Static Mixers in the Process Industries—A Review

This paper summarizes the field of static mixers including recent improvements and applications to industrial processes. The most commonly used static mixers are described and compared. Their respective advantages and limitations are emphasized. Efficiencies of static mixers are compared based both on theory and experimental results from the literature. The operations, which can benefit from the use of static mixers, are explored, namely, mixing of miscible fluids, liquid–liquid and gas–liquid interface generation, liquid–solid dispersion and heat transfer. Design parameters governing the performance of the various mixers in these applications are reported. The key parameters needed for the selection of a suitable mixer are highlighted.

[1]  Albert Renken,et al.  Solution polymerization of methyl methacrylate at high conversion in a recycle tubular reactor , 1992 .

[2]  Philippe A. Tanguy,et al.  A Comparative Assessment of the Performance of the Kenics and SMX Static Mixers , 2000 .

[3]  T. Blickle,et al.  SIMULATION OF MIXING DURING NON-STEADY STATE PARTICLE FLOW IN STATIC MIXERTUBES , 1992 .

[4]  Howard A. Stone,et al.  Dynamics of Drop Deformation and Breakup in Viscous Fluids , 1994 .

[5]  Arthur E. Bergles,et al.  Heat Transfer Enhancement—The Maturing of Second-Generation Heat Transfer Technology , 1997 .

[6]  C. J. Hoogendoorn,et al.  Heat transfer coefficients for viscous fluids in a static mixer , 1978 .

[7]  M. A. Hanna,et al.  Glycol glucosides process synthesis by reactive extrusion with a static mixer as postextruder reactor , 1996 .

[8]  J. R. Baker.  Motionless mixers stir up new uses , 1991 .

[9]  Jennifer Armstrong,et al.  Treatment of chlorinated ethenes in groundwater with ozone and hydrogen peroxide , 1996 .

[10]  D. Chisholm.  A theoretical basis for the Lockhart-Martinelli correlation for two-phase flow , 1967 .

[11]  Maria Gavrilescu,et al.  Hydrodynamics in external-loop airlift bioreactors with static mixers , 1997 .

[12]  Rudolf Eggers,et al.  Extraction of spray particles with supercritical fluids in a two‐phase flow , 1996 .

[13]  E. B. Nauman,et al.  Residence time distributions of power law fluids in motionless mixers , 1985 .

[14]  Albert Renken,et al.  BULK POLYMERIZATION OF STYRENE IN A STATIC MIXER , 1983 .

[15]  S. Taha,et al.  The effect of a static mixer on the ultrafiltration of a two-phase flow , 2000 .

[16]  B H Junker,et al.  Cultivation of attenuated hepatitis A virus antigen in a titanium static mixer reactor , 1994, Biotechnology and bioengineering.

[17]  Howard A. Stone,et al.  Relaxation and breakup of an initially extended drop in an otherwise quiescent fluid , 1989, Journal of Fluid Mechanics.

[18]  Richard V. Calabrese,et al.  Dispersion of viscous liquids by turbulent flow in a static mixer , 1988 .

[19]  J. M. Rallison.  The Deformation of Small Viscous Drops and Bubbles in Shear Flows , 1984 .

[20]  Lionel Choplin,et al.  Pressure Drop of Newtonian and Non-Newtonian Fluids Across a Sulzer SMX Static Mixer , 1997 .

[21]  L. T. Fan,et al.  Surface renewal model of condensation heat transfer in tubes with in-line static mixers , 1978 .

[22]  Paul A. Haas.  Turbulent dispersion of aqueous drops in organic liquids , 1987 .

[23]  Hans E. Kimmel,et al.  AIChE Spring National Meeting , 2004 .

[24]  F. Muzzio,et al.  Reynolds number effects on laminar mixing in the Kenics static mixer , 1998 .

[25]  G. Casamatta,et al.  Kinetic of a liquid/liquid/solid fine chemicals reactions – modelling of a continuous pilot plant reactor , 1996 .

[26]  E. Bruce Nauman,et al.  RESIDENCE TIME DISTRIBUTIONS AND MICROMIXING , 1981 .

[27]  Antonie A. C. M. Beenackers,et al.  Heat transfer and the continuous production of hydroxypropyl starch in a static mixer reactor , 1994 .

[28]  Julio M. Ottino,et al.  Deformation and breakup of slender drops in linear flows , 1986, Journal of Fluid Mechanics.

[29]  P. Whalley,et al.  A Simple Two-Phase Frictional Pressure Drop Calculation Method , 1982 .

