Processes for preparing aldaric, aldonic, and uronic acids
AssigneeArcher Daniels Midland Company
InventorsKarl Albrecht, James Brazdil, Andrew Ingram
Life of this patent
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Abstract
Various processes for preparing aldaric acids, aldonic acids, uronic acids, and/or lactone(s) thereof are described. For example, processes for preparing a C5-C6 aldaric acid and/or lactone(s) thereof by the catalytic oxidation of a C5-C6 aldonic acid and/or lactone(s) thereof and/or a C5-C6 aldose are described.
Claims14
A process for preparing a C5-C6 aldaric acid and/or lactone(s) thereof via catalytic oxidation from a feed mixture comprising an oxidation reaction inhibitor, the process comprising:
- feeding a feed mixture comprising
- (a) at least one oxidation reactant selected from the group consisting of a C5-C6 aldose, a C5-C6 aldonic acid and/or lactone(s) thereof, a C5-C6 uronic acid and/or lactone(s) thereof, and mixtures thereof, and
- (b) an oxidation reaction inhibitor
- to a separation zone to separate at least a portion of the oxidation reaction inhibitor from the feed mixture and form a first fraction comprising at least a portion of the oxidation reactant and a second fraction comprising at least a portion of the oxidation reaction inhibitor;
- feeding at least a portion of the first fraction comprising the oxidation reactant to a reaction zone;
- and
- reacting the oxidation reactant in the presence of oxygen and an oxidation catalyst in the reaction zone to form a reaction mixture comprising the C5-C6 aldaric acid and/or lactone(s) thereof;
- wherein
- (i) the oxidation reaction inhibitor comprises a C3 alcohol and/or a C3 acid, and
- (ii) the concentration of said oxidation reaction inhibitor in the first fraction is about 0.5 wt. % or less.
A process for preparing a C5-C6 aldaric acid and/or lactone(s) thereof via catalytic oxidation from a feed mixture comprising an oxidation reaction inhibitor, the process comprising:
- feeding a feed mixture comprising at least one oxidation reactant selected from the group consisting of a C5-C6 aldose, a C5-C6 aldonic acid and/or lactone(s) thereof, a C5-C6 uronic acid and/or lactone(s) thereof, and mixtures thereof to a reaction zone;
- reacting the oxidation reactant in the presence of oxygen and an oxidation catalyst in the reaction zone to form a reaction mixture comprising (a) the C5-C6 aldaric acid and/or lactone(s) thereof, (b) unreacted oxidation reactant(s) and/or on-path intermediate(s) thereof, and (c) an oxidation reaction inhibitor;
- feeding the reaction mixture to a separation zone to separate at least a portion of the C5-C6 aldaric acid and/or lactone(s) thereof from the reaction mixture and form a product fraction comprising the C5-C6 aldaric acid and/or lactone(s) thereof and a recycle fraction comprising the unreacted oxidation reactant(s) and/or on-path intermediate(s) thereof and the oxidation reaction inhibitor;
- removing a first portion of the recycle fraction from the process;
- and
- recycling a second portion of the recycle fraction to the reaction zone or feed thereto;
- wherein
- (i) the oxidation reaction inhibitor comprises a C3 alcohol and/or a C3 acid, and
- (ii) the concentration of said oxidation reaction inhibitor in the second portion of the recycle fraction is about 0.5 wt. % or less.
Dependencies are inferred from the claim text.