Catalysts for making acrylic acid from lactic acid or its derivatives in liquid phase
AssigneeThe Procter & Gamble Company
InventorsJakob Albert, Peter Wasserscheid, Nicola Taccardi, Jens Nagengast, Matthias Kehrer, Julian Kadar, Dimitris Ioannis Collias
Life of this patent
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Abstract
Catalysts for the dehydration of lactic acid, lactic acid derivatives, or mixtures thereof to acrylic acid, acrylic acid derivatives, or mixtures thereof in liquid phase comprising an ionic liquid (IL) and an acid are provided.
Claims18
A catalyst for making acrylic acid, acrylic acid derivatives, or mixtures thereof by dehydrating lactic acid, lactic acid derivatives, or mixtures thereof;
- wherein said catalyst is a molten salt and comprises an ionic liquid (IL) and an acid;
- wherein said IL has a bromide anion (Br−);
- wherein said acid is soluble in said IL and selected from the group consisting of Lewis acid, Brønsted acid, and mixtures thereof;
- wherein said Lewis acid is selected from the group consisting of CaBr2, MgBr2, AlBr3, CuBr2, and mixtures thereof;
- and wherein said Brønsted acid is selected from the group consisting of 2-bromopropionic acid (2-BrPA), pyrophosphoric acid (H4P2O7), phosphoric acid (H3PO4), sulfuric acid (H2SO4) and mixtures thereof, and has a pKa less than about 5 in water at 25° C.
A catalyst for making acrylic acid, acrylic acid derivatives, or mixtures thereof by dehydrating lactic acid, lactic acid derivatives, or mixtures thereof, wherein said catalyst is a molten salt and comprises an IL and an acid;
- wherein said IL is tetrabutylphosphonium bromide ([PBu4]Br) and said acid is pyrophosphoric acid (H4P2O7);
- and wherein the molar ratio of said [PBu4]Br to said H4P2O7 is about 4.75.
A catalyst for making acrylic acid, acrylic acid derivatives, or mixtures thereof by dehydrating lactic acid, lactic acid derivatives, or mixtures thereof;
- wherein said catalyst is a molten salt and comprises an IL and an acid;
- wherein said IL is ethyltriphenylphosphonium bromide ([EtPPh3]Br) and said acid is hydrobromic acid (HBr);
- and wherein the molar ratio of said [EtPPh3]Br to said HBr is between about 2 and about 5.
A catalyst for making acrylic acid, acrylic acid derivatives, or mixtures thereof by dehydrating lactic acid, lactic acid derivatives, or mixtures thereof;
- wherein said catalyst is a molten salt and comprises an IL and an acid;
- wherein said IL is [PBu4]Br and said acid is 2-BrPA;
- and wherein the molar ratio of said [PBu4]Br to said 2-BrPA is about 20.
Dependencies are inferred from the claim text.