Waste lubricating oil pretreatment method
A technology for waste lubricating oil and pretreatment, applied in the direction of lubricating composition, etc., can solve problems such as ineffectiveness, and achieve the effects of simple operation, simple pretreatment process and low operating cost.
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[0011] Example 1: Pretreat waste lubricating oil according to the following steps
[0012] (1) Oxidative decolorization: Put the waste lubricating oil into the reactor, add sodium hydroxide solution, the dosage of sodium hydroxide is 1% of the waste lubricating oil; at 60℃, it is oxidized with the oxidant sodium hypochlorite, The reaction time is 1.0h, and the dosage of oxidant is 5% of the waste lubricating oil;
[0013] (2) Flocculation: Add the flocculant polysilicate ferric sulfate to the oxidation reaction mixture, and stir for 5.0 hours at 60°C; the amount of the flocculant is 1.0% of the waste lubricating oil;
[0014] (3) Demulsification: Add SP type demulsifier to the flocculation reaction mixture and stir for 1.0 h at 60°C; the amount of the demulsifier is 1.0% of the waste lubricating oil;
[0015] (4) Settling: Put the demulsified mixture into a settling tank for settling, the settling time is 12h, and the settling temperature is 40℃;
[0016] (5) Separation: directly take ...
Example Embodiment
[0017] Example 2: Pretreat waste lubricating oil according to the following steps
[0018] (1) Oxidation decolorization: Put the waste lubricating oil into the reactor, add sodium hydroxide solution, the dosage of sodium hydroxide is 3% of the waste lubricating oil amount; oxidize it with oxidant hydrogen peroxide at 60℃, The reaction time is 2.0h, and the dosage of oxidant is 10% of the waste lubricating oil;
[0019] (2) Flocculation: Add the flocculant polysilicate ferric sulfate to the oxidation reaction mixture and stir for 4.0h at 60°C; the amount of the flocculant is 3.0% of the waste lubricating oil;
[0020] (3) Demulsification: Add SP type demulsifier to the flocculation reaction mixture and stir for 2.0h at 60°C; the amount of the demulsifier is 3.0% of the waste lubricating oil;
[0021] (4) Settling: Put the demulsified mixture into a settling tank for settling, the settling time is 10h, and the settling temperature is 60℃;
[0022] (5) Separation: directly take the sedime...
Example Embodiment
[0023] Example 3: Pretreat waste lubricating oil according to the following steps
[0024] (1) Oxidation decolorization: Put the waste lubricating oil into the reactor, add the soda ash solution, the dosage of soda ash is 9% of the waste lubricating oil; it is oxidized with oxidant hydrogen peroxide at 80℃, the reaction time is 2.0 h, the dosage of oxidant is 15% of the waste lubricating oil;
[0025] (2) Flocculation: Add the flocculant amphoteric polyacrylamide polymer to the oxidation reaction mixture and stir at 80°C for 3.0h; the amount of the flocculant is 5.0% of the waste lubricating oil;
[0026] (3) Demulsification: Add AP type demulsifier to the flocculation reaction mixture and stir at 80°C for 3.0 hours; the amount of the demulsifier is 1.0% of the waste lubricating oil;
[0027] (4) Settling: Put the demulsified mixture into a settling tank for settling, the settling time is 8h, and the settling temperature is 60℃;
[0028] (5) Separation: directly take the sedimented upp...
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