General applications of Perchlorethylene

Perchlorethylene has no flash point and no fire point, which gives it an important advantage over petroleum distillates such as Stoddard solvent for dry cleaning operations. As a result, along with its desirable physical properties, Perchlorethylene has become the largest-volume dry cleaning solvent.

Perchlorethylene is relatively inert, and is inherently more stable than other chlorinated solvents. PPG’s perchlorethylene is further stabilized to prevent solvent degradation or decomposition, and corrosion of metal parts and equipment in vapor degreasing. PPG stabilizers are designed to be recoverable along with the perchlorethylene after repeated cleaning cycles, including recovery from carbon adsorbers.

In addition to its wide use as a drycleaning solvent, PPG’s perchlorethylene is used extensively forvapor degreasing because of its high solvency, non-flammability and high vapor density.

1. Drycleaning solvent

Perchlorethylene is the preferred solvent because, in addition to its non-flammability, it provides a fast, powerful yet gentle cleaning action with a minimum of mechanical agitation. The result is less fabric wear. PPG’s perchlorethylene cleans all natural and synthetic fibers.

Cleaning cycle and drying times are fast with perchlorethylene, and because of its high solvency fewer stains are left forthe spotter. Because the solvent is recoverable, it has a long service life.

PPG’s perchlorethylene works with any drycleaning detergent, so that the dry cleaner can add detergent or soap and make his own charged system as needed.

2．Vapor Degreasing

Many industries, including aerospace, appliance and automotive, use perchlorethylene for vapor degreasing of metal parts. Although trichlor has a more general usage for vapor degreasing, perchlorethylene is preferred in some situations because of its higher boiling point (above that of water). Many soils such as waxes and resins must be melted in orderforthem to be solubilized.

The high boiling point(250°F/121°C) of perchlorethylene enables it to condense more vapor on the metal to be cleaned than other chlorinated solvents, thus washing the parts with a greater volume of solvent. Perchlorethylene cleans longer and removes higher-melting-point pitches and waxes more easily. It is effective with lightweight and light-gage parts that warm up to the temperature of a lower boiling-point solvent and therefore stop condensing liquid on the parts before cleaning is complete.

Perchlorethylene is particularly effective in fine orifices and spot-welded seams. Perchlorethylene forms an azeotrope with waterthat has a boiling point below that of water, while perchlorethylene itself has a higher boiling point than water. As a result, perchlorethylene allows a vapor degreaserto function as a drying device for metal parts and to remove waterfilms from metals without degradation of the solvent.

3. Chemical Processing

Perchlorethylene serves as a carrier solvent forfabric finishes, rubber and silicones; and as an extractive solvent. It is used in paintrem over formulations and in printing inks. It serves as a chemical intermediate. Perchlorethylene also is often used as a component of “safety” solvent blends. When used forth is purpose it is important to determine the flash point of the mixture as it is to be used before using or selling, since an insufficient quantity of perchlorethylene wills notraise the flash point of the mixture.

4. Catalyst Regeneration

Perchlorethylene is used in the petroleum refinery industry as a source of HCl, a promoter, which helps in the regeneration of catalyst in both catalytic reformer and isomerization operations. Product sold into this operation is a purer, less stabilized grade than most grades as the product has to meet UOP specifications to preclude the poisoning of the valuable platinum catalyst.

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