TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: In the process, a solid catalyst made of a porous carrier material is preferably gamma -aluminum oxide, magnesium-aluminum spinel and/or chromium oxide, and an active component that is present on the surface of the carrier material, preferably rhodium with 0.1-1 wt.% loading and/or palladium with 0.2-2 wt.% loading, is used.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The pipes are mounted vertically in the combustion chamber and exhibits thermal expansion compensatory elements at the upper and/or lower end. Each pipe exhibits an inlet for the fraction, water vapor and an outlet for the reaction products. Each pipe is filled in its interior with the catalyst. The furnace exhibits at least a burner at the wall, ceiling and/or at the bottom. The pipes are adapted for an internal pressure of 1-15 bars, preferably 1.5-8 bars, and are used in a furnace with a flame temperature of up to 1400 degrees C.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The C6+ fraction mainly comprises a 6-10C aromatic hydrocarbon, 5-10C cyclic paraffin (cycloalkanes), 5-10C iso- and n-paraffin, and/or 6-10C alkenes. Preferred Process: The hydrocarbon from the fraction reacts at a solid catalyst with water vapor in the gas phase under heat supply. The heat necessary for the dealkylation reaction is produced by the combustion of a feedstock in the presence of air. After a compression process, the gaseous reaction products of the steam dealkylation process are isolated by means of a non-isobaric adsorption process into gaseous hydrogen and gaseous reaction by-products, preferably carbon monoxide, carbon dioxide and methane. The gaseous reaction by-products from the steam-dealkylation, preferably carbon monoxide and methane are used as feedstock for the combustion process in the presence of air. The flue gas emanating during the combustion are cooled over a heat exchanger under warming of the feedstock of the steam dealkylation process. The fraction and water vapor are made to bypass a solid catalyst by means of pipes preferably running from the top to the bottom, where the catalyst is present in the inner tube. The external heat is supplied to the pipes. The heat necessary for the dealkylation reaction is transmitted to the pipes through electromagnetic radiation, heat radiation and/or convection. The steam-dealkylation process is carried out at 400-600 degrees C, preferably 480-520 degrees C; and at 1-15 bars, preferably 1.5-8 bars. The steam-dealkylation process is carried out at a molar ratio of water vapor to hydrocarbons, at the inlet of the reactor, of 1-20, preferably 5-10. In the process, prior to the steam dealkylation step the fraction is subjected to a process for the conversion of dienes and styrenes, or for the conversion and removal of components containing sulfur, nitrogen and/or oxygen, where particularly hydrogenation process under consumption of hydrogen is used for this purpose. The reaction products of the steam dealkylation process are cooled down and then isolated in a 3-phase separation process into gaseous reaction products, hydrocarbons and water. The hydrogen developed during the steam dealkylation of the fraction is: partially or fully supplied to the feedstock for the hydrogenation process that consumes hydrogen; or supplied as a feedstock to any other hydrogen consuming hydrogenation process, preferably to a process for the conversion and removal of sulfur-containing components or to a process for the cracking of hydrocarbon-containing feedstock in an oil refinery with the help of hydrogen. Before the steam-dealkylation process, the sulfur content in the fraction is reduced to less than 10 ppm, preferably less than 1 ppm. The benzene is isolated from the hydrocarbons of the reaction products by means of a rectification process. After the rectification process, the benzene is subjected to an adsorptive fine purification process for the drying and the removal of trace components, where the benzene is led over an adsorbent, at which the trace components are adsorbed. The components in the fraction having more or less same boiling point as that of the benzene or form azeotropes are converted by the steam dealkylation process. All the reaction products having high boiling point than that of benzene and mostly consisting of non-converted feedstock of the steam dealkylation process are refluxed: from the rectification process as a feedstock into the steam dealkylation process by means of an optional hydrogenation process or prior to the steam-dealkylation process from the rectification process into a hydrogenation process of the fraction or a fraction mostly consisting of hydrocarbons with at least five carbon atoms. In the process, prior to the steam dealkylation process, non-aromatic hydrocarbons are isolated from the fraction by means of a liquid-liquid extraction process, where the non-aromatic hydrocarbons are supplied into the feedstock of the catalytic cracking process. Before the steam dealkylation process, a fraction consisting primarily of hydrocarbons with at least eight carbon atoms (C8+ fraction) is separated by distillation from the C6+ fraction, where the C8+ fraction is supplied as feedstock into a process for the extraction of p-xylene. In the process, prior to the steam dealkylation process, benzene is isolated from the C6+ fraction after the isolation of the C8+ fraction. EXAMPLE - No suitable example given.