作者: Gabriela Vanessa Pérez , G. Guerra
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摘要: Resumen: Hoy en dia la fermentacion sumergida con Aspergillus niger, que se basa formacion de pellets, constituye uno los metodos mas importantes para obtener acido citrico. En el presente trabajo comprobo morfologia puede controlarse optimizando composicion del medio, pH, tamano inoculo, y velocidad agitacion, es determinante productividad fermentacion. Por esto abordo estudio influencia estas variables, dos partes. La primera parte investigacion, realizo Erlenmeyers 500 ml, donde medio mayor numero pellets menor diametro correspondio a siguiente composicion: Sacarosa, 150g/L; NH4NO3, 2,40 g/L; KH2PO4, 0,919 pH 6,5; inoculo (4,20±0,55)*106 esporas. segunda investigacion consistio un analisis agitacion sobre estabilidad, compactacion, llevo cabo biorreactor modelo MAP-002 Brunswick 2 litros, determino optima llevar escalado partir reactor litros fue 600 rpm. Con las variables operacion asi establecidas, obtuvo protocolo pellet desde escala hasta 14 base resultados experimentales obtenidos una tasa aireacion 0,7 vvm. Para estimar superior formulo matematico, simulacion digital respectiva, manteniendo constante valor coeficiente volumetrico transferencia masa menor, 1,95x10-2 s -1 . Los indicaron debia ser funcion continua tiempo, lo habria necesitado esquema control set-point variable, no disponia, por debio recurrir manual valores constantes escalonados. Las estimadas permitieron escalar obtenido al agitar rango entre 420 380 rpm pudo validar escalado. Abstract: Nowadays Apergillus niger submerged fermentation is one of the most important processes used to synthesize citric acid. This type based on formation and its morphology. The morphology has strong impact productivity Proper values medium composition, size inoculum stirring speed can influence productivity. For this reason influences these were studied in context project, two parts.At first, an analysis above-mentioned was carried out, excepting speed, Erlenmeyer flasks, establishing comprised 150g/L Sucrose; g/L with adjusted value 6,5 inoculated spores obtained greatest amount smallest diameter. Afterwards, stability, compaction, number diameter out 2-liter bioreactor model allowing determination optimal velocity for scaling between 4 liters as With operating thus determined, basis experimental results liter reactor, process from it at aeration rate 0.7 To determinate scale, mathematical developed, simulation constant volumetric coefficient mass transfer , experiments reactor. showed that should be function time, matter which –given fact variable speed controller available- had resolved by manually increasing agitation stepwise. estimated allowed scale means range rpm, obtaining successful