Intensification of a solvent recovery technology through the use of hybrid equipment

Peter Mizsey, Agnes Szanyi, Andreas Raab, Jozsef Manczinger, Zsolt Fonyo

Research output: Chapter in Book/Report/Conference proceedingChapter

7 Citations (Scopus)


In printing companies often different four-component-mixtures (mixture 1: ethanol, ethyl acetate, isopropyl acetate, and water, mixture 2: ethanol, ethyl acetate, methyl-ethyl-ketone, and water) arise as waste. The recovery of the individual components is complicated by the highly nonideal feature of the mixtures, namely several binary and ternary azeotropes are formed by the components. Based on the synthesis procedure proposed by Rev et al. (1994) and Mizsey et al. (1997), new separation processes using hybrid separation techniques are developed followed up the vapour-liquid-liquid equilibrium behavior of the mixtures. The first process (ternary-cut-system) splits mixture 1 into two ternary mixtures which are separated later in subsequent units into components of the prescribed purity (∼95%). This technology needs, however, seven distillation columns and two extractors. The second separation process is based on two coupled columns and a three-phase-flash (two-column-system) which can cope with the separation of both mixtures into binary mixtures and the binaries can be easily separated further with conventional methods. Both processes are using extra water addition for the necessary separation. These processes are experimentally also verified (Mizsey et al., 1997, Raab, 2001). A third integrated separation process is developed with evolutionary steps merging the extractor and distillation units, designed for the ternary-cut-system, into integrated extractive distillationprocess using water as extractive agent (integrated-system). The integrated-system can separate both mixtures into components of the prescribed purity and consists of only four distillation columns. Beside the simpler separation structure the energy consumption is also investigated and compared with the other two processes. The use of this innovative solvent recovery process makes the reduction of the number of processing units possible and operating costs can be significantly reduced compared to the other non-integrated separation technologies.

Original languageEnglish
Title of host publicationComputer Aided Chemical Engineering
Number of pages6
Publication statusPublished - Jan 1 2002

Publication series

NameComputer Aided Chemical Engineering
ISSN (Print)1570-7946


ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications

Cite this

Mizsey, P., Szanyi, A., Raab, A., Manczinger, J., & Fonyo, Z. (2002). Intensification of a solvent recovery technology through the use of hybrid equipment. In Computer Aided Chemical Engineering (C ed., pp. 121-126). (Computer Aided Chemical Engineering; Vol. 10, No. C). Elsevier.