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Saipem 1-Butene
/ Saipem SpA
Snamprogetti 1-Butene
Selective Hydrogenation

Process for the Recovery of Polymerization grade 1-Butene from a C4 Fraction free from Isobutene comprising the Stages of:

  1. Sending the C4 Fraction to a 1st Distillation Column to obtain a Top Stream essentially containing Isobutane and a Bottom Stream containing the Residual Components
  2. Sending the Stream of Residual Components to a 2nd Distillation Column, obtaining a Top Stream of 1-Butene at a purity level of from 80 to 95% and a Bottom Stream comprising the high boiling Compounds, n-Butane and 2-Butenes, characterized in that the Top Stream from the 2nd Distillation Column is fed to a Selective Hydrogenation Unit (SHU).
  3. Selectively Hydrogenating the Butadiene and the Acetylenic derivatives comprised in the Top Stream from the 2nd Distillation Column, such Compounds being reduced to a concentration comprised within the range from 30 to 200 ppm, the Stream originating from the SHU being finally fed to a 3rd Distillation Column.
  4. Obtaining from the 3rd Distillation Column a Top Stream made of Polymerization grade 1-Butene and a Bottom Stream made of n-Butane and 2-Butenes with reduced amounts of 1-Butene.

Figure 1 - Process Block Flow Diagram.

1. C4 Hydrocarbon stream, 2. Methanol stream, 3. MTBE produced in unit 16, 4. C4 Stream essentially free from Isobutene, 16. Etherifying unit,  18. 1st Distillation column operated at about 14 atm absolute, 5. Top stream essentially comprising Isobutane, 6. Residual stream fed to second distilation column 19, 19. Second distillation column operated at about 6 atm absolute,  7. Top stream from second distillation column fed to hydrogenation unit 17, 8. Bottom stream containing heavy products, 17. Hydrogenation unit, 9. Hydrogen line feeding hydrogen to hydrogenation unit 17, 10. Hydrogenated stream fed to a fractionation column, 11. Hydrogenation unit discharge stream essentially consisting of excees hydrogen and 1-butene, 20. Fractionation column operated at a pressure of about 7 atm absolute, 12. Fractionated top stream  consisting of uncondensable matter and butene-1, 13. Stream obtained from the 10th plate from the top of polymerisation grade 1-butene, 14. Fractionated bottom stream substantialy consisting of n-butane and 2-butene, 15. Steam, which is the sum of streams 5, 8 and 14.  

Source: Renzo Comiotto, Bruno de Maglie, IT2229483A, Priority: 28th Jul 1983, Procedimento per il recupero di butene-1 grado polimerizzazione.

System Info

Updated by
UserPic  Kokel, Nicolas
5/7/2024 3:00 PM
Added by
UserPic  Kokel, Nicolas
2/9/2022 7:45 AM



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Block Flow Diagram of Saipem 1-Butene Process worldwide.espacenet.com/patent/search/family/011194295/publication/IT1194351B?q=IT1194351B
Block Flow Diagram of Saipem 1-Butene Process worldwide.espacenet.com/patent/search/family/011194295/publication/IT1194351B?q=IT1194351B
Entity Site (Country) Asset (Plant)
YNCC Yeosu Butene-1 Production