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2 008 255

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IPC

(21) (22)

Application

5020739/26, 1992-01-03

(22)

Actual filing date

1992-01-03

(45)

Published

1994-02-28

(72)

Inventor

Kochetkov S.P.Parfenov E.P.Lembrikov V.M.Malakhova N.N.Vasil'Ev A.I.Lesovaja S.N.

(73)

Holder

Voskresenskij Filial Nauchno-Issledovatel'Skogo Instituta Po Udobrenijam I Insektofungitsidam Im.Prof.Ja.V.Samojlova Nauchno-Proizvodstvennogo Ob"Edinenija

METHOD OF PHOSPHORIC ACID CONCENTRATION Russian patent published in 1994 - IPC

Abstract RU 2008255 C1

FIELD: chemical technology. SUBSTANCE: wet-process phosphoric acid is evaporated in apparatus with foamy layer by direct contact with heat carrier. Superheated steam is used as a heat carrier, which is fed to the zone of concentrator contact at the rate 11-16 m/s; temperature of exhaust steam from concentrator is 105-120 C due to regulation of ratio acid: heat carrier. Spent steam is purified from fluoride compounds by dry procedure on the solid adsorbents and fed at the stage of concentration. Thus, phosphoric acid containing 65% P₂O₅ and 0.01-0.03% F is obtained. EFFECT: enhanced efficiency and improved ecology of process. 2 cl, 2 tbl

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RU 2 008 255 C1

Authors

Kochetkov S.P.

Parfenov E.P.

Lembrikov V.M.

Malakhova N.N.

Vasil'Ev A.I.

Lesovaja S.N.

Dates

1994-02-28—Published

1992-01-03—Filed