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…     

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     

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     

SYNERGISTIC EFFECTS BETWEEN BIRCH CHEMICAL MECHANICAL PULPS AND ASPEN BLEACHED KRAFT PULP

INTRODUCTIONIn papermaking, it is very often that more than one type (or grade) of pulps are used to develop paper sheet properties necessary for both machine runnability and requirement from the end users. In many high end paper grades (e.g., various high brightness printing/writing papers), long fiber from softwood bleached kraft pulp traditionally is often used in combination with short fiber from hardwood bleached kraft pulp (HBKP). In this combination, the long fiber component provi…     

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.     

碱性H_2O_2处理蔗渣化学浆的漂白效应

目前采用次氯骏盐漂白纸浆纤维的损伤大,废水严重污染.研究采用无污染漂白剂H_2O_2探索了总碱、碱比、预处理和漂温等对漂白过程的影响和作用机理,指出H_2SO_4预处理后的蔗渣化学浆,在NaOH用量1.5%、Na_2SiO_3用量3.5%、MgSO_4用量0.05%、70℃的漂温下漂白2小时H_2O_2消耗2.367%,经草酸适当的中和还原后,漂浆的白度从39.5%(SBD)提高到7l%,白度增值高,白度的稳定性好,得率也高,因之H_2O_2漂白剂是发展我国草浆漂白有前途的力法.     

氧化镁作亚硫酸镁盐浆氧漂的保护剂

进行亚硫酸镁盐法浆（下称镁盐浆）的氧气漂白（Ｏ）试验，氧漂浆的过氧乙酸（ＰＡ）预处理和Ｈ２Ｏ２漂白（Ｐ）试验，以及样品的傅立叶变换红外光谱、Ｘ－射线衍射研究．结果证明，添加ＭｇＯ的氧漂浆，在白度、粘度、结晶度等方面均优于添加ＭｇＳＯ４的氧漂浆；应用Ｏ′ＫＩ法红外结晶指数及Ｘ－射线衍射法结晶度均能较好地反映样品的结晶结构变化．Ｏ－ＰＡ－Ｐ漂白流程为实现镁盐浆全无氯、短序、高白度漂白提供一种有效途径．     

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…     

INFLUENCES OF BLAECHING ADDITIVES ON REED PULP FAST BLEACHING

SUMMARYWith the development of paper machine and the enlarger of cooking capability, higher requirement of bleaching system in paper mill is brought forward. At present, many straw-pulp mills completed single-stage hypochlorite bleaching through horizontal bleaching machine, which had the disadvantages of large area and low product ability. So there always was no enough space for paper mills to increase the product ability. Bleaching process became the key handicap to increase the product a…     

STUDY OF COORDINATED PRETREATMENT OF XYLANASE AND LACCASE ON SODA-AQ WHEAT STRAW PULP BEFORE CEH BLEACHING

INTRODUCTIONXylanase pretreatment can produce many small holes on pulp surfaces and cross section by removing part xylose that may be sucked back or exists in style of LCC. Thus penetrability of following chemicals. Olsen [1] observed coordinated pretreatment of xylanase and lignin enzyme (compound of lignin peroxide enzyme and manganese peroxide enzyme) had better delignification than sole xylanase and sole laccase lignin enzyme. So we can forecast that coordinated pretreatment of xylan…     

生物化学方法处理硫酸盐苇浆漂白废水

分析了硫酸盐苇浆三段漂白（氟化Ｃ、碱处理Ｅ、次氯酸盐漂白Ｈ）各段废水的污染负荷，设计连续完全混合工曝气系统对其进行生物化学处理。通过对活性污泥的培养驯化、废水的进料速度及浓度、通气量等工艺条件的正交试验研究，并结合工业生产实际情况，得出了用该法处理漂白废水的最佳条件：经稀释后废水浓度４０％（ＣＡＤ值在２０００左右）、温度２５℃￣３０℃，通气量７６Ｌ／ｈ、废水停留时间３ｈ。废水ＣＯＤ去除率达８７％。     

