METHOD AND CATALYST FOR THIOPHEN PREPARATION Russian patent published in 2008 - IPC B01J37/02 B01J35/08 B01J27/47 B01J27/55 B01J27/138 B01J27/125 C07D333/10 

FIELD: chemistry.

SUBSTANCE: thiophen and its homologues are used in chemical industry and pharmacology for synthesis of polyorganosiloxanes, herbicides, physiologically active substances and aroma materials. Two catalyst types for thiophen preparation from sulfur-containing substances and C₄-hydrocarbons are described. First type catalysts contain magnesium chromate and/or cupric chromate, aluminium oxide and probably magnesium and/or potassium and/or lanthanum oxides; second type catalysts have general formula tMg_1-nCu_nCr₂O₄-xMgO-yK₂O-zLa₂O₃/Al₂O₃, where t =5-25 Wt%; n=0-1 Wt%; x = 0-3.2 Wt%; y = 0-2 Wt%; z =0-10 Wt%; Al₂O₃ - the rest. Process is carried out at volume rate 400-1800 hr^-1 and temperature 400-600°C, organic disulphides were used as sulfur-containing substances.

EFFECT: high yield of thiophen.

7 cl, 39 ex, 4 tbl