Abstract. Microchannel reactors made of packed wafer stacks were used for selective hydrogenation of benzene to cyclohexene as well as for partial oxidation of I-butene to maleic anhydride and ethene to ethene oxide. The micro structured wafers were catalytically activated by anodic oxidation of aluminum wafers followed by an impregnation process with ruthenium for benzene hydrogenation and V 20sffi02 for I-butene oxidation or by physical vapor deposition of silver for ethene epoxidation.
Only a few microreaction manufacturing plants are being operated to date. The performance of two different microreaction manufacturing plants is discussed, one in a dedicated application, the other in a multi-purpose environment. Strategies to address the major design and operating challenges for microreactor manufacturing plants to equipartition starting material streams into parallel reaction chambers throughout manufacturing operation are provided for demanding liquid/liquid-reactions. The importance of minimizing the pressure drop variances between different microreactors or channels by rigorous microreactor fabrication process control is described. A cost/performance balanced microreactor manufacturing strategy is suggested, and the ease of assessing trade-off decisions is addressed for different manufacturing systems by the use of a case study involving a diffusion controlled Grignard reaction.
This paper describes the development of an efficient reclaiming system for post combustion carbon capture technology. Impurities are emerging from the combustion of common fossil fuels (oil, coal or natural gas) such as SOx and NOx. They react with the CO 2 capture solvent by forming complexes, which will accumulate in the aqueous solvent solution and reduce its performance. Consequently they must be removed through a reclaiming system. In contrast to conventional thermal based reclaiming systems the reclaiming system described in this paper features a selective process based on crystallization to maximize solvent recycling and minimize residue disposal, hence minimizing operating costs. On the one hand it converts part of the component formed by SOx-absorption into a commercially reusable product (whilst simultaneously unblocking and recovering the solvent) and on the other hand it removes the formed heat stable salts and other impurities from the liquid solvent with a high efficiency. Experience has been gathered from pilot operation and the process has been validated and optimized. With this, a continuous full-scale design has been developed.
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