Substrate for soil improvement having a water-storing property, method for producing same, and use thereof

摘要

The invention relates to a method for producing a lignin-based substrate for soil improvement having a water-storing property, characterized by the following steps: providing lignin, oxidizing the lignin in either an aqueous alkaline suspension or a pH-neutral aqueous suspension, the pH-neutral aqueous suspension being converted into an alkaline substance after the lignin has been oxidized, cross-linking the lignin in an aqueous alkaline medium using multifunctional compounds, and neutralizing, drying, and comminuting the lignin.

主权项

1. Substrate for soil improvement with water-storing property comprised of lignin, characterized in that the lignin is modified at the aromatic structures as well as at the aliphatic structures by introduction of oxygen-functional groups, the oxygen-functional groups introduced by oxidation of the lignin with hydrogen peroxide or a Fenton system, the latter comprised of hydrogen peroxide and an Fe(II) salt, or a mixture of hydrogen peroxide and an Mn(II) salt, and in that the lignin is crosslinked by bifunctional crosslinking substances at the aliphatic and phenolic hydroxy groups introduced by oxidation.