Sulfiding Process for Aromatic Transalkylations

摘要

A process is provided for producing xylene by transalkylation including introducing sulfur into a reactor containing a catalyst system prior to first introduction of hydrocarbon feedstock into the reactor; introducing hydrocarbon feedstock into the reactor upon the concentration of sulfur downstream of the catalyst system meeting a predetermined sulfur breakthrough concentration; continuing sulfur introduction for a period of time after first introducing hydrocarbon feedstock into the reactor; reducing the concentration of sulfur introduced upon ΔT decreasing to or below a predetermined sulfur reduction threshold; and discontinuing sulfur introduction upon ΔT decreasing to or below a predetermined sulfur shutoff threshold.

主权项

1. A process for producing xylene by transalkylation of two or more hydrocarbon feedstocks, the process comprising:
(a) introducing sulfur into a reactor containing a catalyst system prior to first introduction of hydrocarbon feedstock into the reactor; (b) introducing hydrocarbon feedstock into the reactor upon the concentration of sulfur downstream of the catalyst system meeting a predetermined sulfur breakthrough concentration; (c) continuing sulfur introduction for 1-24 hours after first introducing hydrocarbon feedstock into the reactor; (d) reducing the concentration of sulfur introduced upon ΔT decreasing to or below a is predetermined sulfur reduction threshold, wherein ΔT is the difference between a temperature in the reactor upstream of the catalyst system and a temperature in the reactor downstream of the catalyst system; and (e) discontinuing sulfur introduction upon ΔT decreasing to or below a predetermined sulfur shutoff threshold, wherein the predetermined sulfur shutoff threshold is less than the predetermined sulfur reduction threshold.