"Explore the theoretical principles governing mass and energy transfer phenomena in chemical engineering processes. Discuss the fundamental concepts of momentum, heat, and mass transfer, elucidating their significance in the design and optimization of chemical reactors, separation units, and other industrial systems. Evaluate the role of thermodynamics in predicting the feasibility and efficiency of chemical processes, considering factors such as equilibrium, phase behavior, and reaction kinetics. Additionally, analyze the influence of operating conditions, including temperature, pressure, and flow rates, on the performance and selectivity of chemical processes. Provide examples of innovative technologies or methodologies employed to enhance process efficiency and sustainability in contemporary chemical engineering applications, emphasizing their theoretical underpinnings and practical implications."