Haldor Topsoe A/s

Troels Dahlgaard Stummann

Niklas Bengt Jakobsson

Jens R Rostrup-Nielsen

Jacob Hjerrild Zeuthen

Rasmus Trane-Restrup

Kresten Egeblad

Niels Ulrik Andersen

Madhanakrishnan Janardhanan

Oxygen is removed from a gas feed such as a landfill gas, a digester gas or an industrial COoff-gas by heating the feed gas, optionally removing siloxanes and silanols from the heated feed gas, optionally removing part of the sulfur-containing compounds in the heated feed gas, injecting one or more reactants for oxygen conversion into the heated feed gas, carrying out a selective catalytic conversion of any or all of the volatile organic compounds (VOCs) present in the gas, including sulfur-containing compounds, chlorine-containing compounds and any of the reactants injected, in at least one suitable reactor, and cleaning the resulting oxygen-depleted gas. The reactants to be injected comprise one or more of H, CO, ammonia, urea, methanol, ethanol and dimethyl ether (DME).

Method for the removal of oxygen from an industrial gas feed

The present disclosure relates to a reactor and a method of operation for an exothermal process being catalyzed by a catalytically active material receiving a reactant gas and providing a product gas, in which said exothermal process has a heat development having a potential for thermally degrading said catalytically active material, and which exothermal process operates at a temperature at which the reactants and at least 80% or all of the products are present as gases, said method comprising the steps of a) directing the reactant gas to a first zone of a material catalytically active in the exothermal process producing an first product gas, and b) directing the first product gas to a second zone of a material catalytically active in the exothermal process producing a product gas, with the option of fully or partially by-passing either said first zone or said second zone, while directing a non-condensing gas stream having a temperature at least 50&#xb0; C. lower than the product gas to said by-passed zone, wherein the choice of by-passing said zone is made based on the time of operation or a process parameter reflecting the catalytic activity of the zone of catalytically active material which is not by-passed with the associated benefit of reducing the extent of thermal deactivation of the catalytically active material, and thus increasing the overall lifetime of the catalytically active material.

Process and reactor for exothermal reaction

A process for treating a dust containing, gaseous or liquid feed stream in a reactor containing a plurality of particle beds, which have the capability, once the pressure drop across a bed has reached a maximum allowable level, to distribute most of the feed stream to a point directly upstream of each of the subsequent beds in a series, stepwise manner. The beds contain particles in the form of pellets, cylinders, granules, rings, or mixtures thereof, and at the end of an operation period, the primary fraction of the feed flow is directed through the downstream-most bed in the reactor. By providing for removal of dust in each of the beds, the process enables the reactor to operate with a conventional pressure drop profile, but for an extended on-stream period of time.

Process and apparatus for the removal of dust in a reaction zone

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Copenhagen, Denmark

Troels Dahlgaard Stummann