This paper presents the dynamic neural networks partial least squares (DNNPLS) as a strategy for open-loop identification of multivariable chemical processes that circumvent some of the difficulties associated with multivariable process control. The DNNPLS is an extension of the neural networks’ partial least squares (NNPLS) developed by Qin and McAvoy (Comp. Chem. Eng. 20 (1992) 379). Here, a ...

The paper is concerned with methanol synthesis from gas heterogeneous Cu/ZnO/AlO catalysts in an isothermal gradientless reactor. In a theoretical study the potential of forced periodic operation (FPO) for improving reactor performance terms production rate and yield explored. approach based on detailed kinetic model combines nonlinear frequency response (NFR) analysis rigorous numerical multi-...

This paper deals with the analysis of two tubular reactor models, the non isothermal tubular reactor model and a biochemical reactor model. It is shown in particular that multiple equilibrium profiles can be exhibited if the diffusion coefficients are large enough.

in this paper, control of a non-isothermal continuous stirred tank reactor in which two parallel autocatalytic reactions take place has been addressed. the reactor shows chaotic behavior for a certain set of reactor parameters. in order to control the product concentration, an optimal state feedback controller has been designed. since concentrations of reactor species are not measured, an obser...

Despite the fact that many methods have been developed for the optimization of process water networks, solving the problem simultaneously considering heat recovery has rarely been addressed. This paper presents a new approach for the simultaneous synthesis and optimization of heat integrated water networks. The procedure is based on mixed integer non-linear mathematical programming (MINLP). A n...

A nonlinear controller synthesis scheme is presented that retains the original spirit and characteristics of conventional (linear) model predictive control (MPC) while extending its capabilities to nonlinear systems. The scheme employs a Volterra model-a simple and convenient nonlinear extension of the linear convolution model employed by conventional MPC-and gives rise to a controller composed...

In two earlier papers, means were provided to decide the capacity of complex chemical reaction networks, taken with mass-action kinetics, to admit multiple equilibria in the context of the isothermal homogeneous continuous flow stirred tank reactor (CFSTR). In such a reactor, all species are deemed to be in the outflow, a fact which has an important bearing on the nature of the governing equati...