Production of quality grade ethanol from sweet sorghum

Date

2017

Abstract

This research standardizes the fundamental processes of sweet sorghum juice clarification, storage and fermentation by establishing the operating conditions on each process. The optimum conditions for the whole clarification study were found at 90 deg C, pH8, and 7 ppm polycationic flocculant solution. In the case of storage stability of sweet sorghum juice, it was found out that clarification was not an efficient way of preserving the juice the highest amount of glucose was not an efficient way of preserving the juice. The highest amount of glucose was not an efficient way of preserving the juice. The highest amount of glucose content detected or can be recovered that we can still consider the juice as stable was 52.79 mg glucose/mL from the sample treated with sorbic acid at 1000 ppm stored in a PET bottle under 4 deg C. The final pH and deg Brix that correspond to this sample were 4.700 and 10.40, respectively. The stability f sweet sorghum syrup was also assessed by storing the samples for four months. With the end-of-storage-period reducing sugar (RS) concentration as the basis for the most favorable storage conditions, it was concluded that an initial concentration of 65 deg Brix, storage temperature of 40 deg C, and HDPE as the material of construction of the storage container were the most favorable conditions, with an average RS of 558.98 mg/mL. This value was higher compared with the 113.97 mg/mL obtained from storage storability study of syrup production for storability purposes. A comparative run with flask fermentation was conducted using the best conditions of ethanol fermentation in the reactor. A clarified 20 deg Brix syrup with pH of 4 was subjected to sterile fermentation 30 deg C reaction temperature wit h 30% inoculums loading. An alteration was also done with the agitation to sustain the power number as well as how the mixture is homogeneously mixed. Through these runs, an average ethanol concentration of 9.82% v/v was attained.

Language

English

Document Type

Article

Pages /Collation

135 leaves

En – AGROVOC descriptors

SORGHUM BICOLOR; FERMENTATION; STORAGE; ETHANOL; CARBOHYDRATE CONTENT; PROCESSING

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