Performance Characteristics of a Stirred-Tank Reactor with a Mechanical Foam-Breaker Utilizing Shear Force

Takesono, Satoshi; Onodera, Masayuki; Yoshida, Masanori; Yamagiwa, Kazuaki; Ohkawa, Akira

doi:10.1252/jcej.37.1488

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…Antifoam agents have been used to control foaming (Andrew, 1982;Koide et al, 1985). Various designs of mechanical breakers have been also used to control foaming (Ghildyal et al, 1988;Takesono et al, 2004). Hydrophobic particles have been used to control foaming in an ethanol \water\air mixture flowing into a vertical pipe at ambient conditions (Mata and Joseph, 1999).…”

Section: Figure1 Ebullated Bed Reactor Systemmentioning

confidence: 99%

Study on The Effect of Solid Properties on The Hydrodynamics in an Ebullated Bed Reactor

Mahmod¹,

Abdulrahman

Abid

2021

JER is an international, peer-reviewed journal that publishes f

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Published data on the hydrodynamics of ebullated- bed reactors (EBRs) used in the H-Oil process are scarce. In the present work, the effect of solid properties (e.g., particle size, and degree of hydrophobicity) on the hydrodynamics and foaminess in a lab-scale cold model of an (EBR) was investigated. 20wt. % MgSO4 solution was utilized as the liquid phase to imitate the hydrodynamic trends in the industrial-scale EBR of the hydro-conversion process. Experimental results depicted that the flow regime of the multiphase system can be readily evaluated by using the pressure drop technique. The turning from the bubbly to the turbulent system is enhanced with diminishing particle size, and decreasing particle hydrophobicity. Moreover, the degree of particle hydrophobicity was inversely proportional to the average gas holdup in the EBR. The reduction in average gas holdup was 7.9 % using hydrophobic particles more than that of the hydrophilic one. In the EBR, it was found that bubble sizes were increased with both gas velocity and the axial location far from the gas distributor while liquid velocity has negative impact on bubble size. The experimental work revealed that hydrophobic particles of smaller size (250 μrm) reduced foaming by 70% using 20 vol. % of solid loading and gas and liquid velocities of 10 and 0.15 cm s-1 respectively. This outcome revealed that the surface of catalyst particles used can be modified to act as foaminess- reducer in fluidized bed hydro conversion reactors.

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