Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2005-07-19
2005-07-19
Shah, Mukund J. (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C560S233000
Reexamination Certificate
active
06919474
ABSTRACT:
A method for production of pivalic acid comprising the steps of: (a) reacting isobutylene, carbon monoxide, and a first catalyst to produce a reaction mixture; (b) contacting the reaction mixture with water, thereby producing a crude acid product having pivalic acid and oligomeric neo-carboxylic acid; (c) separating the pivalic acid and the oligomeric neo-carboxylic acid from the crude acid product; (d) reacting the oligomeric neo-carboxylic acid with a source of carbon monoxide at a temperature of less than 200° C. in the presence of a second catalyst to produce a C5carbocation product, wherein the first and second catalyst are either the same or different; and (e) reacting the C5carbocation product with water; thereby producing pivalic acid having an overall yield of at least 80 wt. %.
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Beck Carl Robert
Broadbelt Linda J.
Davoren Dennis J.
Haubein Ned C.
Mozeleski Edmund J.
ExxonMobil Chemical Patents Inc.
Shah Mukund J.
Tucker Zachary C.
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