Deposition of high molecular weight para±ns on the inner wall of subsea production and transportation pipelines continues to be a critical operati- onal problem faced by the petroleum industry. The accurate prediction of wax deposition rates and deposited wax spatial distribution would be an invaluable information for the design of subsea pipelines. A critical review of the literature conducted lead to the conclusion that there is not enough experimental evidence to determine which are the more relevant mecha- nisms responsible for wax deposition. However, the majority of available simulations employ the molecular diffusion model as the only deposition mechanism. Therefore, in the present work, a numerical analysis of the wax deposition in ducts is performed employing the molecular diffusion model and a comparison with experimental data of a simple and basic experiment in a rectangular cross section duct is performed. Two mathematical mo- dels are investigated; the first formulation is one- dimensional and the wax deposition rate is determined from the temperature gradient. The second formulation is two-dimensional and the wax deposition rate is a function of the para±n concentration gradient. The finite volume method was selec- ted to solve the conservation equations of mass, energy and mass fraction, coupled with a difusive equation to describe the growth of the wax deposi- tion. Additionally, the influence of the para±n latent heat was investigated. It was verified that the latent heat accelerates the deposition process, but does not affect thenal wax thickness after reaching the steady state regime. The results obtained presented signifficant differences between experiments and computation, indicating that molecular diffusion might not be the only relevant mechanism responsible for wax deposition.