At Akzo Nobels Functional Chemicals NaMCA-production site in Skoghall, Sweden, there is a stock of contaminated NaMCA desirable to purify. One alternative would be to react NaMCA to another compond. Glycolide, 1,4-dioxan-2,5-dione, is a desirable product to prepare from NaMCA. The glycolide can be used as monomer to produce biodegradable polymers, polyglycolides, with a wide range of use. Lactolide, 3,6-dimetyl-1,4-dioxan-2,5-dione, prepared from lactic acid is stable in an aquatic solution at elevated temperatures and the glycolide is also supposed to be stable in a hot water solution. Experiments with contaminated NaMCA in boiling NaOH-solution produce a NMR spectra with two peaks; 3.65 and 3.75 ppm respectively. The peaks are assumed to be an oligomere (3.65 ppm) and a glycolide dimer (3.75 ppm). When the polymere mixture is left at room temperature, it is degraded to glycolic acid. Separation of glycolide from water was not successful