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(of H2O, at the top of the column < 100 wt ppm) and MeOH recovery (CH3OH, at the bottom of the column < 100 wt ppb) [91]. A distillation process analysis, to be considered in the integrated CDU process, shows that a considerable amount of reboiler duty can be saved by a feed tray optimisation. By feeding the two- phase stream into stage 38, the required reboiler duty is reduced from 21.2 MW to about 15 MW. A rate-based calculation of the column is performed, using the mass and heat transfer model from Billet and Schultes implemented in CHEMCAD [111], for its sizing. Mellapack 250Y is used as packing in the column. The column is designed to operate at about 60 % of its flooding capacity which leads to a diameter of 4.4 m. The calculated height is 25 m of packing, to include the required amount of equilibrium stages. The top gas stream 29, coming from partial condenser 23, is compressed up to 1.2 bar to compensate the pressure drop incurred in the following heat exchanger 25. Here, MeOH is condensed at 35°C, and the remaining inert gases are purged. The heat released in the condenser (unit 23) is used to heat water for the ORC. Figure 2: Process flow diagram of the reference process for MeOH synthesis CO2 and H2 from electrolysis. Finally, liquid MeOH, stream 31, leaves the process as the product. Purge streams 35, 36 and 38 are collected and combusted in furnace 28 with stream 40, air at 1 200 °C. Off-gases are used to produce steam in boiler 30, which can be sold as by-product or used in the upstream carbon capture unit. In [91], this heat is used in the ORC. 3.4.2 Integrated CDU process The integrated CDU process proposes a different heat integration than the one performed in Van- Dal and Bouallou [91], by producing a certain amount of electricity which is directly consumed in the process. Figure 3 depicts the hot and the cold composite curves. In the reference process [91], the heat generated and not integrated along the process is used to generate electricity in the ORC. The low temperature level (down to 80 °C) in the ORC may cause inefficiencies, while producing 2.2 MW of electricity. The electricity generated in the integrated CDU process is increased by using four ad 34PDF Image | evaluation of CO2 utilisation for fuel production
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