WO1994022567A1 - Traitement de melanges au moyen d'impulsions - Google Patents

Traitement de melanges au moyen d'impulsions Download PDF

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Publication number
WO1994022567A1
WO1994022567A1 PCT/GB1994/000641 GB9400641W WO9422567A1 WO 1994022567 A1 WO1994022567 A1 WO 1994022567A1 GB 9400641 W GB9400641 W GB 9400641W WO 9422567 A1 WO9422567 A1 WO 9422567A1
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WO
WIPO (PCT)
Prior art keywords
vessel
mixture
compartments
liquid
oscillations
Prior art date
Application number
PCT/GB1994/000641
Other languages
English (en)
Inventor
Malcolm Robert Mackley
Robert Lumley Skelton
Keith Buchanan Smith
Original Assignee
British Technology Group Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Technology Group Limited filed Critical British Technology Group Limited
Publication of WO1994022567A1 publication Critical patent/WO1994022567A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/65—Mixers with shaking, oscillating, or vibrating mechanisms the materials to be mixed being directly submitted to a pulsating movement, e.g. by means of an oscillating piston or air column

Definitions

  • This invention relates to the processing of mixtures of liquids and particulate solids.
  • processing we include for instance firstly mixing, especially where there may be a requirement to handle a broad range of particle size or density and a high volume fraction of solids loading.
  • processing in which a chemical reaction takes place between the constituents of the mixture, leading to a liquid, solid or gaseous product, especially where efficient heat/mass transfer Is particularly required.
  • dissolving or crystallising we include for instance firstly mixing, especially where there may be a requirement to handle a broad range of particle size or density and a high volume fraction of solids loading.
  • the mixture 1s processed 1n an elongated vessel arranged either vertically or steeply sloping. Secondly, that the vessel 1s divided into a succession of compartments separated by baffle means located at axial Intervals within the vessel. Thirdly, that the mixture 1s subjected to a pulsating motion which, in combination with the gravity forces Inherent 1n a vertical vessel, causes the mixture to reach a steady state 1n which a substantially uniform characteristic 1s achieved within each compartment but there is a predetermined relationship between the values of that characteristic as you proceed from each compartment to the next. Fourthly, that parameters are chosen so that chaotic liquid flows are promoted within the vessel.
  • D is the tube diameter
  • ⁇ 1s the angular frequency of oscillation
  • x 0 is the centre-to-peak amplitude of oscillation
  • ⁇ the kinematic viscosity
  • the invention is to be distinguished from processing methods involving both baffles and oscillations as described, for instance, in Patent GB-B-2187970, where the axis of the elongated processing vessel is essentially horizontal.
  • the invention is also to be distinguished from the many known so-called "fluidised bed” methods of achieving continuous-ion-exchange and other processes which require a continuous net recirculating or other flow of fluid through a process vessel, and also at least one bed structure - typically a succession of them - on which to support fractions of the particulate solid at those times during the process cycle when they are not 1n a fluidised state.
  • Patent Specification SU-A-899107 1n which a mixing vessel subject to pulsation 1s fitted with a series of axially-spaced baffles, but 1n which those baffles are shaped so as to Impose a deliberate component of rotary velocity (about the axis of the vessel) upon fluid which passes axlally through them, so imposing a partially- ordered flow Instead of a chaotic one.
  • Figures 2 and 3 are graphs.
  • Figure 1 shows an elongated vessel 1 fixed by a clamp 11 and arranged with its axis 2 vertical, with its top 3 open and its base closed by a plug 4 which is permeable to the liquid but not to the solid constituents of the mixture to be processed.
  • a liquid-tight bellows 5 connects the base of vessel 1 to a plate 6 which is reslliently suspended by springs 7 and carries a transducer 8 to produce an output indicative of the frequency and amplitude of the vertical oscillations imparted to the plate 6, and thus to the mixture within vessel 1, by an oscillator indicated at 9.
  • Ring-shaped baffles 10 mounted at vertical intervals from the inner wall of vessel 1, divide the vessel into a vertical succession of compartments 12-17.
