At the 4th International Symposium on Multiscale Multiphase Process Engineering (MMPE), recent research progress on nano-, micro- and macro-scale aspects of multiphase process engineering will be presented and discussed. A strong emphasis is put on application-oriented research, bridging the gap between scientific findings and methodology and the requirements of industry. The International symposium on Multiscale Multiphase Process Engineering (MMPE) is held biannually alternately in Germany and Japan and regular attracts more than 100 participants from all over the world.