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Method for purification of carbon dioxide using liquid carbon dioxide

a carbon dioxide and liquid carbon dioxide technology, applied in gas treatment, lighting and heating apparatus, inorganic chemistry, etc., can solve the problems of large amount of clean water used, waste, and ineffective removal from the stream by water scrubbers, so as to improve the absorption process, increase the yield of carbon dioxide, and high carbon dioxide yield

Inactive Publication Date: 2014-07-10
UNION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for removing several contaminants from a carbon dioxide stream, such as NOx's, from a flue gas. The method involves a single operating step and maintains a high carbon dioxide yield. The invention also increases the yield of carbon dioxide by minimizing the waste carbon dioxide. The method involves absorbing the contaminants in liquid carbon dioxide and then evaporating the excess heat to remove the contaminants. The pressure in the column is typically between 10 and 40 bar, and the temperature range is 5 to 25°C. The method is a compromise between the purity and carbon dioxide yield, and the flow of the absorbent liquid carbon dioxide is optimized to minimize the waste carbon dioxide absorbent. The invention also provides a means for re-evaporating the contaminant-rich liquid carbon dioxide to further reduce the waste.

Problems solved by technology

The drawbacks of using a water scrubber is the large amounts of clean water used and wastewater formed.
However, if the gas comprises impurities, which are heavily dissolved in carbon dioxide, i.e., primarily non-polar organic compounds and compounds having a boiling point higher than the boiling point of carbon dioxide under the prevailing conditions, these will not be effectively removed from the stream using a water scrubber.

Method used

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  • Method for purification of carbon dioxide using liquid carbon dioxide
  • Method for purification of carbon dioxide using liquid carbon dioxide
  • Method for purification of carbon dioxide using liquid carbon dioxide

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Embodiment Construction

[0054]According to the present invention, a substantially pure CO2 stream comprises more than 80 weight-% CO2.

[0055]Throughout the description, unless otherwise indicated, all contents are given as weight-%.

[0056]Throughout the description and the claims the terms impurity and contaminant may be used interchangeably having the same meaning in the context of the present invention and both cover undesired substances in a carbon dioxide stream that should be removed.

[0057]Throughout the description and the claims the terms water activity reducing agent, agent and water inhibitor may be used interchangeably having the same meaning in the context of the present invention, and all cover a substance that is capable of removing water from a carbon dioxide stream.

[0058]Throughout the description and the claims the term water free or dry gaseous stream is a gaseous stream in which the water content is so low so as not to cause process related problems, such as freezing within pipes, container...

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Abstract

The present invention relates to a method for removing at least one contaminant from a gaseous stream substantially comprising carbon dioxide. More specifically said method includes the step of subjecting the gaseous stream to an absorption step in which the absorbent is liquid carbon dioxide.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The instant application is a continuation of and claims priority to co-pending U.S. patent application Ser. No. 13 / 054,453, filed Feb. 17, 2011, which is a National Stage Application of and claims priority benefit to PCT / DK2009 / 050159, filed Jul. 3, 2009, which claims priority to Denmark Patent Application No. PA 2008 01006, filed on Jul. 16, 2008. The aforementioned patent applications are incorporated by reference in their entireties herein.FIELD[0002]The present invention relates to a method for removing at least one contaminant from a gaseous stream substantially comprising carbon dioxide. More specifically, said method comprises the step of subjecting the gaseous stream to an absorption step in which the absorbent is liquid carbon dioxide.BACKGROUND OF THE INVENTION[0003]Carbon dioxide recovery plants are widely used to clean and / or recover carbon dioxide released e.g. from combustion of hydrocarbons, fermentation and gas processing....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/08C01B32/50
CPCF25J3/08B01D53/1487B01D53/1493B01D53/263B01D2252/10B01D2256/22B01D2257/702F25J3/0266F25J2200/02F25J2200/74F25J2205/30F25J2205/50F25J2220/84Y02C20/40B01D53/14B01D53/26C01B32/50F25J3/02
Inventor FIND, RASMUSPOULSEN, JAN FLENSTED
Owner UNION ENG
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