Optimizing Dilute-acid Hydrolysis (DACH) of Distillers Grains and Ethanol Fermentation

Abstract

Distillers grain (DG) is an abundant and low-cost lignocellulosic biomass. The objective of paper is to compare the influence of different acids on hydrolysis of DG and select the best acid. The results indicate that sulfuric acid is the most effective acid, and the optimum hydrolysis conditions are temperature 100°C, sulfuric acid concentration 2.0%, solid-liquid rate 1:12 (w/v), time 3.0 h. Under these conditions, the concentration of reducing sugar (RS) and xylose are 43.69 g/L and 35.16 g/L, respectively. The bioethanol production is around 11.82 g/L, which corresponds to 77.12% of theoretical yield and 0.14 g/g of consumed sugar.

Fermentable Sugar via Diluted Acid Hydrolysis of Sugarcane Bagasse

“…Thus, an increase in the temperature will increase the hydrolytic rate. This finding agreed well with a study conducted by Ren et al, [13] which reported an increase in the glucose yield with the temperature for the hydrolysis of distiller grains.…”