Process for recovering polyurethane from polyurethane waste past

Details Process for recovering polyurethane from polyurethane waste past Process for recovering polyurethane from polyurethane waste past

1992-04-09

1994-03-29

Manoharan, Virginia

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 92, 203 95, 203DIG16, 524591, B01D 338

Patent

active

052981282

ABSTRACT:
Polyurethane can be reclaimed from solvent-containing or solvent-free polyurethane wastage by adjusting the amount of solvent, preferably with methyl ethyl ketone; adding an emulsifier, preferably, acylpolyethyleneglycolester; then adding about twelve times the wastage weight of water; mixing, preferably for about one hour at room temperature to form an emulsion; and then expelling the solvent as a two-phase distillate using steam; separating solvent from the resulting two-phase distillate; filtering off polyurethane granular material left floating in the water residue, and drying the separated granular material.

REFERENCES:
patent: 3903031 (1975-09-01), Matsuda et al.
patent: 3903032 (1975-09-01), Matsuda et al.
patent: 3928271 (1975-12-01), Matsuda et al.
patent: 4156064 (1979-05-01), Falkenstein et al.
patent: 4401713 (1983-08-01), Takata
patent: 5043098 (1991-08-01), Padget et al.
patent: 5043381 (1991-08-01), Coogan et al.

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