Process for treating a gas stream from plastic pyrolisis and/or biomass pyrolisis, and installation for integration into a steam cracker
AssigneeTechnip Energies France
InventorsVeronique Reich, Yvon Simon, Walkiria Braga
Life of this patent
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Abstract
This process comprises quenching and washing with water a gas stream derived from pyrolysis, and separating an aqueous phase from a washed gas stream; compressing, then cooling a washed gas stream; washing the compressed gas stream under pressure; passing the washed gas stream through at least one acid removal unit; drying the acid-depleted gas stream; passing the dry gas stream through at least one impurity removal unit; and feeding the purified gas stream into a cryogenic absorption unit and supplying the cryogenic absorption unit with a hydrocarbon cryogenic solvent to obtain a light gas residue, and a fraction of C2+ hydrocarbons.
Claims19
A process for treating at least one gas stream derived from pyrolysis of plastic and/or biomass, the process comprising:
- quenching and washing with water the gas stream derived from pyrolysis of plastic and/or biomass in a quench/wash unit, and separating an aqueous phase from a washed gas stream;
- compressing then cooling the washed gas stream to form a compressed gas stream;
- washing the compressed gas stream under pressure to form a second washed gas stream;
- passing the second washed gas stream through at least one acid removal unit to form an acid-depleted gas stream whereby carbon dioxide is removed from the second washed gas stream;
- drying the acid-depleted gas stream to form a dry gas stream;
- passing the dry gas stream through at least one impurity removal unit to form a purified gas stream;
- and
- feeding the purified gas stream into a cryogenic absorption unit and supplying the cryogenic absorption unit with a hydrocarbon cryogenic solvent to obtain a light gas residue at a first outlet of the cryogenic absorption unit, and a fraction of C2+ hydrocarbons at a second outlet of the cryogenic absorption unit.
A process for treating at least one gas stream derived from pyrolysis of plastic and/or biomass, the process comprising:
- quenching and washing with water the gas stream derived from pyrolysis of plastic and/or biomass in a first quench/wash unit, and separating an aqueous phase from a washed gas stream;
- compressing then cooling the washed gas stream to form a compressed gas stream;
- providing the compressed gas stream and a washing fluid to a second wash unit and washing the compressed gas stream under pressure in the second wash unit having a high-pressure washing chamber to form a second washed gas stream;
- passing the second washed gas stream through at least one acid removal unit to form an acid-depleted gas stream
- drying the acid-depleted gas stream to form a dry gas stream;
- passing the dry gas stream through at least one impurity removal unit to form a purified gas stream;
- and
- feeding the purified gas stream into a cryogenic absorption unit and supplying the cryogenic absorption unit with a hydrocarbon cryogenic solvent to obtain a light gas residue at a first outlet of the cryogenic absorption unit, and a fraction of C2+ hydrocarbons at a second outlet of the cryogenic absorption unit.
A process for treating at least one gas stream derived from pyrolysis of plastic and/or biomass, the process comprising:
- quenching and washing with water the gas stream derived from pyrolysis of plastic and/or biomass in a first quench/wash unit, and separating an aqueous phase from a washed gas stream;
- compressing then cooling the washed gas stream to form a compressed gas stream;
- providing the compressed gas stream and a washing fluid to a second wash unit and washing the compressed gas stream under pressure in the second wash unit having a high-pressure washing chamber to form a second washed gas stream;
- passing the second washed gas stream through at least one acid removal unit to form an acid-depleted gas stream;
- drying the acid-depleted gas stream to form a dry gas stream;
- passing the dry gas stream through at least one impurity removal unit to form a purified gas stream;
- feeding the purified gas stream into a cryogenic absorption unit and supplying the cryogenic absorption unit with a hydrocarbon cryogenic solvent to obtain a light gas residue at a first outlet of the cryogenic absorption unit, and a fraction of C2+ hydrocarbons at a second outlet of the cryogenic absorption unit;
- feeding the fraction of C2+ hydrocarbons to a fractionating column and separating the fraction of C2+ hydrocarbons into a fraction of C2 hydrocarbons, a fraction of C3+ hydrocarbons, a fraction of C3 hydrocarbons, and a fraction of C4 hydrocarbons;
- and
- recycling at least a portion of the fraction of C3+ hydrocarbons to an inlet side of the cryogenic absorption to mix with the cryogenic solvent;
- and
- feeding a remaining fraction of the C2 hydrocarbons, a fraction of C3+ hydrocarbons, a fraction of C3 hydrocarbons, and a fraction of C4 hydrocarbons, and the light residue to a cracking installation.
Dependencies are inferred from the claim text.