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2 232 719

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IPC

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Application

2001133998/15, 2001-12-13

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Start date

2001-12-13

(22)

Actual filing date

2001-12-13

(45)

Published

2004-07-20

(72)

Inventor

Demakhin A.G.Sevost'Janov V.P.Kosenko S.I.Kapashin V.P.Nalivajko Aleksandr Ivanovich

(73)

Holder

Demakhin Anatolij Grigor'EvichSevost'Janov Vladimir PetrovichKosenko Sergej Ivanovich

METHOD FOR PREPARING ARSENIC OXIDE OF SPECIAL PURITY Russian patent published in 2004 - IPC

Abstract RU 2232719 C2

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing substances of the special purity, namely, to a method for preparing arsenic (III) oxide. Method for preparing arsenic oxide of the special purity involves the sublimation procedure of product and its condensation under vacuum. Processes are carried out in three zones with temperature gradient in each zone: -sublimation zone of the parent arsenic oxide at temperature 240-270 C; -condensation zone of the end arsenic oxide at temperature 160-180 C; -condensation zone of volatile impurities at temperature 120-140 C. Invention provides preparing arsenic (III) oxide with purity degree above 99.995 wt.-%.

EFFECT: improved preparing method.

1 tbl, 1 ex

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RU 2 232 719 C2

Authors

Demakhin A.G.

Sevost'Janov V.P.

Kosenko S.I.

Kapashin V.P.

Nalivajko Aleksandr Ivanovich

Dates

2004-07-20—Published

2001-12-13—Filed