Solubilities of 2-naphthalenesulfonic acid monohydrate and sodium 2-naphthalenesulfonate in sulfuric acid solution and their application for preparing sodium 2-naphthalenesulfonate

Abstract

The solubilities of 2-naphthalenesulfonic acid monohydrate and sodium 2-naphthalenesulfonate in sulfuric acid solutions were measured at temperatures ranging from 278.15 to 338.15 K by using a dynamic method. The concentration of sulfuric acid solution ranged from 0 to 80wt%,. The solubilities of 2-naphthalenesulfonic acid monohydrate and sodium 2-naphthalenesulfonate increased with temperature, and both of them were the lowest at 70wt%, of sulfuric acid solution(w ₃ ⁰ =0.70)while the highest in pure water. The solubility data were correlated by the modified Apelblat equation. Based on the solubility difference between 2-naphthalenesulfonic acid monohydrate and sodium 2-naphthalenesulfonate, a new technique in which sodium sulfate was used to replace sodium sulfite in the neutralization reaction was developed. The suitable mole ratio of H₂O to Na₂SO₄ in the neutralization reaction was 80:1, and that of 2-naphthalenesulfonic acid monohydrate to Na₂SO₄ was 3.2:1. The material balance under the suitable mole ratios was given and discussed.

Keywords

2-naphthalenesulfonic acid monohydrate / sodium 2-naphthalenesulfonate / solubility / modified Apelblat equation / sodium sulfate

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