Polyacrylonitrile (PAN) Storage Tank Selection — Carbon-Fiber Precursor + Membrane

Storing Polyacrylonitrile? Start Here

Polyacrylonitrile, often called PAN, is a key player in making carbon fibers, ultrafiltration membranes, and acrylic textiles. It's available as a spinning-dope solution, powder, or continuous fiber tow. If you're working with PAN, especially in its spinning-dope form, you need to be aware of the solvents involved, like DMSO, DMF, and DMAc, which are tough on many materials. Plus, there's the acrylonitrile monomer to consider, which is a probable human carcinogen. Let's dive into the best ways to store this material safely.

Can you store it in a poly tank?

No, poly tanks are not suitable for storing PAN in its spinning-dope solution form. The solvents used, such as DMSO, DMF, and DMAc, can attack and degrade common polymers like HDPE and polypropylene. Instead, opt for 304 or 316L stainless steel tanks, which are resistant to these solvents.

Key Issue: Solvent Compatibility

The primary concern with storing PAN is the aggressive nature of the solvents used in the spinning-dope solutions. These solvents can damage many materials, so it's crucial to choose storage solutions that can withstand them. Stainless steel with PTFE linings is recommended for this purpose.

The safety that actually matters

• Use stainless steel tanks for dope solutions to prevent material degradation.
• Ensure proper ventilation and monitoring for acrylonitrile exposure.
• Implement a dry-nitrogen blanket to control fumes.

Common questions

Can I store PAN powder in a poly tank?

Yes, PAN powder can be stored in poly tanks, but ensure proper handling to avoid exposure to residual acrylonitrile monomer.

What gaskets should I use for PAN solutions?

Use PTFE or Kalrez gaskets for the best resistance to the solvents in PAN solutions.

How do I handle PAN fiber tow?

Store PAN fiber tow on dedicated spool racks with controlled humidity to maintain its quality for further processing.