Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1997-12-19
1999-12-21
Warden, Jill
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
B08B 900
Patent
active
060035285
ABSTRACT:
An improved method is provided for the thermo-chemical dewaxing a large dimension line or conduit using a Nitrogen Generation System/Emulsion. The method involves introducing an emulsion into the conduit to be waxed. The emulsion comprises an internal aqueous phase and an external organic phase. The aqueous phase comprises an oxidizing nitrogen salt, a reducing nitrogen salt and water. The organic phase comprises a non-polar organic liquid, such as kerosene, and a delayed action activator for inducing the reaction of said oxidizing nitrogen salt and said reducing nitrogen salt. The improvement comprises a delayed action activator which may be a copolyanhydride such as poly(adipic-co-sebacic)anhydride solubilized in a polar organic solvent such as chloroform. The solubilized delayed action activator is easily and accurately pumped into the conduit to be dewaxed. The emulsion is maintained in the conduit until the delayed action activator induces the reaction of the nitrogen salts to generate nitrogen and heat, thereby fluidizing wax in the conduit.
REFERENCES:
patent: 3669189 (1972-06-01), Fischer
patent: 4755230 (1988-07-01), Ashton et al.
patent: 5183581 (1993-02-01), Khalil et al.
patent: 5639313 (1997-06-01), Khalil
De Souza Celso Rodrigo
Khalil Carlos Nagib
Petroleo Brasileiro S.A. - Petrobras
Warden Jill
Wilkins Yolanda E.
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