Abstract Many hydrogenation processes encounter challenges in maintaining a uniform temperature and concentration field in high‐pressure reactors to obtain good catalytic performance and avoid deactivation. Leveraging the exceptional fluidization and transport capabilities, high‐pressure fluidized beds offer a promising solution and have received increasing attention. In this work, we developed a pulse‐response method coupled with a series of optical techniques that enable high‐resolution spatial and temporal analysis of the residence time distribution (RTD) and its corresponding local gas–solid phase structural characteristics. An increase in pressure induces a distinct redistribution of gas between the two phases and bubble instability, shifting the RTD curves from long‐tailed to normal distributions. The proposed bimodal dispersion model successfully correlates gas dispersal behavior with the reconstruction of two phases at high pressure. Through correlations, pilot testing, and computational simulations to increase its practical value, the model has the potential to offer guidance on industrial hydrogenation processes.
Lu et al. (Sun,) studied this question.