Method and device for carrying out endothermic gas phase-solid or gas-solid reactions

A process for conducting an endothermic gas phase or gas-solid reactions, the process comprising:

• conducting an endothermic reaction of a reactant-containing gas in a production step in a first reactor zone, a production zone, which is at least partly filled with solid particles, where the solid particles are in the form of a fixed bed, of a moving bed and in sections, or in the form of a fluidized bed,
• drawing off a product-containing gas stream from the production zone, wherein the product-containing gas stream comprises one or more of carbon, hydrogen, olefins, propylene, butene, styrene, benzene, synthesis gas, CO, or HCN,
• guiding the product-containing gas stream through a second reactor zone, a heat recovery zone, which at least partly comprises a fixed bed, where the heat from the product-containing gas stream is stored in the fixed bed,
• in a subsequent purge step, guiding an inert purge gas through the production zone and the heat recovery zone in the same flow direction as that of the product-containing gas stream,
• wherein the purge gas comprises at least one gas selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, steam, nitrogen, argon, and mixtures thereof,
• in a heating zone disposed between the production zone and the heat recovery zone, introducing the heat required for the endothermic reaction into the product-containing gas stream and into the purge stream or into the purge stream,
• and then, in a regeneration phase, passing a gas through the two reactor zones in a reverse flow direction compared to the flow direction of the purge gas and heating up the production zone,
• wherein the process is operated cyclically,
• wherein the production step takes between 20% and 60% of a period duration of the process, the purge step takes between 10% and 40% of the period duration, and the regeneration phase between 20% and 60% of the period duration.