反应详情

888 g (6 mols) of phthalic anhydride are added in portions to 412.5 g of 98% strength ethanolamine (6.6 mols), and the mixture is heated in the course of 2 hours from 110° to 190° C., until 114 g of water have been distilled off. Excess ethanolamine is then removed under reduced pressure down to 145° C./0.1 mbar. The yield is quantitative: 1,145 g.

1. distillationhave been distilled off
2. customExcess ethanolamine is then removed under reduced pressure down to 145° C./0.1 mbar