Gas separation method and purified gas production method

WO2026140732A1PCT designated stage Publication Date: 2026-07-02ASAHI KASEI KOGYO KABUSHIKI KAISHA

Patent Information

Authority / Receiving Office: WO · WO
Patent Type: Applications
Current Assignee / Owner: ASAHI KASEI KOGYO KABUSHIKI KAISHA
Filing Date: 2025-12-02
Publication Date: 2026-07-02

AI Technical Summary

Technical Problem

Existing gas separation methods using zeolite adsorbents face challenges in achieving high recovery rates for poorly adsorbed gases while minimizing power consumption required for pressurization, as they often result in decreased gas purity and increased energy costs due to inefficient recycling and discharge strategies.

Method used

A gas separation method involving a pressurization step, adsorption step, pressure reduction step, and recycling step, where the gas discharged during pressure reduction is recycled in parallel to the raw material gas supply direction, maintaining a Ve/Vf ratio of 0.2 or less, and utilizing zeolite adsorbents with specific conditions to optimize adsorption and desorption processes.

Benefits of technology

This method enhances the recovery rate of poorly adsorbed gases while reducing power consumption by optimizing the Ve/Vf ratio and recycling strategies, thereby improving the efficiency and reducing operational costs.

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Abstract

The present invention addresses the problem of providing a gas separation method and a purified gas production method that, while obtaining a high rate of recovery of a less adsorbable gas, are capable of reducing power consumption that is required to pressurize a starting material gas, which is to be fed to an adsorption step. The present invention provides, as a solution to said problem, a gas separation method using an adsorbent that includes zeolite, said gas separation method comprising a pressurization step for pressurizing a starting material gas that contains a readily adsorbable gas and a less adsorbable gas, an adsorption step for supplying the starting material gas to an adsorption tower that is filled with the adsorbent, causing the adsorbent to adsorb the readily adsorbable gas, and recovering the less adsorbable gas that has been purified, a depressurization step for stopping the supply of the starting material gas to the adsorption tower, causing gas present in the adsorption tower to flow out from the adsorption tower in the parallel flow direction of the starting material gas supply direction, and decreasing the pressure inside the adsorption tower, and a recycling step for feeding gas discharged in the depressurization step to the pressurization step. The relationship between the amount Ve of the gas discharged from the adsorption tower in the depressurization step and the amount Vf of the starting material gas supplied to the adsorption tower in the adsorption step is such that the ratio Ve / Vf is not more than 0.2.

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