Use of Solvent to Decrease Caustic Scrubber Fouling
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United States of America Patent
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app pub date -
Feb 18, 2014
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May 7, 2010
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Abstract
A method of reducing the formation of fouling deposits occurring in a caustic scrubber used to remove acid gases can include providing a caustic scrubber fed with an alkaline aqueous solution including essentially one or more of NaOH, KOH or LiOH. The method can include providing an olefin-containing hydrocarbon stream that is contaminated with oxygenated compounds and acid gases. The oxygenated compounds can be capable of making polymeric fouling deposits in the presence of the alkaline solution of the scrubber. The method can include sending the hydrocarbon stream to the caustic scrubber to recover an olefin-containing hydrocarbon stream that is essentially free of acid gases. An efficient amount of a solvent capable of reducing the formation of fouling deposits can be introduced in the caustic scrubber and/or in the alkaline solution fed to the scrubber. The solvent can be separated from the alkaline solution.
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