Catalyst for preparing unsaturated carboxylic acids and derivatives thereof
AssigneeLG Chem, Ltd.
InventorsJungup BANG, Jaeyoung KIM, Wonbae BYUN, Jae Soon CHOI, Mahnjung KIM, Cheolock SONG, Mira KIM
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Abstract
A catalyst for preparing an unsaturated carboxylic acid or derivative thereof, the catalyst capable of preparing the unsaturated carboxylic acid or derivative thereof in a high yield over a long period of time during a dehydration reaction of a hydroxycarboxylic acid or a derivative thereof.
Claims12
A catalyst for preparing an unsaturated carboxylic acid or a derivative thereof, the catalyst comprising two or more types of hydroxyapatite with different amounts of alkali metal in the crystal, wherein phosphorus (P), calcium (Ca), and alkali metal (M) present on the catalyst surface satisfy the following conditions of (i) and (ii):
- (i) a molar ratio of calcium to phosphorus:
- 1.0 or more and 1.2 or less, and
- (ii) a total molar ratio of calcium and alkali metal to phosphorus:
- 1.2 or more and 1.6 or less.
Dependencies are inferred from the claim text.