Process for bleaching of lignocellulose-containing pulp
    101.
    发明公开
    Process for bleaching of lignocellulose-containing pulp 失效
    Verfahren zum Bleichen von Lignocellulose enthaltendem Zellstoff。

    公开(公告)号:EP0511695A1

    公开(公告)日:1992-11-04

    申请号:EP92201005.3

    申请日:1992-04-08

    申请人: EKA NOBEL AB

    IPC分类号: D21C9/10 D21C9/153 D21C9/16

    摘要: The present invention relates to a process for delignification and bleaching of chemically digested lignocellulose-containing pulp, wherein the pulp is acid treated at a pH of between about 1 and about 6, whereupon a water-soluble compound containing an alkaline earth metal is added at a pH of between about 1 and about 7 before the pulp is treated with a chlorine-free bleaching agent. The chlorine-free bleaching agent includes peroxide compounds, ozone, oxygen and sodium dithionite in an optional sequence or mixture. After the treatment according to the invention, the pulp may be finally bleached to the desired brightness, suitably with a chlorine-free bleaching agent, such as ozone, to completely avoid formation and discharge of AOX.

    摘要翻译: 本发明涉及一种用于脱木素和漂白化学消化的含木素纤维素的纸浆的方法,其中纸浆在约1至约6的pH下进行酸处理,由此将含有碱土金属的水溶性化合物加入到 在用无氯漂白剂处理纸浆之前约1至约7的pH。 无氯漂白剂以任选的顺序或混合物包括过氧化物,臭氧,氧和连二亚硫酸钠。 在根据本发明的处理之后,可以将纸浆最终漂白至所需的亮度,适当地用无氯漂白剂如臭氧漂白,以完全避免AOX的形成和排出。

    A PROCESS FOR THE PREPARATION OF COOKING LIQUORS HAVING HIGH SULPHIDITY FOR SULPHATE PULP COOKING
    102.
    发明公开
    A PROCESS FOR THE PREPARATION OF COOKING LIQUORS HAVING HIGH SULPHIDITY FOR SULPHATE PULP COOKING 失效
    工艺用于产生融合解决方案,确保硫化做饭硫酸盐。

    公开(公告)号:EP0502052A1

    公开(公告)日:1992-09-09

    申请号:EP90917424.0

    申请日:1990-11-21

    IPC分类号: D21C3 D21C11 D21H17

    CPC分类号: D21H17/00 D21C11/04

    摘要: Procédé de préparation, dans des conditions de réduction, de liqueurs de cuisson de sulfidité élevée pour la cuisson de pâte au sulfate, dans lequel la liqueur noire obtenue dans le procédé de cuisson est acheminée, après évaporation, complètement ou partiellement à un réacteur fonctionnant à une température élevée, laquelle est obtenue par une alimentation en énergie provenant d'une source de chaleur extérieure et/ou la libération d'énergie provenant de la liqueur noire, une fusion composée essentiellement de sulfure de sodium étant formée et retirée pour être traitée à nouveau afin d'obtenir une liqueur de cuisson. Le procédé de l'invention est caractérisé en ce que le réacteur reçoit également tout ou partie des matières contenant du soufre et/ou contenant du soufre et du sodium, présentes dans la fabrique de pâte à papier, parmi lesquelles les agents chimiques d'appoint contenant du soufre et/ou contenant du sodium et du soufre, utilisés dans le solde des agents chimiques totaux de la fabrique de pâte à papier, de sorte que le rapport molaire entre le sodium et le soufre dans le mélange total acheminé au réacteur, se situe dans la plage comprise entre 1,5 et 4. Selon le mode de réalisation préféré de l'invention, on utilise une solution aqueuse de la fusion de sulfure de sodium obtenue dans ladite cuisson au sulfate modifié.

    A process for the production of cellulose fibre containing products in sheet or web form
    104.
    发明公开
    A process for the production of cellulose fibre containing products in sheet or web form 失效
    一种用于生产片材或幅材纤维素含有纤维的化合物的过程。

    公开(公告)号:EP0490425A1

    公开(公告)日:1992-06-17

    申请号:EP91203122.6

    申请日:1991-11-28

    申请人: EKA NOBEL AB

    IPC分类号: D21H17/68 D21H17/29 D21H17/32

    摘要: Cellulose fibre containing products in sheet or web form, such as paper and pulp sheets, are produced from a suspension of cellulose containing fibres, and optional fillers, to which is added anionic inorganic particles, such as bentonite and silica based particles, and a cationic carbohydrate polymer containing aluminium. The cationic carbohydrate polymers are cationic galactomannans or cationic starch. High cationized starch with a degree of substitution of at least 0.07 are especially suitable.

