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Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition
Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition
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机译:通过添加硼酸盐提高碱性制浆液苛化效率的方法
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摘要
A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide is regenerated from sodium carbonate-containing smelts in such pulp processes by autocausticization through the addition of limited amounts of borate. Autocausticization may be carried out at boron to carbonate molar ratios below 2:1 and at sodium to boron molar ratios exceeding 3:1, resulting in high reaction efficiency. Partial autocausticization using borate may also be combined with conventional lime recausticization for the regeneration of sodium hydroxide from sodium carbonate-containing smelts.
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