Substrate for Soil Improvement Having a Water-Storing Property, Method for Producing Same, and Use Thereof

摘要

In a method for producing a substrate for soil improvement with water-storing property on the basis of lignin, lignin is provided and oxidized alternatively in an aqueous alkaline or a pH-neutral aqueous suspension, wherein the pH-neutral aqueous suspension after oxidation of the lignin is converted into an alkaline medium. The lignin is cross-linked in an aqueous alkaline medium by multi-functional compounds. Subsequently, the lignin is neutralized, dried, and comminuted. The produced lignin is used as a substrate for improvement of soil properties in that the substrate is used as a water storage that, compared to water storages of non-modified technical lignins, exhibits a significantly higher water adsorption capacity or swelling capacity.

主权项

1. A method for producing a substrate for soil improvement with water-storing property on the basis of lignin, characterized by the steps
providing lignin, oxidation of lignin alternatively in an aqueous alkaline or a pH-neutral aqueous suspension wherein the pH-neutral aqueous suspension after oxidation of the lignin is converted into an alkaline medium, crosslinking of the lignin in an aqueous alkaline medium by use of multi-functional compounds, neutralizing, drying, and comminuting the lignin.