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首页> 外文会议>TAPPI(Technical Association of the Pulp and Paper Industry) Engineering, Pulping amp; Environmental Conference; 20061105-08; Atlanta,GA(US) >The possibility of controlling formation and cleavage reactions of HexA during kraft pulping
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The possibility of controlling formation and cleavage reactions of HexA during kraft pulping

机译：在牛皮纸制浆过程中控制HexA形成和裂解反应的可能性

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摘要

During kraft pulping, the side groups in the xylan backbone, 4-O-methyl-D-glucuronic acid (MeGlcA), are partly converted to hexenuronic acid (HexA). Simultaneously, degradation reactions of these side groups take place. In this study, the activation energies (Ea) for these reactions were determined during kraft pulping of birch from constant composition cook. The results show that Ea of bulk delignification (118kJ/mol, in accordance with earlier studies) is similar to that of HexA formation (129kJ/mol) and MeGlcA degradation (120kJ/mol), but it is lower than that of HexA degradation (141kJ/mol). The differences in activation energies imply a possibility of controlling the HexA and MeGlcA content in xylan by cooking temperature. This study demonstrated that this is indeed the case for the dissolved xylan, whereas pulp xylan is not markedly affected by a change in cooking temperature.
机译：在牛皮纸制浆过程中，木聚糖骨架中的侧基4-O-甲基-D-葡萄糖醛酸（MeGlcA）被部分转化为己糖醛酸（HexA）。同时，这些侧基发生降解反应。在这项研究中，在恒定成分蒸煮桦树的牛皮纸浆制浆过程中，确定了这些反应的活化能（Ea）。结果表明，本体去木质素化Ea（118kJ / mol，根据早期研究）与HexA形成（129kJ / mol）和MeGlcA降解（120kJ / mol）相似，但低于HexA降解（EkA）（120kJ / mol）。 141kJ / mol）。活化能的差异意味着有可能通过蒸煮温度来控制木聚糖中HexA和MeGlcA的含量。这项研究表明，溶解木聚糖的确是这种情况，而纸浆木聚糖不受蒸煮温度变化的明显影响。

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