Sodium Hydroxide → 2-Naphthol

Participants

Reaction Steps

Sodium naphthalene-2-sulfonate and a hydrogenated triphenyl mixture were sent to a mixing tank 1 at a rate of 230 kg/hr and 825 kg/hr, respectively, and mixed with stirring. In a dispersing tank 2, 200 kg/hr of a 50% aqueous solution of sodium hydroxide was added to form a dispersed mixture. The dispersed mixture was dehydrated in a dehydrating tank 3, and sent to a reservoir 4. From the reservoir 4, a mixture consisting of sodium naphthalene-2-sulfonate, sodium hydroxide and the hydrogenated triphenyl mixture was sent to a reaction tank 5 at a rate of 1155 kg/hr, and continuously reacted at 310° C. in a nitrogen stream with a residence time of 6 hours. After the reaction, the reaction mixture was cooled in a heat exchanger 6, and sent to a water mixing tank 7 where it was mixed with 1200 liters/hr of water. Then, the reaction medium layer was separated in a separating tank 8, and the aqueous layer was mixed with 3.1 kg/hr of activated carbon in a mixing tank 9. Then, the activated carbon was removed in a filtration device 10. The residue was precipitated with dilute sulfuric acid in an acid precipitation tank 11, and separated by a centrifugal separator 12 to give 137.2 g (yield 95.3%) of 2-naphthol hourly.

Provenance & Evidence