IP 369: Determination of composition of oil soluble petroleum sulphonates - Liquid chromatography method

Overview:

Scope

This method covers the analysis of refined and crude natural and synthetic oil-soluble sulphonate products. Resins, if present, are recovered with the oil phase and carboxylates are recovered as sulphonates.
This method covers the determination of mineral oil, sodium sulphonate, inorganic salts, water, basicity or acidity, average molecular weight, and relative density of sodium sulphonate products.

NOTE 1: Methods for the analysis of sodium sulphonates are described in ASTM Method D855, Analysis of Oil-Soluble Sodium Petroleum Sulphonates and ASTM Method D2548, Analysis of Oil-Soluble Petroleum Sulphonates by Liquid Chromatography.

This method covers the determination of mineral oil, sulphonate, water, total base number, average molecular weight, and relative density of calcium, barium, magnesium, and ammonium sulphonate products.

NOTE 2: Methods for the analysis of calcium and barium sulphonates are described in ASTM Method D2894, Analysis of Calcium and Barium Petroleum Sulphonates by Liquid Chromatography.