Determination of DMO Heavy Component and Its Impurities by Gas Chromatography
A method for determining the composition and impurity levels of DMO(dimethyl oxalate)was developed.DMO is a byproduct of coal-to-ethylene glycol technology and has low boiling and melting points in different organic solvents.It crystallizes below 56℃.A ShimCap-InoWax capillary column and FID hydrogen flame ionization detector were used,and the DMO heavy component and its impurities were successfully separated under the optimized chromatographic conditions,and good detection results were obtained.The results showed that,under the selected chromatographic conditions,there was a linear correlation between the mass fraction of DMO and the measurement results within the range of 0 to 99.916%.For the two common impurities,DMC(dimethyl carbonate)and methanol,good linear relationships were also observed with measurement ranges of 0 to 0.20%and 0 to 0.65%,respectively.In the spiked recovery experiments,the recovery rates of DMO ranged from 99.00%to 101.23%,with a coefficient of variation of 0.57%.For DMC and methanol,the recovery rates ranged from 97.83%to 106.01%and 97.85%to 102.64%,respectively,with coefficients of variation of 1.05%and 0.82%.This method has achieved satisfactory results in determining the composition and impurity levels of DMO.
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