NON SOLVENT PRECIPITATION

Liquid polymers, solvents and initiators.

PROBLEM:

Continuously mix non-solvent feed with high viscosity copolymer dope mixture.  Copolymer particles precipitate out in non-solvent feed.  Control precipitate particle size to 1-2 mm with minimum fines.

RESULTS:

Controlled particle size to 1-2 mm.  Mixed continuously and uniformly.

AB MIXER:

Model 6 x 3, toothed impeller/liner, 30 HP, 3600 RPM, full open grid. 
Model 3 x 1.5, toothed impeller/liner, 7.5 HP, 4200 to 1200 RPM, 1/4" grid.