Continuous Phase Mixing on Crossflow Extraction Sieve Trays

Eldridge, R. Bruce; Humphrey, J. L.; Fair, James R.

doi:10.1080/01496398708069002

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…For other types of extractors there has been a significant amount of investigation into mixing behavior, for example, the work of Miyauchi and Vermeulen on packed extractors. Preliminary results for sieve-tray mixing have been previously reported by the present authors …”

Section: Introductionsupporting

confidence: 72%

Sieve-Tray Extractor Continuous-Phase Mixing

and

Fair

1998

Ind. Eng. Chem. Res.

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The continuous-phase-mixing characteristics of a sieve-tray extractor were studied in a specially designed single-stage experimental apparatus. Two chemical systems were studied: toluene−water and n-butanol−water. The degree of continuous-phase axial mixing was determined for various tray geometries and phase flow rates. A predictive model was developed and combined with a point efficiency correlation to yield an overall tray efficiency. The results indicate that the level of continuous-phase mixing does not significantly affect the overall mass-transfer efficiency of an extractor sieve tray.

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Section: Introductionsupporting

confidence: 72%

Sieve-Tray Extractor Continuous-Phase Mixing

and

Fair

1998

Ind. Eng. Chem. Res.

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“…Combining these two equations gives the approximate elevation-dependent bubble catalytic surface in a molten metal: (9) This equation assumes insubstantial bubble coalescence, a phenomena that would alter bubble area A bubble . Sieve plates and/or impellers can disaggregate and avert bubble coalescence, as is common in extractive distillation [36][37][38].…”

Section: Reversible Catalytic Molten Methane Cracking Kineticsmentioning

confidence: 99%

Reversible Molten Catalytic Methane Cracking Applied to Commercial Solar-Thermal Receivers

et al. 2020

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When driven by sunlight, molten catalytic methane cracking can produce clean hydrogen fuel from natural gas without greenhouse emissions. To design solar methane crackers, a canonical plug flow reactor model was developed that spanned industrially relevant temperatures and pressures (1150–1350 Kelvin and 2–200 atmospheres). This model was then validated against published methane cracking data and used to screen power tower and beam-down reactor designs based on “Solar Two,” a renewables technology demonstrator from the 1990s. Overall, catalytic molten methane cracking is likely feasible in commercial beam-down solar reactors, but not power towers. The best beam-down reactor design was 9% efficient in the capture of sunlight as fungible hydrogen fuel, which approaches photovoltaic efficiencies. Conversely, the best discovered tower methane cracker was only 1.7% efficient. Thus, a beam-down reactor is likely tractable for solar methane cracking, whereas power tower configurations appear infeasible. However, the best simulated commercial reactors were heat transfer limited, not reaction limited. Efficiencies could be higher if heat bottlenecks are removed from solar methane cracker designs. This work sets benchmark conditions and performance for future solar reactor improvement via design innovation and multiphysics simulation.

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“…Descriptions of the models are given by Fair et al (1984) and by co-workers (1986,1989a,b). The effect of continuous- pitch/hole diameter 3 phase mixing on a crossflow sieve tray was studied by Eldridge (1986) and Eldridge et al (1987). The masstransfer efficiency of sieve trays under supercritical extraction conditions has also been investigated by Lahiere and Fair (1987), , .…”

Section: Previous Workmentioning

confidence: 99%

“…The model is based on the assumption of plug flow of the rising or falling drops and complete mixing of the continuous phase on the tray. It was found by Eldridge et al (1987) that for a range of interfacial tensions there was little if any enhancement of local efficiency due to crossflow effects such as axial dispersion. Thus, the conversion indicated in eq 3 is direct from local to overall efficiency.…”

Section: Model Developmentmentioning

confidence: 99%