Patent · US Expired

Method for the production of urea from natural gas

US7674932B2 · kind B2 · utility

3Cited by

3References

3Claims

0Family size

Assignee

Lurgi GmbH · DE

Inventors

William Davey · Frankfurt am Main, DE
Thomas Wurzei · Oberursel, DE

Key dates

Filing date	Aug 18, 2005
Grant date	Mar 9, 2010
Priority date	—
Expiry date	Oct 11, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/52
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Disclosed is a method for the production of urea from natural gas, wherein a) natural gas undergoes partial oxidation or autothermal reformation with a gas containing oxygen in a first step and the raw synthesis gas thus arising, consisting essentially of carbon monoxide, carbon dioxide, methane and hydrogen, can be transformed by catalytic conversion of CO and H2O to form CO2 and H2, whereupon carbon monoxide and methane are removed in a multistep gas cleaning process and the hydrogen is converted into ammonia upon addition of nitrogen, and subsequently, b) the ammonia is recombined with the previously separated carbon dioxide in a second step and the ammonia is thus fully converted into urea.

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