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A process under development by Amoco Chemicals Corp. for increasing the yields of benzene and xylenes from the C/sub 7/-C/sub 8/ fraction of pyrolysis gasoline

Conference · · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
OSTI ID:6726234
;
A process for increasing the yields of benzene and xylenes from the C/sub 7/-C/sub 8/ fraction of pyrolysis gasoline, the aromatics conversion (AC) process, involves mixing the feed with hydrogen and recycle toluene and features a catalyst which can simultaneously disproportionate the toluene to benzene and xylenes, hydrodeethylate the ethylbenzene to benzene and ethane, and crack the C/sub 7/-C/sub 9/ nonaromatics to mainly C/sub 2/-C/sub 4/ alkanes without destroying xylenes. A typical feed containing 5.6Vertical Bar3< by wt of C/sub 1/-C/sub 5/ alkanes, 2.7Vertical Bar3< by wt of C/sub 7/-C/sub 9/ alkanes, 65.1Vertical Bar3< by wt of benzene, 10.3Vertical Bar3< by wt of toluene, 14.7Vertical Bar3< by wt of ethylbenzene, and 1.6Vertical Bar3< of xylenes gives a typical product which contains 12.6Vertical Bar3< by wt of C/sub 1/-C/sub 5/ alkanes, 21.0Vertical Bar3< by wt of benzene, 39.1Vertical Bar3< by wt of toluene, 0.6Vertical Bar3< by wt of ethylbenzene, 20.9Vertical Bar3< of xylenes, 5.3Vertical Bar3< of C/sub 9/ aromatics, and 0.5Vertical Bar3< of C/sub 10/ aromatics, and is thus similar to the calculated thermodynamic equilibrium composition at 800/sup 0/-900/sup 0/F. The fixed bed reactor operates at 800/sup 0/-900/sup 0/F, 150-500 psia, and a 5:1-10:1 hydrogen-hydrocarbon mole ratio. The process can be integrated with the hydrotreating required for preliminary removal of olefins and sulfur, thus giving to a considerable economic advantage and eliminating the usual solvent extraction stage used to separate aromatics from alkanes and naphthenes.
Research Organization:
Amoco Chem. Corp.
OSTI ID:
6726234
Report Number(s):
CONF-790415-
Conference Information:
Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 24:1
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020500* -- Petroleum-- Products &amp; By-Products
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ALKYLATED AROMATICS
AROMATICS
BENZENE
CATALYSTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
FUELS
FUNCTIONAL MODELS
GASOLINE
HIGH TEMPERATURE
HYDROCARBONS
LIQUID FUELS
MEDIUM PRESSURE
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PROCESS DEVELOPMENT UNITS
PYROLYSIS
THERMOCHEMICAL PROCESSES
XYLENES
YIELDS