Steam cracking of hydrocarbon feedstocks containing salt and/or particulate matter
AssigneeExxonMobil Chemical Patents Inc.
InventorsJames N. McCoy, Arthur R. Di Nicolantonio, James M. Frye, Melissa D. Stapleton, Richard C. Stell
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Abstract
A process for cracking a hydrocarbon feedstock containing salt and/or particulate matter, wherein said hydrocarbon feedstock containing salt and/or particulate matter is heated, then separated into a vapor phase and a liquid phase by flashing in a flash/separation vessel, separating and cracking the vapor phase which comprises less than about 98% of the hydrocarbon feedstock containing salt and/or particulate matter, and recovering cracked product. The salt and/or particulate matter are removed in the liquid bottoms stream from the flash/separation vessel.
Claims25
A process for cracking an undesalted hydrocarbon feedstock containing salt and/or particulate matter, said process comprising:
- a. heating said undesalted hydrocarbon feedstock containing salt and/or particulate matter;
- b. feeding the undesalted hydrocarbon feedstock containing salt and/or particulate matter to a flash/separation vessel;
- c. separating the undesalted hydrocarbon feedstock containing salt and/or particulate matter into a vapor phase and a liquid phase, said liquid phase comprising a sufficient portion of the undesalted hydrocarbon feedstock to maintain salt and/or particulate matter in suspension;
- d. removing the vapor phase from the flash/separation vessel;
- and
- e. cracking the vapor phase to produce an effluent comprising olefins.
A process for cracking an undesalted hydrocarbon feedstock containing salt, said undesalted hydrocarbon feedstock containing salt further comprising non-volatile components and said process comprising:
- a. heating said undesalted hydrocarbon feedstock containing salt to a first temperature;
- b. adding steam to the undesalted hydrocarbon feedstock containing salt;
- c. further heating the undesalted hydrocarbon feedstock containing salt to a second temperature greater than the first temperature, said second temperature being such that a sufficient portion of the undesalted hydrocarbon feedstock containing salt remains in the liquid phase to maintain salt in suspension;
- d. feeding the undesalted hydrocarbon feedstock containing salt to a flash/separation vessel;
- e. separating the undesalted hydrocarbon feedstock containing salt into a vapor phase and a liquid phase, said liquid phase being rich in nonvolatile components and salt and said vapor phase being substantially depleted of non-volatile components and salt;
- f. removing the vapor phase from the flash/separation vessel;
- g. adding steam to the vapor phase;
- and
- h. cracking the vapor phase in a radiant section of a pyrolysis furnace to produce an effluent comprising olefins, said pyrolysis furnace comprising a radiant section and a convection section.
Dependencies are inferred from the claim text.