STUDY ON THE ELEMENTAL CHLORINE FREE BLEACHING OF BAMBOO KRAFT PULP

1INTRODUCTIONChina is a country using the most variety of non-wood fiber raw material and is the largest country producing non-wood fiber pulp and paper in the world[1]. Bamboo is one kind of the main non-wood species for papermaking in China. Although the structure of raw materials for papermaking has being adjusted through increasing the proportion of wood pulp and by effectively utilizing waste paper source, non-wood species will still remain an important fiber resource[1,2].At present…     

THE STUDY ON TCF BLEACHING OF NS REED PULP

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.     

蔗渣浆全无氯漂白的研究

本本文探讨了在Op段低NaOH用量,P段低H2O2用量的条件下采用OpQP流程将蔗渣浆漂至82%ISO的可行性,并讨论了非硅过氧化氢漂白稳定剂代替硅酸钠用于过氧化氢漂白的可行性。研究表明非硅过氧化氢稳定剂PP-2,PP-1耐高温、高压,可用于压力过氧化氢漂白。在Op段2%NaOH,0.5%H2O2;P段3% H2O2,PP-1 0.1%, PP-2 0.5%条件下,蔗渣浆采用OpQPo流程,漂后浆白度达到85%ISO。OpQPo从根本上消除了AOX的产生,经测定漂白废水属于可生物降解废水,只有Q和P段的部分废水进入废水处理系统, 容易通过常规的污水处理方法达到日益严格的国家排放标准。     

PEROXYACID ENHANCED OXYGEN DELIGNIFICATION OF KRAFT PULP

1INTRODUCTIONNew pulping and bleaching technologies, which do not use chlorine-base chemicals, continue to be developed in the pulp and paper industry worldwide to meet stricter environmental regulation and increased public environmental awareness. ECF (Element-chlorine-free) and TCF (Total-chlorine-free) bleaching sequence had been used in bleaching plant to reduce the amount of chlorinated organic compounds in the bleach plant effluent. Oxygen delignification was gradually becoming a …     

KRAFT WOOD PULP TCF AND ECF BLEACHING WITH ENZYME PRETREATMENT *

针叶木硫酸盐浆用木聚糖酶Ｉｒｇａｚｙｍｅ４０＿Ｘ４进行预处理,然后进行各种无元素氯（ＥＣＦ）和全无氯（ＴＣＦ）漂白．实验结果表明,酶预处理能提高后续漂白效果,提高白度,降低卡伯值,并改善纸浆的粘度,在不用元素氯的情况下,能将纸浆漂白到８８％ＩＳＯ以上的白度     

蔗渣浆的全无氯漂白工艺

对蔗渣浆采用过氧化氢强化的氧脱木素(OP)-螯合预处理(Q)-压力过氧化氢漂白(PO)的短序漂白,探讨了将蔗渣浆漂至82%ISO和用非硅过氧化氢漂白稳定剂代替硅酸钠用于过氧化氢漂白的可行性.研究表明,非硅过氧化氢稳定剂PP-1与PP-2耐高温、耐高压,可用于压力过氧化氢漂白.OP段氢氧化钠用量为2.0%(相对于绝干浆质量,下同)、过氧化氢用量为0.5%,PO段过氧化氢用量为3.0%、PP-1用量为0.1%、PP-2用量为0.5%时,蔗渣浆采用OPQPO流程漂白后,浆的白度可达到85%ISO.而且OPQPO从根本上消除了可吸附有机卤化物的产生;经测定,漂白废水属于可生物降解废水.     

活化剂在麦草硫酸盐浆中无氯和少氯漂白中的应用

在麦草ＫＰ浆的无氯和少氯漂白程序中使用活化剂,可促进脱木素作用并提高浆的白度。在氧脱木素前用ＮＯ２,硫酸和过氧酸进行预处理比较,以ＮＯ２效果最佳。ＮＯ２用量２％,处理后浆的卡伯值比未处理降低了６％,白度提高４％,粘度只下降１．６％。在Ｄ／ＣＥＤＤ漂白程序中,漂前用对有效氯用量８％的Ｓ１２预处理,白度提高２．３％ＩＳＤ,粘度基本无变化;活化剂ＴＡ用于ＮＯＰ三段漂的Ｐ段,用量４％（对浆）,可提高白度４．３％ＩＳＯ,粘度也有明显提高。本试验采用ＧＯＰＡＰＴＡ无氯漂白程序,可使麦草ｋｐ浆漂后白度达８０％ＩＳＯ,但粘度下降较大     

