Can I do experimental research after doing a computational PhD in Chemical Engineering?
Especially in chemical engineering, it is definitely possible for people to move back and forth between experimental and computational work, and even to combine the two in a single career (although this is much more difficult, obviously).

Both of my graduate co-advisors have made similar transitions during their careers—from a mainly computational focus to a primarily experimental focus. It is definitely feasible.

The main issue that you'd want to remember at the earlier stage of your career is that the further away you want to leap from your PhD research, the harder it is to find someone willing to sponsor you to do that. For instance, doing an experimental PhD related to the topic of your computational PhD should not be too difficult; moving from computational combustion to experimental biomedical engineering would be much more challenging.