Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Reexamination Certificate
2011-07-12
2011-07-12
Carrillo, Sharidan (Department: 1711)
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
C134S019000, C134S022110, C134S022120, C134S022140, C134S022180, C134S022190, C134S034000, C134S036000, C134S040000, C134S042000
Reexamination Certificate
active
07976640
ABSTRACT:
A method for the on-line cleaning of a heat exchanger used with petroleum process fluids which create coke deposits of asphaltenic origin on the exchanger tubes. The asphaltenes are removed by re-dissolution in a solvent oil of high solubility power for the asphaltenes. Certain asphaltenic crudes are useful as solvents in view of their chemical similarity to the asphaltene coke precursors; also useful are refined petroleum fractions such as gas oils which are also characterized by their solvency for asphaltenes. The solvent oil may be admitted to the heat exchanger following withdrawal of the process fluid and then allowed to soak and dissolve the asphaltene coke precursors after which the resulting solution may be withdrawn and the exchanger returned to use without being at any time disconnected from its associated process unit.
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Brons Glen B.
Bryant Douglas P.
Meyer Douglas S.
Novosad Gary L.
Vick Ryan E.
Barrett Glenn T.
Carrillo Sharidan
ExxonMobil Research & Engineering Company
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