BLOWING AGENT FOR FLOTATION OF MINERAL PRODUCTS AND METHOD FOR THE PRODUCTION THEREOF

WIPO Patent Application WO/2001/010561

A1

The invention relates to a method for production of a blowing agent from dimethyl(isopropenyethyl)carbinol containing materials that stabilize flotation. The composition of the blowing agent, in weight per cent, is the following: dimethyl(isopropenyethyl)carbinol - 95.0 - 98.0 %; tetramethylbutindiole - 0.1 - 1.5 %; diisopropenylacetylene - 0.1 - 1.0 %; and 2,5-dimethyl-1,4-hexadien-3-one - 1.5 - 2.5 %. The inventive method consists in treating tetramethylbutindiol with an aqueous solution of an acid in the presence of free radical polymerization inhibitors, at the boiling point of the reactive mixture, and in performing simultaneously steam stripping of the blowing agent while maintaining a constant volume of the reaction mixture by reinjecting the aqueous layer (after extraction) into the reaction mixture.

SCHELKUNOV SERGEI ANATOLIEVICH (RU)
MALYSHEV OLEG ANATOLIEVICH (RU)
DUBOVSKY EVGENY MIKHAILOVICH (KZ)
MAMONTOV YAKOV YAKOVLEVICH (RU)
MAXIMOV ALEXANDR ANATOLIEVICH (RU)

PCT/RU1999/000281

February 15, 2001

August 10, 1999

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ZAKRYTOE AKTSIONERNOE OBSCHEST (RU)
SCHELKUNOV SERGEI ANATOLIEVICH (RU)
MALYSHEV OLEG ANATOLIEVICH (RU)
DUBOVSKY EVGENY MIKHAILOVICH (KZ)
MAMONTOV YAKOV YAKOVLEVICH (RU)
MAXIMOV ALEXANDR ANATOLIEVICH (RU)

B03D1/008; B03D101/04; (IPC1-7): B03D1/008; B01F17/38

RU94028124A	1997-05-20
US3595390A	1971-07-27
US3909399A	1975-09-30
US4606818A	1986-08-19
GB2163976A	1986-03-12
CA1173980A	1984-09-04

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