Improved chemical absorption process for recovering olefins from cracked gases
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A technology of olefins and gases, applied in chemical instruments and methods, purification/separation of hydrocarbons, organic chemistry, etc., can solve problems such as large solution circulation speed
Inactive Publication Date: 2002-12-18
STONE WEBSTER ENG
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In addition, cuprous salts are not as soluble as silver salts, such as silver nitrate, requiring greater solution circulation rates and larger equipment
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[0028] The present invention proposes a new method for recovering olefins from cracked gas. The method includes the following steps: (a) Demethanization of cracked gas stream removes at least part of methane and almost all hydrogen from the cracked gas stream to generate a partially demethanized gas stream; b) The partially demethanized gas stream is contacted with a metal solution capable of selectively chemically absorbing ethylene and propylene to generate a separate paraffin-enriched gas stream and a chemically adsorbed olefin-enriched stream; and (c) from the chemical absorbent The olefin is recovered from the solution.
[0029] In the method of the present invention, demethanization includes the following steps:
[0030] (I) The depropanized gas stream is quenched to -30℃--60℃, so that C 2 +Partial condensation of components;
[0031] (II) The condensed C 2 +The components are separated from the quenched gas stream;
[0032] (III) Demethanization of the quench gas stream to pr...
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Abstract
The present invention relates to an improved process for the recovery of high purity olefins from cracked gas effluents or other paraffin / olefin gas mixtures by chemical absorption.
Description
[0001] The invention relates to a method for recovering olefins from cracked gas by using a chemical absorption method. Background of the invention [0002] Methods of converting hydrocarbons at high temperatures, such as steam cracking, catalytic cracking, or deep catalytic cracking, to produce higher yields of unsaturated hydrocarbons such as ethylene, propylene, and butene are well known in the art. See, for example, US Patent No. 3,407,789 of Hallee et al.; US Patent No. 3,820,955 of Woebeke; US Patent No. 4,499,055 of Di Nicolantonio; US Patent No. 4,814,067 of Gartside et al.; US Patent No. 4,828,679 of Cormier, Jr, etc.; U.S. Patent No. 3,647,682 of Rabo et al.; U.S. Patent No. 3,758,403 of Rosinski et al.; U.S. Patent No. 4,814,067 of Gartside et al.; U.S. Patent No. 4,980,053 of Li et al.; and U.S. Patent No. 5,326,465 of Yongqing et al. [0003] It is well known in the art that these monoolefin compounds are very useful for preparing a variety of petrochemical products. F...
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