conditions as with caprylic acid, ion Fig. 4 are the concentration cures of the esters are compared. With oleic acid the conversion is the highest and that of enanthic acid is the lowest. The reference concentrations are 0.4 mol l ±1 for enanthic acid and 0.1 mol l ±1 for oleic acid. The recovery of enanthic acid ester could be performed in the same manner as that of caprylic acid ester. The boiling point of the ester is 168 o C and that of acid 205 o C.The recovery of oleic acid and its ethyl ester is only possible with vacuum distillation. The boiling point of oleic acid is at 286 o C at 100 torr and that of the ester at 207 o C at 13 torr.
ConclusionThe first application of the reactive membrane extraction for in situ recovery of the secondary metabolite, penicillin G, from cultivation medium and its conversion to ampicillin through the intermediate stage 6 APA (amino penicillanic acid) was already reported [8].The results of the present investigations indicate that in situ recovery of a primary metabolite, ethanol, by membrane extraction from aqueous phase into an organic phase and its enzymatic conversion to ester is a possible method.Since the carboxylic acid esters are components of aroma and fragrance mixtures, the reactive membrane extraction is more suitable for the production of these esters than for the in situ the recovery of ethanol from cultivation media.
AcknowledgementThe authors gratefully acknowledge the financial support of the European Community (Project No. ERBCIPA CT 923011).
198K a t a l y s e 1567 stabilen und reaktiven Zwischenprodukten, konnten damit bestatigt werden. Eine interessante Moglichkeit fur weitere Untersuchungen besteht nun darin, die enviesenen Vorteile der Schalenkatalysatoren mit den bekannten positiven katalytischen Eigenschaften von Ruthenium-Katalysatoren [2,3] zu koppeln.
Die Autoren danken der Max-Buchner-Forschungsstiftungund dem Fonds der Chemischen Industrie fur die Unterstutzung der Arbeit.
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