Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Phosphorus or compound containing same
Reexamination Certificate
2006-05-16
2006-05-16
Langel, Wayne A. (Department: 1754)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Phosphorus or compound containing same
C502S202000, C502S204000, C502S206000, C502S209000, C502S210000, C502S211000, C502S232000, C502S305000, C502S353000, C562S532000
Reexamination Certificate
active
07045482
ABSTRACT:
The present invention relates to a method for preparing a heteropolyacid catalyst and method for preparing methacrylic acid using thereof. More particularly, the present invention relates to a method for preparing heteropolyacid catalyst, which is produced by the recrystallization of a heteropolyacid and/or its salt dissolved in a basic organic solvent and heat-treatment, and further to a method for preparing metachrylic acid using thereof, wherein the use of the heteropolyacid catalyst increases the activity of oxidation reaction induced by the modified electronic properties of heteropolyanions and provides high efficiency production of methacrylic acid from methacrolein, since the basic property of solvent inhibits peculiar acidic property of heteropolyacid.
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Chun Myung-Suk
Nam Suk Woo
Song In Kyu
Finnegan Henderson Farabow Garrett & Dunner LLP
Korea Institute of Science and Technology
Langel Wayne A.
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