Thermodynamic limitations of synthetic fuel production using carbon dioxide: A cleaner methanol-to-gasoline process

Szczygiel, Jerzy ✉; Kulazynski, Marek

English Scientific Article (Journal Article)
Published: JOURNAL OF CLEANER PRODUCTION 0959-6526 1879-1786 276 Paper: 122790 , 12 p. 2020
  • Gazdaságtudományi Doktori Minősítő Bizottság: A nemzetközi
  • SJR Scopus - Environmental Science (miscellaneous): D1
    Industry generates to the atmosphere greater and greater amounts of CO(2)harmful to the environment. Its use as a raw material in the production of synthetic fuels realizes the idea of 'Clean Production', in which products are made is a sustainable environment conditions. A chemical model was created using an innovative chemical process of CO(2)and H(2)synthesis. A thermodynamic analysis of such a process was carried out, determining energy barriers and favourable conditions for its course. This model's process comprises reactions representing three of its stages :1) synthesis of methanol (METH) and dimethyl ether (DME) with CO(2)and H-2, 2) conversion of the mixture of methanol, ether and water into light olefins and 3) hydrogenation of olefins (C-2-C-6) to the mixture of paraffins - gasoline. Calculations were made for changes for enthalpy and Gibbs free energy of respective reactions for each stage. The analysis showed that at no stage of the process the level of energy barrier does not exclude (in terms of technology) the possibility of the execution of the process. The equilibrium conversion of CO(2)within the temperature range (T): = 475-575 K, for p = 1 MPa, and H-2/CO2 = 3/1 remains within 20-25%, at products selectivity DME/METH/CO = 0.73/0.14/0.17, at 475 K and 0.0038/0.013/0.98 at 573 K. Olefins are produced in exothermic reactions of DME and METH conversion and the changes in their yield with temperature run through maximum values, which along with increase of carbons in the olefin are shifted towards lower temperatures. Thermal effects Delta H) of the olefin hydrogenation reaction are similar and are their values range between (-124) and (-137) KJ/mol. Thermodynamic limitations for these reactions no longer exist for temperature <950 K, and their lower conversion at higher temperature can be compensated with increase in pressure (Chatelier's principle). (C) 2020 Elsevier Ltd. All rights reserved.
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    2022-01-20 23:53