Title:
RECRYSTALLIZATION PROCESS
Document Type and Number:
WIPO Patent Application WO2001010830
Kind Code:
A3
Abstract:
The present invention provides a process for producing crystals of a polymorphic compound in a first crystal structure by introduction of the compound in a second crystal structure into a saturated brine solution of the compound under conditions in which formation of the first crystal structure is favored and without evaporation or changes in temperature. As the second crystal structure dissolves, the brine becomes supersaturated resulting in relief of supersaturation by formation of crystals of the first crystal structure. The process includes controlling supersaturation and its relief to achieve growth of existing crystals of the first crystal structure rather than nucleation and formation of new crystals. The resulting crystals are separated from insoluble impurities on a size separation basis.
More Like This:
| JPH10101611 | PURIFICATION OF BENZOIC ACID |
Inventors:
HAZEN WAYNE C
DENHAM DALE LEE JR
PRUSZKO RUDOLPH
BAUGHMAN DAVID R
DENHAM DALE LEE JR
PRUSZKO RUDOLPH
BAUGHMAN DAVID R
Application Number:
PCT/US2000/021505
Publication Date:
June 14, 2001
Filing Date:
August 04, 2000
Export Citation:
Assignee:
ENVIRONMENTAL PROJECTS INC (US)
International Classes:
B01D9/00; C01D7/00; C01D7/24; (IPC1-7): C30B17/00; C01D1/30; C01D3/24; C01D7/40; C01D7/00; C01D15/08; C01D17/00; C01D7/14; C01D7/37; C01D7/24; B01D9/00; C13K1/10; C22B26/10
Foreign References:
| US5300123A | 1994-04-05 | |||
| US3956457A | 1976-05-11 | |||
| US3653848A | 1972-04-04 | |||
| US3314748A | 1967-04-18 | |||
| US2792282A | 1957-05-14 | |||
| US3273959A | 1966-09-20 | |||
| US2962348A | 1960-11-29 | |||
| US2330221A | 1943-09-28 |
Download PDF: