Prediction of leaching and filtration performance of drum filters

White, Daniel

doi:10.1016/0009-2509(76)80026-7

Cited by 3 publications

(2 citation statements)

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“…[1][2][3][4][5] Although they do include the analysis of important issues such as membrane resistance, drum/disc partitioning and hydrostatic head, they have limited use for compressible materials such as flocculated suspensions. Buscall and White 6 developed a phenomenological model for the dewatering of compressible materials in which the solid phase forms a continuous network of volume fraction / that has a physical strength called the compressive yield stress, p y (/).…”

Section: Introductionmentioning

confidence: 99%

Models of rotary vacuum drum and disc filters for flocculated suspensions

2011

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in Wiley Online Library (wileyonlinelibrary.com).Models for rotary drum and disc filtration of compressible suspensions are developed using one-dimensional compressional rheology theory. The models account for cake formation while the drum or disc is submerged in the feed slurry, saturated cake consolidation upon surfacing due to capillary pressure, and cake desaturation. Desaturation does not occur for vacuum pressures below a critical value given by the material properties, or is incomplete if the formation and consolidation angles are too large. The disc filter model is formulated by applying the drum filter solutions to concentric annuli. The effect of different operating parameters such as submerged depth, rotational rate, slurry concentration, and vacuum pressure are investigated. The throughput varies linearly or quadratically with the drum or disc radius respectively, proportionally with the square-root of the angular rotational speed and linearly with the submerged angle. The angles for cake consolidation and desaturation are independent of the rotational rate.

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Section: Introductionmentioning

confidence: 99%

Models of rotary vacuum drum and disc filters for flocculated suspensions

2011

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“…Models for the prediction of the performance of rotary vacuum filters have developed using incompressible descriptions of material behavior 1–5. Although they do include the analysis of important issues such as membrane resistance, drum/disc partitioning and hydrostatic head, they have limited use for compressible materials such as flocculated suspensions.…”

Section: Introductionmentioning

confidence: 99%

Preparation, Modification, and Evaluation of Cruentaren A and Analogues

Bindl

Jean

Herrmann

et al. 2009

Chemistry A European J

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An expeditious total synthesis of the highly cytotoxic F-ATPase inhibitor cruentaren A (1) is described based on a ring-closing alkyne metathesis (RCAM) reaction for the formation of the macrocylic ring. Other key transformations comprise a C-acylation of the benzyl lithium reagent derived from orsellinic acid ester 9 with Weinreb amide 7, a CBS reduction of the resulting ketone 10, and a Soderquist propargylation of aldehyde 21 with allenylborane (S)-27 to set the C-15 chiral center of the required alcohol fragment 25. The RCAM precursor 33 was assembled by acylation of 25 with acid fluoride 32, since more conventional methods for ester bond formation were unproductive. Moreover, the choice of the protecting groups, in particular for the secondary alcohol at C-9, which is prone to engage in translactonization, turned out to be critical; a relatively stable TBDPS ether had to be chosen for this site, which was removed in the final step of the synthesis with aqueous HF since other fluoride sources met with failure. The successful synthetic route was then expanded beyond the natural product, bringing a series of analogues into reach that feature incremental but deep-seated structural modifications. Three of these fully synthetic compounds turned out to be as or even more cytotoxic than cruentaren A itself against L-929 mouse fibroblast cells, reaching IC(50) values as low as 0.7 ng mL(-1).

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