Technology

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 1^st 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 2^nd 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 2^nd 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 2^nd 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 3^rd Distillation Column.
4. Obtaining from the 3^rd 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.