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2 437 835

(13)

(51)

IPC

C01F11/46(2006-01-01)

(21) (22)

Application

2010121048/05, 2010-05-24

(24)

Start date

2010-05-24

(22)

Actual filing date

2010-05-24

(45)

Published

2011-12-27

(72)

Inventor

Frejdlina Rufina Grigor'EvnaKononovich Margarita MikhajlovnaPastukhova Tat'Jana JakovlevnaGribov Vladimir Ivanovich

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Nauchno-Issledovatel'Skij I Proektnyj Institut Titana I Magnija"

METHOD OF PRODUCING CALCIUM SULPHATE DIHYDRATE Russian patent published in 2011 - IPC C01F11/46

Abstract RU 2437835 C1

FIELD: chemistry.

SUBSTANCE: method of producing calcium sulphate dihydrate involves treating calcium-containing material with concentrated sulphuric acid and filtering the obtained suspension. The concentrated sulphuric acid used is spent acid from chloride compressors containing 85-93% H₂SO₄. The calcium-containing material used is an aqueous suspension of calcium hydroxide containing 50-60 g/dm³ CaO.

EFFECT: invention enables to obtain gypsum with low content of impurities while improving environmental friendliness due to neutralisation of spent sulphuric acid.

2 cl, 1 ex

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RU 2 437 835 C1

Authors

Frejdlina Rufina Grigor'Evna

Kononovich Margarita Mikhajlovna

Pastukhova Tat'Jana Jakovlevna

Gribov Vladimir Ivanovich

Dates

2011-12-27—Published

2010-05-24—Filed