The waue model for longitudinal dispersion, published elsewhere as an alternative to the commonly used dispersed plug-flow model, is applied to the classic case of the laminar-flow tubular reactor. The results are compared in a wide range of situations to predictions by the dispersed plugflow model as well as to exact numerical calculations with the 2-0 model of the reactor and to other availab...

Low Density Polyethylene (LDPE) is produced by free radical polymerization. Industrially, LDPE polymerization process is usually carried out in a continuous mode (tubular or autoclave reactors) at high pressures (1300-3400 atm) and temperatures (50-340 0 C). LDPE exhibits a number of desirable properties, including high tensile strength, flexibility, high impact resistance, low crystallinity, l...

The plasma polymer films were prepared in the Typical Modular Reactor (TMR). Two modules of this reactor with different geometry were used – parallel plate electrode arrangement and tubular arrangement. The homogeneity in thickness and the same chemical structure were found in the former case in the area of the substrate plane, corresponding to the size of the excitation electrode. In the latte...

Tubular reactor stability is reconsidered for a wide variety of situations where there is dispersion outside the reactor.A complete set of boundary conditions are proposed from which the Danckwetts boundary conditions arise as a special case. While the multiplicity and stability characteristics are found to be the same as those found with Danckwerts boundary conditions (no dispersion outside th...

The reaction of ammonia decomposition and nitriding reaction as an example of the parallel reactions were studied. A surface reaction was assumed as the rate limiting step. The experiments were carried out in the range of temperatures from 623 to 723 K. Mixtures of different iron nitrides (gamma'-Fe(4)N, epsilon-Fe(3-2)N) were obtained. Differential tubular reactor with thermogravimetric (TG) m...

Ahstrct-Styrene maleic anhydride copolymers (SMACs) are of particular commercial and academic interest. The bulk copolymer&&ion reaction is characterized by a very fast reaction rate and an important gel effect. The copolymer has a strong tendency to be alternate when maleic anhydride is in excess. In order to obtain a copolymer with less than 50% of incorporated MA, a good quality of mixing mu...

Abstract Methane pyrolysis in an externally heated tubular reactor inevitably ends with clogging of the reactor. Thin molten metal wall films protect walls from carbon depositions. A falling film and a rotating are investigated by CFD simulation. The results show considerable advantages compared to vertical An alternative route for production methane is implementation exothermic chlorination re...

Heat and mass transfer problem in a fixed-bed tubular reactor is one of the major concerns in the chemical engineering. The two dimensional axial plug flow model was used for a water gas shift reactor to compare heat conduction or mass diffusion with convective effect. In the case of fast fluid flow in highly permeable catalyst-bed, convective heat transfer was dominant compared to heat conduct...