US 8,075,672 B2 · Method of removing nitrous oxide

Abstract

Hydroxylamine is formed in a reactor through a partial hydrogenation of nitric oxide gas (NO) with hydrogen gas (H2) in an aqueous medium with nitrogen gas (N2) as an inert gas. The formation of the hydroxylamine forms nitrous oxide gas (N2O). The gases and the water vapor are flowed away from the reactor in a vent gas stream enabling recycling of the gases. The N2O is removed from the vent gas stream to reduce flammability. Once the N2O is removed, the NO, H2, and N2 are recycled and re-used in the reactor to form additional hydroxylamine. The N2O removed from the vent gas stream is of high purity and can be commercially sold or economically discarded.

Claims30

Dependent claims

A method of removing nitrous oxide from a vent gas comprising the nitrous oxide and at least one other gas, said method comprising the steps of:

flowing the vent gas through a nitrous oxide adsorbent material comprising particles such that the nitrous oxide is adsorbed onto the particles;
forming a buffer zone comprising nitrogen adjacent to the nitrous oxide adsorbent material;
flowing additional nitrous oxide through the nitrous oxide adsorbent material to displace the other gas;
and
desorbing the nitrous oxide from the nitrous oxide adsorbent material,
wherein the buffer zone is disposed between the additional nitrous oxide and the vent gas.

3 more elements

Dependencies are inferred from the claim text.

Method of removing nitrous oxide

Life of this patent

Method of removing nitrous oxide

Life of this patent

Abstract

Claims30