Spiral-wound acid gas separation membrane element, acid gas separation membrane module, and acid gas separation apparatus

A sealing method used for a spiral-wound acid gas separation membrane element including a wound body,

• the wound body including:
• a separation membrane;
• a feed-side channel component;
• a permeate-side channel component;
• a sealing section;
• and
• a perforated core tube,
• the separation membrane, the feed-side channel component, and the permeate-side channel component being in a laminated state and wound around the perforated core tube,
• the separation membrane including:
• a separate functional layer including:
• an acid gas carrier that reversibly reacts with acid gas;
• and
• an acid gas separation membrane resin;
• and
• a support layer including a porous membrane,
• the sealing method comprising the step of:
• applying an adhesive to both widthwise ends of the separation membrane so as to fill in a gap formed between the permeate-side channel component and the separation membrane, the permeate-side channel component being greater at least in an across-the-width direction of the permeate-side channel component than the separation membrane.