Yield:-

Reaction Conditions:

with sodium disulfite in water at 104; for 3.16667 h;Inert atmosphere;

Steps:

1

Example 1 (Comparison)Production of Sodium di-(2-ethylhexyl)-sulfosuccinate (Solution in Water/Ethanol)556 g (1.63 mol) di-(2-ethylhexyl)-maleate, 40 g Hydropalat 875, 160 g (0.84 mol) sodium disulfite and 194 g deionized water were introduced into a 1-liter four-necked flask equipped with a mechanical stirrer, heating system, reflux condenser and nitrogen inlet and were heated under reflux at 104° C. in a gentle stream of nitrogen until a clear solution was obtained (ca. 3 hours). After stirring for 10 minutes, no more sulfite could be detected in the product. On cooling, the product gelled/solidified which could be avoided by addition of a co-solvent: to this end, 50 g ethanol was added at ca. 80° C. The solution thus obtained contained 75% by weight sulfosuccinate and had the following characteristic data: Epton: 16.39%; dry residue: 74.29%.

References:

US7981932,2011,B2 Location in patent:Page/Page column 4