【摘要】 对内切纤维素酶Ι(EGΙ)在混合办公废纸酶法脱墨中的作用进行了研究。结果表明:EGΙ在混合办公废纸脱墨中起着明显作用,浆料经EGΙ处理后浮选有比较高的油墨脱出率。EGΙ脱墨的最佳工艺条件为:温度60℃,pH值7.5,时间40min,每克浆酶用量0.5IU;酶处理过程中随着酶用量的增加,纸浆平均聚合度呈下降趋势,当每克浆酶用量为0.5IU时,纸浆聚合度下降的幅度不大。含有碳酸钙填料和(或)涂料的废纸其灰分的存在影响酶脱墨效果;酸处理可提高油墨脱出率,浆料经酸处理后可进一步提高EGΙ的脱墨效果。更多还原

【Abstract】 The performance of endoglucanase I （EG Ι） was investigated in the deinking process of mixed office waste paper（MOW）. Results showed the optimal treatment conditions of temperature 60 ℃,pH value 7.5, treated time 40 min and enzyme dosage 0.5 IU per gram pulp. Though enzymic treatment decreased the degree of polymerization（DP） of pulp, the DP decreased limitedly within definite enzyme dosage. EG Ι played an important role in the deinking process of MOW because the improvement of ink-removal in floated pulp after EG Ι treatment was achieved. Meantime the existence of ash in waste paper with fillers or coating （consisted mainly of CaCO₃） affected deinking efficiency . An acid treatment could enhance deinking efficiency and further improved the deinking effectiveness of EG Ι .更多还原