Chemistry: physical processes – Physical processes – Crystallization
Patent
1991-01-25
1993-08-31
Straub, Gary P.
Chemistry: physical processes
Physical processes
Crystallization
23295R, 23302R, 23302T, 422254, 4234991, B91D 900, C01D 316
Patent
active
052404676
ABSTRACT:
A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is maintained within each recrystallization unit to make use of convection to facilitate or accelerate concurrent dissolution and recrystallization within a single vessel. Solid recrystallized material is moved from one unit to the next unit. An automated apparatus and a manually operated apparatus for carrying out the process are also described.
REFERENCES:
patent: Re32241 (1986-09-01), Saxer
patent: 2147222 (1939-02-01), Treub
patent: 2204180 (1940-06-01), Gerlach
patent: 2562325 (1951-07-01), Merritt
patent: 2593300 (1952-04-01), Hachmuth
patent: 2757126 (1956-07-01), Cahn
patent: 2910516 (1959-10-01), Rush
patent: 3424549 (1969-01-01), Godfrey
patent: 3902855 (1975-09-01), Lynch
patent: 3996031 (1976-12-01), Chong
patent: 4544391 (1985-10-01), Oka
patent: 4588414 (1986-05-01), Takegami et al.
patent: 4666456 (1987-05-01), Thijssen et al.
patent: 4885016 (1989-12-01), Griffiths
patent: 5127921 (1992-07-01), Griffiths
Bicron Corporation
Straub Gary P.
Ulbrich Volker R.
LandOfFree
Multistage countercurrent recrystallization process and apparatu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multistage countercurrent recrystallization process and apparatu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multistage countercurrent recrystallization process and apparatu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2294739