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首页> 外文期刊>Holzforschung >Role of lignin and sodium carbonate on the swelling behavior of black liquor droplets during combustion
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Role of lignin and sodium carbonate on the swelling behavior of black liquor droplets during combustion

机译：木质素和碳酸钠在燃烧过程中黑液液滴溶胀行为中的作用

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摘要

A partial removal of lignin from black liquor (BL) by carbonation and lignin precipitation was studied. In lignin-lean BL droplets during combustion in a laboratory furnace at 800 degrees C in stagnant air, the maximum swelling was decreased. This observation was interpreted as showing that the lignin content decrement is due mainly to removal of higher molar mass (HMM) lignin and that the Na2CO3 content of the BL is increased. Stepwise precipitation experiments with industrial softwood and hardwood kraft BLs by carbonation (resulting in pH decrement from 13 to 9) indicated that a fraction of HMM lignin (MM 10 kDa) with a higher amount of carbohydrates precipitated more prominently and earlier than the fraction with lower molar mass (LMM) lignin (MM 10 kDa) containing less amounts of carbohydrates. Separate experiments with a 50/50 (by wt) mixture of different lignin fractions (1-5, 5-10 and 10 kDa) and BL-originated aliphatic carboxylic acids were performed and found that the mixture of medium MM fraction (MM 5-10 kDa) swelled more than the other lignin fractions. The addition of Na2CO3 to BL also reduced the maximum swelling of a BL droplet.
机译：研究了通过碳化和木质素沉淀从黑液（BL）中部分去除木质素的方法。在实验室炉中在800摄氏度的停滞空气中燃烧期间，木质素稀薄的BL液滴中，最大溶胀降低。该观察结果被解释为表明木质素含量的降低主要是由于去除了较高摩尔质量（HMM）木质素，而BL的Na2CO3含量却增加了。工业碳酸软木和硬木牛皮纸BLs的逐步沉淀实验表明，碳酸含量较高的HMM木质素（MM> 10 kDa）的一部分沉淀得比碳酸氢钾的部分更显着，更早。较低的摩尔质量（LMM）木质素（MM <10 kDa）包含较少的碳水化合物。使用不同木质素组分（1-5、5-10和> 10 kDa）和BL起源的脂肪族羧酸的50/50（按重量）混合物进行单独实验，发现中等MM组分（MM 5 -10 kDa）比其他木质素部分溶胀得更多。向BL中添加Na2CO3也减少了BL液滴的最大溶胀。

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