| 摘要 |
PURPOSE:To prepare the titled substance in high yield, without using organic solvent, by using a hydroxyl compound, a halogenocarboxylic acid and an alkali as raw materials, mixing the hydroxyl compound with the other components in the state of aqueous solution, and heating the whole components while removing water from the system. CONSTITUTION:The titled compound useful as a sequestering agent is prepared by the thermal reaction of a hydroxyl compound with a halogenocarboxylic acid in the presence of a stoichiometric amount of an alkali necessary for the condensation reaction. In the above process, a hydroxycarboxylic acid such as glycolic acid, lactic acid, etc. is used as the hydroxyl compound and is mixed with at least one of the other reaction components prior to the reaction in the state of aqueous solution. The amount of water is 1-3pts.wt. per 1pt.wt. of the sum of the reaction components. Thereafter, the above three components are heated while removing water from the system to effect the etherification reaction. The reaction temperature is >=100 deg.C under normal pressure.
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