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首页> 外文会议>Appita Annual Conference and Exhibition incorporating the ISWFPC(International Symposium on Wood, Fibre and Pulping Chemistry) vol.2: 13th ISWFPC Sessions - Oral Papers; 20050516-19; Auckland(NZ) >Estimation of proportions of different pulp types in recycled paper and deinked pulp by acid methanolysis
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Estimation of proportions of different pulp types in recycled paper and deinked pulp by acid methanolysis

机译：酸性甲醇分解法估算再生纸和脱墨纸浆中不同纸浆的比例

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摘要

We have developed and evaluated a method to estimate the proportion of bleached kraft pulp from hardwoods (HP), bleached kraft pulp from softwoods (SP) and mechanical pulp (MP) in deinked pulp (DIP) or recycled paper (RP) by analysis of the sugar units in hemicelluloses and pectins. Different pulps, i.e., HP, SP and MP, were obtained from Nordic pulp mills. The pulps were mixed in different proportions and dried. The content of arabinose, xylose, mannose, galactose, rhamnose, galacturonic acid and 4-O-methyl-glucuronic acid in hemicelluloses and pectins in the different pulps and in the mixtures were determined by acid methanolysis and gas chromatography (GC). The contents of the sugar units were significantly different in the three pulp types, but quite similar in the same pulp type, irrespectively of bleaching sequence. A linear model for estimating the relative proportions of HP, SP and MP in DIP or RP were formulated. Hence, given a predefined set of errors, ε_i, and data of HP, SP and MP, the relative proportions can be estimated by solving a linear least-squares problem. It was concluded that the proportion of hardwood kraft pulp, softwood kraft pulp and mechanical pulp in deinked pulp or recycled paper can be estimated using a mathematical model based on the contents of the sugar units in hemicelluloses and pectins. The difference between the actual mixing ratio and the estimated values was on average less than ± 5%.
机译：我们已经开发并评估了一种方法，该方法可通过以下方法估算脱墨纸浆（DIP）或再生纸（RP）中来自阔叶木（HP）的漂白牛皮纸浆，来自软木（SP）的漂白牛皮纸浆和机械纸浆（MP）的比例。半纤维素和果胶中的糖单位。从北欧纸浆厂获得不同的纸浆，即HP，SP和MP。将纸浆以不同比例混合并干燥。通过酸性甲醇分解和气相色谱法（GC）测定不同果肉和混合物中半纤维素和果胶中阿拉伯糖，木糖，甘露糖，半乳糖，鼠李糖，半乳糖醛酸和4-O-甲基-葡萄糖醛酸的含量。在三种纸浆类型中，糖单元的含量均显着不同，但在相同纸浆类型中，无论漂白顺序如何，其糖单元含量均非常相似。建立了线性模型，用于估计DIP或RP中HP，SP和MP的相对比例。因此，给定一组预定义的误差ε_i以及HP，SP和MP的数据，可以通过解决线性最小二乘问题来估计相对比例。结论是，可以基于半纤维素和果胶中糖单元的含量，使用数学模型来估计脱墨纸浆或再生纸中硬木牛皮纸浆，软木牛皮纸浆和机械纸浆的比例。实际混合比和估计值之间的差异平均小于±5％。

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