Sulfuric Acid → N,N-Diethylglycine

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Powdery solid N,N-diethylglycine sodium salt (produced by Tokyo Kasei Kogyo K.K. Japan) was dissolved in deionized water. The solubility in water of the N,N-diethylglycine sodium salt was 34% by mass (20° C.). To 342 g of this aqueous 34% by mass solution, was added 98% by mass sulfuric acid to adjust the pH to 6.6. This aqueous solution was condensed at 90° C. under a reduced pressure until the N,N-diethylglycine sodium salt concentration in the solution reached 67% by mass. The condensed solution was cooled to 40° C. and was stirred for one hour. The deposited crystalline sodium sulfate was removed at 40° C. by using a Buchner vacuum filter. Thereby, an aqueous 67% by mass solution of N,N-diethylglycine was obtained in an amount of 125 g. The aqueous N,N-diethylglycine solution contained sodium sulfate at a concentration of 0.9% by mass.

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