Patent ID: 9199893
Filing Date: 2015-12-01
Classification: C07C,C10G

Abstract:
1. A process for producing aromatics comprising: (a) passing a hydrocarbon stream comprising n-butenes and isobutene to a first oligomerization unit operated under a condition to convert isobutene to form dimers but keep n-butenes unreacted to generate a first oligomerization unit effluent comprising C4 hydrocarbons and at least C8 olefins; (b) passing the first oligomerization unit effluent to a separation unit to separate the first oligomerization unit effluent into a first overhead stream comprising C4 hydrocarbons including unreacted n-butenes and a first bottoms stream comprising at least C8 olefins; (c) passing the first overhead stream to a second oligomerization unit operated under a condition to convert unreacted n-butene to 1-octene to generate a second oligomerization unit effluent comprising C4 hydrocarbons and 1-octene; (d) passing the second oligomerization unit effluent to a second separation unit to separate the second oligomerization unit effluent into a second overhead stream comprising unreacted n-butenes and a second bottoms stream comprising octene-1; (e) passing a naphtha stream and the second bottoms stream to a reforming unit containing a catalyst comprising about 0.01 to about 2 wt. % of platinum, about 0.01 to about 5 wt. % of tin, about 0.1 to about 2 wt. of chlorine, about 400 to 1,100 wppm of potassium, and alumina as a support; (f) reforming the naphtha stream and the second bottoms stream in the said reforming unit at a temperature greater than 500° C. to yield aromatics including xylenes.