# US 8,785,704 B2 · Process for obtaining benzene, toluene (and naphthalene) from C1-C4-alkanes with co-dosage of hydrogen at a separate location > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,704 B2 - Document ID: US8785704B2 - Status: Granted - Kind: B2 - Application number: 12/993,956 - Filed: 2009-05-20 - Published: 2011-06-02 - Granted: 2014-07-22 - Earliest claimed: 2008-05-21 - Assignees: BASF SE - Applicants: Frank Kiesslich; Achim Gritsch; Christian Schneider; Albena Kostova - Inventors: Frank Kiesslich; Achim Gritsch; Christian Schneider; Albena Kostova - Web page: https://patentgrep.com/patent/US8785704B2 ## CPC - C07C 2/76: by condensation of hydrocarbons with partial elimination of hydrogen - Y02P 20/582: Recycling of unreacted starting or intermediate materials - Y02P 20/584: Recycling of catalysts - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The process according to claim 1, wherein at least a portion of the gas stream M formed in the regenerating (II) is fed to reaction zone 1. ### Claim 3 (depends on 1) The process according to claim 1, wherein at least a portion of the heat arising in the regeneration of the catalyst in the regenerating (II) in reaction zone 2 is fed to reaction zone 1. ### Claim 4 (depends on 1) The process according to claim 1, wherein the catalyst is mixed with an inert material. ### Claim 5 (depends on 1) The process according to claim 1, wherein at least a portion of the heat arising in the regenerating of the catalyst in (II) in reaction zone 2 is fed directly to reaction zone 1 by transferring at least a portion of the regenerated catalyst from reaction zone 2 to reaction zone 1. ### Claim 6 (depends on 1) The process according to claim 1, wherein at least a portion of the heat arising in the regenerating of the catalyst in (II) in reaction zone 2 is fed directly to reaction zone 1 through the gas stream M from reaction zone 2 to reaction zone 1. ### Claim 7 (depends on 1) The process according to claim 1, wherein at least a portion of heat required in (I) is supplied by: i) discharging at least a portion of the catalyst present in reaction zone 1 or 2 from reaction zone 1 or 2, as a discharged catalyst; ii) heating the discharged catalyst to a temperature above a temperature in reaction zone 1, to give a heated catalyst; and iii) recycling the heated catalyst into reaction zone 1. ### Claim 8 (depends on 1) The process according to claim 1, wherein a temperature on entry into reaction zone 2 is above the temperature on entry into reaction zone 1. ### Claim 9 (depends on 1) The process according to claim 1, wherein reaction zone 1 and reaction zone 2 are spatially separated in one reactor. ### Claim 10 (depends on 1) The process according to claim 1, wherein reaction zone 1 and reaction zone 2 are spatially separated in different reactors. ### Claim 11 (depends on 1) The process according to claim 1, wherein the catalyst is present as a fluidized bed in reaction zone 1, in reaction zone 2, or in both reaction zones. ### Claim 12 (depends on 1) The process according to claim 1, wherein reactant stream E comprises at least 50 mol % of the at least one C1-C4-aliphatic compound. ### Claim 13 (depends on 1) The process according to claim 1, wherein reactant stream E comprises from 0.1 to 10% by volume of hydrogen. ### Claim 14 (depends on 1) The process according to claim 1, wherein gas stream H comprises at least 50% by volume of hydrogen. ### Claim 15 (depends on 1) The process according to claim 1, wherein the catalyst comprises at least one aluminosilicate and at least one metal selected from the group consisting of Mo, W, Mn, and Re. ### Claim 16 (depends on 1) The process according to claim 1, wherein the catalyst comprises at least one metal selected from the group consisting of Mo, W, Mn and Re, and at least one further metal selected from the group consisting of Cr, Mn, V, Zn, Zr, Ga, Cu, Ni, Co, and Fe. ### Claim 17 (depends on 2) The process according to claim 2, wherein reactant stream E comprises at least 50 mol % of the at least one C1-C4-aliphatic compound. ### Claim 18 (depends on 3) The process according to claim 3, wherein reactant stream E comprises at least 50 mol % of the at least one C1-C4-aliphatic compound.