Evaporator agitated thin-film

Economic and process considerations usually dictate that agitated thin-film evaporators be operated in single-effect mode. Veiy high temperature differences can then be used many are heated with Dowtherm or other high-temperature media. This permits achieving reasonable capacities in spite of the relatively low heat-transfer coefficients and the small surface that can be provided in a single tube [to about 20 m" (200 ft")]. The structural need for wall thicknesses of 6 to 13 mm (V4 to V2. in) is a major reason for the relatively low heat-transfer coefficients when evaporating water-like materials. 

Parker, N. Agitated Thin-Film Evaporators-Equipment and Economics, Chemical Engineering, Sept. 13, 1965, p. 179. 

MUTZENBURG, A. B. Chem Eng., Albany 72, No. 19 (13 Sept. 1965) 175 - 8. Agitated thin film evaporators. Part I. Thin film technology. 

In agitated thin-film evaporators, a thin layer of solution is spread on the heating surface by mechanical means. Wiped-film evaporators are used for very viscous materials and for producing solid products (see Figure 10.34). The design and applications of this type of evaporator are discussed by Mutzenburg (1965), Parker (1965), and Fischer (1965). 

Figure 14. Mechanically agitated thin-film evaporator, vertical design with cylindrical thermal zone. (Luwa Corporation.)...

Mechanically agitated thin-film evaporators are used for four general types of applications ... 

Freese, H. L., Mechanically Agitated Thin-Film Evaporators, from the short com Evaporation Technology, p. D-2, The Center for Professional Advancement, East Brunswick, New Jersey (May 2-24, 1978)... 

Fischer, R., Agitated Thin-Film Evaporators Part 3— Process Applications, Chem Eng., p. 186 (Sept. 13,1965)... 

The second stage of the hybrid-process is essentially a crystallization capable of crystallizing all solids dissolved in the feed resp. the brine of the RO stage. Parts of these substances tend to heavy scaling and, therefore, the choice of the crystallization equipment is limited. A proven solution is, of course, the agitated thin film evaporator. However, this type of equipment must lead to high specific treatment costs for two reasons ... 

An agitated thin-film evaporator is costly and limited in size. 

Because of its high capital cost, it is in general out of the question to combine agitated thin film evaporators to an energy saving multiple effect evaporation process. 

ATF Agitated Thin Film Evaporator VTE Vertical Tube Evaporator MSF Multi Stage Flash... 

Mutzenburg, A.B. Agitated Thin Film Evaporators—Thin Film Technology, Chemical Engine ering, Sept. 13,1965, p. 175. 

Agitated thin-film evaporators (ATFEs) consist of a single cylindrical heating surface jacketed by steam or hot oil. The solvent-rich feed is spread over the... 

Mg. 7.1-7 Agitated thin-film evaporator equipped with a rotor with fixed blades... 

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