Patent · US Active

Hydrothermal carbonization of sludge including recycling of a wet-oxidized fraction

US11999921B2 · kind B2 · utility

0Cited by

4References

13Claims

0Family size

Assignee

C-GREEN AB · SE

Inventors

Fredrik Lundqvist · Järfälla, SE
Erik Oden · Stocksund, SE
Fredrik Ohman · Gävle, SE

Key dates

Filing date	Dec 11, 2018
Grant date	Jun 4, 2024
Priority date	—
Expiry date	Aug 24, 2039

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E50/30
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

There is provided a method of hydrothermal carbonization of a sludge, comprising the steps of: preheating the sludge to obtain a preheated sludge; mixing the preheated sludge with a wet-oxidized fraction to obtain a reaction mixture; subjecting the reaction mixture to hydrothermal carbonization (HTC) in a reactor to obtain a HTC-treated sludge; separating a fraction from the HTC-treated sludge; and mixing the fraction with an oxidizing agent, such as oxygen gas, to obtain the wet-oxidized fraction, wherein the temperature of the fraction before the wet oxidation is at least 15° C. higher than the temperature of the preheated sludge. A corresponding system is also provided.

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