IMPROVED METHOD FOR THE THERMO-CHEMICAL DEWAXING OF LARGE DIMENSION LINES

摘要

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 dewaxed. The emulsion compris es 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 compris es a non-polar organic liquid, such as kerosene, and a delayed action activator for inducin g the reaction of said oxidizing nitrogen salt and said reducing nitrogen salt. The improvemen t 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.