Patent · US Expired

Method for producing melamine

US6815545B2 · kind B2 · utility

8Cited by

1References

6Claims

0Family size

Assignee

Agrolinz Melamin GmbH · AT

Inventors

Hartmut Bucka · Staprijk, AT
Gerhard Coufal · Leonding, AT
Ferdinand Koglgruber · Linz, AT

Key dates

Filing date	Oct 7, 2003
Grant date	Nov 9, 2004
Priority date	—
Expiry date	Oct 7, 2023

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J2219/00078
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for the production of melamine by pyrolysis of urea in a high-pressure reactor having a vertical central pipe is provided. The melamine flows upwards into the reactor from below, mixes in the lower part of the reactor with a urea melt, and optionally NH3, introduced into the reactor from below, and emerges from the central pipe in the upper part of the central pipe. Part of the melamine formed flows downward in the annular space between the central pipe and reactor wall, and the remainder is expelled for further work-up. The off-gases are removed at the top of the reactor. A reactor for carrying out the process is also provided.

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