A purification method and integrated purification system for white oil decolorization and membrane separation oil mist removal

Abstract

The application discloses a purification method and an integrated purification system for decoloring white oil and removing oil mist by membrane separation. The method comprises the following steps: heating the recovered oil by using a pre-heater; mixing the white clay and the recovered oil by using a premixing kettle, and part of the premixed liquid is used as a reflux liquid; stirring and heating the premixed liquid by using a decoloring kettle to form a decoloring liquid and a decoloring tail gas; separating the decoloring liquid by using a filter cake layer filter to form white clay waste residue, white oil and filter cake tail gas; separating the filter cake tail gas and the decoloring tail gas by using a pre-separator to form white oil and separated gas; condensing the separated gas by using a condenser to form white oil and non-condensed gas; separating the non-condensed gas by using a membrane separation device to form white oil and discharged oil gas; filtering the white clay particles in the white oil by using a white oil filter to recover the white oil. The purification method and the integrated purification system can be used for decoloring treatment of the recovered oil obtained after dichloromethane rectification, and white oil components can be recovered from tail gas generated in the decoloring process, so that the white oil is obtained.

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