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Lignin Acidolysis Predicts Formaldehyde Generation in Pine Wood
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-02 00:00:00 , DOI: 10.1021/acssuschemeng.7b00264 Guigui Wan 1, 2 , Charles E. Frazier 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-02 00:00:00 , DOI: 10.1021/acssuschemeng.7b00264 Guigui Wan 1, 2 , Charles E. Frazier 1, 2
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Pinus virginiana wood was heated (200 °C, 10 or 60 min) while dry or after aqueous/acid/base pretreatment in order to reveal mechanisms of formaldehyde (CH2O) generation. Consistent with prior reports, among wood structural polymers, lignin was the overwhelming source of biogenic CH2O (defined as having a carbon source in wood). Effects of wood extractives were ignored and reserved for a later report. The selection of acid catalyst strongly affected CH2O generation as predicted in the acidolysis literature of lignin model compounds and isolated lignins. Lignin methoxyl cleavage was observed but considered an unlikely source of CH2O under the experimental conditions. Alkaline pretreatments did not catalyze CH2O generation above levels observed using neutral water. Regarding wood-based composite manufacture, the implications are that lignin reactions might be manipulated during hot-pressing. Potential benefits include reduced product emissions and/or novel cross-linking strategies using biogenic CH2O. Perhaps even lignin repolymerization could be promoted for benefit, in direct opposition to biorefinery strategies for lignin removal.
中文翻译：
木质素酸解可预测松木中的甲醛生成
干燥时或在水/酸/碱预处理后，将樟子松木加热（200°C，10或60分钟），以揭示甲醛（CH 2 O）生成的机理。与先前的报道一致，在木质结构聚合物中，木质素是生物CH 2 O（被定义为木材中具有碳源）的压倒性来源。木材提取物的影响被忽略，保留给以后的报告。如木质素模型化合物和分离的木质素的酸解文献所预测的那样，酸催化剂的选择强烈影响CH 2 O的产生。观察到木质素甲氧基裂解，但在实验条件下认为CH 2 O是不太可能的来源。碱性预处理不催化CH使用中性水观察到高于水平的2 O生成。关于木质复合材料的制造，其含义是木质素反应可能在热压过程中被操纵。潜在的好处包括减少产品的排放和/或使用生物CH 2 O的新颖的交联策略。也许甚至可以促进木质素的再聚合以获得益处，这与生物精炼厂去除木质素的策略直接相反。
更新日期：2017-05-31
中文翻译：
木质素酸解可预测松木中的甲醛生成
干燥时或在水/酸/碱预处理后，将樟子松木加热（200°C，10或60分钟），以揭示甲醛（CH 2 O）生成的机理。与先前的报道一致，在木质结构聚合物中，木质素是生物CH 2 O（被定义为木材中具有碳源）的压倒性来源。木材提取物的影响被忽略，保留给以后的报告。如木质素模型化合物和分离的木质素的酸解文献所预测的那样，酸催化剂的选择强烈影响CH 2 O的产生。观察到木质素甲氧基裂解，但在实验条件下认为CH 2 O是不太可能的来源。碱性预处理不催化CH使用中性水观察到高于水平的2 O生成。关于木质复合材料的制造，其含义是木质素反应可能在热压过程中被操纵。潜在的好处包括减少产品的排放和/或使用生物CH 2 O的新颖的交联策略。也许甚至可以促进木质素的再聚合以获得益处，这与生物精炼厂去除木质素的策略直接相反。
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