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US 9,751,823 B2Granted
Processes for making methacrylic acid
AssigneesArcher Daniels Midland Company, Washington State University
InventorsJunming Sun, Changjun Liu, Yong Wang, Kevin Martin, Padmesh Venkitasubramanian
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Abstract
Processes are described for making methacrylic acid via methacrolein from a biobased isobutene, wherein the biobased isobutene is prepared from ethanol or from acetic acid in the presence of a ZnxZryOz mixed oxide catalyst, the biobased isobutene is oxidized to methacrolein and the methacrolein is further oxidized to methacrylic acid.
Claims4
A process for making methacrylic acid via methacrolein from a biobased isobutene, comprising:
- in a single, first step and without isolating any intermediate species, converting acetic acid to isobutene in the presence of a mixed oxide catalyst comprised of oxides of Zn and Zr in which the ratio of Zn:Zr is from about 1:100 to about 10:1;
- oxidizing the isobutene to methacrolein with a source of oxygen in the presence of a catalyst;
- and further oxidizing methacrolein to methacrylic acid with a source of oxygen in the presence of a catalyst.
Dependencies are inferred from the claim text.