  • baffles 10 The radial extent of the baffles 10 is such that although it is sufficient for them to exert a substantial mixing action of the contents of the vessel when they are pulsated by the vibrator 9, and for the baffles to define distinct compartments (12-17), in which stable liquid/solid regimes can exist when a steady state is reached. Nevertheless the central clearance defined by each baffle must be large enough for both the liquid and the solid particles to move freely between compartments whenever a steady state does not exist. Assuming vessel 1 1s transparent, measurement of solids concentration within any of the compartments 12-17 may be achieved by an optical densltometer (18) moveable up and down the outer wall of the vessel.
  • the apparatus may typically be used in 'batch' operation to achieve a useful steady-state condition of a single charge of mixture admitted at the start by pouring Into the open top 3, by use of Interchangeable inlet/outlet means (shown In outline in broken lines at 19 and 20) the liquid content (and, 1f desired, the solid content too) of the charge may 1f desired be changed continuously as operation proceeds.
  • Interchangeable inlet/outlet means shown In outline in broken lines at 19 and 20
  • the liquid content (and, 1f desired, the solid content too) of the charge may 1f desired be changed continuously as operation proceeds.
  • vessel 1 was 0.5m tall and of internal diameter 23mm, and the bellows 5 were of flexible stainless steel.
  • Baffles 10 had a radial width of 8mm, so leaving a central orifice of diameter 7mm, and were spaced 35mm apart axially.
  • the batch charge was a 1% w/w concentration of ion-exchange beads in water, the mean initial diameter of the beads being 0.5mm, and their density 1100 kg/m**.
  • Oscillator 9 was of electromagnetic type, and was not positively attached to the underside of plate 6, so that care had to be taken not to exceed "g"-force on the underside of the plate, and so risk loss of contact between Items 6 and 9.
  • Oscillator 9 was operated over a range of frequencies and - A - amplitudes. It was found that peak-to-peak amplitudes of less than 3mm were insufficient to levitate the solid beads, and that 6mm was the maximum amplitude achievable without exceeding "g"-force on the bellows, but that if there had been a positive connection between oscillator 9 and the underside of plate 6 a maximum complete stroke of the oscillator of up to 18mm might have been possible. Frequency was varied in the range 3 to 10 Hz.
  • the effect of the oscillations can also be influenced by structural features. For instance by making the baffles asymmetrical by giving them different configurations on their two axially-facing surfaces.
  • the capacity of the spaced baffles 10 to promote graduated and/or uniform mixing of solids and liquid within the compartmented region of the tube was also evident from another observation of the experiments using heavier-than-liquid particles.
  • much power was supplied to the oscillator 9, up to and above the level achieving uniform solids/liquid concentration within all compartments, above the level of the topmost baffle 10a mixing always deteriorated and concentration fell off.
  • Figure 2 is a graph illustrating, approxi ately, the typical range of operating conditions likely to result in chaotic flow (as already defined) in a fluid-filled baffled vessel in which the fluid is subject to oscillations.
  • the y-axis indicates the peak-to-peak amplitude of the oscillations, from zero at the origin to a maximum of say a few centimetres at A.
  • the x-axis represents the frequency of the vibrations, from zero at the origin to a maximum of say a few kHz at point B.
  • compartment n one of the series of compartments (referenced 12-17 In Figure 1) is referred to generally as compartment n, and the adjacent compartment as n+1 , then the ratio ⁇ of the concentration C between the adjacent cells may be defined as
  • the invention can also be effected using many other shapes of baffle, e.g. 1n particular multl-orificed baffles.
  • the edges of the orifices it is generally advantageous for the edges of the orifices to be sharp, and for the baffles to be arranged so that the orifice edges point in a direction that can be resolved Into a substantial component in a plane lying transverse to the length of the vessel.
  • Sufficient sharpness may be achieved 1n various ways, e.g. by forming the edge to an evident point or by forming the baffle from thin material.
  • the formula ⁇ c /r>l, and preferably > 10 may be applied where r is the radius of curvature at the edge and X Q is the maximum amplitude of the applied oscillations.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

