2989. Diamyl Sodium Sulfosuccinate

Nomenclature

CAS number: 922-80-5
Sulfobutanedioic acid 1,4-dipentyl ester sodium salt; sulfosuccinic acid dipentyl ester sodium salt; Aerosol AY; Alphasol AY.
C14H25NaO7S; mol wt 360.40.
C 46.66%, H 6.99%, Na 6.38%, O 31.08%, S 8.90%.

Description and references

The amyl or 1-methylbutyl diester of the monosodium salt of sulfosuccinic acid or a mixture of both. Wetting agent prepd by the action of the appropriate alcohols on maleic anhydride followed by addtion of sodium bisulfite: Jaeger, US 2028091 and US 2176423 (1936, 1939 to Am. Cyanamid).

Chemical structure

Properties

Available as a mixture of white, hard pellets and powder. Soly in water at 25° = 392 g/liter; at 70° = 502 g/liter. Maximum concn of electrolyte soln in which 1% of the wetting agent is sol: 3% NaCl; 2-4% NH4Cl (turbid); 3-6% (NH4)2HPO4 (turbid); 4% NaNO3 (slightly turbid); 15% Na2SO4 (very slightly turbid). Also sol in pine oil, oleic acid, acetone, hot kerosene, carbon tetrachloride, glycerol, hot olive oil; insol in liquid petrolatum. Surface tension in water: 0.001% = 69.4 dyn/cm; 0.02% = 68.3 dyn/cm; 0.1% = 50.2 dyn/cm; 0.25% = 41.6 dyn/cm; 1% = 29.2 dyn/cm. Interfacial tension 1% in water vs. liquid petrolatum: 5 seconds = 7.55 dyn/cm; 30 seconds = 7.37 dyn/cm; 15 minutes = 7.03 dyn/cm. Interfacial tension 0.1% in water vs. liquid petrolatum: 5 seconds = 29.5 dyn/cm; 30 seconds = 28.6 dyn/cm; 15 minutes = 27.5 dyn/cm. Stable in acid and neutral solns, hydrolyzes in alkaline solns.

Use

As emulsifier in emulsion polymerization and as a wetting agent.