Dampfpermeation mit Polymermembran für die Entwässerung von Ethanol und anderen organischen Flüssigkeiten
A growing market of biogenous fuels and solvents requires efficient production processes. Within the production, the purification process consumes a higher rate of the overall process energy. Major advantages of the vapour permeation in a distillation hybrid process in comparison to competing processes are lower operating costs and steady state behaviour. Disadvantages of state-of-the-art organic membrane dewatering technology are sensibility, unreliability and insufficient purified product
... urified product quality. In this work, an organic membrane, based on polyvinyl alcohol has been improved. It is longterm stable to common organic solvents, temperatures up to 140 ◦C and 0.17 kg/kg mass fraction water in the feed. The improved membrane can be easily and cheaply produced in industrial scale. The membrane characterisation was done with bench- and pilot-scale vapour permeation facilities. Film condensation on the retentate side of the membrane, as a up-to-now undiscussed phenomena, was discovered during the experiments and validated by a simulation model. An envelope type membrane module has been developed in recent years with a high packing density and low retentate pressure drop. Due to a decreased degree of efficiency during the experiments, the crucial parameters were investigated. After identifying the permeate pressure drop as the potential major cause, the envelope type membrane and module was modified to improve the efficiency. The challenge for a technology transfer from research to industry is insufficient ex- perience in the industry. A software tool concept has been developed to support the engineers, designing membrane facilities with its basic design parameters. This basic engineering tool uses a free graphical user interface and a spreadsheet for initial designing and presenting the numerical results from a VBA macro.