Question 1

What is the role of CFD simulation in process optimization?

Accepted Answer

CFD (Computational Fluid Dynamics) simulation numerically models flow patterns, temperature distribution, mass transfer efficiency and mixing homogeneity inside reactors and mixers, enabling process parameters to be optimized without building physical prototypes. It significantly reduces design time and cost in fermentation, crystallization, polymerization and hydrogenation processes.

Question 2

How is mixer selection done for fermentation processes?

Accepted Answer

Mixer selection for fermentation processes takes into account oxygen transfer rate (kLa), shear stress sensitivity, foam control and scale-up requirements. Rushton turbines and concave disk turbines are preferred for aerobic processes, while low-shear axial flow impellers are chosen for cell culture applications.

Question 3

How is particle size controlled in a crystallization process?

Accepted Answer

Particle size distribution (PSD) in crystallization is controlled through cooling rate, supersaturation profile, mixing intensity and the nucleation-growth balance. CFD simulation optimizes local supersaturation zones and mixing homogeneity inside the reactor to achieve the desired crystal size and morphology.

Question 4

Which mixer is used in high-viscosity polymerization processes?

Accepted Answer

High-viscosity polymerization processes (above 100,000 cP) use helical ribbon, anchor and double planetary mixers. As viscosity increases the flow regime transitions from turbulent to laminar; in this case close-clearance mixers are critical for heat transfer and mixing homogeneity.

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