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US 12,157,861 B2Granted
Fluid for tar hydroprocessing
AssigneeExxonMobil Chemical Patents Inc.
InventorsMaryam Peer Lachegurabi, Krystle J. Emanuele, Kapil Kandel, Frank Cheng-Yu Wang, Teng Xu
Life of this patent
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Abstract
Hydrocarbon-containing fluids are provided for use during solvent-assisted hydroprocessing of pyrolysis tar, such as steam cracker tar. The hydrocarbon-containing fluids can be used at any convenient time, such as during start-up of a pyrolysis process when recycled liquid pyrolysis product is not available; when the amount of liquid pyrolysis product available for recycle is not sufficient to maintain desired hydroprocessing conditions; and/or when the changes to the quality of the liquid pyrolysis product reduce the suitability of the recycle stream for use as a utility fluid.
Claims26
A pyrolysis tar processing method, comprising:
- mixing a tar feed with a utility fluid to produce a tar-fluid mixture, wherein the tar feed includes at least one tar, the utility fluid has a solubility blending number of 90 or more, a density of 0.98 g/cm3 or less, and a bromine number of less than 5, and the utility fluid comprises 30 wt. % or more of compounds with a ring class of 1.5 and 20 wt. % or less of compounds with a ring class of 1.0 or less;
- and
- hydroprocessing the tar-fluid mixture under solvent-assisted hydroprocessing conditions to form a hydroprocessed effluent, the hydroprocessed effluent comprising a mid-cut fraction having a solubility blending number of 90 or more, an initial boiling point of 150° C. or more, and a final boiling point of 400° C. or less.
A hydroprocessing method, comprising:
- mixing a pyrolysis tar feed with a utility fluid to produce a tar-fluid mixture, wherein the utility fluid has a solubility blending number of 90 or more, a density of 0.98 g/cm3 or less, and a bromine number of less than 5, and the utility fluid comprises 30 wt. % or more of compounds with a ring class of 1.5, 20 wt. % or less of compounds with a ring class of 1.0 or less, and 5.0 wt. % or less of aliphatic compounds;
- hydroprocessing the tar-fluid mixture under solvent-assisted hydroprocessing conditions to form a hydroprocessed effluent, the hydroprocessed effluent comprising a mid-cut fraction having a solubility blending number of 90 or more, an initial boiling point of 150° C. or more, and a final boiling point of 400° C. or less;
- separating a recycle fraction comprising the mid-cut fraction from the hydroprocessed effluent to form, the recycle fraction having a density greater than that of the utility fluid;
- mixing the recycle fraction with a second portion of feedstock;
- and
- hydroprocessing the mixture of the second portion of feedstock and the recycle fraction under the solvent-assisted hydroprocessing conditions to form a second hydroprocessed effluent, the second hydroprocessed effluent comprising a second mid-cut fraction having a solubility blending number of 90 or more, an initial boiling point of 150° C. or more, and a final boiling point of 400° C. or less.
3 more elements
A hydrocarbon upgrading process, comprising
- (a) providing a naphtha feed
- (b) reforming the naphtha to produce a reformate
- (c) separating an aromatics bottoms stream from the reformate, wherein (i) the aromatics bottoms stream comprising >30 wt. % of compounds with a ring class of 1.5 and ≤20 wt. % of compounds with a ring class of 1.0, based on the weight of the aromatics bottoms stream, and (ii) the hydrocarbon-containing fluid has a SBN ≥90, a density≤0.98 g/cm3, and a bromine number <5;
- (d) combining the aromatics bottoms stream and a tar feed to produce a tar-fluid mixture;
- (e) catalytically hydroprocessing the tar-fluid mixture to form a hydroprocessed effluent, the hydroprocessed effluent comprising a mid-cut fraction having a solubility blending number of 90 or more, an initial boiling point of 150° C. or more, and a final boiling point of 400° C. or less;
- (f) separating a recycle fraction comprising the mid-cut fraction from the hydroprocessed effluent to form, the recycle fraction having a density greater than that of the aromatics bottoms stream;
- (g) substituting the recycle fraction for at least a portion of the aromatics bottoms stream in step (c) to produce a second tar-fluid mixture;
- and
- (h) catalytically hydroprocessing the second tar-fluid mixture to form a second hydroprocessed effluent, the second hydroprocessed effluent comprising a second mid-cut fraction having a solubility blending number of 90 or more, an initial boiling point of 150° C. or more, and a final boiling point of 400° C. or less.
6 more elements
Dependencies are inferred from the claim text.