REGENERATION OF IONIC LIQUIDS DURING THE PRECIPITATION OF 2-NAPHTHALENESULFONIC ACID FROM AQUEOUS SOLUTION

Abstract

In the first step, 2-naphthalenesulfonic acid was synthesized and the efficiency of the isolation process was found around 70 %. Diluted sulfuric acid saturated with organic residues (waste water) obtained as filtrate was neutralized and treated by ionic liquid. The commercialy available ionic liquid – benzalkonium chloride was successfully tested for removal of rests of 2-naphthalenesulfonic acid from aqueous solution. The removal efficiency of 2-naphthalenesulfonic acid using BAC was 85 % over 3 h. In the next step, the ionic liquid and naphtalene were recycled by hydrolysis. The recycled benzalkonium sulfate was farther reused for treatment of filtrates from next sulfonation step.