过氧化氢氧化纤维素的研究

Study on Oxidation of Cellulose by Hydrogen Peroxide

关键词:  过氧化氢  纤维素  催化剂  聚合度

Key Words:hydrogen peroxide  cellulose  catalyst  DP

摘要:对过氧化氢为氧化剂制备氧化纤维素进行了研究，探讨了pH值、氧化反应时间、过氧化氢用量、催化剂Fe²⁺用量对纤维素氧化程度和降解程度的影响。研究表明，在浆浓1%，不加催化剂时，pH值为3，反应时间6 h，过氧化氢用量50%时得到的醛基含量为0.24 mmol/g和羧基含量为0.20 mmol/g，纸浆的平均聚合度为969；控制上述其他工艺条件不变，考察催化剂FeSO₄·7H₂O用量对纤维素氧化程度和降解程度的影响。实验结果表明，添加该催化剂后纸浆聚合度显著降低，最低降至611；在催化剂用量0.1%时，羧基含量达到最大值0.29 mmol/g；在催化剂用量0.6%时，醛基含量达到最大值0.42 mmol/g。

Abstract:The oxidized cellulose was prepared by using hydrogen peroxide to treat the pulp, The effects of the pH value, oxidation time, dosages of hydrogen peroxide and catalyst (Fe²⁺) on the oxidation degradation degree of the cellulose were investigated. The results showed that under the conditions of pulp concentration 1%, pH=3, reaction time 6 h, and dosage of hydrogen peroxide 50% and without adding catalyst, aldehyde group content of the treated pulp was 0.24 mmol/g, carboxyl group was 0.20 mmol/g, and DP=969. The influence of FeSO₄·7H₂O on oxidation degradation degree was analyzed with fixd the conditions as mentioned above. The results showed that the DP of the pulp decreased obviously to the lowest value(611). The highest content of carboxyl group 0.29 mmol/g was achieved when the doage of FeSO₄·7H₂O was 0.1%. The highest content of aldehyde group 0.42 mmol/g was achieved when the doage of FeSO4·7H2O was 0.6%.