Installation and process for the crystallization of an inorganic substance and process and installation for the crystallization of sodium carbonate monohydrate

Patent 5396863 Issued on March 14, 1995. Estimated Expiration Date:

March 9, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2034969

3236590

3314748

3529938

3865922

Solidification and crystallization of materials
Patent #: 4022820
Issued on: 05/10/1977
Inventor: Johnson

Solidification and crystallization of materials
Patent #: 4144308
Issued on: 03/13/1979
Inventor: Johnson

Apparatus for purifying crystals
Patent #: 4588562
Issued on: 05/13/1986
Inventor: Saitoh , et al.

Apparatus for purifying crystals
Patent #: 4806318
Issued on: 02/21/1989
Inventor: Saitoh , et al.

Biological conversion method Patent #: 5143543
Issued on: 09/01/1992
Inventor: Reid, et al.

Inventors

Assignee

Solvay

Application

No. 029423 filed on 03/09/1993

US Classes:

117/206, For crystallization from liquid or supercritical state117/200, APPARATUS117/202, With responsive control means117/204With means for treating single-crystal (e.g., heat treating)

Examiners

Primary: Breneman, R. Bruce
Assistant: Garrett, Felisa

Attorney, Agent or Firm

Spencer, Frank & Schneider

Foreign Patent References

661071 BE. 03/12/1965
73085 EP. 03/12/1983
0004401 JP 01/12/1984

International Class

C30B 007/04

Foreign Application Priority Data

1992-03-25 FR

Abstract

Installation for the crystallization of an inorganic substance in a crystal slurry, by desupersaturation of a supersaturated solution, the installation comprising a crystallization chamber which has a vertical axis and is divided into a central zone (4) and an annular zone (5), a device (9, 10) designed to bring about a vertical translation of the slurry in the central zone (4) and a translation in the opposite direction in the annular zone (5), a device (8) for withdrawing slurry, comprising a tube (23, 24) which opens into one of the abovementioned zones, a member (14) for mechanical shearing of the slurry, comprising, a disc (17) carrying a ring of shearing teeth (19), and a tube (6, 31) passing through the cover (30) and serving to introduce anhydrous sodium carbonate, the tube (31) having a prolongation inside the crystallization chamber, over which prolongation a film of water is caused to circulate.

Other References

Kirk-Othmer Encyclopedia of Chemical Technology Third Edition, vol. 15, "Matches to N-Nitrosamines"
Kirk-Othmer Encyclopedia of Chemical Technology Third Edition, vol. 7, "Copper Alloys to Distillation"
American Chemical Society Monograph Series, Second Edition, 1969, Te-Pang Hou: "Manufacture of Soda