METHOD FOR RECOVERING AN ETHYLENE STREAM FROM A CARBON MONOXIDE RICH FEED STREAM, AND ASSOCIATED INSTALLATION
First Claim
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1. A method to recover an ethylene stream from a feed stream, comprising the following steps:
- treating a feed stream to obtain a treated gas stream;
at least partly cooling and condensing the treated gas stream in at least one heat exchanger to form at least one column feed fraction;
feeding the at least one column feed fraction into a distillation column to recover an ethylene stream at the foot of the distillation column and, at the head, a head stream depleted of ethylene;
heating at least one downstream flow derived from the head stream in the heat exchanger;
forming an intermediate stream containing at least 20 mole % ethylene and at least 20 mole % carbon monoxide; and
removing the carbon monoxide contained in the intermediate stream.
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Abstract
This method comprises the following steps:
- treating a feed stream (12) to obtain a treated gas stream (60);
- cooling the treated gas stream (60) in a heat exchanger (34) to form at least one column feed fraction;
- feeding each column feed fraction into a distillation column (50);
- heating at least one downstream flow (106) derived from the column head stream (104) in the heat exchanger (34).
The treatment step comprises the forming of an intermediate stream (20) containing at least 20 mole % ethylene and at least 20 mole % carbon monoxide, the method comprising a step to remove the carbon monoxide contained in the intermediate stream (20).
3 Citations
20 Claims
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1. A method to recover an ethylene stream from a feed stream, comprising the following steps:
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treating a feed stream to obtain a treated gas stream; at least partly cooling and condensing the treated gas stream in at least one heat exchanger to form at least one column feed fraction; feeding the at least one column feed fraction into a distillation column to recover an ethylene stream at the foot of the distillation column and, at the head, a head stream depleted of ethylene; heating at least one downstream flow derived from the head stream in the heat exchanger; forming an intermediate stream containing at least 20 mole % ethylene and at least 20 mole % carbon monoxide; and
removing the carbon monoxide contained in the intermediate stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 19, 20)
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16. An installation to recover an ethylene stream from a feed stream the installation comprising:
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an assembly to treat a feed stream to obtain a treated gas stream; an assembly to cool and at least partly condense the treated gas stream comprising at least one heat exchanger to form at least one column feed fraction; a distillation assembly comprising a distillation column and an arrangement to feed the at least one column feed fraction into the distillation column to recover an ethylene stream at the foot of the distillation column and an ethylene-depleted head stream at the head of the distillation column; an assembly to heat at least one downstream flow derived from the head stream in the heat exchanger; an arrangement to form an intermediate stream containing at least 20 mole % ethylene and at least 20 mole % carbon monoxide; an assembly to remove the carbon monoxide contained in the intermediate stream;
the removing assembly being configured to remove at least part of the carbon monoxide contained in the intermediate stream. - View Dependent Claims (17, 18)
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Specification