    摘要翻译: 纤维素纤维包含产品在片或网的形式,颜色:如纸和纸浆片材中,从悬浮液中的纤维素的含纤维和任选的填料,产生向其中加入阴离子无机颗粒,颜色全部:如膨润土和基于硅石的颗粒和阳离子 碳水化合物聚合物含有铝。 阳离子糖类聚合物是阳离子半乳甘露聚糖或阳离子淀粉。 度为至少0时07取代高阳离子化淀粉是爱特别合适的。

    Method of analysis
    105.
    发明公开
    Method of analysis 失效
    Analyseverfahren。

    公开(公告)号:EP0485000A2

    公开(公告)日:1992-05-13

    申请号:EP91202713.3

    申请日:1991-10-21

    申请人: EKA NOBEL AB

    IPC分类号: G01N31/00 G01N31/16 G01N21/31

    摘要: A method and system for determining the content of hydrogen peroxide in an aqueous solution are described. The solution is brought to a pH below 6, supplied with excess I⁻ and catalyst, and irradiated with light, the absorbance being measured at a predetermined wavelength. The system comprises a hydrogen peroxide containing solution (15), e.g. from a swimming pool, an analyser (20) and a microcomputer (4) for controlling the system. A monochromatic light source (2) transmits light through the sample in the analyser cuvette (1) to a photocell (3) connected to the microcomputer (4). A display (5) is also connected to the microcomputer (4). Supply of sample and reagents from reagent tanks (10,11) to the cuvette (1) is controlled by the microcomputer (4). The method of system can be used to control the supply of hydrogen peroxide to an aqueous system.

    摘要翻译: 描述了用于测定水溶液中过氧化氢含量的方法和系统。 使溶液的pH低于6,提供过量的I +和催化剂,并用光照射,以预定波长测量吸光度。 该系统包含含过氧化氢的溶液(15),例如 游泳池,分析器(20)和用于控制系统的微型计算机(4)。 单色光源(2)将分析器比色皿(1)中的样品的光透过到与微型计算机(4)连接的光电管(3)。 显示器(5)也连接到微型计算机(4)。 从微型计算机(4)控制从试剂罐(10,11)到比色皿(1)的样品和试剂供应。 系统的方法可用于控制向含水体系中过氧化氢的供应。

    A method and a device for preparing brine
    107.
    发明公开
    A method and a device for preparing brine 失效
    Verfahren und Vorrichtung zur Herstellung von Sole。

    公开(公告)号:EP0470940A2

    公开(公告)日:1992-02-12

    申请号:EP91850179.2

    申请日:1991-06-26

    申请人: EKA NOBEL AB

    IPC分类号: C01D3/08 B01F1/00

    CPC分类号: C01D3/08 Y10S422/902

    摘要: The invention concerns a method of preparing brine from sodium chloride salt containing one or more water-soluble impurities having an aqueous dissolution rate lower than that of sodium chloride, the method comprising the steps of:

    (a) forming a salt bed in a vessel, the vessel including a grid for supporting the salt bed;
    (b) wetting at least a portion of the salt bed with a flow of water;
    (c) forming a brine solution by at least partially dissolving the wetted portion of the salt bed in the water;
    (d) forming small solid particles in the wetted portion of the salt bed, said small particles containing one or more water-soluble impurities but substantially no sodium chloride;
    (e) passing the brine and the small solid particles containing soluble impurities through the grid and out of the salt bed;
    (f) separating the brine from the small solid particles.

    The invention also concerns a device for making brine by dissolving salt in water, which device comprises a vessel (3) containing a grid support (4), means (2, 23) for supplying solid salt (1), means (32, 42) for supplying water, means (14, 15) for the outflow of brine, and means (9) for removing undissolved salt particles (8) at the bottom of the vessel (3).

