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    • 1. 发明授权
    • Spent caustic (pre)treatment process
    • 废碱(预处理)处理过程
    • US5885422A
    • 1999-03-23
    • US807873
    • 1997-02-26
    • Sabah A. KurukchiJoseph M. Gondolfe
    • Sabah A. KurukchiJoseph M. Gondolfe
    • B01D3/14B01D3/38C10G19/08B01D11/04
    • C10G19/08B01D3/143B01D3/38
    • A process for pretreating a spent caustic stream prior to oxidation includes countercurrent multi-stage elevated temperature solvent extraction of dissolved organic material from the spent caustic using a solvent to yield a spent caustic raffinate containing only residual amounts of organic solute. The raffinate is steam distilled to remove the residual organic solutes, yielding a pretreated spent caustic stream substantially free of organic material. The pretreated spent caustic is suitable for use in a Kraft paper process or for oxidation prior to recycle or disposal. Solvent extract from the extractor is regenerated in a solvent regenerator having an overhead stream for purging light ends, a bottom stream for purging heavy ends, and a heart-cut side stream for recycling solvent to the extractor. Alternatively, solvent may be taken as a cut from an existing plant process stream, once passed through the multi-stage solvent extraction unit, and then returned to the processing unit of the plant from which it was taken.
    • 用于在氧化之前预处理废碱液的方法包括使用溶剂从废碱中逆流多级高温溶剂萃取溶解的有机物质,产生仅含有剩余量的有机溶质的废碱液残液。 蒸馏塔蒸馏塔以除去残留的有机溶质,得到基本上不含有机物质的经预处理的废碱流。 预处理的废碱适用于牛皮纸工艺或在循环或处理之前进行氧化。 来自萃取器的溶剂萃取物在具有用于吹扫轻馏分的塔顶物流的溶剂再生器,用于净化重馏分的底部流以及用于将溶剂再循环到萃取器中的切断侧流进行再生。 或者,可以将溶剂作为来自现有植物工艺流的切片,一旦通过多级溶剂提取单元,然后返回到从其获取的植物的处理单元。