Process for converting dienes and oxygenates to para-xylene and light olefins
AssigneeMobil Oil Corporation
InventorsJeffrey S. Beck, Stephen H. Brown, William A. Weber
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Abstract
A process useful in steam cracking is disclosed for selectively converting a feed comprising C4+ dienes and oxygenate to a product comprising increased C2+ monoolefins and para-xylene levels by contacting said feed under diolefin conversion conditions with a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-100 sec−1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa), a temperature of 430° C. and 0.5 WHSV.
Claims20
A process for selectively converting a feed comprising C4+ dienes and oxygenate to a product comprising increased C2+ monoolefins and para-xylene levels which comprises
- a) contacting said feed under diolefin conversion conditions with a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-100 sec−1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr,
- b) recovering a diolefins-depleted product stream rich in monoolefins and C7+ aromatics, including para-xylene;
- and
- c) optionally recovering a C2+ monoolefins rich stream from said diolefins depleted product stream to provide a C7+ aromatics rich stream.
A steam cracking process for converting ethane to C2+ olefins which comprises
- i) contacting an ethane-containing feed with steam under steam cracking conditions to provide a steam cracked product stream comprising C2+ olefins and C4+ diolefins,
- ii) recovering ethylene and propylene from said steam cracked product stream to provide a C4+ diolefins rich byproduct stream,
- iii) contacting said byproduct stream, or boiling fractions thereof enriched in dienes, in the presence of oxygenate under diolefin conversion conditions with a catalyst comprising a porous crystalline material having a Diffusion Parameter for 2,2-dimethylbutane of about 0.1-100 sec−1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr,
- iv) recovering a diolefins depleted stream rich in C2+ mono-olefins and C8+ aromatics, including para-xylene,
- v) separating ethylene and propylene and aromatics from said diolefins depleted stream.
Dependencies are inferred from the claim text.