Process for obtaining benzene, toluene (and naphthalene) from C1-C4-alkanes with co-dosage of hydrogen at a separate location

摘要

The present invention relates to a process for nonoxidatively dehydroaromatizing a reactant stream comprising C1-C4-aliphatics by converting the reactant stream in the presence of a catalyst in a reaction zone 1 to a product stream P comprising aromatic hydrocarbons, and regenerating the catalyst whose activity has been reduced by deposited coke with a hydrogen-comprising mixture H in a reaction zone 2, wherein at least a portion of the deposited coke is converted to methane and at least a portion of the methane formed is fed to reaction zone 1.

主权项

1. A process for nonoxidatively dehydroaromatizing a reactant stream E, the process comprising
(I) converting the reactant stream E under nonoxidative conditions in the presence of a catalyst in a reaction zone 1, to a product stream P comprising at least one aromatic hydrocarbon; (II) regenerating the catalyst, whose activity has been reduced by deposited coke from the converting (I), with a hydrogen-comprising gas stream H in a reaction zone 2, which converts at least a portion of the deposited coke to methane, generates heat, gives regenerated catalyst, and forms a methane-comprising gas stream M; and (III) feeding at least a portion of the methane formed in the regenerating (II) in reaction zone 2, to reaction zone 1,wherein the reactant stream E comprises at least one C1-C4-aliphatic compound, and
wherein reaction zone 1 is converted to reaction zone 2 at time intervals by reducing reactant stream E and supplying gas stream H, reaction zone 2 is converted to reaction zone 1 at time intervals by reducing gas stream H and supplying reactant stream E, and the conversion of reaction zone 1 to reaction zone 2 and the conversion of reaction zone 2 to reaction zone 1 are carried out coupled to one another in alternation, such that a reaction zone is present at time intervals alternatingly as reaction zone 1 in which the dehydroaromatization takes place and as reaction zone 2 in which at least a portion of the coke deposited is converted to methane with the aid of hydrogen.