Patent · US Expired

Continuous method for separating a C4 cut

US7462277B2 · kind B2 · utility

12Cited by

2References

22Claims

0Family size

Assignee

BASF SE

Inventors

Till Adrian · Frankenthal (Pfalz), DE
Thomas Hill · Ludwigshafen, DE
Klaus Kindler · Speyer, DE
Bernd Heida · Haßloch, DE

Key dates

Filing date	Jul 22, 2003
Grant date	Dec 9, 2008
Priority date	—
Expiry date	Dec 30, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/10
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

In a continuous process for fractionating a C4 fraction (C4) by extractive distillation using a selective solvent (LM) in an extractive distillation column (EDK), it is proposed that a dividing wall (TW) is installed in the longitudinal direction in the extractive distillation column (EDK) to form a first region (A), a second region (B) and a lower combined column region (C) and a top stream (C4H10) comprising the butanes is taken off from the first region (A), a top stream (C4H8) comprising the butenes is taken off from the second region (B) and a stream (C4H6) comprising the hydrocarbons from the C4 fraction which are more soluble in the selective solvent (LM) than are the butanes and the butenes is taken off from the lower combined column region (C).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.