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| 1 | ENZYMATIC DEINKING OF NONIMPACT PRINTED WASTES显示文摘Cellulase deinking process of non-impact printed wastes was studied. The optimized conditions were: cellulase charge 0.3%, temperature 50℃, pulping consistency 10%, enzyme treatment time 30 min,agitating speed 400 rpm. Qquality of the deinking pulp was assessed by measuring the number, average diameter, percent coverage of residual ink using Paperican ink scanner. | QinghuaXu ShulanShi MenghuaQin | 2004 | 天津科技大学学报2004，19，A02： | 2 |
| 2 | THE EFFECT OF DIFFERENT STABILIZERS ON ALKALINE H_2O_2 BLEACHING OF NS REED PULP显示文摘This paper uses a new stabilizer of H2O2 bleaching and compares the stabilizing effect of the new stabilizer with that of Na2SiO3. The results show that the new stabilizer is better than the conventional Na2SiO3. The optimum conditions of the stable latter process bleaching of H2O2 as follow: NaOH 3%, MgSO4 0.05%, H2O2 3%, stabilizer 3%, temperature 80℃, concentration 12%, time 3h. | MeihongNiu ShulanShi YunzhanZhang | 2004 | 天津科技大学学报2004，19，A02： | 2 |
| 3 | HYDROLYSIS OF PAPER-DISHWARE WASTES BY CELLULASE显示文摘The optimum conditions of hydrolysis of cellulosic wastes by cellulase were studied. The results show that the optimum conditions of sulfuric acid pretreatment were sulfuric acid consistency 0.3M,pretreatment temperature 100℃, pretreatment time 4hours. After sulfuric acid pretreatment, the optimum conditions of hydrolysis by cellulase were enzymatic temperature 50℃,enzymatic time 48hours,pH4.8,the charge of cellulase 100IU/g and the substraste consistency 60g/l. Meanwhile this paper studies that the structural change of cellulose during sulfuric acid pretreatment and cellulase hydrolysis by analyzing the infrared spectra. | JieLu ShulanShi RunanYang FuzhengLiang | 2004 | 天津科技大学学报2004，19，A02： | 0 |
| 4 | THE STUDY ON TCF BLEACHING OF NS REED PULP显示文摘In this paper, we have researched TCF bleaching on reed pulp including oxygen delignification, oxygen delignification with H2O2 intensification and H2O2 bleaching. The results show that Op-P bleaching process on NS reed pulp is suitable and the brightness of bleached pulp is up to 82%ISO. | MeihongNiu ShulanShi JinghuiZhou YunzhanZhang | 2004 | 天津科技大学学报2004，19，A02： | 0 |
| 5 | PEROXYACID ENHANCED OXYGEN DELIGNIFICATION OF KRAFT PULP显示文摘Effect of peroxyacid (a mixture of peroxymonosulfuric acid and peroxyacetic acid) pretreatment on oxygen delignification of kraft pulp from eucalyptus was studied, and the conditions of pretreatment (e.g. DTPA charge, peroxyacid charge, pretreatment time, pretreatment temperature and pH value) were optimized. The results show that peroxyacid pretreatment prior to oxygen delignification could enhance oxygen delignification of kraft pulp, and result in selective delignification and increased delignified-pulp brightness. The optimum conditions of peroxyacid pretreatment were as follows: peroxyacid charge 3% (on peroxymonosulfuric acid), 60℃, 30min, 12% pulp consistency, pH5.0. Pretreatment with 0.5%DTPA was essential before peroxyacid pretreatment. Under the optimum conditions, the degree of delignification and brightness of final pulp were increased by 12.4% (from 44.9% to 57.3%) and 4.9%(ISO, from 54.0% to 58.9%) respectively while maintaining a similar viscosity of final pulps compared to single oxygen delignification. | JianZhao XuezhiLi ShulanShi HuirenHu | 2004 | 天津科技大学学报2004，19，A01： | 0 |
| 6 | TREATMENT OF SWEET GUM LIGNIN BY LACCASE AND LMS显示文摘Cellulolytic enzyme lignin (CEL) from sweet gum is treated by laccase and laccase/mediator system(LMS). Phenolic hydroxyl content of lignin is measured, and IR, GPC, 13C-NMR spectrograms are analyzed. Compared with control sample, phenolic hydroxyl content of lignin is a little higher after laccase treatment, whereas they are lower after LMS treatment. In LMS, lignin modification by laccase/ABTS is greater than by laccase/VA. It is found from IR that in lignin treated by laccase and LMS, relative content of siringyl hydroxyl group is higher, and α- conjugated carbonyl group content is a little higher. From GPC analysis, compared with control sample, molecular weight decrease after the treatment by laccase and LMS. And the decrement is greater by laccase alone than by LMS. According to 13C-NMR, relative content of carbonyl group and methoxyl group increase during the treatment by laccase alone, but the amount of them are lower after LMS treatment. And the amount of Cαand Cβ in β-O-4 has a little decrement after LMS treatment. It indicates that the oxidation of lignin by laccase and LMS proceed through different reaction pathways. | HualiWei ShulanShi JichengPei | 2004 | 天津科技大学学报2004，19，A02： | 0 |
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