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>

Inactive Publication Date: 2008-10-09
BASF AG
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Problems solved by technology

However, if the gas mixture and the H2 and NO are recycled, a level of the N2O can accumulate in the gas mixture to dangerous levels.
If the level of N2O in the gas mixture becomes too high, the gas mixture becomes flammable and unsafe to handle.
If the level of N2O reaches a predetermined upper limit, the gas mixture is discarded, resulting in

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  • Method of Removing Nitrous Oxide
  • Method of Removing Nitrous Oxide
  • Method of Removing Nitrous Oxide

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[0057]Hydroxylamine can be formed in a reactor (26) by combining nitric oxide gas (NO), nitrogen gas (N2), and hydrogen gas (H2) in an aqueous medium to partially hydrogenate the NO. As a result, nitrous oxide gas (N2O) is formed as a gaseous by-product. The N2O and H2O, in addition to unused N2, H2, and NO, are preferably removed from the reactor in a first vent gas (1).

[0058]The first vent gas (1) typically includes approximately 67% H2, 14% NO, 9% N2, 4% H2O, 8% N2O, and a trace amount of other gasses such as methane, CO2 and CO. However, the following examples utilize synthetic mixtures of the aforementioned gasses representative of a typical first vent gas (1). The synthetic mixtures of the gasses are hereafter referred to as “mixtures.”

[0059]A first pressure swing adsorption (PSA) system (29) is employed and utilizes a first mixture of N2, N2O, and H2O. A second PSA system (65) is also employed and utilizes second and third mixtures. The second mixture includes N2 and N2O, whi...

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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.

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 ...

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/047B01D53/053B01D53/261B01D2257/402B01D2257/404B01D2257/80B01D2259/40001B01D2259/40052B01D2259/40081B01D2259/402B01D2259/404Y02C20/10
Inventor VIRANI, NAHEED N.
Owner BASF AG
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