METHOD OF ORGANOCHLORINE COMPOUNDS REMOVAL FROM OIL Russian patent published in 2020 - IPC B01D53/74 C01B7/01 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil purification from undesirable components, namely removal of organochlorine compounds (OCC) residues. Process consists in desorption of OCC from oil with inert gas, where nitrogen is used as gas. Steam-gas mixture formed during desorption consists of inert gas and hydrocarbon vapours and is fed into an absorber where the OCC is removed from the vapour-gas mixture by a selective absorber. Steam-gas mixture thus depleted in the OCC is directed back into the desorber for repeated OCC desorption from oil. Peculiar feature of the process is maintaining constant values of hydrocarbon vapours circulating in gaseous phase at outlet of desorber and outlet from absorber. Selective absorber is presented by using an absorbent which is not miscible with light hydrocarbons and is selected from methylpyrrolidone, glycols and water-glycol absorbents containing an alkaline reagent.

EFFECT: invention enables to reduce heat costs for evaporation and condensation of light oil components.

3 cl, 1 dwg