive materials and viscous products to low ppm or ppb levels. The Evaporator/Stripper’s thin-film, disc-and-tube design offers unique advantages over conventional stripping technologies.
Principle of Operation
The feed into the Evaporator-Stripper enters from the top and cascades down over a series of (sometimes heated) tube and disk trays, where the volatile parts are stripped by the vapor introduced at the bottom of the column. The series of tube and disks provides a fresh liquid film at each stage. The extremely low pressure drop across the Evaporator-Stripper allows operation at a very high vacuum. Stripping is accomplished at the lowest practical temperature. For certain operations, Nitrogen is used as stripping medium instead of steam.
- Solvent removal from polymers, surfactants, industrial coatings, fats, waxes, vegetable oils.
- Dehydration of organic peroxides or other highly flammable organics.
- Purifying aromatics, tocopherols, alkyl phenols, esters, oleochemicals.
- Recycling solvents, alcohols, ketones.
- Deodorization of polymers, additives, agrichemicals, fish oils, vegetable oils.
Evaporator-Stripper – Advantages of Operation
High heat and mass transfer
Short Residence time
The short residence time in the Evaporator/Stripper minimizes fouling, degradation, and discoloration of heat-sensitive products.
High turn-down ratio
Low pressure drop
Low operating Temperatures
The Evaporator-Stripper can operate at very low pressure (< 5 mbar absolute), which allows for very low process temperatures.
The disc and tube design is self-draining and has no obstructions. The design can be adapted to handle very viscous applications (up to 8,000cP), foaming materials, and slurries containing solids. The design allows for an easy CIP or multi-product use.
Heated execution possible
The Evaporator-Stripper can be equipped with individually jacketed tubes, designed for steam or liquid heating. This execution permits simultaneous evaporation and stripping.
Evaporator-Stripper – Specific Examples
Safely and continuously dewatering of organic peroxides or other highly flammable or explosive organics.
Artisan’s patented falling-film disc-and-tube Evaporator/Strippers™ are utilized to dry organic peroxides used as curing agents in polyester and vinyl chloride polymerization. Low holdup volume and “no crevice” design make it the safest method for continuous drying of these highly flammable or explosive organics.
Drying methyl ketone peroxide from 5000 PPM to less than 200 PPM, by countercurrent stripping, using argon as the stripping medium.