Patent GB-1454136-A (GB)
Title: Process of preparing desulphurized light oil and fuel gas from heavy oil
IPC: C10G11/00
Filed: 1974-02-12
Abstract: 1454136 Desulphurized light oil and fuel gas MITSUI SHIPBUILDING & ENG CO Ltd 12 Feb 1974 [15 Feb 1973] 6281/74 Heading C5E Desulphurized light oil and fuel gas are produced by converting heavy oil into a desulphurized gas, a desulphurized light oil and a carbonaceous residue with appreciable quantity of volatile component, in a first coking reactor 6 operating at 470 to 550 C. and provided with fluidized bed 5 consisting of particles of alkali metal carbonate-containing solids, the carbonaceous residue being deposited on the particles constituting the fluidized bed; simultaneously converting a position of the sulphur in the heavy oil into alkali metal sulphide; recovering desulphurized gas and desulphurized light oil from the first reactor; transferring the carbonaceous residue deposited on the particles and the alkali metal sulphide-containing solids into a second coking reactor 10 operating at 550 700 C., located beneath reactor 6, and provided with a fluidized bed 11, where the carbonaceous residue and alkali metal sulphide is converted into desulphurized light oil and coke particles containing alkali metal carbonate and little volatile component; returning the desulphurized light oil from the second to the first reactor to recover desulphurized gas and light oil; transferring the coke particles from reactor 10 into an alkali metal sulphide regeneration reactor 23 operating at 600 to 800 C. when the coke is reacted with a hot fuel gas transferred from a heating and gasifying reactor 17 located beneath reactor 23 thereby converting the sulphur in the alkali metal sulphide into hydrogen sulfide and recovering hydrogen sulfide-containing fuel gas, transferring the coke particles into the reactor 17 which is provided with a fluidized bed 18 operating at 700 to 1,000 C. wherein most of the coke is converted into fuel gas which is fed into regeneration reactor 23 and recycling the alkali metal carbonate-containing particles from which most of the coke particles have been removed to coking reactor 10. Small particles are transferred to the upper layer of the respective reactors and large particles to the settling section of the reactors by utilizing the grading function of the fluidized bed, large particles collected at the settling section in the upper reactor are transferred by gravity into the lower reactor and small particles collected in the upper layer of the lower reactor are transferred into the upper reactor by the vapour phase formed between the first coking reactor 6 and the second coking reactor 10 and between the regeneration reactor 23 and the heating and gasifying reactor 17 thereby supplying necessary quantities of the particles and heat. A portion of the heavy oil is supplied into the first coking reactor 6 through a nozzle 2 on the head thereof, and the remaining portion is supplied through a nozzle 3 on the side wall of the reactor thus improving the dispersion of the heavy oil through the particles in the reactor. The upper portion of the first coking reactor 6 includes a steam admission region, a decomposition gas oil spray region, and a deceleration chamber wherein cooling and washing of the desulfurized decomposition products are effected.