Method and apparatus for crystallization

Details Method and apparatus for crystallization Method and apparatus for crystallization

2003-12-25

2009-06-23

Kunemund, Robert M (Department: 1792)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from liquid or supercritical state

Having growth from a solution comprising a solvent which is...

Reexamination Certificate

active

07550042

ABSTRACT:
The present invention is a method which is capable of producing crystals having a mean particle diameter larger than conventionally produced crystals, by carrying out a crystallizing method so-called neutralization crystallization. An ingredient organic acid salt solution is supplied as a reaction initial liquid in a reaction vessel (2). An acid is supplied via a dropping tube (10) to the ingredient organic acid salt solution, so that crystals of a targeted organic acid is precipitated. Then, the base is supplied in the reaction vessel (2) via a dropping tube (15), thereby partially dissolving the crystals being precipitated. The acid is further supplied from the dropping tube (10) for carrying out the crystallization.

REFERENCES:
patent: 6413984 (2002-07-01), Philippo et al.
patent: 2005/0070738 (2005-03-01), Isotani
patent: 41-12304 (1966-07-01), None
patent: 1-102033 (1989-04-01), None
patent: 7-17902 (1995-01-01), None
patent: 2000-53617 (2000-02-01), None
Wang et al., Ind. Eng. Chem. Res., vol. 39, pp. 2101-2104, (2000).

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