Fused chemical reactions are reactions that undergo a delay before significant amounts of product are produced. One class of fused chemical reactions is the class of reactions triggered by an abrupt release of a catalyst. Fused chemical reactions have the potential of solving the problem of organic deposition in sub-sea pipelines which is a problem with enormous economic consequence (Singh, P.; Fogler, H. S. Ind. Eng. Chem. Res. 1998, 37 (6), 2203). The reaction between ammonium chloride and sodium nitrite catalyzed by citric acid was chosen as an example of a fused chemical reaction system where the acid was encapsulated in polymer-coated gelatin capsules. The timed release of the acid catalyst was achieved by putting an additional polymeric coating on the gelatin capsules. The reaction kinetics and the polymer dissolution kinetics were investigated in an adiabatic batch reactor. An excellent agreement between simulation and experimental results in the batch reactor was achieved. Experimental results in a flow-loop reactor demonstrated that the fused chemical reaction could provide a substantial amount of heat in situ. This amount of heat is sufficient to overcome the high heat loss to the surroundings and to raise the temperature of the fluid above the effective temperature to soften and melt the wax deposit. The delay in heat release was found to depend on the thickness of the polymeric coating, while the amount and rate of heat release depended on the in situ reactant and acid concentrations.