engleski

Alcohol dehydrogenase catalyzed hexanol oxidation in microreactor

Alcohol dehydrogenaze catalyzed hexanol oxidation was carried out in continuously operated tubular glass microreactors with two inflows (“Y”-shape) and one outflow. A microreactors and a micoreactor equipped with micromixes were used and results were compared. Conversion of 13.5 % was achieved in a “Y”-shaped tubular microreactor without internal mixers and at residence time of 72 s and ten fold lower initial concentration of enzyme and coenzyme, which was significant improvement in comparison with results obtained in conventional macro-scale batch macroreactor (conversion of 5.3 % after 180 s). Introducing two immiscible liquids in “Y”-shaped microreactor and superficial velocity in the range 5 – 200 μL min-1 at 25 °C slug (plug) flow was developed. In order to analyze influence of flow patterns and interphase area, ADH catalyzed hexanol oxidation was performed in microreactor equipped with micromixers. Due to the mixing effect, smaller slugs were developed in microreactor equipped with micromixers comparing to those formed in “Y”- shaped tubular microreactor at the same flow rates. Comparing conversions achieved in both types of the microreactors for the same residence times higher conversions were observed in microreactor equipped with micromixers indicating that mixing of phases has a great effect on mass transfer.

microreactor; multiphase flow; hexanol oxidation; alcohol dehydrogenase

Ovaj se tekst temelji na radu koji je financirala Nacionalna zaklada za znanost, visoko školstvo i tehnologijski razvoj Republike Hrvatske