Concentrating evaporators – Gaseous blast or current – Steam injection
Statutory Invention Registration
2005-12-06
2005-12-06
Behrend, Harvey E. (Department: 3641)
Concentrating evaporators
Gaseous blast or current
Steam injection
C159S002100, C159S047100, C203S088000, C523S324000, C523S340000, C528S501000
Statutory Invention Registration
active
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.
Jean Rong-Her
Ma Chin-Yuan George
Behrend Harvey E.
Shell Oil Company
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