利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

113 条记录 (耗时 0.015 秒)

    A PROCESS FOR THE PREPARATION OF COOKING LIQUORS HAVING HIGH SULPHIDITY FOR SULPHATE PULP COOKING
    92.
    发明授权
    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：EP0502052B1

    公开(公告)日：1994-10-05

    申请号：EP90917424.5

    申请日：1990-11-21

    申请人： EKA NOBEL AB ,  CHEMREC AKTIEBOLAG

    发明人： HEDBLOM, Mats-Olov ,  LINDBERG, Hans

    IPC分类号： D21C11/04

    CPC分类号： D21H17/00 ,  D21C11/04

    摘要： The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature which is obtained by energy supply from an external heat source and/or release of energy from the black liquor, a melt essentially consisting of sodium sulphide being formed and withdrawn to be further processed to cooking liquor. The process of the invention is characterized in that in addition there are fed to the reactor the whole or part of sulphur-containing and/or sulphur- and sodium-containing materials present in the pulp mill, including sulphur-containing and/or sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, in such a way that the mole ratio of sodium to sulphur in the total mixture fed to the reactor is within the range of 1.5 to 4. According to a preferred embodiment of the invention there is used an aqueous solution of the sodium sulphide melt obtained in so-called modified sulphate cooking.

    Control method with redox-potential
    95.
    发明公开
    Control method with redox-potential 失效
    具有氧化还原电位的控制方法

    公开(公告)号：EP0442250A3

    公开(公告)日：1994-06-01

    申请号：EP90850422.8

    申请日：1990-12-20

    申请人： EKA NOBEL AB

    发明人： Dalin, Ivan ,  Berglind, Troy

    IPC分类号： G05D21/02 ,  G01N27/416 ,  C23F1/00 ,  B01D53/34 ,  C23F1/16

    CPC分类号： C23F1/16 ,  B01D53/346 ,  B01D53/56

    摘要： A method of maintaining a given content of a substance A in an aqueous solution where it is continuously consumed and where the redox potential E, at least within the range of concentration used, approximately satisfies the equation:
            E = G + F(x)
    wherein x is the content of A, F is a function of x whose derivative dF/dx approaches zero when x assumes a high value, and G on the whole is independent of x but is influenced by other parameters, such as pH, temperature or the like. The addition of A is controlled in such manner that a set value of the redox potential is maintained. The set value is determined by increasing or decreasing the addition of A in a predetermined manner, whereupon the redox potential is measured, and the measured value is used for determining the set value.

    Process for bleaching of lignocellulose-containing material
    98.
    发明公开
    Process for bleaching of lignocellulose-containing material 失效
    漂白木质纤维素材料的方法。

    公开(公告)号：EP0554965A1

    公开(公告)日：1993-08-11

    申请号：EP93200857.6

    申请日：1992-04-08

    申请人： EKA NOBEL AB

    发明人： Andersson, Lennart ,  Basta, Jiri ,  Holtinger, Lillemor ,  Höök, Jan

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

    CPC分类号： D21C9/153 ,  D21C9/1042 ,  D21C9/1057 ,  D21C9/163

    摘要： The present invention relates to a process for delignification and bleaching of chemically digested lignocellulose-containing pulp, where the pulp, from which essentially no magnesium ions have been removed by acid wash, is treated with a complexing agent at a pH in the range from 4 up to 9.0, whereupon the pulp is bleached with ozone. The initial treatment with a complexing agent removes the ions of certain metals detrimental to the subsequent ozone bleaching, while retaining in the pulp the desirable ions, primarily of alkaline earth metals. Thereby, the selectivity in the delignification is increased and the strength of the pulp maintained. The pulp can be bleached with peroxide after the treatment according to the invention, to obtain the desired final brightness and completely avoid formation and discharge of chlorinated organic compounds.

    DIACYLATED DIPERCARBOXYLIC ACID AS BLEACHING AGENT
    100.
    发明公开
    DIACYLATED DIPERCARBOXYLIC ACID AS BLEACHING AGENT 失效
    二酰化dipercarboxylic酸作为漂白。

    公开(公告)号：EP0527899A1

    公开(公告)日：1993-02-24

    申请号：EP91909764.0

    申请日：1991-04-24

    申请人： EKA NOBEL AB

    发明人： LAGNEMO, Hans ,  FORSSTRÖM, Annbritt

    IPC分类号： C07C291 ,  C07C409 ,  C11D3

    CPC分类号： C07C291/04 ,  C07C409/34 ,  C07C409/40 ,  C07C409/42 ,  C11D3/3945

    摘要： L'invention concerne des acides dipercarboxyliques diacyles de formule générale suivante (I) dans laquelle R1 et R2 sont des groupes hydrocarbures composés de 1 à 15 atomes de carbone, et X attire les électrons en étant un groupe phényle optionnellement substitué, un hétérocycle optionnellement substitué dans lequel l'hétéroatome est positionné de façon que de 2 à 4 atomes de carbone soient présents entre l'hétéroatome et chacun des carbones carbonyles du diperacide, ou en comprenant au moins un groupe fonctionnel attirant les électrons positionné de façon qu'une chaîne carbone ayant de 2 à 4 atomes de carbone soit présente entre le groupe attirant les électrons et chacun des carbones carbonyles du diperacide, le groupe attirant les électrons contenant de l'oxygène, du soufre, de l'azote, du phosphore, de l'halogène, du phényle optionnellement substitué ou au moins deux liaisons doubles conjuguées, et R1 et R2 étant des groupes hydrocarbures comportant de 1 à 15 atomes de carbone, exceptés les composés dans lesquels X est constitué d'un groupe phényle dont les carbones carbonyles sont en positions 1 et 4 et dans lesquels R1 et R2 sont tous deux soit des acétyles, soit des nonyles. L'invention concerne également un procédé de préparation, une composition pour blanchiment et un procédé de blanchiment.