He then left Ghana after a year to North Carolina to pursue his master's degree in chemical engineering specializing in liquid carbon dioxide (liq-CO2) separation and recovery from process solutions without phase change enhanced by micelles in a crossflow microfiltration.

[9] In 2003 he enrolled at the University of Cincinnati-Ohio's PhD chemical engineering program specializing in membrane science & technology specifically assessing solvent resistant polymeric nanofiltration membranes for small molecule purification and solvent recovery for re-use and other specialties.

[11] His contribution included the use of acoustics, specifically ultrasonic time-domain reflectometry (UDTR) for real-time investigation of solvent resistant polymeric membranes behaviors under compaction or swelling in organic environment.

Anim-Mensah used this already known UDTR technique for real-time studying of these specific polymeric membranes mechanical behavior while permeated during separation.

[12] Anim-Mensah is involved in some thirty (30) inventions secured by US and international patents in areas including sensing, energy recovery, improved chemical & water use efficiencies, refrigeration & heat pumps, optimization, process & product improvements, waste minimization, and environmental impacts reduction.

[23] He was featured on "Africa Must Industrialize Now: The Urgency for Value Addition to Africa Products" Webinar by AfCFTA Policy Network which featured Thomas Mensah (engineer) of Ghana, and Alvin Alexander, system engineer and founder at Orion Applied Science & Technology OrionAST.