US 10,808,176 B2Granted

Method of delayed coking of petroleum residues

AssigneeWestport Trading Europe, Ltd.

InventorNikolay Yurchenko

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Abstract

The delayed coking method includes directing a heated secondary feedstock, which contains heated primary feedstock and recirculate, from a reaction furnace to a coking chamber. Vapor-liquid coking products formed in the coking chamber are then directed to a fractionation column, which fractionates hydrocarbon gas, gasoline, light and heavy gas oils, and bottom residues. Heavy gas oil from the fractionation column is directed to a thermal cracking furnace, the products of which are cooled by cooled light gas oil and directed to an evaporator for separation. In the evaporator, gases and light boiling products are removed by evaporation and returned to the fractionation column, and the remaining distillate cracking residue is separated and used as a component of the recirculate, along with bottom residues from the fractionation column. The resulting process produces high quality and high yield needle and anode cokes.

Claims15

Dependent claims

A method for delayed coking of petroleum residues, comprising:

(a) mixing a primary feedstock and a recirculate in a vessel to form a secondary feedstock;
(b) heating the secondary feedstock in a furnace;
(c) directing the heated secondary feedstock to a coking chamber to form coke and vapor-liquid coking products;
(d) fractionating the vapor-liquid coking products in a fractionation column to produce gas, gasoline, light and heavy gas oils, and bottom residue;
(e) cooling the fraction of light gas oil;
(f) thermally cracking the fraction of heavy gas oil to produce gas, gasoline, light gas oil, and distillate cracking residue;
(g) combining a portion of the cooled light gas oil of step (e) with the gas, gasoline, light gas oil, and distillate cracking residue of step (f);
(h) evaporating the combined gas, gasoline, and light gas oil from the distillate cracking residue;
and
(i) routing the separated distillate cracking residue directly to the vessel as a component of the recirculate;
wherein the vessel is upstream of the fractionation column.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/006,509Filed 12 Jun 2018
Published: US 2019/0375989 A112 Dec 2019
Granted: 20 Oct 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C10B 23/00
Destructive distillation of carbonaceous materials for production of gas, coke, tar, or
C10B 55/00
Coking mineral oils, bitumen, tar, and the like or mixtures thereof with
C10B 57/045
Using charges of special composition: containing mineral oils, bitumen, tar or the like or mixtures thereof
C10G 9/005
Thermal non-catalytic cracking, in the absence of hydrogen, of hydrocarbon oils: coking