Sulzer static mixer

Other motionless designs, such as the Sulzer static mixer (Fig. 18-62), accomplish mixing by making multiple divisions at each element transition. The flowing material follows a wavy path to stretch and distort the striations. The number of divisions and distorted paths causes more rapid mixing, but at the expense of a greater pressure drop per unit length of the mixer. 

Figure 2 - Schematic of the co-current, downflow trickle bed packed with carbon coated Sulzer Static Mixer Packing T = thermocouple location, P = pressure tap...

Hirech et al. have described preparation of polyurea microcapsules containing hquid pesticide (e.g., diazinon) suspended in concentrated disinfectant solution, by use of a two-step microencapsulation process [28], The first step is the hquid-hquid dispersion in a Sulzer static mixer (SMX) the second step is microencapsulation by inter-fadal polymerization in a stirred-tank reactor (Fig. 5.4). It has been shown that the... 

Static mixing of gas—Hquid systems can provide good interphase contacting for mass transfer and heat transfer. Specific interfacial area for the SMV (Koch/Sulzer) mixer is related to gas velocity and gas holdup ( ) by the following ... 

Heat transfer in static mixers is intensified by turbulence causing inserts. For the Kenics mixer, the heat-transfer coefficient b is two to three times greater, whereas for Sulzer mixers it is five times greater, and for polymer appHcations it is 15 times greater than the coefficient for low viscosity flow in an open pipe. The heat-transfer coefficient is expressed in the form of Nusselt number Nu = hD /k as a function of system properties and flow conditions. 

Figure 7.29 shows a Sulzer type SMX static mixer where the mixing element consists of a lattice of intermeshing and interconnecting bars contained in a pipe 80 mm diameter. It is recommended for viscous materials in laminar flow. The mixer shown is used in food processing, for example mixing fresh cheese with whipped cream. 

Figure 4.74 Radical polymerization of acrylates in a iaboratory-scaie experimentai set-up with a Sulzer-type pre-mixer. Fouling at the feeding point of the static mixer (top) and molecular weight distribution (bottom) [125],...

SDS [Sulzer Dainippon Sumitomo] A continuous process for polymerizing styrene. The reactants are mixed in a static mixer, which gives a very uniform time/temperature history for the polymer. Developed jointly by Sulzer, Dainippon Ink Chemicals, and Sumotomo Heavy Industries. Offered for license in 1990. 

Figure 9 Static mixer reactor developed by Sulzer. (Courtesy Sulzer Chemtech.)...

Li et al. [36] performed an extensive study on AP in a Sulzer SMX static mixer with both Newtonian and non-Newtonian fluids. They showed that AP increased by a factor of 23 in a SMX static mixer in the laminar flow regime. Figure 7-24 shows their correlation between the Fanning friction factor and the Reynolds number for experimental points under various operating conditions. 

Figure 7-24. Friction factor versus Reynolds number in Sulzer SMX Static Mixer. (Source Li et al., Trans. IChemE, Vol. 75, Part A, pp. 792-798, 1997. Reproduced with permission of the Trans. IChemE.)...

For instance, with the Hi-Mixer (161), 6Q/6 = 4n. A factor of 5 is easy to obtain for m with respect to an empty tube, at the expense of a corresponding increase in pressure-drop. A comparison between the existing types of static mixers (162) shows that most of them have an equivalent effectiveness. The case of Sulzer-Mixers has been especially studied (163), including use with gases (164). 

FIGURE 4 Static mixer left, open cross-flow structure right, structured packed bed of catalyst particles used in catalytic distillation (Sulzer Katapak S). 

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