METHOD OF ISOLATING OIL IN SOIL BY CHEMICAL ENCAPSULATION Russian patent published in 2020 - IPC B09C1/08 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to the field of environmental protection, in particular to processes of recycling oily wastes (sludges), and can be used in oil, petrochemical and other industries related to storage, transportation and processing of oil and oil products. Method of isolating oil in soil by chemical treatment involves introduction of acidic and alkaline agents which form compounds which are insoluble in water in a wet matrix. Process is carried out by adding to soil contaminated with soil an emulsifier - calcium stearate (StCa), calcium carbonate (CaCO₃) as an alkaline agent and iron (II) sulphate - FeSO₄ * 7H₂O - as acidic agent in weight ratio of 1.0:0.5:0.3:0.85 > Oil : StCa : CaCO₃ : FeSO₄ * 7H₂O ≥ 1.0:0.3:0.2:0.55.

EFFECT: technical result consists in creation of efficient, easy-to-process method of oil-containing soil recovery to produce environmentally safe product.

1 cl