Glucose and Valuable Chemicals Production from Cotton Waste Using Hydrothermal Method
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Direct hydrolysis of a towel to glucose was investigated using steam explosion and microwave-assisted treatment to find effective uses for cotton waste. The maximum glucose yield by direct hydrolysis (based on an untreated towel) was 18.8%, obtained at a steam pressure of 5.5 MPa (at 271 °C) and steaming time of 5 min using steam explosion. For the microwave-assisted treatment, with a 1.0 (w/w)% sulfuric acid catalyst, the maximum glucose yield by direct hydrolysis was 28.9%, obtained at a microwave heating temperature of 200 °C for 7 min. The maximum total glucose yield (from both direct hydrolysis and enzymatic hydrolysis of treated residue) was 78.0%, attained at a microwave heating temperature of 200 °C for 7 min with 0.5 (w/w)% sulfuric acid catalyst. Furthermore, the maximum total glucose and valuable water soluble chemicals (cellobiose, 5-hydroxymethylfurfural, formic acid, and levulinic acid), 94.1%, were achieved at heating temperature of 200 °C for 10 min with 0.5 (w/w)% sulfuric acid catalyst. Finally, ethanol, 84.5% of conversion rate, could be produced using supernatant (it contained glucose) and microwave treated residue (200 °C for 7 min with 0.25 (w/w)% sulfuric acid catalyst) as carbon source for Saccharomyces cerevisiae with less fermentation inhibition.
KeywordsGlucose Hydrolysis Microwave Ethanol fermentation
The authors thank Dr. Shinagawa (Bioacademia Co. Ltd., Japan) for providing S. cerevisiae BA11. Part of this work was financially supported by MAYEKAWA HOUONKAI FAUNDATION and a Grant-in-Aid for Scientific Research (C) (No. 17K00669) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
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