METHOD AND DEVICE FOR CLEANING MIXTURE CONTAINING OIL AND PARAFFIN Russian patent published in 2019 - IPC B01D9/02 C10G73/06 C10G73/36 C10G73/42 C07C7/14 C11B7/00 C11B3/00 

FIELD: technological processes.

SUBSTANCE: invention relates to fractionation of mineral or synthetic oil contaminated with paraffin. Method of fractionating a crude mixture containing at least one oil and at least one paraffin comprises step a) of preliminary fractionation by means of crystallization of layers of crude mixture containing at least one oil and at least one paraffin, or of crude mixture with solvent, obtained by adding before preliminary fractionation of solvent in amount of not more than 100% by weight relative to weight of crude mixture , to obtain a first fraction containing oil with low content of paraffin, and a second fraction containing paraffin with low oil content; first step b) of crystallization, including first sub-step b₁) crystallization of the suspension, in which the first fraction containing oil with low paraffin content is used to obtain a third fraction containing dewaxed oil and a fourth fraction; and second sub-step b₂) crystallization of suspension, on which mixture of fourth fraction obtained at stage b₁) of the method, and the second fraction containing paraffin with low oil content and obtained at stage (a) of preliminary fractionation, is used to produce the fifth fraction containing crude paraffin, and the sixth fraction. Invention covers installation 1 for method implementation containing raw mixture source; pre-fractionation stage 2 comprising at least one sub-stage of crystallization of layers 3 containing at least one crystallizer of layers; and a first crystallization stage 12 containing a first suspension sub-stage of suspension 14 located earlier in the process and containing at least one suspension crystallizer, and located downstream of the process, at least one second under-crystallization stage of suspension 14', containing at least one crystallizer of suspension, wherein the plant additionally comprises inlet line 4 for supplying the crude mixture to the inlet of the crystallization sub-stage of pre-fractionation stage 2 layers 3, the first connecting line 6 connecting the sub-stage crystallization outlet of pre-fractionation stage 2 layers 3 and the inlet of the first suspension crystallization sub-stage 14 of first crystallization stage 12 and second connecting line 7 connecting another outlet of crystallization sub-stage of layers 3 of pre-fractionation stage 2 and second input of sub-stage of suspension 14' crystallization of first crystallization stage 12.

EFFECT: invention enables to crystallize unrefined mixtures containing both heavy and light paraffins using a lower filtering surface with lower energy consumption per unit of the obtained product.

15 cl, 2 dwg