Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1986-03-06
1990-01-02
Doll, John
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C01G 2800
Patent
active
048912077
ABSTRACT:
Manufacture of arsenic acid by oxidation of arsenic trioxide with hydrogen peroxide is potentially hazardous, especially when making concentrated solutions of arsenic acid as sought by the users. The process also can suffer from substantial wasteful decomposition of hydrogen peroxide. The problems arise from or are exacerbated by the nature of the reactants, the exothermic character of the principal and decomposition reactions and the formation of localized hot spots.
The problems can be ameliorated by introducing the reagents with agitation into a body of reaction product and maintaining the reaction mixture at a temperature of not more than 70.degree. C. and preferably 45.degree. to 55.degree. C. By carrying out the process in such a manner, it can accomodate even low grade arsenic trioxide as reagent.
REFERENCES:
patent: 4341743 (1982-07-01), Tebbe
patent: 4447405 (1984-05-01), Ahn et al.
Kirk-Othmer, "Encyclopedia of Chemical Technology", 3rd Ed., vol. 13, pp. 13-15, 26 & 27.
Wallace, John G., "Hydrogen Peroxide in Organic Chemistry", (Dupont), pp. 119-121.
Interox, "Peroxygen Compounds in Organic Synthesis", part 19.
Shumb, et al., "Hydrogen Peroxide", pp. 467-468 and 478.
Breneman R. Bruce
Doll John
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