[30]  Paul Kolodziej,et al.  The influence of impingement mixing on striation thickness distribution and properties in fast polyurethane polymerization , 1982 .

[31]  D. D. Kale,et al.  Pressure drop for two-phase air-non-newtonian liquid flow in static mixers , 1995 .

[32]  S. Middleman,et al.  Drop Size Distributions Produced by Turbulent Pipe Flow of Immiscible Fluids through a Static Mixer , 1974 .

[33]  M. F. Edwards,et al.  Mixing in the process industries , 1985 .

[34]  E. Bruce Nauman,et al.  The Kenics static mixer : new data and proposed correlations , 1995 .

[35]  Maria Gavrilescu,et al.  Mixing times in an external‐loop airlift bioreactor with static mixers , 1996 .

[36]  John R. Bourne,et al.  Micromixing in static mixers: an experimental study , 1992 .

[37]  Antonello Barresi,et al.  Wet mixing of fine ceramic powders in a motionless device , 1997 .

[38]  Jose C. Merchuk,et al.  Experimental Study of Dispersion and Separation of Phases in Liquid-Liquid Extraction of Copper by LIX 64N in Various Types of Mixers , 1980 .

[39]  H. A. Barnes,et al.  Chapter 8 – High concentration suspensions: preparation and properties , 1993 .

[40]  Pierre Godard,et al.  Melt viscosity of calcium-carbonate-filled low density polyethylene : Influence of matrix-filler and particle-particle interactions , 1996 .

[41]  Pierre J. Carreau,et al.  Influence of elastic properties on drop deformation and breakup in shear flow , 1998 .

[42]  Philippe A. Tanguy,et al.  Numerical simulations of mixing in an SMRX static mixer , 1996 .

[43]  S. Holdsworth,et al.  Rheological models used for the prediction of the flow properties of food products: a literature review , 1993 .

[44]  Liang-Shih Fan,et al.  Bubble flow characteristics in bubble columns at elevated pressure and temperature , 1998 .

[45]  P. Pustelnik,et al.  Residence time distribution of a power-law fluid in Kenics static mixers , 1988 .

[46]  D C Peters,et al.  Chapter 14 – Dynamics of emulsification , 1992 .

[47]  António A. Vicente,et al.  Increase of ethanol productivity in an airlift reactor with a modified draught tube , 1999 .

[48]  P. Ayazi Shamlou,et al.  Processing of Solid–Liquid Suspensions , 1993 .

[49]  Th.N. Zwietering,et al.  H2. The characteristics of a homogenized reactor for the polymerization of ethylene , 1961 .

[50]  Lucian M. Rusnac,et al.  Continuous hydrogenation of vegetable oils in reactors equipped with static mixers , 1992 .

[51]  Ica Manas-Zloczower,et al.  Observation of carbon black agglomerate dispersion in simple shear flows , 1990 .

[52]  D. D. Kale,et al.  Two-phase, gas-liquid flows in static mixers , 1992 .

[53]  Pierre J. Carreau,et al.  Influence of elastic properties on drop deformation in elongational flow , 1997 .

[54]  Marcel Crochet,et al.  Finite-element simulation of mixing .2. Three-dimensional flow through a kenics mixer , 1997 .

[55]  Ottino,et al.  Self-similar drop-size distributions produced by breakup in chaotic flows. , 1991, Physical review letters.

[56]  Nathalie Martin,et al.  Use Of Static Mixer For Oxidation And Disinfection By Ozone , 1994 .

[57]  Albert Renken,et al.  Motionless mixers for the design of multitubular polymerization reactors , 1984 .

[58]  Piotr Pustelnik.  Investigation of residence time distribution in Kenics static mixers , 1986 .

[59]  D. D. Kale,et al.  Pressure drop for laminar flow of non-Newtonian fluids in static mixers , 1991 .

[60]  Philippe A. Tanguy,et al.  Solid liquid mixing at high concentration with SMX static mixers , 2000 .

[61]  Geoffrey Ingram Taylor,et al.  The Viscosity of a Fluid Containing Small Drops of Another Fluid , 1932 .

[62]  J. Le Paulouë,et al.  State-of-the-Art of Ozonation in France , 1999 .

[63]  Albert Renken,et al.  Development of a continuously operated reactor for the limited hydrolysis of whey protein by trypsin , 1998 .

[64]  Antonie A. C. M. Beenackers,et al.  Three-dimensional numerical simulation of flow and heat transfer in the Sulzer SMX static mixer , 1999 .

