Solvent cleaning process
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United States of America Patent
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Mar 3, 2009
Grant Date -
Jun 16, 2005
app pub date -
Dec 11, 2003
filing date -
Dec 11, 2003
priority date (Note) -
Expired
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Abstract
An improved solvent cleaning process of cleaning a non-aqueous solvent used in a dry cleaning process for fabrics including consecutive wash cycles for washing respective fabrics batches, including a basic solvent refining cycle and a first advanced solvent refining cycle, the basic solvent refining cycle including a step of separating solvent into a first solvent fraction and a second solvent fraction which is less clean than the first fraction, wherein the basic and first advanced solvent refining cycles are independently effected when solvent to be cleaned fulfils a respective predetermined condition.
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