Closed loop cleaning system

Details Closed loop cleaning system Closed loop cleaning system

2005-02-22

2005-02-22

Stinson, Frankie L. (Department: 1746)

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

C134S022120, C134S040000, C134S16800C, C134S111000, C134S16900A

Reexamination Certificate

active

06858090

ABSTRACT:
Railroad tank cars that have contained petroleum products are cleaned of asphalt residues by a closed cleaning system. An initial spray of terpene-based solvent is followed by a water rinse. The solvent extracts hydrocarbons from the asphalt residue. The solvent and hydrocarbon are separated by filtration, stratification, and distillation, allowing reuse of clean solvent and sale of marketable oil products. The rinse water is cleaned by filtration and evaporation of solvent residues, allowing reuse of the water. The asphalt solids such as residual inorganics are removed by filtration as a dry product suited for disposal in a landfill.

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