L'invention concerne un procédé de traitement d'un mélange d'au moins un liquide et d'au moins un solide se présentant sous forme particulaire. Le mélange se trouve dans un récipient allongé vertical (1) divisé en compartiments par une série de chicanes à ouverture (10) situées à intervalles dans un sens axial, et dans lequel des impulsions réglables sont appliquées au mélange, et où la fréquence et l'amplitude des impulsions sont sélectionnées de façon à ce qu'un écoulement dit 'chaotique' soit produit à l'intérieur des compartiments, favorisant une répartition axiale statique de la concentration solide/liquide, à savoir une valeur sensiblement commune dans chaque compartiment et un rapport prédéterminé entre deux compartiments adjacents quels qu'ils soient. Le procédé peut se faire par étapes ou bien le liquide peut s'écouler continuellement dans le récipient. Les chicanes peuvent être généralement coaxiales au récipient et de forme annulaire, de sorte que la communication entre les compartiments adjacents se fasse par l'ouverture centrale de la chicane les séparant.
PCT/GB1994/000641 1993-03-29 1994-03-28 Traitement de melanges au moyen d'impulsions WO1994022567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939306472A GB9306472D0 (en) 1993-03-29 1993-03-29 Improvements in or relating to the processing of mixtures
GB9306472.3 1993-03-29

Publications (1)

Publication Number Publication Date
WO1994022567A1 true WO1994022567A1 (fr) 1994-10-13

Family

ID=10732922

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000641 WO1994022567A1 (fr) 1993-03-29 1994-03-28 Traitement de melanges au moyen d'impulsions

Country Status (2)

Country Link
GB (2) GB9306472D0 (fr)
WO (1) WO1994022567A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2749310A1 (fr) * 1996-06-03 1997-12-05 Atochem Elf Sa Procede pour produire des particules de latex polymere coagulees
WO2016168325A1 (fr) * 2015-04-13 2016-10-20 Virginia Tech Intellectual Properties, Inc. Appareil de déshydratation et de déminéralisation de particules de fines

