Theoretical frameworks underpin chemical engineering practices? Explore the foundational principles that guide chemical engineers in designing processes and developing materials. Investigate the thermodynamic, kinetic, and transport phenomena theories that form the backbone of chemical engineering. How do these theories elucidate the behavior of substances at the molecular level, facilitating the design and optimization of industrial processes? Consider the role of mathematical modeling in translating these theories into practical applications, enabling engineers to predict and manipulate chemical reactions and transport phenomena. Moreover, delve into how advancements in quantum chemistry and molecular simulation techniques contribute to refining theoretical frameworks in chemical engineering, allowing for more accurate predictions and innovative process designs. In essence, how do theoretical underpinnings empower chemical engineers to innovate and solve complex challenges in various industries, from pharmaceuticals to energy production?