The high pressure extraction of crude montan wax was investigated at 20 to 100°C and at 150 to 500 bar with CO2 and ethylene and also with the fluorinated hydrocarbons Frigen 13, 13 B1 and 23. – In some cases the acid numbers, saponification numbers and setting points of the extracts differed markedly from those of the starting material. Especially at low extraction temperatures and pressures, where however solubilities are relatively low mainly low‐molecular weight wax components, such as free wax acids, wax alcohols and paraffins, as well as low‐molecular weight resin components were extracted. The corresponding high‐molecular weight components remain preferentially in the extraction residues.
SummaryAn electronic gas-flow controller system called Advanced Flow Control (AFC), which controls not only carrier gas pressure at the column inlet but also the tutal gas flow including the split flow, was designed and evaluated. BASIC programming of repetitive analyses of standard mixtures under varied split ratios and pressure programs allowed automated optimization of those conditions for the desired column loading and resolution between adjacent peaks.
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