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2 243 608

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IPC

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Application

2003104859/06, 2003-02-17

(24)

Start date

2003-02-17

(22)

Actual filing date

2003-02-17

(45)

Published

2004-12-27

(72)

Inventor

Zil'Berman B.Ja.Makarychev-Mikhajlov M.N.Saprykin V.F.

(73)

Holder

Gosudarstvennoe Unitarnoe Predprijatie Nauchno-Proizvodstvennoe Ob"Edinenie Institut Im. V.G. Khlopina"

METHOD FOR CLEANING NITRIC ACID FROM FLUORIDE ADMIXTURES Russian patent published in 2004 - IPC

Abstract RU 2243608 C2

FIELD: recovery of liquid radioactive wastes.

SUBSTANCE: proposed method involves distillation in aluminum nitrate environment used as complexing agent. Nitric acid of 0.5 - 6 mole/l concentration is distilled with nitric acid anion being in short supply and with apparatus still holding partially hydrolyzed aluminum nitrate of 80 - 130 g/l concentration with respect to metal at aluminum-to-fluoride molar ratio over 1. Complexing agent is introduced in evaporator together with main charge or passed onto top plate as reflux.

EFFECT: enhanced degree of purification, reduced salinity of system.

2 cl, 1 tbl, 4 ex

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RU 2 243 608 C2

Authors

Zil'Berman B.Ja.

Makarychev-Mikhajlov M.N.

Saprykin V.F.

Dates

2004-12-27—Published

2003-02-17—Filed