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3 ENERGY-EFFICIENT PROCESSES EP-WÜT for the poor thermal conductivity of the polymers (approx. 0.25 W/m2), the heat transfer wall is configured as a thin polymer film with a thickness be- tween 75 μm and 150 μm. The total heat transfer surface area in the unit can be enlarged if required. The plates have the dimensions 500 mm x 300 mm. A practically relevant application for the test system was defined by the pro- ject partner Merck KGaA. The main area of application proposed was the condensation of organic solvents, such as hexane, heptane, toluene or tet- rahydrofuran, which are common solvents used in industrial technical cen- tres. Additional operating parameters, such as mass flows and maximum temperatures were also specified and are shown in Table 5. Table 5: The operating conditions defined for the project Product volume flow rates 20 – 100 l/h Cooling water volume flow rates 0.5 – 2 m3/h Product temperatures ~ 100°C Cooling water temperature range ~ 100°C Additional requirements Positive pressure on cooling water side: approx. 4 bar Calorplast GmbH joined the project as a partner organisation with respon- sibility for designing and manufacturing the heat exchanger. With extensive experience in the construction of heat exchangers from polymeric mate- rials, Calorplast GmbH was able to contribute a high level of expertise to the project. The participation of Calorplast ensured that the results from the basic research work conducted at Kaiserslautern University of Technology could flow directly into the prototype development phase. The final demonstrator is shown in Figure 95. Pictured on the left is a heat exchanger with five intermediate plates, i.e. with a total of six chambers per fluid. The heat exchanger was always operated in cross-flow mode. The right hand panel in Figure 95 shows a close-up of the slots for the gaskets and also shows the studded structure that is used to hold the film in place. The fluid enters the exchanger via an arc-shaped fluid distributor and a curved chan- nel. The fluid then enters the milled flow ducts between the polymer film and the base or intermediate plates. 226PDF Image | Chemical Processes and Use of CO2
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