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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   winter 2019 , Volume 33 , Number 4 (65) ; Page(s) 553 To 563.

Control of inhibitory compounds in the bio-refinery of bagasse pith

* Dept. of Bio Refinery, Shahid Beheshti University, Zirab Campus, Savadkooh, Mazandaran, Iran
In the present study, in order to control the inhibitory compounds in the bio-refinery, bagasse pith was pretreated under acidic hydrolysis with % 8 dilute sulfuric acid, for 90 minutes at 120 ° C. Then, by using de-depleting methods of annealing, activated carbon and combining the above mentioned methods, removal of deterrent compounds from the hydrolyzates obtained from this pretreatment was performed. In the method of overlimming, calcium hydroxide and sulfuric acid, in activated carbon method, activated carbon was used at three levels (0. 5, 1. 5 and 2. 5%) and in the combined method of the combination of materials in the two previous methods Became After acid treatments and each of the methods of insemination, the amount of recovered sugars and the values of the inhibitory compounds of furfural and hydroxymethylfurfural in the hydrolyzate were measured as two important indicators. The results showed that application of the above methods on hydrolyzate increased the yield of reduced sugars, so that the highest sugar yield (more than 32%) was obtained after the independent method of overlimming. In addition, active and combined carbon autonomous methods (overlimming and activated carbon) have an optimum activated carbon consumption of 2. 5% and 1. 5, respectively. The qualitative study of the presence of inhibitory agents in hydrolyzates showed that furfural and hydroxymethylfurfural have maximum absorption at wavelengths of 276 and 282 nm. Also, an overlaying method with 2. 5% activated carbon as the best method could eliminate up to 100% of inhibitory compounds. On the other hand, the autonomous method of overlimming, with the removal of more than 90% of the inhibitory compounds, also has the highest sugar yield. Therefore, taking into account simultaneously the rate of sugar yield and the elimination of deterrent compounds, two independent alternatives of Overlimming and Overlimming in combination with 2. 5% active carbon could be proposed for the production of bioassays, such as bioethanol, xylitol, and. . . from the pith of bagasse.
Keyword(s): Biorefinery,bagasse pith,inhibitors,furfural,Hydroxymethylfurfural,acid hydrolysis
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