Analysis of Hydrodynamic Parameters Effect on the Hydropurification Reactor Operation through Numerical Simulation

Abstract In the class of three-phase catalytic reactors, trickle-bed reactors (TBRs) are the most extensively used in industry. They are utilized in petrochemicals, petroleum, chemicals, waste treatment, electrochemical and biochemical processing, and many other applications. One of the most significant applications of TBRs is their utilization in the process of purification. Since the purified product has to meet the required specifications of a high quality chemical, the TBRs operation control is very critical. Considerable fluctuation of the operating parameters values adversely affects the reactor efficient performance. In this paper, the effect of hydrodynamic parameters on the hydropurification TBR operation is investigated considering the product quality. A first principle heterogeneous model incorporating the hydrodynamic parameters and catalyst deactivation has been developed to analyze the reactor performance under the fluctuation of the hydrodynamic parameters. The devised model along with its mathematical solution has been coded into MATLAB R2016a environment. The results reveal that the deviation of hydrodynamic parameters of liquid holdup and gas holdup considerably influence the efficiency of the purified terephthalic acid reactor operation in term of product quality. Moreover, the impact of liquid holdup on the reactor operation is more than gas holdup in term of product quality. These research findings might be applied into an actual operating system mentioning that the deviation from trickling flow regime is to be avoided in the reactor.

[1]  Sharifah Rafidah Wan Alwi,et al.  Prediction of Pd/C Catalyst Deactivation Rate and Assessment of Optimal Operating Conditions of Industrial Hydropurification Process , 2015 .

[2]  W. Nicol,et al.  Trickle flow distribution and stability by X-ray radiography , 2007 .

[3]  A. K. Saroha.  Solid–liquid mass transfer studies in trickle bed reactors , 2010 .

[4]  Francesco Pinna,et al.  An investigation on Pd/C industrial catalysts for the purification of terephthalic acid , 1998 .

[5]  W. Nicol,et al.  Parallel hydrogenation for the quantification of wetting efficiency and liquid–solid mass transfer in a trickle‐bed reactor , 2011 .

[6]  Lynn F. Gladden,et al.  Mechanism of the trickle‐to‐pulse flow transition in fixed‐bed reactors , 2006 .

[7]  Vivek V. Ranade,et al.  Hydrodynamics of Trickle-Bed Reactors: Experiments and CFD Modeling , 2005 .

[8]  G. Fieg,et al.  Modeling and experimental validation of hydrodynamics in an ultrasonic batch reactor. , 2016, Ultrasonics sonochemistry.

[9]  Klaus Schnitzlein,et al.  A new model for the design and analysis of trickle bed reactors , 2012 .

[10]  Faïçal Larachi,et al.  High-Pressure Trickle-Bed Reactors: A Review , 1997 .

[11]  Abbas Azarpour,et al.  Performance analysis of crude terephthalic acid hydropurification in an industrial trickle-bed reactor experiencing catalyst deactivation , 2012 .

[12]  F. Larachi,et al.  Influence of temperature on fast-mode cyclic operation hydrodynamics in trickle-bed reactors , 2008 .

[13]  Jinghong Zhou,et al.  Terephthalic acid hydropurification over Pd/C catalyst , 2006 .

[14]  M. Rahim,et al.  A brief review of para-xylene oxidation to terephthalic acid as a model of primary C–H bond activation , 2014 .

[15]  Ville Alopaeus,et al.  CFD modeling of radial spreading of flow in trickle-bed reactors due to mechanical and capillary dispersion , 2009 .

[16]  A. Heidari,et al.  Numerical and Experimental Study of Catalyst Loading and Body Effects on a Gas‐Liquid Trickle‐Flow Bed , 2013 .

[17]  Faïçal Larachi,et al.  Hydrodynamics of co-current two-phase flow in an inclined rotating tubular fixed bed reactor — Wetting intermittency via periodic catalyst immersion , 2015 .

[18]  Zhang Shao-gang,et al.  Mathematical Simulation of HydrOrefining Reactor for Terephthalic Acid , 2008 .