Organic fertilizer and method of manufacturing it

US5720792A · kind A · utility

Assignee

• Technische Universitaet Dresden · DE

Inventors

• Klaus Fischer · Speyer, DE
• Joachim Katzur
• Rainer Schiene · Rabenau, DE

Key dates

• Filing date: Feb 16, 1996
• Grant date: Feb 24, 1998
• Expiry date: Feb 16, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C05C11/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns a high-grade, long-duration, organic fertilizer and a method of manufacturing it by the oxidative ammonolysis of industrial lignin. The fertilizer contains nitrogen in the form of ammonium compounds, normally hydrolyzable amides and more strongly bound organic nitrogen. The proportion of more strongly bound organic nitrogen is 55 to 85%, preferably 65 to 80%, relative to the total nitrogen content of the fertilizer. The manufacturing process uses industrial lignin precipitated under alkaline conditions from alkaline waste liquors, extracts or solutions. Preliminary tests have confirmed that this process gives a natural-like, high-grade, long-duration fertilizer similar to humus in character and with surprisingly good environmental compatibility.