Reducing nitrosamine content of amine compositions
A composition, nitrosamine technology, applied in the direction of chemical/physical process, chemical/physical/physical chemical process, separation method, etc., can solve the problems of difficult, expensive, and overall cost-effective reduction of waste liquid
Inactive Publication Date: 2014-11-12
DOW GLOBAL TECH LLC
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Problems solved by technology
However, this leads to two disadvantages
First, it is difficult and expensive to dispose of the resulting large volumes of waste liquid due to its corrosive content
Second, the cost of fresh gas treatment chemicals is quite high, so the overall cost-effectiveness of the method is reduced
However, selective removal of nitrosamines relative to the desired amine is problematic because the two materials are extremely soluble in each other as well as in aqueous solutions
Method used
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[0071] 1000ppmw of N-nitrosamine was added for CO capture 2 aqueous amine solvent. The solvent is fed into a chamber containing a UV light source. Light source has 30,000mW / cm at 254nm 2 of irradiance. figure 2 The changes in amine and nitrosamine content as a function of UV exposure time are shown in . figure 2 showed that exposure to UV light degraded the nitrosamines but had minimal effect on the initial amine concentration based on GC analysis of the solutions.
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The present invention provides strategies for reducing the nitrosamine content of amine compositions that are contaminated with one or more nitrosamines. The present invention is based apart upon the appreciation that irradiating contaminated amine compositions with a suitable fluence of electromagnetic energy, such as ultraviolet energy, is able to selectively decompose the nitrosamine content relative to the amine content. This allows the amine content of the treated compositions to be preserved. As a consequence, the principles of the present invention are particularly useful for regenerating amine absorbents. Reducing the nitrosamine content so easily also facilitates disposal, further processing, or other desired handling of amine compositions.
Description
field of invention [0001] The present invention relates to purifying amine compositions, especially aqueous amine compositions, for use as absorbents for the removal of acidic contaminants from gaseous mixtures such as flue gas, natural gas, and the like. More specifically, the aqueous composition is irradiated with electromagnetic energy to selectively decompose the nitrosamine content relative to the amine content to regenerate a purer amine composition. Background of the invention [0002] It is desirable to be able to remove acidic contaminants from a variety of fluids. For example, natural gas contains many acidic gaseous components, such as hydrogen sulfide and carbon dioxide, as well as water vapor, which are desirably removed from the gas before it is transported and / or used. Combustion gases, such as flue gases, may also contain carbon dioxide, sulfur dioxide, nitrogen oxides, and / or other acidic pollutants that are desired to be removed. [0003] These components...
Claims
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IPC IPC(8): B01D53/14
CPCB01D53/1462B01D53/1456B01D53/1425B01D2252/204B01D53/007B01D2259/804B01D53/1475B01D53/1481B01D53/1493B01J19/123
Inventor E·J·克林科
Owner DOW GLOBAL TECH LLC