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    Stabilized sodium dithionite solutions
    2.
    发明授权
    Stabilized sodium dithionite solutions 失效
    稳定的连二亚硫酸钠溶液

    公开(公告)号：US3985674A

    公开(公告)日：1976-10-12

    申请号：US531290

    申请日：1974-12-10

    申请人： Leonard C. Ellis ,  Mearl A. Kise

    发明人： Leonard C. Ellis ,  Mearl A. Kise

    IPC分类号： C01B17/66 ,  D21C9/10

    CPC分类号： C01B17/665 ,  D21C9/1089

    摘要： Sodium dithionite bleaching solutions for groundwood pulps which require no additional chemicals for pH adjustment prior to direct application to the pulps, based on zinc-derived or formate-derived sodium dithionite and containing small percentages of at least four additives selected from the following: a chelating agent, zinc dithionite, zinc sulfate, sodium carbonate, sodium hydroxide, sodium tripolyphosphate, sodium phosphate, and sodium metaborate. Tested chelating agents are nitrilotriacetic acid (NTA) trisodium salt and ethylenediaminetetraacetic acid (EDTA) tetrasodium salt. The solutions are cool-stable (50.degree.F. or 10.degree.C) for at least 5 days with less than 5% decomposition of the sodium dithionite, and several exhibit similar stability at storage temperatures of 70.degree.-75.degree.F. (21.degree.-24.degree.C.) A method of preparation of the solutions is also provided. Bleaching performance was proved in laboratory and field trials to be comparable to the performance of solutions prepared from dry, commercially available sodium dithionite blends or commercial zinc dithionite when compared on a basis of pounds of bleaching agent per ton of pulp per point brightness gain.

    摘要翻译： 用于磨木浆的连二亚硫酸钠漂白溶液，其不需要额外的化学品用于在直接施用于纸浆之前进行pH调节，基于来自锌的或甲酸酯衍生的连二亚硫酸钠并且含有少量至少四种选自以下的添加剂：螯合剂 试剂，连二亚硫酸锌，硫酸锌，碳酸钠，氢氧化钠，三聚磷酸钠，磷酸钠和偏硼酸钠。 测试的螯合剂是次氮基三乙酸（NTA）三钠盐和乙二胺四乙酸（EDTA）四钠盐。 溶液是冷稳定（50°F或10℃）至少5天，连二亚硫酸钠分解少于5％，几个在70°-75°F的储存温度下表现出相似的稳定性（21 DEG-24℃）也提供了制备溶液的方法。 在实验室和现场试验中证明了漂白性能可以与从干燥的市售的连二亚硫酸钠混合物或商业的连二亚硫酸锌制备的溶液的性能相当，当基于每磅纸浆每磅亮度增益的漂白剂的磅数进行比较时。

    Method for stabilizing sodium dithionite
    6.
    发明授权
    Method for stabilizing sodium dithionite 失效
    稳定二氧化锰的方法

    公开(公告)号：US5114698A

    公开(公告)日：1992-05-19

    申请号：US567836

    申请日：1990-08-15

    申请人： Donald M. Oglesby ,  George E. Wells, IV

    发明人： Donald M. Oglesby ,  George E. Wells, IV

    IPC分类号： C01B17/66

    CPC分类号： C01B17/665

    摘要： A method of stabilizing sodium dithionite is disclosed which comprises exposing a quantity of sodium dithionite to a quantity of amino material under pressure, wherein the partial pressure of amino material is at least 0.5 atmospheres.

    摘要翻译： 公开了一种稳定连二亚硫酸钠的方法，其包括在一定压力下将一定量的连二亚硫酸钠暴露于一定量的氨基材料，其中氨基材料的分压至少为0.5个大气压。

    Compositions containing dithionites
    8.
    发明授权
    Compositions containing dithionites 失效
    含有DITHIONITES的组合物

    公开(公告)号：US3840644A

    公开(公告)日：1974-10-08

    申请号：US21679972

    申请日：1972-01-10

    申请人： LEIGH R

    发明人： LEIGH R

    IPC分类号： C01B17/66 ,  D06L4/30

    CPC分类号： C01B17/665 ,  D06L4/30

    摘要： 1. A SUBSTANTIALLY ANHYDROUS COMPOSITION COMPRISING A MAJOR PROPORTON OF A METALLIC DITHIONITE AND AN EFFECTIVE AMOUNT OF A STABILIZER THEREFORE WHICH IS A NOMSURFACTANT COMPOUND CONTAINING AT LEAST 5 CARBON ATOMS AND AT LEAST ONE GROUP OF THE STRUCTURE:

    -CO-N
    WHEREIN THE UNSATISFIED VALENCIES ARE FILLED BY OXYGEN, HYDROGEN OR CARBON ATOMS, SAID COMPOUND BEING MONOMERIC OR CONTAINING NOT MORE THAN 10 REPEATING UNITS AND HAVING A MOLECULAR WEIGHT OF UP TO 600.

