Generators

Sabre Oxidation Technologies, Inc. has developed the next generation of vacuum driven chlorine dioxide generation systems, which utilizes both two and three chemical pre-cursor chemical processes. This design was made to eliminate many of the problems associated with previous methods of chlorine dioxide generation. The two chemical process uses 25% aqueous sodium chlorite solution and chlorine gas.

The Sabre System patented¹ Tuned Reaction Column is designed to eliminate the build-up of material in the reaction column that can lead to frequent flushing, disassembly and manual cleaning. The Integral Component Block Mounted designed generator is built from a block of chemically resistant Schedule 80 PVC plastic with most of the pipe connections, chemical feed lines, and reaction column bored into the block. This process avoids the need for most of the external tubing, fittings, and connections common to other generators which are a source of pressure and vacuum leaks resulting in poor performance and efficiencies.

SPECS

Compact Systems: 30"w x 36"h x 6"d <1,000 lbs. ClO2 /day Typical Systems: 10 to 1,000 lbs. ClO2 /day Other System Designs: Up to 100,000 lbs. ClO2 /day ClO2 is generated at minimum of 95% efficiency with <5% excess chlorine.

The major generator components shall be: Visual flow meters for both precursors. Vacuum producing ejector. Patented1 Tuned reaction column. Inlet water flow meter. Chlorine dioxide sampling port. Chlorine dioxide sight glass.

ACCESSORIES: On-Line ClO2 ppm Analyzer. Amperometric Titrator. Booster Pumps. Electrical Control Panel. ORP Controls. Generator Chemical Flushing System. CUSTOMER APPLICATION INFORMATION: Generator Size or Dosing Info. Motive Water Pressure and Flow Rate Available. Back Pressure at Application Point. Electrical Requirements.

METHOD OF OPERATION

The generator operates by water flow over an ejector that creates a vacuum and drives the entire system. This vacuum draws the precursor chemicals from their storage points through the generator¹s ten inch precision glass meters and into the patented1 Tuned Reaction Column where the chlorine dioxide reaction takes place. In milliseconds the chlorine dioxide is educted from the reaction column and into the water stream where it is immediately diluted and flows to the point of application. There are no dangerous concentrations of precursor chemicals in the Sabre generation process.

ANALYTICAL ANALYSIS

With the included inlet water flow meter and the feed rate chart, a sample port is provided to quickly and easily obtain a sample of the generator product stream for analysis. This sample conveniently provides all the information needed to perform generator efficiencies and mass balances as may be required by government agencies, depending on your application, using Standard Methods. A sight glass for a visual indication of chlorine dioxide production is also provided.

ADVANTAGES

Vacuum Operated - No costly troublesome chemical feed pumps are required. A leak in the Sabre chemical feed lines results in air being educted into the system.

Not pH Dependent - Sabre generators are also not pH dependent and operate at near the true stoichiometric range required for efficient generation of chlorine dioxide. pH dependent systems require excess chlorine to be fed to significantly depress the pH to enhance the conversion of sodium chlorite which results in a more corrosive product stream and contains excess chlorine which enhances chlorate formation. Sabre System chlorine dioxide generators achieve 95% plus efficiencies with no more than 5% excess chlorine.

Chemical Handling - Sabre generators operate on 25% sodium chlorite solution that is easily shipped in drums, totes or bulk truckload shipments. 25% sodium chlorite is listed as a corrosive material and is not an oxidizer as is dry sodium chlorite. Once delivered there is no handling required by plant personnel.

Generator System Specifications

All materials in contact with chlorine dioxide, chlorine gas and sodium chlorite solution shall be constructed of Schedule 80 PVC, Teflon, polyethylene, or acceptable non-corroding metals. Piping shall be furnished with sufficient unions to permit easy assembly and disassembly. All shutoff valves shall be true-union ball valves.

Chlorine dioxide generator control components shall be contained on a corrosion resistant panel that shall be wall mounted. All components shall be fully accessible from the front.

Chlorine gas flow shall be metered by a rotometer with a display calibrated in pounds per day of chlorine gas. The chlorine supply should be dedicated to the chlorine dioxide generation system. Sodium chlorite flow shall be metered through a glass meter calibrated from 0-100% and shall be accompanied by a feed rate chart to show the appropriate setting for the desired chlorine dioxide dosage.

The generator will be capable of a 10:1 control range and the chemical feed meters will have an accuracy: ± 4% of the full flow meter range.

The chlorine dioxide generator will provide a minimum yield of 95% based on the conversion of sodium chlorite with no more than 5% excess chlorine in the generation process. The yield will be determined by amperometric titration, which is capable of differentiating between chlorine dioxide, chlorine, chlorite, and chlorate. The analysis procedure shall be the method published in Standard Methods For The Treatment Of Water And Wastewater, APHA, AWWA, WEF, 19th (and later) Edition. Chlorine Dioxide. 4500-ClO2 E. pg 4-80 to 83. Published APHA, Washington, DC.

Efficiency will be based on the theoretical stoichiometry optimized to produce ClO2 from chemical feed rates of the reactants, according to:

2NaClO2 + Cl2 —> 2 ClO2 + 2NaCl

 

¹ US Patent No 6,468,479. International & Other Patents Pending.