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Mild oxidation of Xiaolongtan lignite in aqueous hydrogen peroxide-acetic anhydride

机译：小龙潭褐煤在过氧化氢-乙酸酐水溶液中的轻度氧化

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摘要

Xiaolongtan lignite (XL) was subjected to the mild oxidation with aqueous hydrogen peroxide-acetic anhydride (AAH) under different conditions, including temperature, the amount of AAH, and time. Each reaction mixture was separated by filtration and subsequent treatments, including extraction with ethyl acetate (EA), to afford the EA-extractable portion (EAEP), which was analyzed with a gas chromatograph/mass spectrometer. The optimal conditions were determined to be 2 mL AAH, 50 degrees C, and 9 h for the oxidation of 0.1 g XL, based on the yields and product distributions of the EAEPs. In total, 47 carboxylic acids (CAs) were detected in the EAEPs under optimized conditions and aliphatic acids are the predominant species. Malonic and succinic acids account for more than 41% of all the CAs, suggesting that dominant linkages connecting aromatic rings (ARs) are -CH2- and -CH2CH2- along with less amounts of polymethylene linkages such as -(CH2)(n)-(n = 3-7). Meanwhile, naphthalenecarboxylic acids and aliphatic linkages connecting three ARs are speculated to exist in XL. The investigation provides an effective approach for understanding the structural features of lignites and obtaining aliphatic acids, especially malonic and succinic acids. (C) 2014 Elsevier Ltd. All rights reserved.
机译：将小龙潭褐煤（XL）在温度，AAH量和时间等不同条件下，用过氧化氢-乙酸酐水溶液（AAH）进行轻度氧化。每种反应混合物通过过滤和随后的处理进行分离，包括用乙酸乙酯（EA）萃取，得到EA可萃取部分（EAEP），将其用气相色谱仪/质谱仪分析。根据EAEP的收率和产物分布，确定最佳条件为2 mL AAH，50摄氏度和9 h氧化0.1 g XL。在最佳条件下，EAEP中总共检测到47种羧酸（CA），其中脂肪酸以脂肪酸为主。丙二酸和琥珀酸占所有CA的41％以上，表明连接芳环（AR）的主要键为-CH2-和-CH2CH2-，以及数量较少的多亚甲基键，例如-（CH2）（n）- （n = 3-7）。同时，推测在XL中存在连接三个AR的萘甲酸和脂族键。该研究为理解褐煤的结构特征和获得脂族酸，特别是丙二酸和琥珀酸提供了一种有效的方法。 （C）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2015年第15期|268-273|共6页
  • 作者

    Liu Jing; Wei Xian-Yong; Wang Yu-Gao; Zhang Dong-Dong; Wang Tie-Min; Lv Jing-Hui; Gui Juan; Qu Meng; Zong Zhi-Min;

  • 作者单位

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Coal Proc & Efficient Utilizat, Minist Educ, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lignite; Aqueous hydrogen peroxide-acetic; Anhydride; Mild oxidation;

    机译：褐煤;过氧化氢乙酸水溶液;酸酐;轻度氧化;

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