Process for producing glyceryl ether

The present invention relates to a method for producing a glyceryl ether, wherein: the water and the compound of formula (I) is fed to the reactor, the water in the subcritical state or supercritical state conditions, water was added to the compound decomposition reaction, (wherein, R represents a part or all of hydrogen atoms may be hydrocarbon carbon atoms optionally substituted with 1 to 20 fluorine, OA represents the same or different carbon atoms of oxyalkylene group having 2 to 4, p is expressed and then supplied to the reactor after the decomposition reaction of the water was added a mixture of recycled water, adjusting the pH of the water to 3.5 or more after the reactor; or step (: number of 0 to 20) the production method of the glyceryl ether comprising the steps of: (1) 2): the reaction mixture of water recovered from the decomposition reaction with water filtration treatment with a reverse osmosis membrane, and to the resulting treated water is supplied to the reactor as recycle water.