METHOD FOR OBTAINING COKING ADDITIVE BY SLOW COKING OF OIL RESIDUES Russian patent published in 2012 - IPC C10B55/00 C10B57/04 

FIELD: oil and gas industry.

SUBSTANCE: initial raw material is heated in furnace 1 to temperature of 250-390°C and supplied to evaporator 2, where the recirculated substance, and namely heavy coker gas oil, is supplied as well. The secondary raw material is obtained as a result of mixing of initial raw material with the recirculated substance. Secondary raw material is heated in reaction furnace 4 up to temperature of 450-480°C. In rectifying column 3 the vapour-liquid products are fractionated into gas, petroleum, light and heavy gas oils and still residue. The latter is mixed with calcium and/or magnesium oxide in mixing tank 6 and supplied to coking chamber 5 simultaneously with the supply of heated secondary raw material. In coking chamber 5 there formed is coking additive and vapour-liquid coking products.

EFFECT: invention allows obtaining coking additive with low sulphur content and high volatile matter content.

3 cl, 1 dwg, 1 tbl, 6 ex