In conventional coke-oven gas scrubbing processes, the recovery of volatileorganic compounds (VOC) is carried out in absorption units in which complexmixtures of high boiling polyaromatic components are used as absorbents (coaltar oils ~ washing oil). Due to the number of components (here 400 up to 500),which are similar in their molecular weight and structure, and the lack of datadescribing the interactions of VOCs in this mixture, the determination ofactivity coefficients at infinite dilution and Henry coefficients, respectively, isan essential basic for process calculations. To overcome this problem, in thiswork, a stochastic search method is combined with a Quasi-Newton approach inorder to estimate the UNIFAC parameters which describe the interactionsbetween the washing oil (regarded as one type of pseudo-component) and thelight aromatic compounds. For this purpose, experimental studies were alsocarried out.
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