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2. 发明授权

US5567293A Electromembrane processes for the treatment of kraft mill electrostatic precipitator catch 失效
标题翻译：用于处理牛皮纸磨机静电除尘器捕获的电膜工艺
公开(公告)号：US5567293A
公开(公告)日：1996-10-22
申请号：US362200
申请日：1994-12-22
申请人： Michael Paleologou , Richard M. Berry , Rokhsareh Thompson , James T. Wearing
发明人： Michael Paleologou , Richard M. Berry , Rokhsareh Thompson , James T. Wearing
IPC分类号： B01D61/44 , D21C11/06
CPC分类号： B01D61/44 , B01D61/445 , D21C11/066
摘要： A process for the recovery of alkali metal hydroxide and acid from the alkali metal salts of monovalent anions which are mixed with the alkali metal salts of multivalent anions employs a water-splitting system composed of bipolar membranes in conjunction with ion-selective membranes; a two-compartment cell employs monovalent anion-selective membranes to define salt/base and acid compartments with the bipolar membranes, and a three-compartment cell employs, monovalent anion-selective and cation-selective membranes to define with the bipolar membranes, acid, salt and base compartments; the process has particular applicability to the conversion of the sodium/potassium chloride portion of the Electrostatic Precipitator (ESP) Catch of the recovery boiler of coastal and/or closed-cycle kraft pulp mills, a mixture of mostly sodium/potassium sulphate and chloride, into sodium/potassium hydroxide and hydrochloric acid; the remaining sodium/potassium sulphate solution, depleted in chloride, can thus be used as sodium/sulphur make-up to the recovery cycle or converted to sulphuric acid and sodium/potassium hydroxide; a simpler version of the process, can be employed for the electrodialytic separation of ESP catch into its component sodium chloride and sodium sulphate; when a three-compartment water-splitting or electrodialysis system is used, potassium ions are preferentially removed from the feed compartment, over sodium, thus removing this undesirable non-process element from the alkali metal sulphate portion which is returned to the recovery cycle; there is also described approaches through which a partially or totally effluent free (TEF) kraft pulp mill can be achieved in terms of the elements sodium, sulphur and chlorine.
摘要翻译：与多价阴离子的碱金属盐混合的一价阴离子的碱金属盐回收碱金属氢氧化物和酸的方法采用由双极性膜结合离子选择性膜组成的水分解系统; 双隔室电池采用单价阴离子选择膜来界定与双极膜的盐/碱和酸隔室，并且三室电池采用单价阴离子选择性和阳离子选择性膜，以双极膜，酸，盐和隔间; 该方法特别适用于沿海和/或封闭循环牛皮纸浆厂的回收锅炉的静电除尘器（ESP）捕获剂的钠/氯化钾部分的转化，其主要是硫酸钠/硫酸钾和氯化钾，加入氢氧化钠/氢氧化钾和盐酸; 因此，剩余的氯化钠/硫酸钾溶液可用作钠/硫补充回收循环或转化为硫酸和氢氧化钠/氢氧化钾; 该方法的一个更简单的版本，可以用于电渗析分离成其组分氯化钠和硫酸钠的ESP捕获; 当使用三室水分解或电渗析系统时，钾离子优先从进料室除去钠，从而从返回到回收循环的碱金属硫酸盐部分除去这种不需要的非工艺元素; 还描述了可以通过元素钠，硫和氯来实现部分或全部不含流出物（TEF）牛皮纸浆厂的方法。

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