Reactive mixing applications

Understanding the interplay of the three mechanisms—reaction, diffusion, and convection—is essential. In light of what happens in 2D reactive chaotic flows, we can attempt to extend the analysis to 3D reactive mixing applications. Let us take a fresh look at a common 3D example, a mixing tank stirred with three... 

Szalai, E. S., J. Kukura, P. Arratia, and F. J. Muzzio (2002). The effect of hydrodynamics on reactive mixing applications, submitted for publication in AIChE J. 

The reactive processing at polyurethane - unsaturated polyester mixtures, which is of special interest this problem has also been investigated.288 Making compounds of these polymers after polymerization is impossible because neither can be melted or disolved. However, the reactive processing technique makes it possible to prepare materials based on these polymers by injecting of the components of the reactive mix into a mixing chamber. This approach allows us to obtain materials with new performance characteristics and enlarged areas of applications. 

Another application of the injection system consists of recycling old and waste rubber. The reactive mixing of crumb rubber with a melted polymer represents an innovative way of recycling these waste rubbers [6]. Some thermoplastic elastomer may contain up to 60% recycled rubber derived from used vehicle tires, and thus through the reactive injection system the rubber scrap is revulcanized [7]. 

Gas-expanded liquids (GXLs) are emerging solvents for environmentally benign reactive separation (Eckert et al., op. cit.). GXLs, obtained by mixing supercritical CO2 with normal liquids, show intermediate properties between normal liquids and SCFs both in solvation power and in transport properties and these properties are highly tunable by simple pressure variations. Applications include chemical reactions with improved transport, catalyst recycling, and product separation. 

Miller CW, Benson LV (1983) Simulation of solute transport in a chemically reactive heterogeneous system model development and application. Water Resourc Res 19 381-391 Moise X, Starinsky A, Katz A, Kolodny Y (2000) Ra isotopes and Rn in brines and ground waters of the Jordan-Dead Sea Rift Valley enrichment, retardation, and mixing. Geochim Cosmochim Acta 64 2371-2388... 

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