US 2020/0369577 A1Published application

Production of fertilizers from landfill gas or digester gas

AssigneeHaldor TopsøE A/S

InventorsNiklas Bengt JAKOBSSON, Kurt Agerbæk CHRISTENSEN, Janus Emil MÜNSTER-SWENDSEN, Kresten EGEBLAD

Life of this patent

Estimating the term…

Loading patent…

Abstract

In a method for the production of a fertilizer from the sulfur and ammonia content in a feed gas, including steps of (a) combustion of the H2S-rich gas in air to convert H2S to SO2, (b) formation of ammonium hydrogen sulfite (AHS) by absorption of SO2 and NH3 in water, and (c) reaction of the AHS from step (b) with H2S and NH3 to form an aqueous solution of ammonium thiosulfate (ATS), reaction (a) is carried out in a catalytic reactor as a selective oxidation of the H2S content to SO2 over a selective catalyst having one or more metal oxides, in which the metal is selected from the group of V, W, Ce, Mo, Fe, Ca and Mg, and one or more supports taken from the group of Al2O3, SiO2, SiC and TiO2, optionally in the presence of other elements in a concentration below 1 wt %.

Claims17

Dependent claims

A method for the production of a fertilizer from the sulfur and ammonia content in a feed gas such as landfill gas, digester gas, off-gas from geothermal power production or coke oven gas, said method comprising the steps of:

(a) combustion of the H2S-rich gas with oxygen to convert H2S to SO2,
(b) formation of ammonium hydrogen sulfite (AHS) by absorption of SO2 and NH3 in water, and
(c) reaction of the AHS from step (b) with H2S and NH3 to form an aqueous solution of ammonium thiosulfate (ATS),
wherein reaction (a) is carried out in a catalytic reactor as a selective oxidation of the H2S content to SO2 over a selective catalyst consisting of one or more metal oxides, in which the metal is selected from the group consisting of V, W, Ce, Mo, Fe, Ca and Mg, and one or more supports taken from the group consisting of Al2O3, SiO2, SiC and TiO2, optionally in the presence of other elements in a concentration below 1 wt %.

1 more element

Dependencies are inferred from the claim text.