Method for the preparation of low molecular weight alkali metal huminates

US4921840A · kind A · utility

Assignee

• Rutgerswerke Aktiengesellschaft · DE

Inventors

• Bernhard Seubert · Edingen-Neckarhausen, DE
• Helmut Beilharz · Schriesheim, DE
• Werner Fickert · Mannheim, DE
• Gunter Jeromin · Heidelberg, DE
• Ulrich Spitaler · Freinsheim, DE

Key dates

• Filing date: Mar 1, 1988
• Grant date: May 1, 1990
• Expiry date: Mar 1, 2008

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61P43/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to a synthetic preparation of alkali metal salts of low molecular weight humic acids wherein multi-valent phenols are oxidized in a weakly alkaline aqueous medium at a temperature in the range of 15.degree. to 40.degree. C. Subsequently, the reaction mixture is adjusted to a pH value ranging between 6.2 and 7.2 and/or buffered. The low molecular alkali metal huminate is then purified through purification means including preparatory chromotography, ultra-filtration, ultra-centrifugation, or electrodialysis and separated from undesirable by-products.