Method for producing diol having cyclic acetal skeleton
AssigneeMitsubishi Gas Chemical Company, Inc.
InventorMasahiro YAMANE
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Abstract
The present invention provides a method for producing a diol having a cyclic acetal skeleton, in which the method include an acetalization reaction step of obtaining a diol having a cyclic acetal skeleton by subjecting raw material hydroxypivalaldehyde and at least pentaerythritol and/or trimethylolpropane to an acetalization reaction under an acid catalyst and the raw material hydroxypivalaldehyde can contain a prescribed amount of at least one impurity selected from the group consisting of formaldehyde, neopentyl glycol, an ester compound having a neopentyl glycol skeleton represented by formula (III), and isobutyraldehyde.
Claims9
A method for producing a diol having a cyclic acetal skeleton, the method comprising:
- conducting an acetalization reaction of a raw material hydroxypivalaldehyde and at least pentaerythritol and/or trimethylolpropane under an acid catalyst to obtain the diol,
- wherein the raw material hydroxypivalaldehyde comprises an impurity selected from the group consisting of formaldehyde, neopentyl glycol, isobutyraldehyde and an ester compound having a neopentyl glycol skeleton of formula (III);
- wherein R represents a hydrocarbon group having 1 to 4 carbon atoms, a hydrocarbon group having a hydroxy group and having 1 to 4 carbon atoms, or a hydrogen atom, and
- wherein when the impurity comprises the formaldehyde, a content of the formaldehyde is 0.80% by mass or less;
- when the impurity comprises the neopentyl glycol and/or the ester compound, a total molar concentration of the neopentyl glycol and/or the ester compound is 0.100 mol/kg or less;
- and
- when the impurity comprises the isobutyraldehyde, a content of the isobutyraldehyde is 0.05% by mass or less,
- all based on 100% by mass of the raw material hydroxypivalaldehyde.
Dependencies are inferred from the claim text.