Abstract: A process for the hydroprocessing of heavy oils and/or oil residues, the process comprising the step of contacting the heavy oils and/or oil residues with a non-metallised carbonaceous additive in the presence of a hydrogen-containing gas at a temperature of from 250° C. to 600° C., wherein at least 80% of the cumulative pore volume of the non-metallised carbonaceous additive arises from pores having a pore size of at least 2 nm, wherein at least 50% of the cumulative pore volume of the non-metallised carbonaceous additive arises from pores having a pore size of at least 5 nm, and/or wherein at least 30% of the cumulative pore volume of the non-metallised carbonaceous additive arises from pores having a pore size of at least 10 nm.

Abstract: A process for slurry-phase hydrocracking of a heavy hydrocarbon feedstock in a reactor, such as an upflow bubble column reactor, includes separately introducing additive in two size ranges into the feedstock. A fine size particle additive is introduced upstream of a coarse size particle additive.

Abstract: A process for the hydroprocessing of heavy oils and/or oil residues, the process comprising the steps of contacting a non-metallised carbonaceous material with an acid to form a non-metallised carbonaceous additive; and contacting the heavy oils and/or oil residues with the non-metallised carbonaceous additive in the presence of a hydrogen-containing gas at a temperature of from 250° C. to 600° C.

Abstract: A process for the hydroprocessing of heavy oils and/or oil residues, the process comprising the steps of contacting a non-metallised carbonaceous material with an oxygen-containing gas at a temperature of at least 120° C. to form a non-metallised carbonaceous additive, and contacting the heavy oils and/or oil residues with the non-metallised carbonaceous additive in the presence of a hydrogen-containing gas at a temperature of from 250° C. to 600° C.

Abstract: A process for the hydrocracking of heavy oils and/or oil residues, the process comprising the step of contacting the heavy oils and/or oil residues with a non-metallised carbonaceous additive in the presence of a hydrogen-containing gas at a temperature of from 250° C. to 600° C. wherein the non-metallised carbonaceous additive has an average pore size of at least 2 nm.

Abstract: A process for slurry-phase hydrocracking of a heavy hydrocarbon feedstock in a reactor, such as an upflow bubble column reactor, includes separately introducing additive in two size ranges into the feedstock. A fine size particle additive is introduced upstream of a coarse size particle additive.