introducing a feedstock to crude distillation unit;

passing the bottoms of the crude distillation unit to vacuum distillation unit for further extraction of product fraction, wherein the bottoms of the vacuum distillation unit is routed for further extraction as feed at a flow rate and with a CCR content that exceed the design limits of the Coker unit;

contacting at least a portion of the feed with solvent in a de-asphalting unit to obtain a pitch stream containing asphaltenic fraction and predominantly a paraffinic stream containing a de-asphalted oil and the solvent;

passing the de-asphalted oil stream to a DAO stripper in SDA unit to obtain a DAO stream and the residual solvent;

mixing the DAO stream with a portion of the bottoms of the vacuum distillation unit to produce a mixed stream having a flow rate and a CCR content within the design limits of the Coker unit;

heating the mixed stream in a furnace to a coking temperature to obtain a hot stream;

transferring the hot stream to one of a plurality of coke drums where it undergoes thermal cracking reaction to obtain hydrocarbon vapors and coke; and

passing the hydrocarbon vapors produced from coking of de-asphalted oil to the fractionator column to obtain various product fraction.