Continuous solute fractionation with membrane cascades – A high productivity alternative to diafiltration

Siew, Weiming Eugene; Livingston, Andrew G.; Ates, C.; Merschaert, Alain

doi:10.1016/j.seppur.2012.09.017

Cited by 54 publications

(50 citation statements)

References 27 publications

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“…In fact, analyzing GMT NC‐1 membrane before and after use revealed that deposits of viscous lignin oil and solids were formed (Figure ). Tentatively, the increase in rejection rates with solute concentration can also be attributed to the rise in resistance towards the permeation of solutes associated with the formation of lignin‐species deposits on the membrane surface . To prevent the buildup of this resistance layer, the application of pressure pulses is a feasible process option.…”

Section: Resultsmentioning

confidence: 99%

“…Te ntatively,t he increase in rejection rates with solute concentrationc an also be attributed to the rise in resistancet owards the permeation of solutes associated with the formation of lignin-species deposits on the membranes urface. [39] To prevent the buildup of this resistance layer,t he applicationo fp ressure pulses is af easible process option. Indeed, pressure pulses have been applied to membrane filtration with excellent results fort he filtration of even more challenging systemst han the liquor obtained by lignin-first biorefining techniques.…”

Section: Resultsmentioning

confidence: 99%

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Membrane Fractionation of Liquors from Lignin‐First Biorefining

et al. 2019

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For the utilization of each lignin fraction in the lignin liquors, the development of separation strategies to fractionate the lignin streams by molecular weight ranges constitutes a timely challenge to be tackled. Herein, membrane filtration was applied to the refining of lignin streams obtained from a lignin‐first biorefining process based on H‐transfer reactions catalyzed by Raney Ni, by using 2‐PrOH as a part of the lignin extraction liquor and as an H‐donor. A two‐stage membrane cascade was considered to separate and concentrate the monophenol‐rich fraction from the liquor. Building on the results, an economic evaluation of the potential of membrane filtration for the refining of lignin streams was undertaken. In this proof‐of‐concept report, a detailed analysis is presented of future developments in the performance required for the utilization of membrane filtration for lignin refining and, more aspiringly, solvent reclamation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Membrane Fractionation of Liquors from Lignin‐First Biorefining

et al. 2019

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“…To overcome this insufficient selectivity, membrane cascades can be used. The principle of a cascade is as follows: at least one of the two obtained fractions of a single OSN step can be retreated by a second membrane arranged in a special configuration towards the previous one and this can be repeated (see below) until the goal achievement [11][12][13][14][15][16][17]. For instance, the group of Livingston in UK succeeded to run continuous three-stage membrane cascades for solvent exchange (exchange of a solute from toluene to methanol with a Starmem 122 polyimide membrane [14]).…”

Section: Introductionmentioning

confidence: 99%

“…There is no conceptual limitation to imagine more or less complex cascades and for instance, some authors focused on superstructure membrane cascades that were optimized to simultaneously determine the process structure (number of stages and location of the recycle streams) and operating variables according to specified separation goals [19]. Attempts to rationally design membrane cascades have been done thanks to several adaptations of the method of McCabe-Thiele, usually used for distillation [12,13,20,21,22]. However, the method was highlighted to be complex because of many parameters that have to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Assessment and potential of membrane cascades for organic solvent nanofiltration of hydroformylation media through a graphical representation composed of performance maps

Lejeune

Rabiller-Baudry

Renouard

et al. 2018

Chemical Engineering Science

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et al.. Assessment and potential of membrane cascades for organic solvent nanofiltration of hydroformylation media through a graphical representation composed of performance maps. Chemical Engineering Science, Elsevier, 2018, 183, pp. AbstractThis paper aims at proposing a graphical representation composed of several performance maps to help to answer to some current questions that can puzzle membrane end-users facing the arrangement of membranes in cascade in order to better master separation of complex media. Indeed, different compromises can be highlighted according to realistic goals for the separation such as quality and recovery yield of each fraction/component, energy consumption and required membrane area. This representation needed first the systematic simulations of cascades of pre-selected configurations. These last ones were chosen thanks to the target application field, namely the organic solvent nanofiltration of a final synthesis media of hydroformylation that is a homogeneous catalysed reaction. We voluntary assumed the a priori limitation of the number of stages to 5, anticipating that more complex cascades will probably be too expensive (both operating and capital costs). The graphical representation by itself is based on sets of six 2D-maps. Each map highlights relationships selected in an appropriate way between two of the six selected criteria: extraction/recovery, retentate/permeate quality/purity, membrane filtering area and overall energy consumption. For sake of illustration, the separation of 2 components C and A was considered. C/A has been chosen in a 1/1000 molar ratio, where C corresponds to the less retained component of the catalytic system that must be recovered in the retentate and A corresponds to the less transmitted product to extract in the permeate. In realistic nanofiltration conditions achieved in toluene, the rejections were experimentally determined on the initial media to filter. C has a high rejection (88%) whereas A has a low one (30%). The simulations of cascades were established using these constant values for rejection and the experimental permeate flux. For sake of an illustration of the use of the graphical representation, a case study was finally discussed regarding a given target of recovery for the two desired components, namely at least 99% of C recovery and better than 70% of A extraction. A complementary multi-criteria analysis was added aiming at facilitating the decision-making.2

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“…Vanneste et al proposed a batch‐wise fractionation cascade considering constant volume diafiltration in each stage. Siew et al reported on a three‐stage countercurrent stripping cascade to concentrate active pharmaceutical ingredients with minimum solvent consumption, while Kim et al used a two‐staged constant volume diafiltration cascade. Abejón et al applied a two‐staged countercurrent reverse osmosis membrane cascade to the separation of hydrogen peroxide and simulated cascades of up to five and seven stages.…”

Section: Introductionmentioning

confidence: 99%