Facilities and membrane methods for separating methane and carbon dioxide from gas streams.

By improving the four-membrane unit membrane separation facility and using highly selective membranes, the methane emission problem in existing technologies has been solved, achieving low-cost and high-efficiency separation of methane and carbon dioxide, meeting stringent emission standards and adapting to changes in gas composition and flow rate.

CN116322952BActive Publication Date: 2026-05-26EVONIK OPERATIONS GMBH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
EVONIK OPERATIONS GMBH
Filing Date
2021-07-01
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies struggle to meet stringent greenhouse gas emission regulations, particularly emission standards with methane content below or equal to 0.3% by volume, without adding extra equipment and energy consumption, while simultaneously achieving high methane yield and low operating costs.

Method used

An improved four-membrane unit membrane separation facility is used. By connecting the permeate outlet of the fourth membrane unit to the methane oxidation unit and directly discharging the permeate from the third membrane unit into the atmosphere, the permeate stream with a methane content of less than 0.3% by volume is ensured to require no further treatment by using highly selective membranes and appropriate operating conditions.

Benefits of technology

It achieves methane emissions at a content of less than 0.3% by volume, meeting stringent emission regulations, while reducing equipment investment and operating costs, increasing methane yield, and adapting to changes in feed gas composition and flow rate.

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Abstract

This invention discloses an apparatus and method having four membrane separation units, wherein a second separation unit separates the permeate from the first unit, a third separation unit separates the permeate from the first unit, a fourth separation unit separates the permeate from the third unit, the permeate from the second unit and the permeate from the fourth unit are recycled to the feed of the first unit, the permeate from the fourth unit is conveyed to a methane oxidation unit and the permeate from the third unit is discharged to the atmosphere. This apparatus and method can separate methane and carbon dioxide from a gas stream, provide a methane-rich stream from the permeate of the second unit with a high methane yield, and utilize a small-sized methane oxidation unit to ensure that the methane emitted to the atmosphere meets the lower limit.
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