AN OXIDATION PROCESS TO PRODUCE A PURIFIED CARBOXYLIC ACID PRODUCT VIA SOLVENT DISPLACEMENT AND POST OXIDATION
申请人:Eastman Chemical Company
公开号:EP3617200A1
公开(公告)日:2020-03-04
Disclosed is a process to produce a dry purified carboxylic acid product comprising furan-2,5-dicarboxylic acid (FDCA). The process comprises oxidizing at least one oxidizable compound selected from the following group: 5-(hydroxymethyl)furfural (5-HMF), 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), mixed feed-stocks of 5-HMF and 5-HMF esters and mixed feed-stocks of 5-HMF and 5-HMF ethers and mixed feed-stocks of 5-HMF and 5-alkyl furfurals to generate a crude carboxylic acid slurry comprising FDCA, removing impurities from a crude carboxylic acid slurry in a liquid displacement zone to form a low impurity slurry stream. The low impurity slurry stream is further treated in a secondary oxidation zone to produce a secondary oxidation slurry stream which is routed to a crystallization zone to form a crystallized slurry stream. The crystallized slurry stream is cooled in a cooling zone and the resulting cooled crystallized slurry stream is routed to a solid-liquid separation zone to generate a purified wet cake stream comprising FDCA that is dried in a drying zone to generate a dry carboxylic acid product stream comprising purified FDCA (pFDCA).
本发明公开了一种生产包括呋喃-2,5-二羧酸(FDCA)的干法纯化羧酸产品的工艺。该工艺包括氧化至少一种选自下组的可氧化化合物:5-羟甲基糠醛(5-HMF)、5-HMF 酯(5-R(CO)OCH2-糠醛,其中 R = 烷基、环烷基和芳基)、5-HMF 醚(5-R'OCH2-糠醛,其中 R' = 烷基、环烷基和芳基)、5-烷基糠醛(5-R"-糠醛,其中 R" = 烷基、环烷基和芳基)、5-HMF和5-HMF酯的混合原料、5-HMF和5-HMF醚的混合原料以及5-HMF和5-烷基呋喃的混合原料,生成包含FDCA的粗羧酸浆液,在液体置换区中去除粗羧酸浆液中的杂质,形成低杂质浆液流。低杂质浆料流在二次氧化区进一步处理,产生二次氧化浆料流,该浆料流被输送到结晶区,形成结晶浆料流。结晶浆液流在冷却区冷却,冷却后的结晶浆液流进入固液分离区,生成含 FDCA 的纯化湿饼流,湿饼流在干燥区干燥,生成含纯化 FDCA(pFDCA)的干羧酸产品流。