GAS CHROMATOGRAPHIC ANALYSIS OF THE DEHYDRATION SYSTEM OF METHYL LACTATE FOR ITS METHYL ACRYLATE CONTENT

Gas chromatography was used for the determination of methyl acrylate in the reaction medium where it was produced by dehydration of methyl lactate.The solution sample was diluted with ether,separated on the denatured polyethylene glycol FFAP capillary column and determined by FID detection.The quantitative determination was performed by the internal standard calibration curve using ethyl acrylate as internal standard.Under the chromatographic condition proposed,linear relationship between the values of ratio of peak area of methyl acrylate to the internal standard and concentration of methyl acrylate was obtained in the range of 0-53 mg·L-1 with a correlation coefficient of 0.999 4.Detection limit of the method was found to be 0.001 5 mg·L-1 (S/N=2).In the application of the proposed method to the analysis of 3 samples,RSD′s (n=7) of the results obtained were in the range of 1.55%-3.12%,and the recovery found by standard addition method were in the range of 96.8%-99.0%.