主权项 |
1. A process for producing a carboxylic acid composition, said process comprising:
oxidizing in a primary oxidation zone, at least one oxidizable compound comprising at least one selected from the group consisting of 5-(hydroxymethyl)furfural (5-HMF), 5-(chloromethyl)furfural (5-CMF), 2,5-dimethylfuran (2,5 -DMF), 5-HMF esters (5-R(CO)OCH2-furfural where R=alkyl, cycloalkyl and aryl), 5-HMF ethers (5-R′OCH2-furfural, where R′=alkyl, cycloalkyl and aryl), 5-alkyl furfurals (5-R″-furfural, where R″=alkyl, cycloalkyl and aryl), alkylcarboxylate of methyfuran (5-R′″O(CO)-methylfuran, where R′″=alkyl, cycloalkyl), alkylcarboxylate of alkoxyfuran (5-R″″O(CO)—OR′″″furan, where R″″=alkyl, cycloalkyl and aryl and R′″″=alkyl, cycloalkyl and aryl), mixed feed-stocks of 5-HMF and 5-HMF esters and mixed feed-stocks of 5-HMF and 5-HMF ethers, mixed feed-stocks of 5-HMF and 5-alkyl furfurals, mixed feed-stocks of 5-HMF and 5-CMF, mixed feed-stocks of 5-HMF and 2,5-DMF, mixed feed-stocks of 5-HMF and alkylcarboxylate of methyfuran, mixed feed-stocks of 5-HMF and alkylcarboxylate of alkoxyfuran, in the presence of a solvent stream, an oxidizing gas, and a catalyst system at a temperature of about 110° C. to about 220° C. to produce said carboxylic acid composition comprising furandicarboxylic acid at a yield of 80% or more; wherein said primary oxidation zone comprises at least one oxidation reactor, wherein said at least one oxidation reactor in said oxidation zone has been previously used in an terephthalic acid and/or isophthalic acid process, |