Pretreatment and acid hydrolysis of Omani Prosopis Juliflora wood

Mohammad Silwadi , Hasan Mousa , Ahlam Al Azkawi , Fatma Sulaiman Al Kumzary , Tahani Ali Al-Najadi
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引用次数: 1

Abstract

The objective of this research is to investigate different chemical pretreatment methods to reduce the lignin and hemicellulose content of Omani Prosopis Juliflora. The pretreated wood will then be acid hydrolyzed to convert the cellulose content to sugar. Four types of pretreatment methods were employed, namely: Alkaline pretreatment (Method I), Alkaline + Hydrogen peroxide pretreatment (Method II), Alkaline + Hydrogen peroxide + acid-chlorite pretreatment (Method III) and Alkaline + H2O2 + Acid-chlorite + bicarbonate pretreatment (Method IV). The effectiveness of each pretreatment method was assessed by measuring lignin, hemicellulose, and cellulose contents and the crystallinity index (CrI) using X-ray diffraction (XRD) analysis. The results were further assessed by taking images of the wood samples after each pretreatment step using Scanning Electron Microscope (SEM). The results showed that the CrI increased from 51% for the untreated samples to 61%, 65%, 68% and 73.2% after treating with Method I, II, III and IV, respectively. Measuring the cellulose, hemicellulose and lignin contents showed that the effectiveness of the methods in ascending order was Method I < Method II < Method III < Method IV.

The pretreated wood samples by method IV were acid hydrolyzed. The effect of acid type, namely: H2SO4, HNO3, HCl and H3PO4, concentration and hydrolysis time on the %conversion of cellulose to sugar was investigated. The results revealed that H2SO4 was the most effective acid, whereas H3PO4 was the weakest. The efficiency of the tested acids follows the following order: H2SO4 > HNO3 > HCL > H3PO4. For all acids tested, the %conversion of cellulose to reducing sugar as a function of time increases linearly till t = 90 min, after which no change in the %conversion was obtained. Investigating the effect of acid concentration showed that as the concentration increases, the %conversion increases too. Upon increasing acid concentration from 1% to 10%, the %conversion increases from 12% to 62% for H2SO4, from 5% to 43% for HNO3, from 0% to 47% for HCl, and from 5% to 34% for H3PO4.

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阿曼藜木的预处理及酸水解研究
本研究的目的是研究不同的化学预处理方法,以降低阿曼Prosopis Juliflora的木质素和半纤维素含量。然后将预处理过的木材进行酸水解,将纤维素含量转化为糖。采用了四种预处理方法,即:碱性预处理(方法I)、碱性预处理 + 过氧化氢预处理(方法二),碱性 + 过氧化氢 + 酸性亚氯酸盐预处理(方法III)和碱性 + H2O2 + 酸性亚氯酸盐 + 碳酸氢盐预处理(方法IV)。通过使用X射线衍射(XRD)分析测量木质素、半纤维素和纤维素含量以及结晶度指数(CrI)来评估每种预处理方法的有效性。通过使用扫描电子显微镜(SEM)在每个预处理步骤之后拍摄木材样品的图像来进一步评估结果。结果表明,用方法I、II、III和IV处理后,CrI从未处理样品的51%分别提高到61%、65%、68%和73.2%。纤维素、半纤维素和木质素含量的测定表明,这些方法的有效性按升序排列为方法I <; 方法二 <; 方法三 <; 方法四、对经方法四预处理的木材样品进行酸水解。研究了酸的种类,即:H2SO4、HNO3、HCl和H3PO4,浓度和水解时间对纤维素向糖转化率的影响。结果表明,H2SO4是最有效的酸,而H3PO4是最弱的酸。测试酸的效率遵循以下顺序:H2SO4 >; HNO3 >; HCL >; H3PO4.对于所有测试的酸,纤维素转化为还原糖的百分比随时间线性增加,直到t = 90 分钟,之后没有获得%转化率的变化。考察了酸浓度对转化率的影响,发现随着酸浓度的增加,转化率也随之增加。当酸浓度从1%增加到10%时,H2SO4的%转化率从12%增加到62%,HNO3的%转化度从5%增加到43%,HCl的转化率从0%增加到47%,H3PO4的转化率为5%增加到34%。
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来源期刊
Journal of King Saud University, Engineering Sciences
Journal of King Saud University, Engineering Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
12.10
自引率
0.00%
发文量
87
审稿时长
63 days
期刊介绍: Journal of King Saud University - Engineering Sciences (JKSUES) is a peer-reviewed journal published quarterly. It is hosted and published by Elsevier B.V. on behalf of King Saud University. JKSUES is devoted to a wide range of sub-fields in the Engineering Sciences and JKSUES welcome articles of interdisciplinary nature.
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