反应详情

1,050 g of sulfuric acid was added to 1,280 g of naphthalene, and the reaction was carried out at 160° C. for 2 hours. Unreacted materials were separated and discharged outside the container under a reduced pressure. Then, 857 g of 35% by weight concentration formalin was added and reacted at 105° C. for 5 hours to obtain a condensation product formed by methylene type bonding of β-naphthalene sulfonic acid. After being neutralized with ammonium water, the condensation product was filtrated to yield a filtrate liquid.

1. customUnreacted materials were separated
2. concentrationThen, 857 g of 35% by weight concentration formalin
3. additionwas added
4. customreacted at 105° C. for 5 hours
5. customto obtain a condensation product