Direct air capture of carbon dioxide

By intermittently introducing steam for heating combined with vacuum treatment, the problem of high energy consumption for adsorbent regeneration was solved, achieving low-energy and high-efficiency carbon dioxide capture, and improving the concentration and capture efficiency of the product gas.

CN119838359BActive Publication Date: 2026-06-09CHINA UNIV OF PETROLEUM (BEIJING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Filing Date
2025-01-17
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing direct air capture technologies for carbon dioxide, the energy consumption for adsorbent regeneration is relatively high, and the steam-assisted variable temperature vacuum adsorption cycle process has the problem of excessive energy consumption.

Method used

By intermittently introducing steam to heat the adsorbent, combined with the first and second vacuum treatments, the regeneration energy consumption of the adsorbent is reduced by controlling the temperature and pressure conditions inside the adsorber.

Benefits of technology

It effectively reduces the energy consumption for adsorbent regeneration, improves the desorption efficiency of carbon dioxide and the concentration of product gas, and shortens the adsorption-desorption cycle time.

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Abstract

The embodiment of the present application provides a method for directly capturing carbon dioxide from air. The method comprises the following steps: capturing carbon dioxide in air by an adsorber; performing first vacuumization in the adsorber after capturing carbon dioxide; introducing water vapor into the adsorber to increase the pressure in the adsorber and increase the temperature of the adsorbent in the adsorber, so as to desorb carbon dioxide; performing second vacuumization on the adsorber, and obtaining mixed gas formed by water vapor and carbon dioxide; and performing gas-liquid separation on the mixed gas to obtain carbon dioxide. The method reduces the regeneration energy consumption of the adsorbent and improves the concentration of the carbon dioxide product gas.
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Citation Information

Patent Citations

  • Steam-assisted circulation type direct air carbon dioxide trapping system and steam-assisted circulation type direct air carbon dioxide trapping method

    CN116889779A

  • Apparatus and method for capture and concentration of carbon dioxide

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