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US 2026/0103642 A1Published application
Quench System Solvation
OwnerRodney S. Smith, Selma S. Lawrenceinventors
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Abstract
Methods are provided to reduce or minimize fouling within quench systems when quenching effluents containing heavy components, such as heavy hydrocarbons and/or pyrolysis tars/coke. The methods include injecting a low density, low boiling point, high aromatic content fluid into the quench system as a quench solvent. The quench solvent also has a reduced or minimized content of fouling precursors, such as styrene, cyclopentadiene, or dicyclopentadiene.
Claims22
A method for quenching a heavy hydrocarbon effluent, comprising:
- contacting a hydrocarbon effluent having an effluent temperature with quench water in a quench system to form an overhead gas and one or more additional fractions having a higher boiling range than the overhead gas, the overhead gas having an overhead gas temperature that is lower than the effluent temperature by 10° C. or more,
- mixing a quench solvent with the quench water prior to the contacting, during the contacting, after the contacting, or a combination thereof, at least one additional fraction of the one or more additional fractions further comprising at least a portion of the quench solvent, the quench solvent comprising i) 70 wt % or more of aromatics, ii) 0.0 wt % to 4.0 wt % of cyclopentadiene, dicyclopentadiene, or a combination thereof, iii) 0.0 wt % to 1.0 wt % of styrene, and iv) 5.0 wt % or more of combined paraffins and olefins, the quench solvent having a specific gravity at 15° C. of 0.92 or less, at least one of an initial boiling point of 62° C. or higher and a T10 distillation point of 80° C. or higher, and at least one of a final boiling point of 200° C. or lower and a T90 distillation point of 180° C. or lower;
- separating the at least one additional fraction to form at least a hydrocarbon-containing fraction and a quench recycle fraction.
A quench solvent comprising
- 70 wt % or more of aromatics,
- 0.0 wt % to 4.0 wt % of cyclopentadiene, dicyclopentadiene, or a combination thereof,
- 0.0 wt % to 1.0 wt % of styrene, and
- 5.0 wt % or more of combined paraffins and olefins,
- the quench solvent having a specific gravity at 15° C. of 0.92 or less, at least one of an initial boiling point of 62° C. or higher and a T10 distillation point of 80° C. or higher, and at least one of a final boiling point of 200° C. or lower and a T90 distillation point of 180° C. or lower.
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Dependencies are inferred from the claim text.