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Method for producing copper arsenate compositions

  • 发布日期:2016-09-07 15:09
  • 有效期至:2017-09-07 [已过期]
  • 专利技术区域:北美洲
  • 浏览次数265
 
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  • Patent number: 5026530
    Abstract: A method of preparing copper arsenate compositions having unique advantges in lower cost and higher performance for use in preparing chromated copper arsenate wood preserving formulations. These copper arsenate compositions are insoluble copper arsenate in water or as a dry reactive powder, have a mol ratio of As.sub.2 O.sub.5 to CuO of 1:4, and is readily soluble in chromic acid to form CCA wood preservatives. This copper arsenate is prepared by reacting suitable copper-bearing materials with arsenic trioxide and air or oxygen in ammoniacal solutions. Either or both of the starting raw materials, i.e., the copper and the arsenic, may be very impure, which impure materials were heretofore unsuitable for the production of copper arsenate.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: June 25, 1991
    Assignee: Drinkard Developments
    Inventors: William F. Drinkard, Jr., Hans J. Woerner
 
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