Sulfite → HCID 87353620, compound

Participants

Reaction Conditions

Reaction Steps

574 g (1.45 mol) di-(2-propylheptyl)-maleate (produced in accordance with Example 2), 40 g of a solution of (a) 70% di-(2-propylheptyl)-sulfosuccinate, (b) 20% water and (c) 10% ethanol (note—the solution of the three components (a), (b) and (c) is obtained as the product of the described synthesis of Example 3. When Example 3 was carried out for the first time, the mixture of components (a), (b) and (c) was not yet available—40.0 g Hydropalat 875 were used instead), 142 g (0.75 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 product thus obtained had the following characteristic data: acid value 0.18 mg KOH/g; Epton: 14.01%; dry residue: 71.66%; sodium sulfate content 0.32%.

Provenance & Evidence