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    • 6. 发明授权
    • Alkali metal cyanoborohydride reductive bleaching liquor
    • ALKALI金属氰尿酸还原漂白液
    • US3637516A
    • 1972-01-25
    • US3637516D
    • 1969-08-19
    • VENTRON CORP
    • WADE ROBERT C
    • D21C9/10D06L3/10
    • D21C9/1084
    • The invention provides an aqueous reductive bleaching liquor containing the material to be bleached selected from groundwood pulp, kraft pulp, chemigroundwood pulp and clay dispersed therein in conventional amounts. As the reducing agent, a cyanoborohydride is dissolved in the liquor in an amount between about 0.01 and about 0.3 percent based upon the dry weight of the selected material to be bleached. The liquor has a pH between about 3 and 6 and is stable at a temperature between room temperature and about 180* F. The cyanoborohydride is selected from lithium, potassium, and sodium cyanoborohydride, sodium cyanoborohydride being preferred.
    • 本发明提供含有常规量的含有待漂白材料的水性还原性漂白液,其选自底泥浆,牛皮纸浆,化学木槿纸浆和粘土。 作为还原剂,基于待漂白材料的干重,将氰基硼氢化物溶解在液体中的量为约0.01至约0.3%。 该液体的pH值介于约3和6之间,并且在室温至约180°F之间的温度下是稳定的。氰基硼氢化钠选自氰基硼氢化锂,钾和钠,优选氰基硼氢化钠。