Power consumption and gas–liquid mass transfer in a hot-sparged three-phase stirred reactor

Zhang, Jinjin; Wang, Dengfei; Gao, Zhengming; Cai, Yating; Cai, Ziqi; Bao, Yuyun

doi:10.1016/j.powtec.2019.05.065

Cited by 7 publications

(4 citation statements)

References 61 publications

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“…A DO probe (LeiCi DO JPSJ-605, Shanghai REX Sensor Technology Co., China) was used to measure the concentration of the dissolved oxygen, and the data were recorded by a computer. When the steady-state condition of equilibrium between the sulfite and oxygen dissolution is reached, the volumetric mass transfer coefficient ( k L a ′) is calculated by where Q s is the feed rate of the sulfite solution (m 3 ·s –1 ), C s is the concentration of sulfite in the feed solution (mol·m –3 ), V is the volume of the liquid in the aerated stirred tank (m 3 ), C Ai is the equilibrium concentration of oxygen at the gas–liquid interface (mol·m –3 ), and C As is the oxygen concentration measured in water at the steady state with the sulfite solution fed continuously (mol·m –3 ).…”

Section: Methodsmentioning

confidence: 99%

Section: Measurement Of the Volumetric Mass Transfer Coefficient (K L A)mentioning

confidence: 99%

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Experimental and Numerical Investigation of the Characteristics of Novel Disc Turbines in Aerated Stirred Tanks

Jia

Zhang

Guo

et al. 2023

Ind. Eng. Chem. Res.

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In this work, the gas dispersion and transport characteristics of three different disc turbines, namely, parabolic disc turbine (PDT), novel swept-back parabolic disc turbine (SPDT), and staggered fan-shaped parabolic disc turbine (SFPDT), are characterized by experiments and two-fluid model/RANS simulations. The physical explanation of the superior power characteristics of SFPDT and SPDT is elaborated using the pressure distribution and drag force coefficient on a blade surface. Gas−liquid performance parameters such as critical dispersion speed, relative power demand (RPD), and volumetric mass transfer coefficient are assessed under different conditions. The results show that SFPDT and SPDT can produce smaller flow separation regions and trailing vortices, resulting in smaller gas cavities under aeration conditions. SFPDT has the lowest critical dispersion speed under a high flow rate, while SPDT consumes the least power. Both SFPDT and SPDT exert roughly 7% higher gassed power input than PDT under aeration conditions and have higher efficiency on gas−liquid mass transfer than PDT. Moreover, empirical correlations from experimental data for SFPDT and SPDT are presented to provide a reference to the design of industrial stirred tanks.

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Section: Methodsmentioning

confidence: 99%

Section: Measurement Of the Volumetric Mass Transfer Coefficient (K L A)mentioning

confidence: 99%

Experimental and Numerical Investigation of the Characteristics of Novel Disc Turbines in Aerated Stirred Tanks

Jia

Zhang

Guo

et al. 2023

Ind. Eng. Chem. Res.

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“…The literature sources are diverse in opinion on the influence of solid particles on mass transfer. According to some of the published articles, k L a decreases in the presence of a solid phase in all conditions 4–7 or k L a decreases only at high concentrations of the solid phase or only at low impeller speeds 8. On the other hand, Gollakota et al 9 reported that k L a increases with the addition of solids.…”

Section: Introductionmentioning

confidence: 99%

“…Multiple authors also reported a small or no effect of the solid phase on the volumetric mass transfer coefficient 11–13. The increasing industrial importance of gas‐liquid‐solid systems has led to a focussed interest on the solid phase influence in such systems during the last couple of years 4, 14, 15. However, the mass transfer in gas‐liquid‐solid systems has not been fully described and understood, yet.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Prediction in a Mechanically Stirred Gas‐Liquid Reactor Containing Solid Particles

et al. 2021

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Microorganisms are used in various fermentation processes for the production of biochemicals and food. These types of processes take place predominantly in mechanically agitated vessels. An important transport characteristic is the volumetric mass transfer coefficient kLa. Many correlations are available in the literature to estimate parameters in a gas‐liquid system; however, three‐phase systems are not sufficiently described. The experiments were carried out under laboratory conditions in a single‐impeller mechanically agitated vessel with an internal diameter of 0.29 m. The solid phase was either cellulose, with two different particle sizes, or glass beads. An updated correlation is proposed that could be adopted in the design and scale‐up of agitated devices operating in the presence of solid particles.

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An efficient technology for dye intermediate production: Process intensification of catalytic hydrogenation of aromatic nitrocompounds in a rotating packed bed reactor

Zhang,

Zhou,

Zheng

et al. 2024

AIChE Journal

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The rotating packed bed (RPB) is suitable for catalytic hydrogenation of aromatic nitrocompounds whose reaction rate is limited by the mass transfer rate. However, the matching mechanism between the mass transfer rate and intrinsic reaction rate in the RPB reactor is still unclear. In this work, the matching relationship in the RPB reactor is studied by combining the characteristics of mass transfer and reaction in detail. Effects of various operating conditions on the gas–liquid mass transfer coefficient up to 0.31/s, under working conditions were studied and the mass transfer correlation was proposed. The hydrogenation of p‐nitroanisole was used as a probe reaction to analyze the matching mechanism. Various aromatic nitrocompounds in the RPB and stirred tank reactors were investigated. The reaction efficiency of the former is 5–20 times that of the latter, which further explained the universality of the matching mechanism in the RPB reactor.

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Power consumption and gas–liquid mass transfer in a hot-sparged three-phase stirred reactor

Cited by 7 publications

References 61 publications

Experimental and Numerical Investigation of the Characteristics of Novel Disc Turbines in Aerated Stirred Tanks

Experimental and Numerical Investigation of the Characteristics of Novel Disc Turbines in Aerated Stirred Tanks

Mass Transfer Prediction in a Mechanically Stirred Gas‐Liquid Reactor Containing Solid Particles

An efficient technology for dye intermediate production: Process intensification of catalytic hydrogenation of aromatic nitrocompounds in a rotating packed bed reactor

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