Patent ID: 7402685
Filing Date: 2008-07-22
Classification: C07D

Abstract:
1. A process of producing a dioxane glycol represented by the following formula I: which comprises: (1) a step of allowing hydroxypivalaldehyde represented by the following formula II: to react with trimethylolpropane represented by the following formula III: in a solvent in the presence of an acid catalyst, thereby obtaining a reaction product liquid containing the dioxane glycol of the formula I; (2) a step of neutralizing the reaction product liquid; (3) a step of heating the reaction product liquid after the neutralization to 70° C. or higher, thereby completely or partly dissolving crystals of the dioxane glycol; and (4) a step of cooling the reaction product liquid after the heating to 60° C. or lower, thereby allowing the dissolved dioxane glycol to recrystallize; while regulating X represented by the following formula: wherein A is a total weight of the reaction product liquid obtained in the step 1 and B is a theoretical amount of the dioxane glycol to be produced from hydroxypivalaldehyde and trimethylolpropane which are introduced into a reaction system, within a range of from 3 to 35% by weight.