Process of producing dioxane glycol
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorsIkutaro Kuzuhara, Yutaka Nakamura
Life of this patent
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Abstract
A production method of 2-(5-ethyl-5-hydroxymethyl-1,3-dioxane-2-yl)-2-methylpropane-1-ol (DOG) which includes a step of acetalizing hydroxypivalaldehyde with trimethylolpropane in a solvent in the presence of an acid catalyst. After the acetalization, the reaction product liquid is neutralized and then heated to dissolve the deposited DOG crystals. Then, the reaction product liquid is cooled to recrystallize DOG. DOG produced in such manner has an adequately large particle size. Therefore, DOG is easy to handle and involves little danger of dust explosion.
Claims11
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:
- X(% by weight)=B/A×100
- 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.
Dependencies are inferred from the claim text.