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2 361 816

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(51)

IPC

C01F7/54(2006-01-01)

(21) (22)

Application

2008102671/15, 2008-01-23

(24)

Start date

2008-01-23

(22)

Actual filing date

2008-01-23

(45)

Published

2009-07-20

(72)

Inventor

D'Jachenko Aleksandr NikolaevichKrajdenko Roman Ivanovich

(73)

Holder

Gosudarstvennoe Obrazovatel'Noe Uchrezhdenie Vysshego Professional'Nogo Obrazovanija Tomskij Politekhnicheskij Universitet

METHOD OF PRODUCING CRYOLITE Russian patent published in 2009 - IPC C01F7/54

Abstract RU 2361816 C1

FIELD: chemistry.

SUBSTANCE: cryolite is obtained by mixing aluminium oxide, sodium chloride and ammonium hydrodifluoride or fluoride in stoichiometric ratio, taken in excess of up to 20% of the stoichiometric ratio. The obtained mixture is heated at the first stage to 240°C and kept at this temperature until complete separation of ammonia gas and water, and at the second stage - to 400°C and kept until complete subliminal removal of ammonium chloride.

EFFECT: invention allows for obtaining cryolite and ammonium chloride at the same time.

2 ex

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RU 2 361 816 C1

Authors

D'Jachenko Aleksandr Nikolaevich

Krajdenko Roman Ivanovich

Dates

2009-07-20—Published

2008-01-23—Filed