This PSE symposium is a triennial international conference series on process systems engineering. The conference was initiated in Kyoto, Japan at 1982. The conference is organized by the PSE Executive Committee with representation from the Asian Pacific Confederation of Chemical Engineering, the European Federation of Chemical Engineering, and the Inter American Confederation of Chemical Engineering. The previous conferences were held in San Diego, California, USA (2018), Copenhagen, Denmark (2015), Singapore (2012), Salvador-Bahia, Brazil (2009), Garmisch-Partenkirchen, Germany (2006), Kunming, China (2003), Keystone, USA (2000), Tronheim, Norway (1997), Kyongju, Korea (1994), Montebello, Canada (1991), Sydney, Australia (1998), Cambridge, England (1985), and Kyoto, Japan (1982).