Apparatus and method for forming polymer crumb

Concentrating evaporators – Gaseous blast or current – Steam injection

Statutory Invention Registration

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C159S002100, C159S047100, C203S088000, C523S324000, C523S340000, C528S501000

Statutory Invention Registration

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H0002134

ABSTRACT:
The present invention provides a contractor apparatus and method for removing solvent from a polymer cement. The resulting polymer is substantially free of solvent and exhibits improved oil absorption and lower fines. In one aspect, a contractor is provided including a cylindrical casing having a high pressure section, a convergence section, a high velocity section, a divergence section, and a discharge section. The polymer cement is introduced into the high pressure section to significantly and unexpectedly improve solvent removal. The convergence and divergence sections have cross-sectional areas that correspond to an effective angle from about 4° to about 65°, such as 6°. The polymer cement is mixed with high pressure steam. After converging, the polymer cement forms more uniform droplets due to high shear of steam. In the divergence and discharge sections, the polymer is substantially devolatized.

REFERENCES:
patent: 3202647 (1965-08-01), Todd et al.
patent: 3724522 (1973-04-01), Pogson
patent: 3804145 (1974-04-01), Arnold et al.
patent: 3841381 (1974-10-01), Dassesse et al.
patent: 5453158 (1995-09-01), Cummings et al.

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