偏苯三酸酐和均苯四酸二酐的新技术开发

DEVELOPMENT OF NEW TECHNOLOGY ON THE SYNTHESIS OF TRIMELLITIC ANHYDRIDE AND PYROMELLITIC DIANHYDRIDE

评述了偏苯二酸酐和均苯四酸二酐的新技术评发。分别介绍了由间二甲苯或偏三甲苯经一氧化碳甲酰化和芳香醛水溶剂空气氧化生产偏苯三酸酐或均苯四酸二酐的工艺过程及其催化剂，并与传统生产工艺作了比较。

The development of new technology on the synthesis of trimellitic anhydride (TMA) and py-romellitic dianhydride (PMDA) is reviewed. The processes and catalysts for TMA or PMDA produc-tion by formylation of m-xylene (or pseudocumene) with carbon monoxide, or by oxidation of aro-matic aldehyde with air in water media are introduced separately. A comparison with conventionalproduction process is also made.