Chemical News

Sunday, July 20, 2008

New Generation Dry Cleaning

DryWash is an entirely new CO2-based system for dry cleaning of fabrics. Current dry-cleaning practice uses perchlorethylene as the cleaning solvent to loosen and remove dirt from the fibers of clothing material. However, the dry-cleaning industry must eliminate its use of perchlorethylene because both the atmospheric emissions and the chemical itself have significant environmental impacts.

Based on the desirable characteristics of CO2 – it is inert, stable, non-corrosive, and non-flammable – the DryWash system introduces a new generation of technology to the dry cleaning industry. DryWash uses liquid CO2-based fluid (not generic CO2) as the base solvent, but adds a new surfactant (dirt removing detergent additive), and then applies this new combination of cleaning liquids with a unique spraying device and agitation mechanism – all in a self-contained system.



The DryWash process soaks the clothes in a liquid CO2 filled tub at a pressure of 700 to 750 pounds per square inch and 54°F to 58°F. The load is agitated and at the end of the cycle, the dirt and oily residue drop out and CO2 pressure is lowered, allowing for the efficient recycling of CO2.

Global Technologies LLC began introducing the DryWash system in Europe in the fall of 1998 and started marketing in the United States in mid-1999. Commercial systems are now being sold by Alliance Laundry Systems LLC and SailStar USA.

Benefits
1. Reduces time cycle by 50%.
2. Lower operating cost.
3. Environmental benefit.

Energy Saving - 0.01 Trillion BTU/year
Carbon Reduction - 155000 Te/Year

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