There is substantial economic interest to optimize the operations of low-density polyethylene (LDPE) tubular reactors. Due to the high complexity of these units, systematic optimization techniques need to be used for this. One of the main limitations associated to this is the high dimensionality and complexity of the multi-zone tubular reactor model. In this work, we demonstrate that a simultan...

The kinetics of the esterification of n-butanol with acetic acid have been studied in a batch and in a tubular reactor. The best model for obtaining the esterification rate with a partially wet ion exchanger (270/o water contents) is obtained by assuming a pseudohomogeneous system, while the kinetics of dry ion exchangers is best represented by a model derived from assumptions based on a hetero...

a crude biosurfactant mixture was produced in a 1.4 l tubular reactor by a mixed culture; afterthe thermal treatment of the whole culture an increase in emulsification activity and surface tension wasobserved, with a main effect on the first one. the emulsification index of the mixture obtained was of 60.4 %. the crude mixed biosurfactant was used to enhance hydrocarbon biodegradation of intemp...

Since its discovery in the 1920s, the Fischer-Tropsch Synthesis (FTS) has undergone periods of rapid development and periods of inaction. Within ten years of the discovery, German companies were building commercial plants. The construction of these plants stopped about 1940 but existing plants continued to operate during WWII. Two types of reactors were used in the German commercial plants: the...

Divinylbenzene (DVB) is produced by catalytic dehydrogenation of DEB at high temperature and atmospheric pressure. Ethylvinylbenzene (EVB) is produced as a useful chemical during dehydrogenation of DEB. Also some other liquid and gaseous by products is produced during dehydrogenation. A set-up has been developed to conduct the DEB dehydrogenation reactions experiments to prepare DVB at differen...

Spatially resolved analysis of the composition of the gas-phase during chemical vapor deposition depends on an effective sampling apparatus. In the present work, a novel in-situ sampling and cooling apparatus was presented, which is connected directly to an online GC/MS. Simulations of the temperature distribution in the cooling apparatus show that sample gas can be cooled down to 600 K in shor...

In this study the catalytic dehydrogenation of ethylbenzene to styrene was investigated in a simulated tubular sodalite membrane reactor. The high quality microporous sodalite membrane was synthesized by direct hydrothermal method and characterized by single gas permeation measurements. The performance of the prepared membrane showed high potential for application in a dehydrogenation membrane ...

Simulation has a big importance nowadays when the speed of computers grows rapidly and the price is on the other hand decreasing. The paper is focused on the simulation of the steady-state and dynamic behaviour of the nonlinear system represented by the tubular chemical reactor with the co-current and countercurrent cooling in the jacket. These analyses are then used for the choice of the suita...

Using boundary conditions more general than those due to Danckwerts, the authors recently showed that significant variations may be encountered in the global stability characteristics of an axially dispersed adiabatic tubular reactor. The numerical results presented in this communication demonstrate that for a fixed initial state of the reactor, steady states very different from those predicted...

Tubular chemical reactor are units frequently used in chemical and biochemical industry. From the system theory point of view, tubular chemical reactors belong to a class of nonlinear distributed parameter systems. Their mathematical models are described by sets of nonlinear partial differential equations (PDR). The methods of modelling and simulation of such processes are described eg. in (Luy...