How and where to get you research work assessed for PhD? I completed a masters in Chemical Engineering long ago. I have since done some research which I think suffices to achieve a PhD. Can it be done (and how)?
How and where to get you research work assessed for PhD?


The first person to evaluate if the work is sufficient to warrant submitting it for official PhD evaluation is the PhD supervisor. Therefore you need to find a supervisor first.


  I have since done some research which I think suffices to achieve a PhD. Can it be done (and how)?


These things vary a lot by country and by institution, but it's common nowadays that the requirements for passing a PhD involve:


validating some classes (in particular about general scientific methods, ethics, etc.)
having published a few papers in peer-reviewed journals or conferences


The question doesn't specify whether the work has been published/peer-reviewed or not? If not, it's a bit risky to assume that it is sufficient for a PhD.