Patent ID: 9714208
Date: 2017-07-25
CPC Classifications: A61F,B01J,C07C,C08F

Claim:
1. A method of making acrylic acid, acrylic acid derivatives, or mixtures thereof comprising contacting a stream comprising hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof with a catalyst comprising: (a) at least two different condensed phosphate anions selected from the group consisting of formulae (I) and (Ib), wherein in formula I n is at least 2; and (b) at least two different cations, wherein the catalyst is essentially neutrally charged; and further, wherein the molar ratio of phosphorus to said at least two different cations is between about 0.7 and about 1.7, whereby acrylic acid, acrylic acid derivatives, or mixtures thereof are produced as a result of said stream being contacted with said catalyst, further, wherein said cations comprise: at least one monovalent cation; and at least one polyvalent cation.