HCl Oxidation To Recycle Cl₂ over a Cu/Ce Composite Oxide Catalyst. Part 2. Single-Tube-Reactor Simulation

Abstract

The pilot test is an important procedure that ultimately leads to implementation of an optimized catalytic process. A global reaction rate was calculated from the intrinsic kinetic rate with the effectiveness factor, and the calculated value is fitted well with the experimental data, which indicates that the global reaction rate is reliable. Further, a scale-up HCl oxidation experiment has been carried out in a single-tube reactor with an inner diameter of 22 mm using shaped CeO 2 −CuO/Y as the catalyst. A one-dimensional fixed-bed model based on the global reaction rate was adopted to properly describe the reaction behavior in the single-tube reactor. The results have laid a valuable foundation for the industrial reactor designation and the process optimization of HCl oxidation.

Reaction Kinetics of HCl Catalytic Oxidation over a Supported Cu-Based Composite Industrial Catalyst

“…The kinetic model is applied in the simulated optimization of the tubular fixed-bed reactor. , The structure of the tubular fixed-bed reactor is shown in Figure , where catalyst is loaded in reaction pipes (φ32 × 2 in diameter, 3 m in length). The technology parameters are designed as follows: inside reaction pipes, reaction temperature T of 380 °C, reaction pressure P of 0.1 MPa, reactant molar ratio n HCl / n O 2 of 2, and HCl space velocity F HCl0 / W of 450 L (kg of catalyst) −1 h –1 ; outside reaction pipes, 40% NaNO 2 /60% KNO 3 molten salt used for heat transfer, molten salt flow rate F s of 16 m 3 /h, and molten salt temperature T s of 355 °C.…”

“…The active components and promoters are supported on the γ-Al 2 O 3 carrier with a diameter of 2 mm. In the prior test performed by Chlor-Alkali Chemical Co., Ltd., via simulation of the industrial reaction conditions, the long period performance of the catalyst activity has been evaluated on a single-tube reactor . The results show that the average HCl conversion is 75% and there is no obvious change in the long duration, which indicates the catalyst activity is stable.…”

Optimization Strategies in a Fixed-Bed Reactor for HCl Oxidation

“…Simulation of a single-tube reactor for HCl oxidation using CeO 2 –CuO/Y catalyst was reported earlier by Chen et al The material, energy,and momentum balance equations have been reported as follows (eqs –): …”