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chendy6822木虫 (知名作家)
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[求助]
求助翻译一段话（生物质热解）
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| 随着烘焙温度的升高，半纤维素分子间及分子内易形成氢键的羟基脱落形成水. 同时发生脱羧基、糖苷键断裂、环内C—O 基团断裂、C—C 键断裂, 并形成一系列的酸、醇、醛、醚类等焦油物质。以往研究表明，乙酸是热解液体产物中的主要有机组分，也是半纤维素的主要热解产物。从表8.2中可以看出，随着烘焙温度的升高，乙酸的含量逐渐增加。1-羟基-2-丙酮和糠醛也有相似的变化趋势。酚类物质主要来自于木质素的热解，酚类物质含量的增加显示出，随着烘焙温度逐渐增加，木质素的分解逐渐加大。 |
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leilejiayou
木虫 (正式写手)
- 翻译EPI: 26
- 应助: 30 (小学生)
- 金币: 3135.3
- 散金: 19
- 红花: 6
- 帖子: 474
- 在线: 122.8小时
- 虫号: 2307273
- 注册: 2013-02-28
- 性别: MM
- 专业: 聚合物共混与复合材料
【答案】应助回帖
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chendy6822: 金币+5, 翻译EPI+1 2013-10-30 21:44:30
chendy6822: 金币+5, 翻译EPI+1 2013-10-30 21:44:30
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With the increasment of baking temperature, it is easy for intermolecular and intramolecular of hemicellulose to form hydrogen bond then off the formation of the hydroxyl group in water. Simultaneously,there occurs decarboxylation, the fracture of glycosidic bond , the breaking of the C-O group ring, the breaking of the C-C bond, and the formation of a number of acids, alcohols, aldehydes, ethers such the tar substances.Previous studies showed that acetic acid is the primary organic component in liquid pyrolysis products , the primary product of shemicellulose pyrolysis as well . We can see from Table 8.2, with the increasment of baking temperature, the acetic acid content increased. 1 - hydroxy-2 - propanone and furfural have the similar trends. Phenols mainly come from lpyrolysis of ignin , increasing the content of phenolic compounds showed, as the baking temperature by degrees increased, the decomposition of lignin increase gradually. 供参考 |
2楼2013-10-28 14:01:39
【答案】应助回帖
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chendy6822: 金币+5 2013-10-30 21:44:42
chendy6822: 金币+5 2013-10-30 21:44:42
| With the increase of baking temperature, it is easy to break away hydrogen bond for hydroxyl group will break away from hydrogen bond to form water between or inner hemicelluloses molecular. At the same time, decarboxylation, the fracture of glycosidic bond and the C-O group ring and the break of the C-C bond will happen, and form the products of acids, alcohols, aldehydes, ethers, tar and so on. Previous studies showed that acetic acid is the primary organic component in liquid pyrolysis products , the primary product of shemicellulose pyrolysis as well. With the increase of baking temperature, the acetic acid content increased (Table 8.2). 1-hydroxy-2-propanone and furfural have the similar trends. Phenols mainly come from pyrolysis of lignin . The increase of phenolic compounds content showed that the decomposition of lignin increase gradually with the increase of baking temperature. |
3楼2013-10-29 09:40:05