Nanometer compound solid acid catalyst for preparing biodiesel
A solid acid catalyst and nano-composite technology, which is applied in the direction of physical/chemical process catalysts, biofuels, fatty acid esterification, etc., can solve the problems of high cost, increased catalyst cost, and impact on catalytic effect, and achieves less addition and selectivity Strong performance and long catalyst life
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manufacture example 1-4
[0031] Production Example 1-4, Preparation of Composite Alumina Carrier
[0032] 1), 1000g of raw kaolin is washed with 1000ml of dilute sodium hydroxide with a concentration of 0.5mol / L, filtered, then washed with 1000ml of dilute sulfuric acid solution with a concentration of 1mol / L, filtered and dried, and the filter cake is placed in a muffle In the furnace, bake at 650-850°C for 5-10 hours.
[0033] 2) Add 1800-3000ml of dilute sulfuric acid with a concentration of 1mol / L into a three-necked flask with a stirring device, heat to 60-100°C, weigh 100g of kaolin treated in step 1) and place it in a three-necked flask, keep stirring React under the condition for 5-9 hours, then filter and dry to obtain acid-modified kaolin. After testing, the specific surface area of acid-modified kaolin is 250-320m 2 / g.
[0034] 3), the acid-modified kaolin prepared in step 2) and alumina (specific surface area 270-310m 2 / g) mixed according to the mass ratio of 1:3-99, adding an appr...
Embodiment 1-4
[0038] Embodiment 1-4, preparation nanocomposite solid acid catalyst
[0039] The preparation technology of nanocomposite solid acid catalyst of the present invention, comprises the steps:
[0040] 1), with 200ml concentration of 2.0mol / L dilute H 2 SO 4 The solution dissolves 0.1mol Dy 2 o 3 , so that it is just completely dissolved to obtain A solution, take 4-15mol of ZrOC1 2 ·8H 2 O, and add an appropriate amount of deionized water to make it dissolve completely to obtain the B solution;
[0041] 2), add 800-2500ml concentration to the B solution obtained in step 1) and be 2.0mol / L dilute H 2 SO 4 , and then slowly add ammonia water to adjust the pH value of the system to 2-6 to obtain nano-hydrated zirconia colloids, age for 8-16h, adjust the pH value to 8-10 with ammonia water, filter with suction, and wash until there is no C1 - , to obtain a filter cake, add 1500-5000ml deionized water to the above filter cake to prepare a nano-hydration zirconia colloidal susp...
Embodiment 5-12
[0055] Embodiment 5-12, the preparation of biodiesel
[0056] Examples 5-12: The 1#, 2#, 3# and 4# nanocomposite solid acid catalysts prepared in Examples 1-4 were used to prepare biodiesel.
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