A Systematic Study of the Effect of Geometrical Parameters on Mixing Time in Oscillatory Baffled Columns

Ni, Xiongwei; Brogan, G.; Struthers, Allan D.; Bennett, Daniel; Wilson, Sophie

doi:10.1205/026387698525162

Cited by 67 publications

(96 citation statements)

References 22 publications

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Section: Introductionmentioning

confidence: 99%

“…Ni et al [5] reported that α ~ 0.25 resulted in the shortest mixing time. According to Baird and Stonestreet [9] a typical value of α is in the range of 0.2-0.4, but Ni et al [5] reported an optimal value of α = 0.20-0.22 (see Table 1). An energy dissipation and heat transfer study in OFRs used α = 0.34 [1] whilst α = 0.21 was used for a bioreactor application by Gaidhani et al [10].…”

Section: Introductionmentioning

confidence: 99%

“…Meso-scale OFRs are becoming considerably attractive for continuous catalytic and pharmaceutical manufacturing owing to their small volume and ability to cope with multiphase flows including particles and operate at low flow rates with reduced feed-stock materials and waste. Nonetheless, currently the design of OFRs relies on "rule of thumb" concepts established in the past two or three decades based on single, liquidphase dispersion [4] and mixing [5] studies which are actually paramount to establish the relationship between the inner baffled-tube geometry and solids flow, especially in mesoscale OFRs.…”

Section: Introductionmentioning

confidence: 99%

“…Baffle spacing has a significant effect on the behaviour of fluid as it determines the growth extent of generated eddies [5]; the vortices formed are unable to mix across the entire inter-baffle region if l/d is too small. Instead, eddies generated are distorted as a result of interaction with the baffles, therefore restraining the growth of vortices within each inter-baffle region [6].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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“…The batch configurations have been extensively described in literature [6,[34][35][36][37][38][39][40][41]. Table 2 lists the different parameters affecting droplet size and the correspondent correlations for oscillatory baffled reactor in batch.…”

Section: Introductionmentioning

confidence: 99%

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Lobry

Lasuye²,

Gourdon

et al. 2015

Chemical Engineering Journal

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.Liquid-liquid dispersion in a continuous oscillatory baffled reactor -Application to suspension polymerization b s t r a c tReducing energy costs, improving safety, minimizing waste are the current aims of chemical engineering. Process intensification in fine chemistry has been extensively studied but less work refers to heterogeneous reactions involving two liquid phases. This paper focuses on batch to continuous suspension polymerization transposition and especially on the liquid-liquid dispersion step. The main features of suspension polymerization reaction are based on (i) the initial liquid-liquid dispersion requiring a controlled size and narrow distribution and (ii) on the control of the final particle size during the agglomeration step by avoiding fouling which is a bottleneck for continuous flow. For the continuous transposition, liquid-liquid dispersion and reaction studies are carried out in continuous oscillatory baffled reactor (COBR) which is a multipurpose reactor. Its suitability to overcome the bottlenecks is demonstrated through the investigation of the oscillating and flow conditions or the dispersed phase holdup. A controlled droplet size distribution can be achieved. Oscillation is the main parameter responsible for droplet breakage. The suitable conditions to obtain stable dispersion are determined. For one of the first times, COBR is used for suspension polymerization.

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Inverse phase suspension polymerization of acrylamide in a batch oscillatory baffled reactor

Bennett

Symes³

et al. 2000

J. Appl. Polym. Sci.

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ABSTRACT:We report, for the first time, our experimental investigation of inverse phase suspension polymerization of acrylamide in a batch oscillatory baffled reactor. In such a reactor, the oscillatory motion is achieved by moving a set of orifice baffles up and down the column at the top of the reactor. The effects of both operational and design parameters on the mean particle size and size distribution of polymer beads were investigated, including oscillation amplitude, oscillation frequency, baffle spacing, baffle free area, and monomer addition time. The experimental results indicated that the mean particle size and size distribution of the polymer beads depended predominantly on the product of oscillation frequency and amplitude, i.e., the oscillation velocity. The size distributions are narrow and of essentially a Gaussian distribution. The level of fines produced is consistently less than 1% for all 100 experiments performed. We demonstrated that the mean particle size and size distribution in an oscillatory baffled reactor can be controlled precisely by simply selecting the appropriate oscillation velocity. The effect of the baffle spacing on the mean particle size is much less compared with that of the baffle free area. The monomer injection time has a noticeable influence on the mean particle size, but the rate of change is relatively small.

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A Systematic Study of the Effect of Geometrical Parameters on Mixing Time in Oscillatory Baffled Columns

Cited by 67 publications

References 22 publications

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Liquid–liquid dispersion in a continuous oscillatory baffled reactor – Application to suspension polymerization

Inverse phase suspension polymerization of acrylamide in a batch oscillatory baffled reactor

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