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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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