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Filtration & Separation Solutions

Embrace Ultimate Application Challenges of Filtration, Separation, and Purification Technology

Nylon Manufacturing

Nylon Manufacturing Process

Adipic acid, hexamethylene diamine, and water are added to a reaction vessel to form Hexamethylene diammonium adipate, common known as “nylon salt” solution. After evaporation, water continues to be removed from the “salt solution”. A slurry of TIO₂ pigments and water, used to deluster fibers, is added to the nylon salt. Polymerization begins in the reactor where polyhexamethylene adipamide, (Nylon 66), is formed. The nylon polymer is then extruded through spinnerets or pelletized.

Contamination in:

• Raw materials

• Adipic acid

• Hexamethylene diamine

• DI water

• TIO₂ pigment slurry

• Nylon salt solution

Problems of Contamination

• Fiber breakage, disruptions in fiber spinning

• Plugging of polymer melt filters

• Plugging of screen packs

• Change out costs

• Lost production

• Processing problems at the end-user

• Poor quality, “out-of-spec”, nylon 66 pellets

Recommendation

Ref to Fig.1.	Fluid	Filter recommendation
1	Dl water	FSH/JAF,10µm abs
1	Adipic acid	Rocket bag/JAF,10µm abs
1	Hexamethylene diamine	FCN,10µm abs
2	TIO₂ pigment slurry	CWBC,10µm
2	Nylon salt	FSH/JUMBO,10µm abs
3	Nylon salt for pellets	Rocket bag 3µm abs

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