Alan J Stacey from Richmond, TX, age 77

Address:

6006 Arborwood Ct, Baton Rouge, LA

License #:

PE.0025114 - Expired

Category:

Civil Engineer

Issued Date:

Dec 29, 1992

Expiration Date:

Mar 11, 2015

Type:

Chemical Engineer

Rejuvenation Of Membrane Type Chlor-Alkali Cells By Intermittently Feeding High Purity Brines Thereto During Continued Operation Of The Cell
view source
US Patent:

41167813, Sep 26, 1978
Filed:

Apr 19, 1977
Appl. No.:

5/788836
Inventors:

Martin M. Dorio - Mentor OH
Alan J. Stacey - Parma OH
Assignee:

Diamond Shamrock Corporation - Cleveland OH
International Classification:

C25B 120
C25B 126
C25B 1508
C25B 1308
US Classification:

204 98
Abstract:

Chlor-alkali cells of the membrane type are highly susceptible to multivalent metallic impurities in the brine feeds. As the impurity concentration builds up on and/or in the membrane material, cell voltage increases and current efficiency is lost. By the practice of the instant invention the membrane is rejuvenated and the current efficiency of the cell increased by intermittently replacing the normal brine feed thereto with a brine which is of relatively high purity with respect to the multivalent metallic impurities found in the normal brine feed. Generally, the pure brine feed should have little or no hardness (calcium and magnesium level) or, if present, the hardness should be completely complexed by a phosphate treatment. The other multivalent metallic impurities should be present in the "pure" brine at less than 2 milligrams per liter in total and preferably less than 1 milligram per liter thereof, while each individual other metallic contaminant should not exceed 0. 5 milligrams per liter and preferably it would be below 0.