PRODUCTION OF THIOPHENE AND ALKYLTHIOPHEN ES FROM HYDROCARBONS AND HYDROGEN-SULFIDE BY CATALYTIC METHODS

Production of thiophene and alkylthiophenes by interaction of acetylen e, alkanes C4 - C8, alkenes and alkadienes C4 - C6 with hydrogen sulfi de in presence of oxides, sulfides metals and their mixtures are revie wed. The various conditions of catalysts investigation in fixed and fl uidized bed systems are examined. The equilibrium yields of thiophenes from C4 - C6 hydrocarbons and hydrogen sulfide are compared with expe rimental data. The dehydrocyclization of C6 - C8 hydrocarbons with for mation of aromatics take place in addition to heterocyclization of the se hydrocarbons in the presence of hydrogen sulfide into alkylthiophen es. The mechanism of interaction of C4 - C5 hydrocarbons with hydrogen sulfide which have been studied by kinetic isotope method is discusse d. The phisico-chemical characteristics of active chromium containing oxide catalysts for heterocyclization and industrial production of thi ophene are considered. Bibliography - 63 references.