Epichlorohydrin → Diglycidyl ether

Participants

Reaction Conditions

Reaction Steps

In a 750 ml sulfonation flask equipped with thermometer, reflux condenser, N2 inlet and metering device, 90.12 g (1.0 mol) of 1,4-butanediol are added to catalyst B and the reaction mixture is heated to 100° C. With efficient stirring, 160.7 ml (2.05 mol) of epichlorohydrin are added over 1 h and the mixture is allowed to react for 1 h. Afterwards the reaction mixture is cooled to 50° C. and to the solution are added 16 g (0.2 mol) of a 50% aqueous solution of NaOH over 5 min. Then 76 g (1.9 mol) of pulverised NaOH are added by increments over 45 min and the suspension is stirred for 30 min. The reaction mixture is filtered, washed with 100 ml of toluene and the phases are separated. The organic phase is dried over MgSO4, filtered and the filtrate is freed from solvent on a rotary evaporator (bath temperature 70° C.), giving 199.0 g (98% of theory) of colourless diglycidyl ether of 1,4-butanediol having the following properties: epoxy value: 8.64 eq/kg (87% of theory); total chlorine content: 3.4%; concentration of hydrolisable chlorine: 620 ppm.

Provenance & Evidence