Preparation and Characterization of Various Kraft Lignins and Impact on Their Pyrolysis Behaviors,Industrial & Engineering Chemistry Research

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Preparation and Characterization of Various Kraft Lignins and Impact on Their Pyrolysis Behaviors
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-02-14 , DOI: 10.1021/acs.iecr.9b06690
Ajoy Kanti Mondal _{1,

2} , Chengrong Qin ₃ , Arthur J. Ragauskas _{4,

5} , Yonghao Ni _{1,

6} , Fang Huang _{1,

3}

Affiliation

Lignin-derived chemicals and fuel products have received much attention in the context of bio-refinery. In this study we prepared and characterized various lignin samples from black liquor (BL), a major byproduct from the pulp and paper manufacturing processes, and studied the pyrolysis behaviors of these isolated lignin samples at 600 °C under a N₂ atmosphere. Three lignin samples were isolated from the Kraft pulping BL of Loblolly pine linerboard grade process (KL, obtained by direct evaporation; L10, obtained by precipitation at pH 10; L3, obtained by precipitation at pH 3), while another three were from the Kraft pulping BL of Loblolly pine bleach grade process (KB, B10, B3). The inorganic elements present in lignin samples were analyzed using an inductively coupled plasma (ICP) analyzer. The KL and KB samples contained a larger amount of inorganic elements, especially Na and S, than did the other lignin samples. Owing to large quantities of inorganic elements, the ash contents in KL and KB were higher than in the precipitated lignin samples (L10, B10, L3, and B3). These inorganic elements have a significant effect on the subsequent pyrolysis process, as a result, more extensive depolymerization of lignin occurred in KL and KB samples, leading to the formation of fewer pyrolysis oils, with lower molecular weights. NMR analyses of pyrolysis oils show that more methoxyl groups and ether bonds were cleaved, resulting in fewer methoxyl groups and aromatic C–O bonds for the KL and KB heavy oil than for the precipitated lignin heavy oil.

中文翻译：

各种牛皮纸木质素的制备，表征及其热解行为的影响

木质素衍生的化学品和燃料产品在生物精炼领域受到了广泛关注。在这项研究中，我们从黑液（BL）（制浆和造纸过程中的主要副产物）制备并表征了各种木质素样品，并研究了这些分离的木质素样品在N ₂下于600°C的热解行为。大气层。从Loblolly松木厚纸板级工艺的牛皮纸制浆BL中分离了三个木质素样品（KL，通过直接蒸发获得； L10，通过在pH 10沉淀获得； L3，通过在pH 3沉淀获得），而另外三个则是从牛皮纸火炬松松木漂白工艺制浆BL（KB，B10，B3）。使用电感耦合等离子体（ICP）分析仪分析木质素样品中存在的无机元素。与其他木质素样品相比，KL和KB样品包含大量的无机元素，尤其是Na和S。由于大量的无机元素，KL和KB中的灰分含量高于沉淀的木质素样品（L10，B10，L3和B3）。这些无机元素对后续的热解过程具有重大影响，因此，在KL和KB样品中，木质素发生了更广泛的解聚反应，从而形成了较少的，分子量较低的热解油。裂解油的NMR分析表明，与沉淀的木质素重油相比，KL和KB重油中的甲氧基和醚键被裂解得更多，从而导致更少的甲氧基和芳族C-O键。

更新日期：2020-02-17

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