Cleaning method for membranes
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United States of America Patent
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-
Mar 12, 2002
Grant Date -
N/A
app pub date -
Apr 28, 2000
filing date -
Aug 12, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Oils, extracted from vegetables and animal tissues contain impurities such as waxes that can be removed in a refining process, including dewaxing of the oils that include removal of oils by filtration through membranes. During filtration, the impurities stick to the membranes, which causes a reduction in flux through the membranes. The initial top flux can be approached again by regularly cleaning the membranes including steps of: backblowing with gas, backflushing with edible oil, and treating the membranes with alkaline material. The cleaning method is particularly suitable for cleaning membranes in the form of microfilters having an average pore diameter of 0.5-5 .mu.m, which are used in the refining process.
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