Patent ID: 7456300
Filing Date: 2008-11-25
Classification: C07D

Abstract:
1. A process of producing a dioxane glycol represented by the following formula I: which comprises a step of allowing hydroxypivalaldehyde represented by the following formula II: to react with trimethylolpropane represented by the following formula III: in water in the presence of an acid catalyst, the reaction of hydroxypivalaldehyde and trimethylolpropane being performed under conditions which meet the following requirements: (A) a total amount of amines and/or amine salts in hydroxypivalaldehyde is 1.5% by weight or less; (B) the reaction is performed at from 65 to 80° C.; (C) pH of a reaction system is kept within a range of from 0.1 to 4.0 during the reaction; (D) X represented by the following formula IV: wherein A is a total weight of hydroxypivalaldehyde, trimethylolpropane, water and the acid catalyst which are supplied to the reaction system, and B is a theoretical amount of the dioxane glycol to be produced from hydroxypivalaldehyde and trimethylolpropane which are supplied to the reaction system, is from 3 to 35% by weight; and (E) a solid or solution of at least one of trimethylolpropane and hydroxypivalaldehyde is added to (a) at least one of hydroxypivalaldehyde and trimethylolpropane, (b) water and (c) the acid catalyst in a reaction vessel over a time period of 0.5 to 24 h.