    摘要翻译： 1382252连二亚硫酸盐的稳定性ALBRIGHT＆WILSON有限公司1972年1月14日[1971年1月14日1971年7月1日1971年7月14日] 1930/71 30937/71和32965/71标题C1A [也在D1部]稳定化的金属连二亚乙烯基本上是无水的 组合物包含主要比例（重量）的金属连二亚硫酸盐和作为稳定剂的非表面活性剂，含有至少5个碳原子的非聚合化合物和一组结构，其中不饱和的碳价格被碳原子填充， 不饱和的氮价由氢和/或碳原子填充或通过环化脱水由所述化合物形成的环状化合物填充。 本发明被认为特别适用于连二亚硫酸钠，但其它金属连二亚硫酸盐如钾和钙也可以类似地稳定。 稳定化仅通过将稳定剂与连二亚硫酸盐混合来实现，如果两者都是固体形式。 或者，连二亚硫酸盐可以与稳定剂的熔体或稳定剂的有机溶液混合，然后将其蒸发至干。 作为本方法要求保护的稳定剂的化合物包括：牛油一乙醇酰胺，月桂酸二乙醇酰胺，亚甲基双硬脂酰胺，亚乙基双硬脂酰胺，亚甲基双油酰亚胺双酚A，苯甲酰胺，吡啶鎓盐，硫氰酸酯或磷酸酯，羟基羧酸 醚。

    Sodium dithionite solution stablization
    9.
    发明授权
    Sodium dithionite solution stablization 失效
    SODIUM DITHIONITE SOLUTION STABLIZATION

    公开(公告)号：US3804944A

    公开(公告)日：1974-04-16

    申请号：US25576972

    申请日：1972-05-22

    申请人： VIRGINIA CHEMICALS INC

    发明人： KISE M ,  ELLIS L

    IPC分类号： C01B17/66

    CPC分类号： C01B17/665

    摘要： SODIUM DITHIONITE IN SOLUTION IS WIDELY USED IN BLEACHING AND VAT DYEING OF TEXTILES. UNFORTUNATELY, HOWEVER, LOSSES OCCUR NOT ONLY THROUGH DECOMPOSITION DURING DISSOLVING OF THE SALT IN QUESTION, BUT ALSO DURING STORAGE OF THE SOLUTION. IN THE PRESENT METHOD AND REACTION PRODUCT, ONE AVOIDS DECOMPOSITION AND EFFECTIVELY STABILIZES VARIOUOUS CONCENTRATION LEVELS OF THE DITHIONITE SOLUTION WITH CAUSTIC SODA ADDED AT 1.4% TO 20% BY WEIGHT OF THE SODIUM DITHIONITE PRESENT, THE ADDITION BEING MADE UNDER CONTROLLED CONDITIONS. FOR EXAMPLE, WHILE MINIMIZING AIR EXPOSURE, THE PH IS GENERALLY MAINTAINED ABOVE 9 AND EXCESSIVE CAUSTIC SODA ADDITION IS AVOIDED. ALSO, TEMPERATURE IS CONTROLLED (TO APPROXIMATELY 50*F.) FOR BEST EFFECT.

    Sodium dithionite solution stabilization
    10.
    发明授权
    Sodium dithionite solution stabilization 失效
    SODIUM DITHIONITE解决方案稳定

    公开(公告)号：US3773679A

    公开(公告)日：1973-11-20

    申请号：US3773679D

    申请日：1972-01-14

    申请人： VIRGINIA CHEMICALS INC

    发明人： KISE M ,  ELLIS L

    IPC分类号： C01B17/66

    CPC分类号： C01B17/665

    摘要： Sodium dithionite in solution is widely used in bleaching and vat dyeing of textiles. Unfortunately, however, losses occur not only through decomposition during dissolving of the salt in question, but also during storage of the solution. To avoid decomposition of such solutions, the presence of sulfite ion is introduced by sodium sulfite, or a comparable variant compound preferably with a pH adjustment under either aerobic or anaerobic conditions. The effect hereof in protecting the sodium dithionite against aerobic decomposition is at 7 percent to 45 percent of the decomposition rate for unprotected systems. With air exclusion, the rate in the protected system is at 2 percent to 71 percent that for the unprotected system. As indicated, mixtures of sodium sulfite or sodium bicarbonate with sodium bisulfite (anhydrous) have likewise been found effective as a stabilizing media for the sodium dithionite solution, all by virtue of the sulfite ion concentration increase therein.