http://hdl.handle.net/123456789/3369 2026-05-14T12:00:31Z 2026-05-14T12:00:31Z Prakoso, N.C. Purwono, S. Rochmadi http://hdl.handle.net/123456789/2861 2017-08-10T08:54:24Z 2017-03-01T00:00:00Z

Synthesis of sodium lignosulphonate from oil palm empty fruit bunches’s lignin Prakoso, N.C.; Purwono, S.; Rochmadi Synthesis of sodium lignosulphonate have been done by using batch method. Optimation of synthesis method was achieved through this study. The study was conducted on the optimation of mass ratio of lignin to the NaHSO3 solution, the concentration of NaHSO3 solution, reaction temperature, and reaction time. Of all the treatments, it was found that the optimum mass ratio of lignin to the NaHSO3 solution, concentration of NaHSO3 solution, reaction temperature, and reaction time respectively, 0.3 M, 0.1 M 97 °C, and the reaction was carried out for 4 hours. Excellent yields and selective products were obtained (90-92%)

2017-03-01T00:00:00Z Nugraha, Jaka Fatimah, Is http://hdl.handle.net/123456789/2815 2017-08-11T01:30:14Z 2017-03-18T00:00:00Z

Control of wastewater using multivariate control chart Nugraha, Jaka; Fatimah, Is Sugarcane bagasse (SCB) is most abundant agricultural wastes in the world. It is an attractive feedstock for the large-scale biological production of bioethanol. However, the limitation in bagase use is its high degree of complexity because of its mixed composition of extremely inhomogeneous fibers. Therefore, ethanol production from bagase is often complex, with three main steps, i.e pretreatment, sacharification, and fermentation. Here we used alkali pretreatment using delignification reactor with NaOH 1N and 1.5 bar for 2 hours. Followed by Simultaneous Sacarification and Fermentation (SSF) using Saccharomyces cerevisiae in addition of cellulase and β-glucosidase enzyme. We found that the alkaline pretreatment can decrease cellulose crystallinity, decrease lignin content up to 84.83% and increased cellulose content up to 74.29%. SSF using cellulase enzymes and combination of cellulase enzymes and β-glucosidase derived bioethanol levels respectively 5.87±0.78% and 6.83±0.07%. In conclusion these results strongly suggest that addition of β-glucosidase enzyme on alkali-pretreated bagasse increased the bioethanol production.

2017-03-18T00:00:00Z