| 摘要 |
<p>Disclosed is a method of manufacturing diesel fuel by using waste edible oil, wherein the method comprises the steps of: a) removing impurities in the waste edible oil, which is vegetable oil containing fatty acid of 0.01% or less, at 8O0C; b) carrying out a methyl esterification reaction by adding a sodium hydroxide-methanol solution to the waste edible oil of step a); c) neutralizing a reaction solution from step b) by adding a phosphoric acid (H3 PO4 ) solution; d) adding sodium hydroxide to the solution, followed by precipitation, and separating the solution into a first layer (organic layer), a second layer (glycerin-methanol layer), and a third layer (sodium hydroxide- phosphoric acid layer); e) removing the second layer (glycerin-methanol layer) and the third layer (sodium hydroxide-phosphoric acid layer), and recovering the first layer (organic layer); and f) carrying out a water- washing and drying process for the recovered first layer (organic layer). In the method, an expensive device is not required, thereby reducing the manufacture cost. Also, glycerin and waste catalyst can be recycled, thereby preventing the generation of waste water. Also, a separated and recovered by-product (glycerin) can be recycled, and methanol can be reused by recovery, thereby increasing economical efficiency, and reducing en¬ vironmental pollution.</p> |