[65]  Shigeo Goto,et al.  The effect of static mixer on mass transfer in draft tube bubble column and in external loop column , 1992 .

[66]  Krishna D.P. Nigam,et al.  Residence time distribution in static mixer , 1980 .

[67]  N. N. Rulyov,et al.  Application of ultra-flocculation and turbulent micro-flotation to the removal of fine contaminants from water , 1999 .

[68]  Tooru Ishikawa,et al.  Limits of Reynolds Number for Effective Use of Heat Transfer Promoters. Twisted tape and static mixer. , 1994 .

[69]  J. Bourne,et al.  Micromixing and fast chemical reactions in static mixers , 1991 .

[70]  Heh Han Meijer,et al.  Droplet breakup mechanisms : stepwise equilibrium versus transient dispersion , 1993 .

[71]  Albert Renken,et al.  EFFECT OF STATIC MIXERS ON EXPANSION AND AXIAL DISPERSION OF LIQUID IN FLUIDIZED BEDS AT LOW REYNOLDS NUMBER , 1991 .

[72]  Michael M. Meagher,et al.  Liquefaction of starch by a single-screw extruder and post-extrusion static-mixer reactor☆ , 1995 .

[73]  A. M. Al Taweel,et al.  A novel static mixer for the effective dispersion of immiscible liquids , 1996 .

[74]  Boleslaw Jurkowski,et al.  New aspects of polyamide 6 mixing in molten state with low-density polyethylene , 1997 .

[75]  Ica Manas-Zloczower,et al.  Dispersion of titanium dioxide agglomerates in viscous media , 1993 .

[76]  P. J. Carmelo,et al.  Fractionation of Lipids in a Static Mixer and Packed Column Using Supercritical Carbon Dioxide , 2000 .

[77]  R. Saxton,et al.  Mixing in Laminar-Flow Systems , 1957 .

[78]  L. T. Fan,et al.  Mass transfer in bubble columns packed with motionless mixers , 1978 .

[79]  William Reginald Dermott Manning,et al.  High pressure engineering , 1976 .

[80]  H. Pfost,et al.  Measurement of the mixing quality in premix combustors , 1998 .

[81]  Gabriel Wild,et al.  Study of hydrodynamic behaviour in bubble columns and external loop airlift reactors through analysis of pressure fluctuations , 2000 .

[82]  Antonie A. C. M. Beenackers,et al.  Oxidative absorption of hydrogen sulfide by a solution of ferric nitrilotriacetic acid complex in a cocurrent down flow column packed with SMV-4 static mixers , 1994 .

[83]  T. O. Craig.  Heat transfer during polymerization in motionless mixers , 1987 .

[84]  Shigeo Goto,et al.  Mass Transfer in Bubble Slurry Column with Static Mixer in Draft Tube , 1991 .

[85]  Kiichiro Matsumura,et al.  Some performance data of the Hi‐mixer — an in‐line mixer , 1981 .

[86]  A R McFarland,et al.  Suitability of air sampling locations downstream of bends and static mixing elements. , 1999, Health physics.

[87]  C. Hamrin,et al.  Conversion and temperature profiles for complex reactions in laminar and plug flow , 1970 .

[88]  von Zdeněk Lecjaks,et al.  Druckverlust bei der strömung einer flüssigkeit durch ein rohr mit schraubeneinbauten , 1984 .

[89]  W. R. Schowalter,et al.  Flocculation of colloids suspended in a viscoelastic fluid undergoing shear , 1988 .

[90]  Jose C. Merchuk,et al.  Characteristics of a motionless mixer for dispersion of immiscible fluids. I: A modified electroresistivity probe technique , 1986 .

[91]  Fernando J. Muzzio,et al.  Numerical characterization of low Reynolds number flow in the Kenics static mixer , 1998 .

[92]  Norman N. Li,et al.  Chemical Reactor Design, Optimization, And Scaleup , 1987 .

[93]  Lionel Choplin,et al.  Hydrodynamics and heat transfer of rheologically complex fluids in a Sulzer SMX static mixer , 1996 .

[94]  Yusuf Chisti,et al.  Mass transfer in external-loop airlift bioreactors using static mixers , 1990 .

[95]  Patrick Patrick Anderson,et al.  Analyzing Mixing in Periodic Flows by Distribution Matrices: Mapping Method , 2001 .

[96]  U. Böhm,et al.  Fluid-dynamic and mass-transfer behavior of static mixers and regular packings , 1999 .

