Pressure swing adsorption separation of carbon dioxide from feed using adsorption columns, where column is subjected to adsorption cycle comprising producing carbon dioxide by depressurization and is charged with faujasite-type zeolite

摘要

The process for pressure swing adsorption separation of carbon dioxide from a feed consisting of hydrogen, carbon dioxide, methane, carbon monoxide and other trace components using adsorption columns, is claimed. Each adsorption column is subjected to pressure swing adsorption cycle comprising producing carbon dioxide by depressurization to a pressure that is greater than or equal to an atmospheric pressure. The adsorption columns are charged with a faujasite-type zeolite, EMT-type zeolite or Linde-type zeolite A in the form of aluminosilicate having a silicon/aluminum ratio of 4-6. The process for pressure swing adsorption separation of carbon dioxide from a feed (F) consisting of hydrogen, carbon dioxide, methane, carbon monoxide and other trace components using adsorption columns, is claimed. Each adsorption column is subjected to pressure swing adsorption cycle comprising producing carbon dioxide by depressurization to a pressure that is greater than or equal to an atmospheric pressure. The adsorption columns are charged with a faujasite-type zeolite, EMT-type zeolite or Linde-type zeolite A in the form of aluminosilicate having a silicon/aluminum ratio of 4-6 or with faujasite-type zeolite in the form of silicoaluminophosphate. The pressure swing adsorption cycle comprises: performing counter-current adsorption step (a) in which the feed to be separated is injected in the adsorption column at a high pressure of 15-40 bar; performing a pressure equalization step (eb) in which two columns are connected at different pressure levels so that a part of the quantity of material flows into the lower pressure column at a high pressure; performing depressurization step (bd) in which the adsorption column is depressurized; performing a rinsing step (pur) with carbon dioxide in which a concentrated stream of carbon dioxide is injected into the adsorption column, where the flow of carbon dioxide is obtained by compressing a portion of the carbon dioxide stream; performing the production (pro) of carbon dioxide by depressurization in which the concentrated stream of carbon dioxide is obtained by depressurizing the column against the current at a pressure that is greater than or equal to atmospheric pressure; performing the pressurization step, where the flow of inlet is constituted by the flow of outlet of the depressurization step and flow of the outlet of the rinsing step; and performing the final repressurization step. The adsorption step is carried out at a pressure of 20-30 bars. The rinsing step is carried out at a pressure of 8-9.5 bar. An atomic fraction of silicon/mixture of silicon, aluminum and phosphate is 0.10-0.30.