There are two steps in the process.First MA is absorbed from the gaseous mixture by solvent butanol, and monobutyl maleate (MBM) is generated in the absorber.

• 在吸收塔中用丁醇吸收反应气体中的顺酐生成顺丁烯二酸单丁酯,然后在反应精馏塔中将单酯分解为顺酐和丁醇。