Decoloration method in process for preparing biodiesel from waste cooking oil
A technology of catering waste oil and biodiesel, which is applied in the field of decolorization, can solve the problem of high temperature required, and achieve the effects of improved color, low decolorization temperature and short decolorization time
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[0027] Example 1
[0028] Add 40g of filtered catering waste oil in a 100mL conical flask (absorbance A 0 1.257), heated to 70 ℃, first add 1.2g of hydrogen peroxide, stir at 20rpm for 10min, then use a separatory funnel to stand still to separate the liquid, take the upper liquid, and then add 4g of kaolin with a pore diameter of 2-50nm and 2g of kaolin 0.5-40nm activated carbon, stir at 80℃, 20rpm for 30min, take out the decolorized catering waste oil, immediately filter with low-speed filter paper, and test the filtrate with a 722E visible spectrophotometer to measure the absorbance A of the decolorized catering waste oil 1 It was 0.136, and the decolorization rate reached 89.2%.
[0029] Table 1 shows the comparison of various performance indexes of catering waste oil before and after decolorization.
[0030] Table 1 Comparison of properties of catering waste oil before and after decolorization
[0031] Performance
[0032] It can be seen that by decolorizing the catering wast...
Example Embodiment
[0039] Example 2
[0040] In this example, the same filtered catering waste oil was decolorized in the same manner as in Example 1, except that the decolorization temperature of hydrogen peroxide was changed to 65°C.
[0041] After testing, the absorbance of waste oil from catering after decolorization is A 1 It was 0.155, and the decolorization rate was 87.7%.
Example Embodiment
[0042] Example 3
[0043] In this example, the same filtered catering waste oil was decolorized in the same manner as in Example 1, except that the hydrogen peroxide decolorization time was changed to 8 min.
[0044] After testing, the absorbance of waste oil from catering after decolorization is A 1 The order is 0.150, and the decolorization rate is 88.1%.
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