Disclosed are processes for industrially advantageously producing at a good yield respectively, a hydrogenated aromatic polycarboxylic acid and an acid anhydride thereof each having a high purity. The present invention provides processes for producing a hydrogenated aromatic polycarboxylic acid by (1) hydrogenating an aromatic polycarboxylic acid at a hydrogen partial pressure of 1 MPa or more by a batch system in the presence of a catalyst containing rhodium and palladium in a proportion of 0.5 to 10 parts by weight per 100 parts by weight of the aromatic polycarboxylic acid and by (2) feeding an aromatic polycarboxylic acid to a filling bed of a catalyst containing rhodium and palladium at a WHSV of 1 to 100 h
−1
to hydrogenate it at a hydrogen partial pressure of 1 MPa or more by a continuous flow system, and a process for producing a hydrogenated aromatic polycarboxylic anhydride by subjecting the hydrogenated aromatic polycarboxylic acid obtained by the processes described above to dehydration reaction with acetic anhydride of 0.64 to 5.7 times mole based on a carboxyl group of the hydrogenated aromatic polycarboxylic acid.
本发明揭示了分别以良好的收率工业化地生产高纯度氢化芳香族多
羧酸及其酸酐的方法。本发明提供了一种通过(1)在催化剂中加入含有
铑和
钯的催化剂,其比例为每100份芳香族多
羧酸中0.5至10份重量,在氢分压力为1 MPa或更高的情况下,通过批量系统对芳香族多
羧酸进行氢化;以及(2)将芳香族多
羧酸送入含有
铑和
钯的催化剂填充层中,以1至100 h-1的WHSV速率在氢分压力为1 MPa或更高的连续流系统中进行氢化的方法,来生产氢化芳香族多
羧酸的方法;以及通过将以上描述的氢化芳香族多
羧酸与以0.64至5.7倍摩尔的
乙酸酐为基础的羧基进行脱
水反应,来制备氢化芳香族多
羧酸酐的方法。