[97]  Gerrit W. M. Peters,et al.  The Mapping Method for Mixing Optimization Part I: The Multiflux Static Mixer , 2001 .

[98]  Jose C. Merchuk,et al.  Characteristics of a motionless mixer for dispersion of immiscible fluids-II. Phase inversion of liquid-liquid systems , 1986 .

[99]  H. Stone,et al.  Satellite and subsatellite formation in capillary breakup , 1992, Journal of Fluid Mechanics.

[100]  Krishna D.P. Nigam,et al.  Coiled configuration for flow inversion and its effect on residence time distribution , 1984 .

[101]  M. Bohnet,et al.  Influence of solids concentration and static mixers on fluid dynamics in three-phase fluidized bed bioreactors , 1993 .

[102]  Philippe A. Tanguy,et al.  Numerical investigation of the performance of several static mixers , 1998 .

[103]  A. Bakker,et al.  Avoid agitation by selecting static mixers , 1997 .

[104]  Gabriel Wild,et al.  A review of recent chemical techniques for the determination of the volumetric mass-transfer coefficient KLa in gas-liquid reactors , 1994 .

[105]  Jin-Young Choi,et al.  In-line mixer for feedforward control and adaptive feedback control of pH processes , 2000 .

[106]  Aniruddha B. Pandit,et al.  PRESSURE DROP IN FIXED, EXPANDED AND FLUIDIZED BEDS, PACKED COLUMNS AND STATIC MIXERS - A UNIFIED APPROACH , 1998 .

[107]  Howard A. Stone,et al.  The influence of initial deformation on drop breakup in subcritical time-dependent flows at low Reynolds numbers , 1989, Journal of Fluid Mechanics.

[108]  Julio M. Ottino,et al.  Stretching and breakup of droplets in chaotic flows , 1991, Journal of Fluid Mechanics.

[109]  E. B. Nauman,et al.  On residence time and trajectory calculations in motionless mixers , 1991 .

[110]  E. B. Nauman,et al.  FULLY DEVELOPED FLOW IN TWISTED TAPES: A MODEL FOR MOTIONLESS MIXERS , 1987 .

[111]  Julio M. Ottino,et al.  Breakup of liquid threads in linear flows , 1987 .

[112]  Kyu Yong Choi,et al.  Polymerization of styrene in a continuous filled tubular reactor , 1996 .

[113]  N. Nacevski,et al.  Extraction of Indium From Sulphate Solutions with D2EHPA Solutions Using Static Mixers , 1995 .

[114]  Ica Manas-Zloczower,et al.  Studies of Mixing Efficiency in Batch and Continuous Mixers , 1994 .

[115]  N. I. Heywood,et al.  MIXING EFFICIENCIES AND ENERGY REQUIREMENTS OF VARIOUS MOTIONLESS MIXER DESIGNS FOR LAMINAR MIXING APPLICATIONS , 1984 .

[116]  Geoffrey Ingram Taylor,et al.  The formation of emulsions in definable fields of flow , 1934 .

[117]  Peter Harriott,et al.  Unit Operations of Chemical Engineering , 2004 .

[118]  L. T. Fan,et al.  Augmentation of Forced Flow Boiling Heat Transfer with Kenics Montionless Mixers , 1980 .

[119]  M. Wagner,et al.  Turbulent mixing at high dilution ratio in a Sulzer-Koch static mixer , 1986 .

[120]  Piet D. Iedema,et al.  The Influence of Mixing on Molecular Weight Distribution During Controlled Polymer Degradation in a Static Mixer Reactor , 2001 .

[121]  E. B. Nauman,et al.  Enhancement of heat transfer and thermal homogenity with motionless mixers , 1979 .

[122]  E. B. Nauman,et al.  Contact time distributions in a large fluidized bed , 1991 .

[123]  L. D. Walker,et al.  Liquid dispersion in static in‐line mixers , 1983 .

[124]  Julio M. Ottino,et al.  A case study of chaotic mixing in deterministic flows: The partitioned-pipe mixer , 1987 .

[125]  J. Cavard,et al.  Comparative Assessment of Bromate Control Options , 2000 .

[126]  P. Drtina,et al.  Numerical simulation of the fluid flow and the mixing process in a static mixer , 1995 .

[127]  Jerzy Bałdyga,et al.  Interaction between chemical reactions and mixing on various scales , 1997 .

[128]  Albert Renken,et al.  Development of an enzyme fluidized bed reactor equipped with static mixers: application to lactose hydrolysis in whey , 1984 .

