Succinic anhydride → Succinic Acid

Participants

Reaction Conditions

Reaction Steps

In a 3-L flask equipped with a stirrer, a thermometer and a dehydration tube, 500 g of succinic anhydride, 2,463 g of triethylene glycol monomethyl ether and 9.5 g of paratoluenesulfonic acid monohydrate were charged and the mixture was reacted under reduced pressure of 4 to 10.7 kPa at 110° C. for 15 hours, while blowing nitrogen (500 mL/minute) into the space. The acid value of the reaction solution was 1.6 (KOH mg/g). To the reaction solution, 27 g of an adsorbent Kyoward 500SH (manufactured by Kyowa Chemical Industry Co., Ltd.) was added, stirred at 80° C. at 2.7 kPa for 45 minutes, and filtered. Thereafter, triethylene glycol monomethyl ether was distilled off at a liquid temperature of 115 to 200° C. at a pressure of 0.03 kPa. After cooling to 80° C., the residual liquid was filtered under reduced pressure, to give a diester of succinic acid and triethylene glycol monomethyl ether as a filtrate. The resultant diester had an acid value of 0.2 (KOH mg/g), a saponification value of 276 (KOH mg/g), a hydroxyl value of 1 or less (KOH mg/g) and a hue of APHA200.

Provenance & Evidence