蕃茄品种早熟,抗病和高产比较试验

观察了３个品种的主要生物学性状及产量，初步筛选出早熟，抗病，高产的蕃茄良种“合作９０３”。     

果粒果汁饮料的稳定性研究

研究了黄原胶、CMC、C型悬浮剂等4种稳定剂在果粒果汁饮料中的稳定效果。研究结果表明:C型悬浮剂的悬浮效果最好,是果粒果汁饮料的首选浮剂;黄原胶、A 悬浮剂有较好稳定效果,也可作悬浮剂使用,但用量大,液体透明度较差;而CMC不能单独做果粒果汁的悬浮剂。     

冀东春小麦高产栽培配套技术研究

利用春小麦在冀东生育期短的特点,以冀张春三号小麦为试材,对影响产量的主要栽培措施(播期、播量、施肥期、施肥量及群体结构等)进行探讨。从而找出投入少,收效大的最佳栽培系列指标,实行规范化的种植,使春小麦生产达到高产栽培。     

THE COMPARISON OF STRENGTH PROPERTY BETWWEEN KRAFT PULP AND ALKALINE SULFITE-ANTHRAQUINONE PULP FOR THICKER CELL WALL FIBER MATERIALS

INTRODUCTIONMany studies on the strengths of AS-AQ pulp have been carried out. Generally speaking, except lower tear strength, other strength properties of AS-AQ pulp are similar to those of KP. Some even higher than KP[1,2]. Macleod[3] find that the difference in tear strength between the AS-AQ pulp and KP of aspen can be decreased about bleaching. McDonough et al[4] point out that at the same beating degree, the tear strength of AS-AQ pulp is lower than that of KP, but at the …     

STUDY ON THE DIGESTION PROCESS OF ASF-AQ WHEAT STRAW PULP

INTRODUCTIONChina is the country that produces the largest amount of wheat-straw pulp in the world. In North China, wheat-straw is used as the main row material for pulping. At present, the dominating pulping method of straw-wheat is soda-AQ. This method has many drawbacks. Its yield is difficult to reach 40%, its original pulp has low brightness (lower than 30%SBD), and its bleachability is also low. Three-stage bleaching sequence (CEH) is needed to obtain high brightness pulp. It c…     

高产优质大叶茶新品系“云抗12号”选育研究

云抗12号是从云南大叶茶群体一南糯大叶茶中采用系统选育法培育而成．经过多年的品种比较试验和区域性试验，表现为：植株乔木型，中生种，树姿开张；叶长椭圆形，叶色黄绿，芽叶茸毛多，持嫩性强；产量高，平均产优质干茶457．59kg／ha；鲜叶内含物质丰富，适制优质红绿茶；抗茶小绿叶蝉．     

用硫酸锰作催化剂高压蒸汽消化法测定废水中的化学需氧量

本文提出用硫酸锰作催化剂,以高压蒸汽消化的方式测定废水中的化学需氧量,用已知 COD 的谷氨酸标准溶液优选试样消化时的最佳条件.用此方法测定了8种实际废水样,结果与标准回流法比较,最大相对误差小于±10%,变异系数小于5%,本方法具有成本低、操作简单、能批量分析的优点.     

桉木半化学浆配抄箱纸板研究

探讨了柠檬桉、窿缘桉为主的阔叶木制取半化学浆及其配抄箱纸板的可行性。研究结果表明，桉木经ＮａＯＨ－ＡＱ法制取半化学浆能与荻苇半化学浆配抄出符合质量要求的箱纸板。     

高分辨率事件地层学和高分辨率地层学

高分辨率事件地层学提高了年代地层划分和对比精度 ,其分辨率可达 2 0～ 5 0 ka,甚至更高。这就导致了高分辨率地层学的发展 ,是未来地层学的发展趋势。高分辨率地层研究结果的巨大潜力可以在年代地层学中引发一场革命。该文简要介绍了高分辨事件地层学的基本概念和研究方法 ,以及与高分辨率地层学的关系