On behalf of the Organizing Committee, we are very pleased to invite you to the 9th World Congress of Chemical Engineering (WCCE9) to be held in Seoul, Korea from August 18 to 23, 2013. The Congress, on this occasion, also serves as the 15th Asian Pacific Confederation of Chemical Engineering Congress (APCChE2013). We have decided “Chemical Engineering: Key to the Future” as the central theme of the Congress. The scientific program will provide an opportunity for participants to exchange new ideas and information on many important issues in chemical engineering. High-standard plenary and keynote lectures will be provided by outstanding scholars invited both from academia and industry. The Congress will be an occasion for the participants to make new acquaintance and strengthen friendship. Seoul, the capital of Korea, is one of the most dynamic and safest cities in the world and has left a shining impression on public with its successful staging of the 1988 Summer Olympic, 2002 FIFA World Cup and G20 Summit in 2010. Excellent facilities and natural beauty combined with its 5000-year historical heritage will no doubt make Seoul an attractive place to visit, where the old and new coexist in harmony. The Organizing Committee will endeavor to put together an exciting social program for delegates and accompanying persons so that they all can carry home good memories of the occasion in Korea.