US 2024/0189764 A1Published application

Process for reducing carbon dioxide content of gas mixture and membrane separation arrangement

AssigneeLinde Aktiengesellschaft

InventorsAnette FRANZ, Matthias JOHANNINK

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Abstract

Process for reducing CO2 and membrane separation arrangement. A process/arrangement for reducing the CO2 content of a gas mixture using four membrane separation steps, two of the separation steps using glassy membrane and two using rubbery membrane. A first retentate is withdrawn from the first separation step at a first withdrawal pressure and temperature and is supplied to the second separation step, a second retentate is withdrawn from the second separation step at a second withdrawal pressure and temperature and is supplied to the third separation step, a third retentate is withdrawn from the third separation step at a third withdrawal pressure and temperature and is supplied to the fourth separation step, permeates of the separation steps using the glassy membrane are combined to form a first combined permeate stream, and permeates of the separation steps using the rubbery membrane are combined to form a second combined permeate stream.

Claims13

Dependent claims

A process for reducing the carbon dioxide content of a gas mixture containing carbon dioxide using at least four membrane separation steps including a first membrane separation step, a second membrane separation step, a third membrane separation step and a fourth membrane separation step, two of the at least four membrane separation steps being carried out using a glassy membrane and two of the at least four membrane separation steps being carried out using a rubbery membrane,

wherein
a first retentate of the first membrane separation step is withdrawn from the first membrane separation step at a first withdrawal pressure and a first withdrawal temperature and is at least partially supplied to the second membrane separation step at the first withdrawal pressure and the first withdrawal temperature,
a second retentate of the second membrane separation step is withdrawn from the second membrane separation step at a second withdrawal pressure and a second withdrawal temperature and is at least partially supplied to the third membrane separation step at the second withdrawal pressure and the second withdrawal temperature,
a third retentate of the third membrane separation step is withdrawn from the third membrane separation step at a third withdrawal pressure and a third withdrawal temperature and is at least partially supplied to the fourth membrane separation step at the third withdrawal pressure and the third withdrawal temperature,
permeates of the membrane separation steps being performed using the glassy membrane are at least partially combined to form a first combined permeate stream, and
permeates of the membrane separation steps performed using the rubbery membrane are at least partially combined to form a second combined permeate stream.

3 more elements

Dependencies are inferred from the claim text.