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005009322A1 (de) * 2005-03-01 2006-09-14 Degussa Ag Durchmischungsreaktor
GB0523245D0 (en) * 2005-11-15 2005-12-21 Nitech Solutions Ltd Improved apparatus and method for applying oscillatory motion
GB0614810D0 (en) * 2006-07-25 2006-09-06 Nitech Solutions Ltd Improved apparatus and method for maintaining consistently mixed materials
US20160250615A1 (en) 2013-10-14 2016-09-01 Universidade Do Porto Apparatus for mixing based on oscillatory flow reactors provided with smooth periodic constrictions
US20190111402A1 (en) 2016-04-08 2019-04-18 Universidade Do Minho Modular oscillatory flow plate reactor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE632126A (fr) *
GB323534A (en) * 1928-10-04 1930-01-06 Vincent Gregory Walsh An improved method of and apparatus for making emulsions and mixtures applicable also for other purposes
US2090496A (en) * 1934-08-17 1937-08-17 Colloid Corp Apparatus for producing suspensions
US2847283A (en) * 1955-11-25 1958-08-12 Warren S Figg Pulsed mixer-settler solvent extraction contactors
GB935431A (en) * 1958-05-29 1963-08-28 Nat Res Dev Improvements in apparatus for the treatment of multi-phase systems
CH397719A (fr) * 1962-05-09 1965-08-31 Commissariat Energie Atomique Procédé de dispersion de gouttes uniformes d'un premier liquide dans un deuxième liquide
SU899107A1 (ru) * 1980-06-13 1982-01-23 Предприятие П/Я Р-6273 Смеситель
DE3208977A1 (de) * 1982-03-12 1983-09-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und vorrichtung zum mikrobiellen abbau organisch belasteter substrate
US4533255A (en) * 1982-07-01 1985-08-06 Eppendorf Geratebau Netheler & Hinz Gmbh Process for mixing liquid samples to be analyzed, as well as apparatus for performing this process
US5052813A (en) * 1988-11-08 1991-10-01 Brian Latto Tube type vortex ring mixers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000086A (en) * 1975-04-28 1976-12-28 Vish Minno-Geoloshki Institute - Nis Method of and apparatus for emulsification
FR2485941B1 (fr) * 1980-07-03 1988-07-29 Commissariat Energie Atomique Colonne pulsee annulaire
NL8602447A (nl) * 1986-09-27 1988-04-18 Stamicarbon Werkwijze voor een vloeistof-vast contact.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE632126A (fr) *
GB323534A (en) * 1928-10-04 1930-01-06 Vincent Gregory Walsh An improved method of and apparatus for making emulsions and mixtures applicable also for other purposes
US2090496A (en) * 1934-08-17 1937-08-17 Colloid Corp Apparatus for producing suspensions
US2847283A (en) * 1955-11-25 1958-08-12 Warren S Figg Pulsed mixer-settler solvent extraction contactors
GB935431A (en) * 1958-05-29 1963-08-28 Nat Res Dev Improvements in apparatus for the treatment of multi-phase systems
CH397719A (fr) * 1962-05-09 1965-08-31 Commissariat Energie Atomique Procédé de dispersion de gouttes uniformes d'un premier liquide dans un deuxième liquide
SU899107A1 (ru) * 1980-06-13 1982-01-23 Предприятие П/Я Р-6273 Смеситель
DE3208977A1 (de) * 1982-03-12 1983-09-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren und vorrichtung zum mikrobiellen abbau organisch belasteter substrate
US4533255A (en) * 1982-07-01 1985-08-06 Eppendorf Geratebau Netheler & Hinz Gmbh Process for mixing liquid samples to be analyzed, as well as apparatus for performing this process
US5052813A (en) * 1988-11-08 1991-10-01 Brian Latto Tube type vortex ring mixers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED Section Ch Week E461, 5 January 1983 Derwent World Patents Index; Class J02, AN 99420 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2749310A1 (fr) * 1996-06-03 1997-12-05 Atochem Elf Sa Procede pour produire des particules de latex polymere coagulees
WO1997046607A1 (fr) * 1996-06-03 1997-12-11 Elf Atochem S.A. Un procede pour produire des particules de latex polymere coagulees
US6114415A (en) * 1996-06-03 2000-09-05 Elf Atochem, S.A. Method for producing coagulated polymer latex particles
CN1076362C (zh) * 1996-06-03 2001-12-19 埃勒夫阿托化学有限公司 凝聚的聚合物乳胶粒子的制备方法
WO2016168325A1 (fr) * 2015-04-13 2016-10-20 Virginia Tech Intellectual Properties, Inc. Appareil de déshydratation et de déminéralisation de particules de fines
US10561964B2 (en) 2015-04-13 2020-02-18 Virginia Tech Intellectual Properties, Inc. Apparatus for dewatering and demineralization of fine particles
RU2736757C2 (ru) * 2015-04-13 2020-11-19 Вирджиния Тех Интеллекчуал Пропертис, Инк. Устройство для обезвоживания и деминерализации мелких частиц
US11752451B2 (en) 2015-04-13 2023-09-12 Virginia Tech Intellectual Properties, Inc. Method for dewatering and demineralization of fine particles

Also Published As

Publication number Publication date
GB2276559A (en) 1994-10-05
GB9306472D0 (en) 1993-05-19
GB9406107D0 (en) 1994-05-18

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