In the decolorization and deodorization method of washing oil, hydrofining has good decolorization effect and less harm to the environment, but it has high cost, low washing oil utilization rate and low economic benefit; ion exchange resin refining has resin performance The requirements are high, the labor intensity is too large, the adsorbent cannot be recycled, the cost is high, and the profit is low; the use of concentrated sulfuric acid is difficult to transport, the yield after decolorization is low, and the acid residue produced pollutes the environment and needs further treatment. Using acid-base refining method, the sludge after washing oil decolorization must be treated, otherwise it will cause certain pollution to the environment.
