METHOD FOR MAKING HEAT-RESISTANT SULPHOCATION CATALYST Russian patent published in 2009 - IPC B01J31/06 B01J31/10 B01J35/04 C08F257/02 

FIELD: chemistry.

SUBSTANCE: invention refers to making heat-resistant sulphocation catalysts. There is disclosed method for making heat-resistant sulphocation catalysts containing aromatic rings chemically combined with solid polymer base, at least two groups -SO₂OH, by sulphonation of aromatic rings of polymer base followed by desulfonation at higher temperature of those aromatic rings having only one group -SO₂OH whereat heat-resistant polymer base is sulphonated, while aromatic rings are sulphonated in two or more stages with gradually increasing sulphonation hardness. The first stage involves soft sulphonation with aqueous sulphuric acid solution concentrated 95 wt % and more at temperature 90°C and less, preferentially 70°C and less. The last stage implies sulphonation with aqueous sulphuric acid solution concentrated 90 wt % and more or with oleum with SO₃ concentrated 1 to 30 wt % higher than chemically combined in acid. The catalyst is sequentially washed by dissolved sulphuric acid solution, then by water. Thereafter it contacts at temperature 150 to 200°C with an inert solvent not containing groups neutralising -SO₃OH groups and introduced in amount required to remove groups -SO₂OH from the aromatic rings containing one group -SO₂OH only.

EFFECT: making heat-resistant catalyst of required dimension and/or shape.

8 cl, 1 tbl, 5 ex