Patent EA-004599-B1 (EA)
Title: Method for dehydrogenation of hydrocarbons
Inventor: SCHINDLER GOETZ-PETER
IPC: B01J23/58
Filed: 2001-09-14
Abstract: 1. A method for the heterogenically catalysed dehydrogenation in one or several reaction zones of one or several C2-C30 hydrocarbons that can be dehydrogenated, in a reaction gas mixture containing said hydrocarbons, at least one portion of the required dehydrogenation heat is generated directly in the reaction gas mixture in at least one reaction zone by the combustion of hydrogen, the hydrocarbon(s) and/or of carbon said reaction gas mixture, characterized in that the reaction gas mixture which contains the hydrocarbon(s) that can be dehydrogenated, being brought into contact with a Lewis-acidic dehydrogenation catalyst that essentially exhibits no Broensted acidity, wherein the dehydrogenation catalyst has the Lewis acidic more than 3 units (AU) determined by IR absorption spectrum of pyridin adsorbed on the catalyst. 2. The method according to claim 1, characterized in that the dehydrogenation catalyst comprises a metal oxide selected from zirconium oxide, aluminum oxide, silicon dioxide, titanium dioxide, magnesium oxide, lanthanum oxide, and cerium oxide. 3. The method according to claim 2, characterized in that the dehydrogenation catalyst comprises zirconium dioxide and/or silicon dioxide. 4. The method according to claims 1-3, characterized in that dehydrogenation catalyst comprises at least one element of VIII subgroup, at least one element of I or II main group, at least one element of III or IV main group and at least one element of III subgroup, including lanthanoids and actinoids. 5. The method according to one of claims 1-4, characterized in that that dehydrogenation catalyst comprises platinum and/or palladium. 6. The method according to one of claims 1-5, characterized in that that dehydrogenation catalyst comprises caesium and/or potassium. 7. The method according to one of claims 1-6, characterized in that that dehydrogenation catalyst comprises lanthanum and cerium. 8. The method according to one of claims 1-7, characterized in that dehydrogenation catalyst comprises tin. 9. The method according to one of claims 1-8, characterized in that dehydrogenation catalyst has a bimodal distribution of pore radii, wherein 70-100% of pores has the diameter less than 20 mum or the diameter ranges between 40-5000 mum. 10. The method according to one of claims 1-9, characterized in that the reaction gas mixture comprises water vapour. 11. The method according to one of claims 1-10, characterized in that hydrogen is admixed to the reaction gas mixture. 12. The method according to claim 11, characterized in that at least one reaction zone comprises a catalyst, which selectively catalyses combustion of hydrogen using oxygen in the presence of hydrocarbons. 13. The method according to one of claims 1-12, characterized in that the catalyst which catalyses the combustion of hydrogen comprises oxides or phosphates selected from the group consisting of germanium, tin, lead, arsenic, antimony or bismuth oxides or phosphates. 14. The method according to one of claims 1-13, characterized in that the catalyst which catalyses the combustion of hydrogen comprises precious metal of VIII or I subgroup. 15. The method according to one of claims 1-14, characterized in that the dehydrogenation is carried out in a lattice reactor.