About the article
A.A. Kuragin, A.I. Pichugina, E.I. Laguseva, A.V. Starovoytov, K.V. Chalov, V.Yu. Doluda
The article presents the results of developing a chromatographic method for analytical monitoring of reaction products for obtaining formaldehyde by transforming carbon dioxide. The research was carried out using a Crystallux-4000M gas chromatograph with a 5 m long, 2 mm internal diameter, packed column filled with MN-270 sorbent with a fraction of 70–120 μm. It was shown that the composition of the gas phase of the reaction medium includes hydrogen, methane, carbon monoxide and dioxide, formaldehyde, methanol, dimethyl ether, methylal, and trioxane. The influence of temperature and the linear velocity of the carrier gas on the efficiency of the analysis and the yield time of the components was determined. An increase in the column temperature leads to a decrease in the analysis time from 15 to 10 minutes, as well as to a decrease in the selectivity of the separation of chromatographic peaks. The linear velocity of the carrier gas also has a significant effect on the efficiency of separation of the components of the analyzed mixture, with the maximum separation factors of the chromatographic peaks being achieved at 0,25–0,28 cm/min. Based on the results of the studies, it can be concluded that it is necessary to use a temperature programming mode to ensure high selectivity in the separation of individual substances.
formaldehyde, chromatography, analysis, analysis conditions, temperature, linear velocity, separation selectivity.