Process for producing cyclic formal

摘要

In producing a cyclic formal by feeding an alkylene glycol and a formaldehyde derivative as starting materials to a reaction vessel and reacting them in the presence of a catalyst, the value of amount of alkylene glycol (mole)/amount of formaldehyde derivative in terms of formaldehyde (mole) is kept at 0.02-0.95 at the time of feeding of the starting materials and at 1.05-50 at the time of reaction of the starting materials. According to this process, the amount of by-product impurities at the reaction step can be reduced, and an additional purification step of the cyclic formal is not needed or can be easily performed.