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Chemical Processes and Use of CO2

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Chemical Processes and Use of CO2 ( chemical-processes-and-use-co2 )

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1CO2 UTILIZATION DMEEXCO2 Fig. 25: Continuous improvement in catalyst stability (Generations A, B and C) built at the Fraunhofer Institute for Environmental, Safety and Energy Tech- nology (UMSICHT), which began operating during the second half of the project. The benchmarking study showed that a fixed-bed reactor is likely to be superior to a slurry reactor. 1.8.3 Results The work carried out at hte and BASF yielded a catalyst system that for the first time is capable of achieving the minimum service life of one year required of catalysts used in industrial applications (Fig. 24). The catalyst system can also be fabricated in the quantities needed in industrial applications As part of their work on process development and integration, TUM and Linde conducted an evaluation of the overall process from which they deri- ved catalyst development targets. An important component of the evaluati- on was using detailed simulation studies to benchmark the single-step pro- cess against the conventional two-step DME synthesis. A new concept was introduced for the direct DME synthesis that involved material and energy integration of the syngas production and the DME synthesis stages. A new separation sequence for purifying the DME product was also developed. Fol- lowing further optimisation of the process, the final concept of direct DME synthesis that had been developed over the course of the project resulted in a significant increase in process efficiency and a reduction in carbon emis- sions of more than 30%. Using both integral and differential reactors multi- ple series of experiments were carried out to characterise the kinetics of the new catalyst system. The experimental data provides the basis for a kinetic 72

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