Abstract: In a method of producing a dialdehyde monoacetal(s) (III) from dialdehyde(s) (I) and diol(s) (II), the present invention provides a method comprising a first step wherein said dialdehyde(s) (I) and said diol(s) (II) are reacted to produce dialdehyde bisacetal(s) (IV), the amount by mole of said diol(s) (II) being at least twice the amount by mole of said dialdehyde (I) and a second step wherein said dialdehyde bisacetal(s) (IV) is reacted with said dialdehyde (I). The present invention also provides a method of producing a glutaraldehyde monoacetal via reacting 2-Y-3, 4-dihydro-2H-pyran or a ring-substituted derivative thereof with diol. This method comprises a second step reaction wherein glutaraldehyde (iv) which is one of the by-products of the first step reaction is reacted with glutaraldehyde bisacetal (v) which is another by-product of said first reaction.

Abstract: Disclosed is an improved process for the refinement of isopropyl acetate, whereby there can be effectively prepared isopropyl acetate having a high purity of, for example, approximately 99.9%, in which a distillate fraction having a carbon number of 3 obtained by catalytically cracking petroleums such as naphtha or a crude propylene by-produced in a process for the preparation of isobutene by the dehydrogenation of isobutane.