Patent · US Expired

Purification of ammonia by distillation

US7001490B2 · kind B2 · utility

34Cited by

5References

13Claims

0Family size

Assignee

BASF SE

Inventors

Karl-Heinz Wostbrock · Bad Kötzting, DE
Gerd Kaibel · Lampertheim, DE
Christian Tragut · Monsheim, DE
Gabriele Anken · Lambsheim, DE

Key dates

Filing date	Jan 24, 2001
Grant date	Feb 21, 2006
Priority date	—
Expiry date	Nov 20, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S203/20
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Crude ammonia is separated into a low boiler fraction, a high boiler fraction and an intermediate-boiling pure fraction by continuous fractional distillation in a distillation apparatus configured either as a dividing wall column or as a system of thermally coupled distillation columns. In the process of the present invention, the low boiler fraction is taken off at the top of the distillation apparatus. The intermediate-boiling pure fraction is obtained at a side offtake which is preferably provided with droplet precipitators. In addition, the gas loading of the distillation column is restricted so that the operating pressure is in the range from 2 to 30 bar and the F factor does not exceed 2.0 Pa0.5.

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