Chr. Kruse

Bio: Chr. Kruse is an academic researcher. The author has contributed to research in topics: Switchover & Distillation. The author has an hindex of 1, co-authored 1 publications receiving 19 citations.

Experimental and theoretical studies of the dynamics of startup and product switchover operations of distillation columns

Abstract: Experimental studies have been made with the help of laboratory-scale distillation columns of the startup and product switchover operations of distillation columns. The object of these studies was to minimize the time necessary from initial startup or product switchover for steady-state operations to be attained. It has been shown that the time needed can be clearly reduced by a specific mode of operation. Theoretical studies support the experimental findings. Dynamic simulation has proved to be a suitable aid for the preparation and planning of experimental studies. As a result, the time needed to reach steady state can be considerably reduced, and consequently the costs.

Startup of distillation columns using profile position control based on a nonlinear wave model

Abstract: Startup of distillation columns is a very challenging control problem because of its strong nonlinearity and a wide operating range during the transient period. A nonlinear wave model captures the essential dynamic behavior of the distillation process so that it is possible to deal with the difficulties encountered during startup operation. This paper is concerned with the startup of distillation systems using nonlinear wave model based control developed by Han and Park (AIChE J. 1993, 39 (5), 787). This control scheme uses profile positions as controlled variables and is based on the nonlinear wave model by Hwang (AIChE J. 1991, 37, 705) and generic model control scheme by Lee and Sullivan (Comput. Chem. Eng. 1988, 12, 573). It can be applied to a binary or a multicomponent distillation system that can be represented as a pseudobinary. The proposed control scheme is shown by simulation studies to provide a safe and economic startup operation not only for dual composition control of a simple distillation ...

Experimental study on multicomponent distillation in packed columns

Abstract: An extensive set of experimental data on multicomponent distillation with non-ideal systems in structured packed columns is presented to fill the gap of such data in literature. Experimental composition profiles along the column height obtained by distillation experiments with nonideal systems, methanol–2-propanol–water, methanol–acetonitrile–water, and acetone–methanol–2-propanol–water are reported. The distillation columns and the sampling technique are discussed in detail. An example how to use these data is shown by comparing the experimental data with simulation results when applying different mathematical models.

Startup Operation of Middle-Vessel Batch Distillation Column: Modeling and Simulation

Abstract: The objective of this article is to extensively analyze and discuss the startup of a middle-vessel batch distillation (MVBD) column by means of dynamic modeling and simulation. A rigorous model describing the entire process of an MVBD column including startup from ambient conditions is presented. The model considers the heating of the distillation column and peripheral equipment, as well as the formation and propagation of hydrodynamic and thermodynamic profiles. The physical validity is shown by comparison of simulation studies with experimental results. Sensitivity analyses are used to study startup operation and promote a deeper understanding of the process. General guidelines are provided to standardize and improve the process. The theoretical examinations offer the basis for the development of improved process control strategies and recipe-based automation concepts, as well as for dynamic optimization studies.