Method of Removing Nitrous Oxide

a technology of nitrous oxide and nitrous oxide, which is applied in the direction of dispersed particle separation, separation processes, chemistry apparatus and processes, etc., can solve the problems of gas mixture becoming flammable and unsafe to handle, nsub>2/sub>o can accumulate in dangerous levels, and loss of hsub>2/sub>
US20080247928A1Inactive Publication Date: 2008-10-09BASF AG
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
BASF AG
Publication Date
2008-10-09
Estimated Expiration
Not applicable · inactive patent

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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 gasses and the water vapor are flowed away from the reactor in a vent gas stream enabling recycling of the gasses. 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.
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Description

FIELD OF THE INVENTION

[0001] The present invention generally relates to a method of removing nitrous oxide. More specifically, the present invention relates to a method of using pressure swing adsorption and a nitrous oxide adsorbent material for removing the nitrous oxide in a vent gas formed from a synthesis of hydroxylamine and recycling remaining gases in the vent gas.BACKGROUND OF THE INVENTION

[0002] Nitrous oxide gas, (N2O), is produced as a by-product in a synthesis of hydroxylamine. Hydroxylamine may be used to form a caprolactam that can be used to form nylon 6. Nylon 6 is an important polymer that is used throughout the world in carpets, apparel, upholstery, auto parts, and in many other products.

[0003] Typically, hydroxylamine is formed from partially hydrogenating nitric oxide gas (NO) with hydrogen gas (H2) in an aqueous medium including nitrogen gas (N2) as an inert gas. Mixing the NO with the H2 and the N2 forms hydroxylamine in addition to a variety of by-products. The ...

Claims

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