ONP脱墨浆二氧化硫脲漂白研究

实验主要探讨了ONP脱墨浆FAS单段漂白的工艺条件,找出了FAS漂白的最佳工艺条件为:FAS用量0.6%,NaOH用量0.3%,漂白温度65℃,漂白时间30min,浆浓10%,在此条件下漂后浆白度达66.6%ISO。     

桉木硫酸盐浆LMS生物漂白的研究

进行了桉木硫酸盐将漆酶一介体系统（LMS）生物漂白的研究,漆酶由白腐菌Panus conchatus固体发酵并分纯化而制得;一种新的介体－－N－羟基乙酰苯胺（NHA）自行合成,采用L／MQP漂白流程,仅用2％（质量分数）的H2O2就将桉木常规硫酸盐浆（EMCC－O）可达到87．6％ISO的白度,生物漂白的CK浆和EMCC－O浆的粘度都很高,说明漆酶／NHA生物漂白的脱木素选择性很好。     

ENZYMATIC BLEACHING OF WHEAT STRAW SODA-AQ PULP BY LMS TREATMENT

Laccase has been proven that it has a good selectivity and efficiency in pulp bleaching. In this paper, the effects of LMS (Laccase Mediator System) treatment on delignification and bleaching of wheat straw pulp at various conditions, such as laccase dosage,temperature, oxygen pressure and pH, were investigated. The TCF sequence including LMS can bleach the wheat straw pulp to 81% ISO brightness with good strength. The synergetic biobleaching of LMS and xylanase of wheat straw pulp was also investigated. It was found that the final brightness and strength of synergetic biobleaching pulps increased to a certain extent and the bleaching selectivity was improved. The combination of the enzymes is feasible for the delignification and bleaching.     

废报纸脱墨浆H_2O_2漂前预处理

研究了Na2SO3与DTPA联合用于废报纸脱墨浆H2O2漂前预处理的效果,并与尿素、DTPA、硫酸、EDTA预处理剂的预处理效果进行了比较。结果表明,Na2SO3与DTPA联合是种优良的预处理剂,与其他预处理剂相比,可使漂后浆白度提高1.4%～4.2%ISO。     

混合商品桉木片原料硫酸盐浆氧脱木素工艺优化

针对混合商品桉木片硫酸盐法制浆漂白过程强度损失较为严重问题,利用正交实验方法完成混合商品桉木片硫酸盐浆氧脱木素工艺优化,确定在NaOH用量2%、时间60,min、温度100,℃、氧压0.5,MPa、MgSO4用量0.2%的条件下,纸浆的打浆度为15°SR,其抗张指数达到39,N·m/g以上,黏度780,mL/g.通过单因素实验,进一步探讨氧脱木素工艺中NaOH用量对于纸浆性能的影响,提出氧脱木素工段NaOH用量与纸浆黏度、卡伯值分别具有线性关系:Yη=-17.84,XNaOH+829.92,R2=0.989,8;Ykappa=-0.62,X NaOH+10.56,R2=0.995,9.     

单段氧脱木素特性的研究

研究了马尾松硫酸盐浆单段氧脱木素的特性,研究结果表明：影响马尾松硫酸盐浆氧脱木素的因素有：时间,温度,用碱量,氧压,保护剂MgSO4的用量及反应浆浓,从纸浆中木素的脱出和纸浆的粘度出发,各因素都有一较合适的用量,其中,氧压在0．5－0．6MPa之间,时间80min,温度100℃,NaOH用量3％－5％,MgSO4用量0．5％－1．0％,浆浓10％－12％,在以上条件并保证浆粘度不致降低很大的条件下,纸浆的木素脱出率较大。     

