A method of producing an alkylaromatic by the alkylation of an aromatic with an alkylating agent, the method comprising: providing at least one reaction zone containing a regenerated H-beta zeolite catalyst and wherein the at least one reaction zone comprises at least one preliminary alkylation reactor and at least one primary alkylation reactor and wherein the H-beta zeolite catalyst in the first preliminary alkylation system is regenerated in-situ; introducing a feed stream comprising an aromatic and an alkylating agent to the reaction zone; and reacting at least a portion of the aromatic under alkylation conditions to produce an alkylaromatic; wherein the production of the alkylaromatic with the regenerated H-beta zeolite catalyst is within 90% of a production rate of an alkylaromatic with a fresh H-beta zeolite; wherein the regenerated H-beta zeolite catalyst has a deactivation rate that is no more than 120% of the deactivation rate of a fresh H-beta zeolite catalyst wherein the feed stream further comprises catalyst poisons, being nitrogen components, averaging at least 30 ppb wherein said regenerated H-beta zeolite catalyst is regenerated by: - the H-beta zeolite catalyst is heated to a first temperature of 370°C under a gas containing nitrogen - the oxygen content is then staged upward starting with a gas containing 0.2 mol% oxygen until the catalyst regeneration temperature increases up to between 480°C to 540°C - the oxygen content is then staged upward to a gas containing 2.0 mol % to maintain the catalyst regeneration temperature at 510°C until the output stream has an oxygen content of 0.2 mol% - the H-beta zeolite catalyst is heated to a second temperature of 500°C; the oxygen content in the output stream increases due to a lack of consumption and reaches the content of the injected gas being 2.0 mol %. providing at least one reaction zone containing a regenerated H-beta zeolite catalyst and wherein the at least one reaction zone comprises at least one preliminary alkylation reactor and at least one primary alkylation reactor and wherein the H-beta zeolite catalyst in the first preliminary alkylation system is regenerated in-situ; introducing a feed stream comprising an aromatic and an alkylating agent to the reaction zone; and reacting at least a portion of the aromatic under alkylation conditions to produce an alkylaromatic; wherein the production of the alkylaromatic with the regenerated H-beta zeolite catalyst is within 90% of a production rate of an alkylaromatic with a fresh H-beta zeolite; wherein the regenerated H-beta zeolite catalyst has a deactivation rate that is no more than 120% of the deactivation rate of a fresh H-beta zeolite catalyst wherein the feed stream further comprises catalyst poisons, being nitrogen components, averaging at least 30 ppb wherein said regenerated H-beta zeolite catalyst is regenerated by: - the H-beta zeolite catalyst is heated to a first temperature of 370°C under a gas containing nitrogen - the oxygen content is then staged upward starting with a gas containing 0.2 mol% oxygen until the catalyst regeneration temperature increases up to between 480°C to 540°C - the oxygen content is then staged upward to a gas containing 2.0 mol % to maintain the catalyst regeneration temperature at 510°C until the output stream has an oxygen content of 0.2 mol% - the H-beta zeolite catalyst is heated to a second temperature of 500°C; the oxygen content in the output stream increases due to a lack of consumption and reaches the content of the injected gas being 2.0 mol %. - the H-beta zeolite catalyst is heated to a first temperature of 370°C under a gas containing nitrogen - the oxygen content is then staged upward starting with a gas containing 0.2 mol% oxygen until the catalyst regeneration temperature increases up to between 480°C to 540°C - the oxygen content is then staged upward to a gas containing 2.0 mol % to maintain the catalyst regeneration temperature at 510°C until the output stream has an oxygen content of 0.2 mol% - the H-beta zeolite catalyst is heated to a second temperature of 500°C; the oxygen content in the output stream increases due to a lack of consumption and reaches the content of the injected gas being 2.0 mol %.