| 摘要 |
Oils, extracted from vegetables and animal tissue contain impurities such as waxes, that can be removed by filtration. During filtration the impurities stick to the membranes, which causes a reduction in flux. The initial flux can be reached again by regularly cleaning the membranes by applying the steps of: (a) backblowing with gas, (b) backflushing with edible oil, (c) treating the membranes with alkaline material. The cleaning method is in particular suitable for cleaning microfilters having an average pore diameter of 0.5-5 .mu.m, that are used in an oil refining process.
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