    摘要翻译: 本发明涉及一种由氯化钠盐制备盐水的方法,该方法含有一种或多种具有低于氯化钠水溶解速率的水溶性杂质的水溶性杂质,该方法包括以下步骤:(a)在容器中形成盐床, 该容器包括用于支撑盐床的格栅; (b)用水流润湿至少一部分盐床; (c)通过将盐床的润湿部分至少部分地溶解在水中形成盐水溶液; (d)在盐床的润湿部分中形成小的固体颗粒,所述小颗粒含有一种或多种水溶性杂质,但基本上不含氯化钠; (e)使盐水和含有可溶性杂质的小固体颗粒通过栅格并离开盐床; (f)从小固体颗粒中分离出盐水。 本发明还涉及一种通过将盐溶解在水中来制造盐水的装置,该装置包括一个容纳有格栅支架(4)的容器(3),用于提供固体盐(1)的装置(2,33),装置 ),用于输出盐水的装置(14,15)以及用于去除容器(3)底部的未溶解盐颗粒(8)的装置(9)。

    Process for the production of chlorine dioxide
    108.
    发明公开
    Process for the production of chlorine dioxide 失效
    Verfahren zur Herstellung von Chlordioxyd。

    公开(公告)号:EP0465447A1

    公开(公告)日:1992-01-08

    申请号:EP91850169.3

    申请日:1991-06-19

    申请人: EKA NOBEL AB

    IPC分类号: C01B11/02

    CPC分类号: C01B11/028

    摘要: A process for the production of essentially chlorine free chlorine dioxide whereby a flow of chlorine dioxide obtained from reduction of alkali metal chlorate and containing by-product of chlorine gas is absorbed in water and the chlorine gas is treated in the water solution with formic acid by addition of this to the water or to the water solution, whereby the addition of formic acid is made in addition to any existing by-product of formic acid from the chlorine dioxide production. The formic acid is added in an amount resulting in a mole ratio formic acid to chlorine gas of > 1:1.

    摘要翻译: 一种用于生产基本上无氯的二氧化氯的方法,其中由碱金属氯酸盐还原并含有氯气的副产物获得的二氧化氯流被吸收在水中,氯气在水溶液中用甲酸处理 将其加入到水或水溶液中,由此除了二氧化氯生产中任何现有的甲酸副产物之外还加入甲酸。 甲酸的加入量使得甲酸与氯气的摩尔比> 1:1。

    A process for the production of paper
    109.
    发明公开
    A process for the production of paper 失效
    Verfahren zur Herstellung von Papier。

    公开(公告)号:EP0462953A1

    公开(公告)日:1991-12-27

    申请号:EP91850148.7

    申请日:1991-05-30

    申请人: EKA NOBEL AB

    发明人: Helmer, Ulla

    IPC分类号: D21H23/02

    CPC分类号: D21H17/55 D21H23/14

    摘要: A process for the production of wet strength paper using a polyamine or polyamideamine resin modified with cross-linking agent. The wet strength resin is added at a lower pH of the stock and the pH of the wet web is then increased before the drying whereby improved retention of the resin and improved wet strength of the produced paper are obtained.

    摘要翻译: 使用用交联剂改性的多胺或聚酰胺胺树脂生产湿强纸的方法。 在原料的较低pH下加入湿强度树脂,然后在干燥之前增加湿纸幅的pH,从而获得改善的树脂保持率和改善生产纸的湿强度。

    A method of preparing chlorate
    110.
    发明公开
    A method of preparing chlorate 失效
    Verfahren zur Herstellung von Chlorat。

    公开(公告)号:EP0459961A2

    公开(公告)日:1991-12-04

    申请号:EP91850127.1

    申请日:1991-05-15

    申请人: EKA NOBEL AB

    CPC分类号: C25B15/08 C01B11/14

    摘要: The invention discloses a method in the electrolytic production (1) of alkali metal chlorate which is recovered by crystallization (3) and separation (9) of the crystals from a solution recycled to the electrolysis process (1). A given proportion of the crystals formed are separated (6) and removed from the mother liquor after they have been in contact with the mother liquor for a shorter period of time than the remaining crystals, whereby they obtain a sulphate content which is higher than in the crystals that have been in contact with the mother liquor for a longer period of time.

    摘要翻译: 本发明公开了一种电解生产(1)碱金属氯酸盐的方法,其通过结晶(3)和从循环到电解过程(1)的溶液中分离(9)晶体而回收。 形成的晶体的一定比例与母液在母液接触后比其余晶体短(6)分离,并从母液中除去,由此得到的硫酸盐含量高于 与母液接触较长时间的晶体。