Chemistry of hydrocarbon compounds – Miscellaneous considerations – Reaction stopping or retarding
Reexamination Certificate
2005-08-02
2005-08-02
Dang, Thuan D (Department: 1764)
Chemistry of hydrocarbon compounds
Miscellaneous considerations
Reaction stopping or retarding
C585S709000, C585S470000, C502S020000
Reexamination Certificate
active
06924407
ABSTRACT:
Improved methods for conducting solid acid-catalyzed, near- or supercritical heterogeneous chemical reactions (e.g., alkylation reactions) are provided which give enhanced product yields and permit longer processing runs. The preferred reactions of the invention are carried out in the presence of a solid macroporous catalyst having a surface area of from about 50-400 m2/g and a pore size of from about 70-150 Å. Product selectivity is enhanced by pressure-tuning of the reaction to promote production and separation of desired reaction products. In continuous processing, the chemical reaction may be interrupted before significant catalyst deactivation, followed by increasing reactor pressure and/or reducing reactor temperature to remove the accumulating coke; when the catalyst is regenerated, the original reaction conditions and reactant introduction may be resumed.
REFERENCES:
patent: 4056578 (1977-11-01), McClure et al.
patent: 5491278 (1996-02-01), Angstadt et al.
patent: 5907075 (1999-05-01), Subramaniam et al.
Lyon Christopher James
Subramaniam Bala
Dang Thuan D
Hovey & Williams, LLP
The University of Kansas
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