| 摘要 |
A method of treating used cooking oil provides for exposing agitated oil for up to five minutes to a mixture of sodium silicate and silica xerogel in powder form, and filtering resulting oil powder mixture to remove the powder. The ratio of sodium silicate to silica xerogel is 30-70% to 70-30%, preferably 50-50%. The sodium silicate comprises 26-28% of Na2O, 53-55% of SiO2, and 15-20% of H2O, with bulk density of about 29-37 lbs/ft3, whereas the silica xerogel comprises: 96-99% of SiO2, and 1-4% of Na2SO4, with bulk density of about 24-27 lbs/ft3, the particle size being between 35 and 50 microns. Alternative embodiments provide the exposure of the oil first to one component of the mixture and then to another or the exposure to a single treating agent comprising 8-19% of Na2O, 66-83% of SiO2, 8-14% of H2O, and 0.1-2% of Na2SO4.
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