HYDROISOMERISATION OF BUTENE DOUBLE BONDS Russian patent published in 2009 - IPC C07C5/25 C07C6/04 C07C11/06 C07C11/08 B01J8/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of converting a C4 stream, containing 1-butene and 2-butene, preferably into 2-butene, involving: mixture of the said C4 stream with the first hydrogen stream to form the input stream, hydroisomerisation of the said input stream in the presence of first hydroisomerisation catalyst, so as to convert at least part of the said 1-butene to 2-butene and obtain an output hydroisomerisation product, separation of the output hydroisomerisation product in a catalytic distillation column, with a top end and a bottom end, to obtain a mixture of 1-butene at the said top end, a top output stream which contains isobutene and isobutylene, and a bottom stream which contains 2-butene, and hydroisomerisation of the said mixture of 1-butene at the said top end of the catalytic distillation column using a second hydroisomerisation catalyst to obtain additional 2-butene in the said bottom stream; where location of the said second hydroisomerisation catalyst in the top section of the column as a separate reaction zone is chosen to achieve maximum concentration of 1-butene, under the condition that, the hydroisomerisation stage with participation of the second isomerisation catalyst does not take place. The invention also relates to an apparatus for realsing this method and a method of producing propylene from a C4 stream.

EFFECT: selective hydrogenation of 1-butene to 2-butene which is more efficient than existing technologies.

30 cl, 7 dwg, 4 tbl, 2 ex