Paraffin removal from C4 containing streams
AssigneeLyondell Chemical Technology, L.P.
InventorsMajid Keyvani, Gary A. Sawyer, Arsam Behkish
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Abstract
The present disclosure relates to processes for the removal of paraffins. The processes generally include providing a C4 containing stream including isobutylene, 1-butene, 2-butene, n-butane and isobutane, introducing the C4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process is selected from extractive distillation utilizing a solvent including an organonitrile, passing the C4 containing stream over a semi-permeable membrane and combinations thereof; and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream includes less than 5 wt. % paraffins.
Claims18
A 1-butene production process comprising:
- introducing a C4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process comprises the step:
- (a) extractive distillation utilizing a solvent comprising an organonitrile;
- and
- (b) optionally, passing the C4 containing stream over a semi-permeable membrane;
- and
- wherein the solvent is diluted with water prior to extractive distillation with an amount of water sufficient to provide a solvent mixture comprising from 1 wt. % to 15 wt. % water;
- and
- isomerizing at least a portion of the 2-butene present in the olefin rich stream to 1-butene to form an isomerization product stream comprising at least 80 wt. % 1-butene
- wherein the isomerizing at least a portion of the 2-butene present in the olefin rich stream to 1-butene occurs in the presence of an isomerization catalyst comprising a potassium promoted alpha aluminum catalyst.
A process for the removal of paraffins:
- providing a C4 containing stream comprising isobutylene, 1-butene, 2-butene, n-butane and isobutane:
- introducing the C4 containing stream into a paraffin removal process to form an olefin rich stream, wherein the paraffin removal process comprises the step of extractive distillation utilizing a solvent comprising an organonitrile, wherein the solvent is diluted with water prior to extractive distillation with an amount of water sufficient to provide a solvent mixture comprising from 1 wt. % to 15 wt. % water;
- and recovering the olefin rich stream from the paraffin removal process, wherein the olefin rich stream comprises less than 5 wt. % paraffins
- wherein the olefin rich stream is introduced into an isomerization process, and the isomerization process comprises isomerizing at least a portion of the 2-butene present in the olefin rich stream to 1-butene in the presence of an isomerization catalyst comprising a potassium promoted alpha aluminum catalyst.
Dependencies are inferred from the claim text.