Method for producing copper arsenate compositions

Details Method for producing copper arsenate compositions Method for producing copper arsenate compositions

1990-03-30

1991-06-25

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group va metal or arsenic

423601, 423602, C01G 2802

Patent

active

050265300

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.

REFERENCES:
patent: 1085898 (1914-02-01), Fischer
patent: 1517516 (1924-12-01), Lloyd et al.
patent: 1596662 (1926-08-01), Jenkins et al.
patent: 2112102 (1938-03-01), Klumpp
patent: 2573252 (1951-10-01), Farber

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