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OPHINA FUNDED PROJECTS plement distillation, the use of OSN for the separation of homogeneous ca- talysts and for product purification, and studies of possible hybrid processes. 3.7.3 Results The focus of the research project was initially on the membrane materials. The performance of a number of different membrane materials was studied and the results compiled in a property matrix that enabled the requirements of specific separation processes to be individually addressed without the need to invest in major development work. Any gaps in the property ma- trix were closed by developing and synthesising new membrane materials. Using this approach, three different substructures of highly selective mem- branes with a molecular weight cut-off between 250 g/mol and 800 g/mol were developed that have the potential to be used in a large number of OSN applications. Two generations of flat-sheet silicone composite membranes were also developed in response to the requirements of industrial users for membrane filtration operations. The flat-sheet materials were used to fabri- cate small-scale membrane modules for testing purposes. The performance of the membrane was not impaired by incorporation into the module. The materials used in the construction of the modules were selected to meet the requirements of most industrial processes. The larger modules with dimen- sions of 8“ x 40“ were developed in collaboration with the project partners Evonik MET and CUT. The sheet material and the modules were tested in a variety of processes. Of the 21 processes identified, 19 were subjected to detailed evaluation and the suitability of the membranes for use with each process was determined. In addition to examining the options for incorporating pure OSN equipment, project members also addressed the question of using membrane-based filt- ration to replace thermal separation techniques and analysed the possibility of combining OSN technology with other separation methods in novel hyb- rid processes. The economic feasibility of the various technological solutions was based on estimates of membrane filtration performance and length of service life. A four-week test under realistic operating conditions showed that the membrane module exhibited both long-term performance stability and solvent resistance. Modelling based on the measurement data collected was used to assess cost effectiveness and to identify the optimum process parameters. Of the 19 OSN applications examined in the Ophina project, commercial feasibi- lity could be demonstrated for a total of eight processes. The membranes and membrane modules tested showed good separation performance, high stability with respect to a range of different solvents and the potential to 233PDF Image | Chemical Processes and Use of CO2
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