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EN
Preliminary steps were reported of optimization of catalytic amination of 1-(2,6-dimethylophenoxy)-2-propanol in our new synthesis of 1-(2,6-dimethylphenoxy)-2-aminopropane (mexiletine). In our search for optimal conditions a series of experiments were performed based on the concept of fractional factorial design. A detailed statistical analysis of reaction responses indicated necessary modifications of the synthesis. Elevated temperatures and the use of a more efficient catalyst were found necessary in order to use direct amination in industrial synthesis of pharmaceutically important amine from commercially available alcohol.
EN
Reducing yarn hairiness during yarn winding by the use of air jets is a new approach, since the production rate of winding is very high and the process itself increases yarn hairiness. The Box & Behnken factorial design approach has been used to optimise the jet angle, the jet diameter, yarn linear density and the winding speed in order to reduce the yarn hairiness. A jet angle of 450, a jet diameter of 2.2 mm, 10 tex yarn and a winding speed of 800 m/min give the optimal results in terms of reducing the hairiness. A CFD (computational fluid dynamics) model has been developed to simulate the airflow pattern inside the jets with the use of Fluent 6.1 software. The air velocity around the core of the jet is the influencing factor in wrapping the hairs on the yarn body.
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