Chemistry: physical processes – Physical processes – Crystallization
Patent
1976-09-13
1977-12-27
Tayman, Jr., James H.
Chemistry: physical processes
Physical processes
Crystallization
23260, 260 70A, 203 38, 202158, B01D 300
Patent
active
040652670
ABSTRACT:
This invention relates to an improved apparatus for preparing alkylated urea or melamine formaldehyde resins from alcohols having a boiling point higher than water, which apparatus permits the return of substantially dry alcohol from the water distillation system to the reactor.
The apparatus comprises a reactor connected to a fractionating column, having a rectifying section above a stripping section, at the junction of the rectifying section and the stripping section; a reboiler at the bottom of the fractionating column, which returns substantially dry alcohol to the reactor; a condenser which condenses the alcohol-water vapor mixture exiting the rectifying section of the column; and a separator device which separates the condensed mixture into an alcohol phase and a water phase, and from which the alcohol phase is returned to the top portion of the column.
Use of the apparatus of the invention results in a substantial reduction in reaction times.
REFERENCES:
patent: 1394232 (1921-10-01), Stevens
patent: 2260111 (1941-10-01), Caldwell
patent: 2260890 (1941-10-01), Edgar
patent: 3392150 (1968-07-01), Groll
Holste Hilary E.
Ladage Lawrence
PPG Industries Inc.
Severini Carl T.
Tayman, Jr. James H.
Troy Frank J.
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