where can I find ,best ranking of chemical engineering schools?

Answer 1

at schools whose highest degree is a bachelor's or master's:
1. Rose-Hulman Institute of Technology (IN)
2. Cooper Union (NY)
3. Bucknell University (PA)
4. Rowan University (NJ)
5. Lafayette College (PA)
Manhattan College (NY)
University of Minnesota: Duluth

at schools whose highest degree is a doctorate:
1. Massachusetts Institute of Technology
2. University of California: Berkeley
3. University of Minnesota: Twin Cities
4. University of Wisconsin: Madison
5. Stanford University (CA)

Answer 2

You might start by looking at the AIChE website - American Institute of Chemical Engineers.
http://www.aiche.org/