Patent · US Active

Process for preparing melamine

US9598379B2 · kind B2 · utility

0Cited by

3References

9Claims

0Family size

Assignee

BASF SE

Inventors

Andreas Kern · Roth, DE
Hans-Ulrich Pröbstle · Frankenthal (Pfalz), DE
Tilo John · Speyer, DE
Wolfgang Steiner · Friedelsheim, DE
Heiko Maas · Mannheim, DE

Key dates

Filing date	Oct 14, 2008
Grant date	Mar 21, 2017
Priority date	—
Expiry date	Sep 23, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D251/62
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for preparing melamine by converting urea in the presence of a solid catalyst in one reactor or in a plurality of reactors connected in series in the temperature range from 370° C. to 430° C., cooling and filtering the gas formed in the urea conversion, removing the melamine by desublimation and recycling a portion of the gas present after the melamine removal (“cycle gas”) into the reactor or the reactors, which comprises performing all of the above stages at a pressure in the range from 4 bar abs. to 10 bar abs.

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