Search

Summary: A generally valid mathematical model on physicochemical principles is proposed for a multi-stage countercurrent-extraction plant. The model is based on the relaxation technique and is applied to the extractive processing of low-concentrated acetic acid. An analogue computer is employed for the process simulation. As a result, optimum conditions at minimum costs are presented and possible corrections for analysis and concept are discussed.

In the electron-spin resonance spectra of degassed coal asymmetrical dispersion and adsorption signals are observed pointing to a superposition of several resonance lines at different resonance positions. An analogy computer program has been developed for obtaining the parameters of these signals. This program compares an iteratively varied model function of two superimposed Lorentz curves of different width and resonance position with the experimental data and achieves an optimium compensation on basis of the minimum error square integral. The principle circuit and results of the calculation are presented.