Hi there

In response to your question if you're planning to do a specialisation or a master's degree in chemical engineering that would surely be possible and further you could supplement it with a PhD. Although the content vastness of chemistry through engineering sciences and basic sciences is quite different hence the if you switch later on you would need to grasp a lot of concepts in short period of time, hence it's advisable to look through the course work of chemical engineering to assess about your preparation and efforts.

Hope this answer helps; best wishes