METHOD OF PRODUCING SODIUM SULPHATE Russian patent published in 2015 - IPC C01D5/16

Abstract RU 2556927 C2

FIELD: chemistry.

SUBSTANCE: in order to purify sodium sulphate, aqueous sodium sulphate solution containing sodium nitrate and sodium nitrite impurities is mixed with carbamide and sodium bisulphate in molar ratio carbamide:sodium bisulphate:total of sodium nitrate and nitrite equal to 0.5:1.0:1.0. Alternatively, carbamide and sulphuric acid can be added in molar ratio carbamide:sulphuric acid:total of sodium nitrate and nitrite equal to 0.5:0.5:1.0. The solution is boiled. Waster is evaporated until temperature of the reaction mixture reaches 125°C. The residue is dried at 140-200°C for not less than 15 minutes.

EFFECT: invention reduces total content of sodium nitrate and nitrite in sodium sulphate.

1 tbl, 2 ex

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RU 2 556 927 C2

Authors

Laskin Boris Mikhajlovich

Voznjuk Olesja Nikolaevna

Shajbakov Rustem Akhtjamovich

Dates

2015-07-20—Published

2013-12-04—Filed