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    • 9. 发明授权
    • Process for detoxification of CCA-treated wood
    • CCA处理木材的解毒过程
    • US07160526B2
    • 2007-01-09
    • US10434529
    • 2003-05-09
    • Lin LianzhenChung-Yun HseTodd Finley Shupe
    • Lin LianzhenChung-Yun HseTodd Finley Shupe
    • C01G3/00C01G37/00C01G28/00
    • A62D3/33A62D2101/43B27K2240/15Y10S210/912Y10S210/913
    • A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating CCA-treated wood in the presence of a liquefying reagent such as an organic solvent at 100–250° C. with or without ferrous ions to form liquefied CCA-treated wood (b) adding water or an aqueous solution of an organic solvent to the liquefied CCA-treated wood with stirring to obtain an aqueous solution of liquefied CCA-treated wood (c) adding complexing or precipitating agents, such as phosphoric acid or calcium hydroxide to the aqueous solution of step (b) thereby precipitating insoluble heavy metal complexes or precipitates and forming a solution of detoxified CCA-treated wood (d) separating said heavy metal complexes or precipitates from the solution of detoxified liquefied CCA-treated wood and (e) isolating chromated copper arsenate from said heavy metal complex or precipitate.Further, the solvent may be removed from the solution of detoxified CCA-treated wood of step (d) to obtain concentrated liquefied detoxified CCA-treated wood. This concentrated material may be used as a phenolic or polyurethane intermediate.Additionally, by adding a concentrated inorganic acid, such as sulfuric acid, nitric acid or phosphoric acid, to the complex or precipitated solids of step (d), chromated copper arsenate can be recovered for use in manufacturing additional CCA-treated wood.
    • 回收用于回收CCA和解毒木材的废CCA(铜,铬,砷)处理木材的化学过程,包括以下步骤:(a)在液化试剂存在下处理CCA处理的木材,例如 有机溶剂在100-250℃下有或没有亚铁离子形成液化的CCA处理的木材(b)在搅拌下向液化的CCA处理的木材中加入水或有机溶剂的水溶液,得到液化的水溶液 CCA处理的木材(c)向步骤(b)的水溶液中加入络合或沉淀剂如磷酸或氢氧化钙,从而沉淀不溶重金属络合物或沉淀物并形成解毒的CCA处理的木材溶液(d) 从解毒的液化CCA处理的木材的溶液中分离所述重金属络合物或沉淀物,和(e)从所述重金属络合物或沉淀物中分离铬酸铜铜酸盐。 此外,溶剂可以从步骤(d)的解毒的CCA处理的木材的溶液中除去,得到浓缩的液化解毒的CCA处理的木材。 该浓缩物可用作酚醛或聚氨酯中间体。 此外,通过向浓缩步骤(d)的复合物或沉淀固体中加入浓硫酸,硝酸或磷酸等无机酸,可以回收铬酸铜铜,以制备额外的经CCA处理的木材。