Sodium Sulphite (sulfite) with Catalyst Powder

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Sodium Sulphite (sulfite) with Catalyst Powder

Removal of oxygen using commercial sodium sulfite and a catalyzed sodium sulfite makes great difference . After 25 seconds of contact, catalyzed sodium sulfite removed the oxygen completely. Uncatalyzed sodium sulfite removed less than 50% of the oxygen i

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SKU: RXSOL-19-1305-025 Category:

Catalyzed sodium sulfite for corrosion prevention. Generally speaking, sulfite is not present in natural water.  In boiler feedwater conditioning sodium sulfite is fed to a boiler to remove dissolved oxygen and thus prevent pitting. For the reaction between sulfite and oxygen to proceed rapidly and completely, it is necessary to maintain an excess sulfite concentration at an elevated temperature. 

Theoretically, 3.5 Kg of chemically pure sodium sulfite are required to remove approx 400 gram of oxygen. The efficiency of the oxygen removal is estimated at 75 per cent to allow for oxidation in contact with air, blowdown losses, etc. Therefore it is estimated that 4.5 Kg of commercial sodium sulfite are required for 450 Gram of oxygen removed (or 10 ppm sulfite per 1 ppm dissolved oxygen.)

The use of sodium sulfite as a chemical deoxygenator is economical within certain limitations imposed by the dissolved oxygen content of the feedwater. If appreciable quantities of dissolved oxygen are permitted to enter the boiler, costs will be high if sulfite is relied on as the sole means of oxygen removal. Generally, costs are balanced by removal of as much of the oxygen as feasible by mechanical means, e.g. deaerator and by using sulfite to react with the residual oxygen.

To prevent corrosion and pitting in feed lines, closed heaters and economizers, it is desirable to feed the sulfite continuously to the boiler feedwater rather than directly to the boiler feedwater rather than directly to the boiler. Reaction between sulfite and oxygen is not instantaneous and the completion of the reaction is aided by the longer contact times provided by feeding sulfite to the feedwater.

Catalyzed sodium sulfite will, however, react almost instantaneously with dissolved oxygen even at cold water temperatures. Because of this property, catalyzed sulfite has found increased use in the treatment of cooling water, process water, distribution system, etc. for preventing oxygen corrosion.  

 

Technical Bulletin

Discription :::

Sodium sulfite anhydrous is a white granular material with the chemical formula Na2SO3

It is primarily used in pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, in the photographic industry to protect developer solutions from oxidation, in textile industry as a bleaching, as a desulfurising and as a dechlorinating agent and in leather trade for the sulfitisation of tanning extracts. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of rubber chemicals, sulfur dyes and other chemical compounds. It is used in other applications including ore flotation, oil recovery, food preservative, making dyes, and detergent.

White, free flowing crystalline Odorless powder

Technical Specification :::

 

SODIUM SULFITE

Test Results

Colour

Yellow
Molecular Weight  126.05
Bulk Density  1.3 – 1.5 kg/dm3
Sodium Sulfite, wt % 99min
Sodium Sulfate, wt %  Max. 1
Moisture, % 
0.05max
Insolubles, %  0.03max
Sodium Chloride, ppm  50max
Iron (Fe), ppm 3max
Heavy Metals, (Pb) ppm  10max
Selenium, ppm 2max
Arsenic, ppm 1max
PH of 5% Solution (@ 25° C) 9.5-10.6
Ca/Mg NH40H Inso. % 0.50max
Alk. as Na2C03 % w/w 0.15max
Water insolubles (other than Iron compounds) % by wt. Max. 0.25
 

Application :::

Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants
Boiler water treatment
Oxygen scavenger
Preservative
Pharmaceuticals
Flue gas desulfurization
Chemical manufacturing in the sulfonation process
Preservative in photo developer solutions

Product Label

Catalyzed sodium sulfite for corrosion prevention. Generally speaking, sulfite is not present in natural water. In boiler feedwater conditioning sodium sulfite is fed to a boiler to remove dissolved oxygen and thus prevent pitting. For the reaction between sulfite and oxygen to proceed rapidly and completely, it is necessary to maintain an excess sulfite concentration at an elevated temperature.

Theoretically, 3.5 Kg of chemically pure sodium sulfite are required to remove approx 400 gram of oxygen. The efficiency of the oxygen removal is estimated at 75 per cent to allow for oxidation in contact with air, blowdown losses, etc. Therefore it is estimated that 4.5 Kg of commercial sodium sulfite are required for 450 Gram of oxygen removed (or 10 ppm sulfite per 1 ppm dissolved oxygen.)

 

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