Method of preparing biological diesel oil from high acid value grease by solid acid pretreatment
A high acid value oil and biodiesel technology, applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of high corrosion, equipment investment, increased production energy consumption, complex composition of acid active compositions, etc. , to reduce energy consumption and alkali consumption, expand the range of raw material selection, and achieve good reusability.
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[0020] Example 1:
[0021] Add 50ml soybean oil (density 0.92g / cm 3 ), 4g oleic acid, 20ml methanol (density 0.79g / cm 3 ), 1.0 g SO 4 2- / Al 2 O 3 / ZrO 2 Solid acid catalyst (in which Al 2 O 3 The content is ZrO 2 4% of the molar amount), under normal pressure and 55° C., the esterification reaction was carried out for 3 hours, and the acid value of the reaction solution was 1.7. After the reaction, the reaction solution was filtered to filter out the solid acid catalyst and collected for regeneration and reuse. The filtrate and 0.7 g of NaOH were added to the reactor, heated to 65° C., and transesterified under normal pressure for 1 hour. After the reaction is completed, the layers are allowed to stand for separation, the upper layer is fatty acid methyl ester and a small amount of methanol, and the lower layer is glycerin, methanol and alkali. After the upper layer was distilled to remove methanol, 46.2 g of biodiesel was obtained. The total yield of the reaction was 92.4%. The...
Example Embodiment
[0024] Example 2:
[0025] After the waste oil collected from the restaurant is dehydrated by removing impurities, take 40 grams (acid value 20.1) and 20ml methanol, 1.2g SO 4 2- / Al 2 O 3 / ZrO 2 Solid acid catalyst (Al 2 O 3 The content is ZrO 2 5% of the molar amount) was mixed and added to the reactor, and the acid value of the reaction liquid was reduced to 2.4 under the conditions of normal pressure and 65° C. for 3.5 hours of esterification reaction. After the reaction, the reaction liquid was filtered to filter out the solid acid catalyst, the filtrate and 0.8 g of NaOH were added to the reactor, heated to 60° C., and transesterified under normal pressure for 2 hours. After the reaction is completed, the layers are allowed to stand for separation, the upper layer is fatty acid methyl ester and a small amount of methanol, and the lower layer is glycerin, methanol and alkali. After the upper layer was distilled to remove methanol, 33.6 g of biodiesel was obtained. The total ...
Example Embodiment
[0026] Example 3:
[0027] Add 100ml soybean oil, 5g oleic acid, 25ml methanol, 1.5g Al to the reactor 2 O 3 / WO 3 / ZrO 2 Solid acid catalyst (in which Al 2 O 3 The content is ZrO 2 2% of the molar amount), under normal pressure and 60°C, the esterification reaction is carried out for 2 hours, and the acid value of the reaction solution is 1.5. After the reaction, the reaction solution was filtered to filter out the solid acid catalyst and collected for reuse in the province. The filtrate and 1.8 g of NaOH were added to the reactor, heated to 68°C, and transesterified under normal pressure for 1.5 hours. After the reaction is completed, the layers are allowed to stand for separation, the upper layer is fatty acid methyl ester and a small amount of methanol, and the lower layer is glycerin, methanol and alkali. After the upper layer was distilled to remove methanol, 91.2 g of biodiesel was obtained. The total yield of the reaction was 94.0%.
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