Stock analysis of additives synthesis via vapor-phase chromatography containing liquid crystals

Via vapor-phase chromatography 2-tiophentiol and the mixtures of individual xanthogenates, which are the stock of additive synthesis have been analyzed. Isomeric composition of high boiling aromatic hydrocarbons has been separated through vapor-phase chromatography. n,nꞌ-dyetoxiazoxybenzol and dygeptylphenyl ethers of phenyldicarbon acids, which are applied to the glass capillary columns have been used as a liquid stationary phase. The water vapor of moving carrier was used instead of the gas-carrier of nitrogen, which allowed to reduce the durability of the analysis and to improve the seperation efficiency. The main parameters of vapor-phase chromatography have been studied during the stock analysis as well. The retention time, the height of theoretic trays and rates of assimetry of analyzed compounds have been calculated.

Short Glass Micro-Packed Columns for Gas Chromatography

For a quick analysis of simple mixtures of lower chlorinated hydrocarbons a possible application has been studied of short glass micro-packed columns packed with commercial sorbents for extraction by solid phase. For analyses of lower alcohols, carboxylic acids, and other oxygen-containing substances the columns were packed with the organic porous sorbent, a copolymer of divinylbenzene and 1,4-di(methacryloyloxymethyl)naphthalene. The chosen sorbents were placed into glass capillary columns of 0.4 - 0.7 m length and 0.7 mm i.d. As the sorbent amount in the column is small, the columns are cheap. Whenever necessary, they can be prepared in any laboratory. The analyses of simple mixtures of above-mentioned classes of compounds lasted from 90 to 270 s.