Reaction #362820

Reaction equation

sulfuric acid

naphthalene

→

β-naphthalene sulfonic acid

Conditions

Workup

1. 1
   OtherUnreacted materials were separated
2. 2
   ConcentrationThen, 857 g of 35% by weight concentration formalin
3. 3
   workup.ADDITIONwas added
4. 4
   Otherreacted at 105° C. for 5 hours
5. 5
   Otherto obtain a condensation product

Procedure

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.

Source