Henan Beigong used motor oil refining equipment, refining diesel fuel steps:
(1) Settling will be used oil static, so that the impurities fall and separate. Settling time is determined by the oil quality and oil temperature. The higher the oil temperature, the lower the viscosity, the easier the impurities fall, the shorter the settlement time. Generally the settling time of impurities in the oil has the following relationship with the temperature.
(2) distillation of used motor oil after sedimentation treatment to remove the sediment into a distillation flask. Installed distillation device, heating for atmospheric distillation. Distilled at 180 ° C is gasoline, 180 ~ 360 ° C fraction is diesel fuel, leaving the oil. If the used motor oil is known to be free of impurities such as gasoline and diesel fuel, this step of the operation can be omitted.
(3) pickling the settlement, distillation of motor oil into a large beaker, heated to 35 ℃, under stirring, slowly add the volume of motor oil accounted for about 6 to 8% of the concentrated sulfuric acid (in 30 minutes to add the end). At this time, the concentrated sulfuric acid reacts with the gums and asphalt-like impurities in the used motor oil by sulfonation. In order to remove these sulfonated impurities, add 10% caustic soda solution, which accounts for 1% of the oil volume, to act as a coagulant and accelerate the layering of impurities. After adding alkali stirring for 5 minutes, leave it for a period of time, there is a clear stratification, the upper layer of oil is yellowish green, no black particles and other impurities.
(4) alkali washing this step is to remove organic acids in the used oil and neutralize the sulfuric acid left behind when pickling. Acid washed oil into another beaker, heated to 90 ° C, slowly add 5% of the mass of the oil under stirring sodium carbonate powder, 20 minutes to test the acidity of the oil. Take two test tubes and add 1mL of distilled water to each, add 2 drops of phenolphthalein reagent to one of them and 2 drops of methyl orange reagent to the other. Then add 1mL of oil sample in two test tubes and oscillate for 3 minutes, if the color of the aqueous layer in the two test tubes remains unchanged, it means that the oil is neutral, at which point the oil should become clear.
(5) filtration of industrial oil filter. Domestic oil can be used 4 to 6 layers of silk cloth repeatedly filtered 2 to 4 times, that is, qualified diesel fuel.