硫酸盐木浆漂白前木聚糖酶预处理的研究

研究了木聚糖酶用于硫酸盐木浆 H2 O2 漂白前预处理的工艺条件 ,结果表明 ,预处理最佳工艺条件为 :酶用量为每克浆 2 0 IU ,时间 3h,浆浓为 6 %。在相同的 H2 O2 漂白条件下 ,经酶处理后的浆料白度可提高 2 %～ 3% SBD。     

INFLUENCE OF NON-PROCESS ELEMENTS ON REED PULP''''S CHARACTERS DURING OXYGEN DELIGNIFICATION

INTRODUCTIONOxygen delignification is widely used in many bleached pulp-grade operation to diminish the levels of residual lignin in kraft[1]. The chemistry of oxygen delignification has undergone a renaissance in the last decade.Although the chemical structure and reactivity of residual lignin play a role in its effective removal, a variety of metal ions, frequently refers to as non-process elements(NPEs), they are either originated in pulp or introduced are also suggested to strongly a…     

桉木硫酸盐浆TCF漂白的研究

研究桉木硫酸盐浆H2O2强化的氧脱木素效果;研究KMnO4和螯合物对桉木硫酸盐氧漂浆H2O2漂白的改善效果,并对其最佳工艺条件及各种因素对漂白效果的影响进行探讨。结果表明：在氧脱木素过程中加入少量的H2O2,就能起到很好的强化效果;氧漂浆在KMnO4的预处理、DTPA处理后再经过H2O2漂白,可使KP法桉木浆白度达80％以上。     

INFLUENCE OF NON-PROCESS ELEMENTS ON REED PULP′S CHARACTERS DURING OXYGEN DELIGNIFICATION

A series of Reed Pulps were prepared in which the level of Non-Process Elements (NPEs), including calcium, manganese,copper,iron were seclectively enriched and depleted, these pulps were then oxygen delignification,and the pulps were characterized according to kappa number, viscosity,brightness. The results indicated that the enrichment of NPEs have an important effulence on delignification,pulp viscosity and brightness, iron is the most harmful during oxygen delignification but manganese is just like a kind of aid and can enhance brightness and delignification.     

蔗渣浆的压力过氧化氢漂白

对烧碱-蒽醌(Soda-AQ)法蔗渣浆分别进行了螯合预处理(Q)和常压过氧化氢(P)、压力过氧化氢(PO)漂白的研究,探讨了单段PO漂白蔗渣浆的可行性.正交试验结果表明,PO漂白蔗渣浆优化的漂白条件为漂白温度100℃、时间80min、压力0.6MPa、NaOH用量0.4%.PO漂白浆的白度较高,达84.0%ISO,特性黏度为825.3mL/g,比QP漂白浆的白度高9.9%ISO;PO漂白浆的物理强度性能也较好,浆料的抗张指数为66.67N.m/g,撕裂指数为9.34mN.m2/g,耐破指数为4.31 kPa.m2/g,耐折度为39次.PO漂白废水的化学耗氧量、生化耗氧量及色度较低,漂白废水可全部逆流回用,大大减少了污染排放.     

改良木聚糖酶辅助漂白芦苇浆的工艺研究

采用分子改良后的木聚糖酶对芦苇浆进行生物预处理,考察了改良木聚糖酶辅助漂白的效果。结果表明,酶预处理可以降低CEH三段漂白中氯化C段的氯气用量60%。改良木聚糖酶预处理辅助漂白芦苇纸浆最佳条件为:pH为7.0,温度60℃,浆浓(质量分数)5%,酶用量12μmol/(min.g),预处理时间60 min。在此条件下C段氯用量降至对照的40%时,酶处理漂后样品白度可达到84.0%(ISO),高出对照样的白度3.7%(ISO)。改良木聚糖酶预处理还能够改善纸浆漂后样的物理性能。     

THE OXYGEN-ALKALI BLEACHING OF THE STRAW PULP

1INTRODUCTIONAt present, the pulp industry is facing to the large stress against using bleaching agents which contain the chlorine. And the paper making industry has fixed the attention to lighten the environment pollution. To reduce the pollution, many countries have carry through the TCF (total chlorine free bleaching), and that the oxygen-alkali bleaching is one of the maturate technology of TCF by now. To obtain clean produce the oxygen-alkali bleaching of NaOH-AQ straw pulp has b…