[129]  Ahmad Shariat,et al.  Performance of Structured Packing in a Commercial-Scale Column at Pressures of 0.02−27.6 bar , 1999 .

[130]  Maria Gavrilescu,et al.  Cultivation of a filamentous mould in an airlift bioreactor , 1995 .

[131]  Fernando J. Muzzio,et al.  Effects of injection location, flow ratio and geometry on kenics mixer performance , 1997 .

[132]  Philippe A. Tanguy,et al.  3D finite element simulation of fluid flow through a SMX static mixer , 1998 .

[133]  D. D. Kale,et al.  Pressure drop for laminar flow of viscoeleastic fluids in static mixers , 1992 .

[134]  E. B. Nauman,et al.  Static Mixers to Promote Axial Mixing , 2002 .

[135]  Zhu Qingshi,et al.  Ozone disinfection of sewage in a static mixer contacting reactor system on a plant scale , 1991 .

[136]  F. J. Zuiderweg,et al.  Sulzer static mixers as a packing in liquid/liquid extraction , 1984 .

[137]  R. Lockhart.  Proposed Correlation of Data for Isothermal Two-Phase, Two-Component Flow in Pipes , 1949 .

[138]  H. N. Stein,et al.  Shear thickening (dilatancy) in concentrated dispersions , 1990 .

[139]  Mark L. Sawley,et al.  Optimization of a Kenics static mixer for non-creeping flow conditions , 1999 .

[140]  M. Reeder.  SOME COMMON APPLICATIONS THAT BENEFIT FROM STATIC MIXERS : EQUIPMENT USEFUL IN A VARIETY OF CONTINUOUS PROCESSES , 1998 .

[141]  Arne Pietsch,et al.  The mixer–settler principle as a separation unit in supercritical fluid processes , 1999 .

[142]  L. Fan,et al.  Models for flow systems and chemical reactors , 1975 .

[143]  吕效平,et al.  Transfer Characteristics in Mechanically Stirred Airlift Loop Reactors with or without Static Mixers , 2000 .

[144]  Seung-Man Yang,et al.  Microstructure and rheological behaviour of electrosterically stabilized silica particle suspensions , 2001 .

[145]  Marcus Petermann,et al.  Manufacture of Powder Coatings by Spraying of Gas-Enriched Melts , 2001 .

[146]  Ica Manas-Zloczower,et al.  Comparison of stability and dispersion characteristics of organic pigment agglomerates , 1997 .

[147]  Shaffiq A. Jaffer,et al.  Quantification of laminar mixing in the kenics static mixer: An experimental study , 1998 .

[148]  E. Nauman.  Chemical Reactor Design , 1987 .

[149]  C. K. Lee,et al.  Predicting fluid‐bed reactor efficiency using adsorbing gas tracers , 1987 .

[150]  H. P. Grace.  DISPERSION PHENOMENA IN HIGH VISCOSITY IMMISCIBLE FLUID SYSTEMS AND APPLICATION OF STATIC MIXERS AS DISPERSION DEVICES IN SUCH SYSTEMS , 1982 .

[151]  E. B. Nauman,et al.  Reactions and residence time distributions in motionless mixers , 1982 .

[152]  Albert Renken,et al.  Engineering aspects of fluidized bed reactor operation applied to lactase treatment of whole whey , 1985 .

[153]  Z. Bao,et al.  Estimation of void fraction and pressure drop for two-phase flow in fine passages , 1994 .

[154]  Liang T. Fan,et al.  Mass-transfer coefficient and pressure-drop data of two-phase oxygen-water flow in bubble column packed with static mixers , 1975 .

[155]  F. Muzzio,et al.  The Kenics Static Mixer : a Three-dimensional Chaotic Flow , 1997 .

[156]  R. Mahalingam,et al.  Leach studies on hazardous waste monoliths from continuous solidification/stabilization processing , 1992 .

[157]  L. T. Fan,et al.  Stochastic modeling of segregation in a motionless mixer , 1977 .

[158]  G. Akay,et al.  Flow-induced phase inversion in the intensive processing of concentrated emulsions , 1998 .

[159]  Y. Maa,et al.  Effect of primary emulsions on microsphere size and protein-loading in the double emulsion process. , 1997, Journal of microencapsulation.

[160]  J. H. Jean,et al.  Continuous production of narrow-sized and unagglomerated TiO2 powders , 1987 .

[161]  Ji Ir,et al.  PRESSURE DROP AND HOMOGENIZATION EFFICIENCY OF A MOTIONLESS MIXER , 1982 .