USE OF N-METHYL-MORPHOLINE-3-ONE IN THE EXTRACTIVE DISTILLATION OF HYDROCARBONS

摘要

ABSTRACT OF THE DISCLOSURE:The invention is concerned with a method of separating adiolefin from a mixture thereof with other hydrocarbons by anextractive distillation. The method of the invention comprisesfeeding a stream of the mixture of hydrocarbons to a firstextractive distillation column, feeding a stream of solventcomprised of N-methyl-morpholine-3-one to the first extractivedistillation column, withdrawing the other hydrocarbons and aminor quantity of the diolefin from the head of the firstextractive distillation column, recovering the solvent and thebalance of the diolefin from the first extractive distillationcolumn as bottom product, feeding the bottom product from thefirst extractive distillation column to a second extractive dis-tillation column, recovering the diolefin in the bottom productof the first extractive distillation column from the secondextractive distillation column as head product, withdrawing thesolvent in the bottom product of the first extractive distilla-tion column from the second extractive distillation column asbottom product, and recycling the bottom product from the secondextractive distillation column to the first extractive distilla-tion column. The method of the invention is particularly use-ful for the separation of butadiene from a mixture of C4 hydro-carbons, or of isoprene from a mixture of C5 hydrocarbons.