反应详情

As represented by the following reaction formula (VII), after 30% fuming sulfuric acid (2.1 L) was added to 300 g of acenaphtho[1,2-b]quinoxaline and the mixture was stirred at room temperature for 24 hours, the resultant was heated to 130° C. and stirred for 32 hours for reaction. While keeping the obtained solution at 40° C. to 50° C., 4.5 L of ion exchange water was added for dilution, and the resultant was further stirred for 3 hours. The precipitate was filtered and recrystallized with sulfuric acid. After being washed with 1 L of acetone for three times, the resultant was filtered and subjected to vacuum drying at 60° C. for 12 hours to obtain acenaphtho[1,2-b]quinoxaline-2,5-disulfonic acid.

1. temperaturethe resultant was heated to 130° C.
2. stirringstirred for 32 hours for reaction
3. customat 40° C. to 50° C.
4. stirringthe resultant was further stirred for 3 hours
5. filtrationThe precipitate was filtered
6. customrecrystallized with sulfuric acid
7. washAfter being washed with 1 L of acetone for three times
8. filtrationthe resultant was filtered
9. customdrying at 60° C. for 12 hours