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Enviro Guard Sulfite

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Navi Mumbai, Vashi, Turbha, Rabale, Pawna, Nerul, Taloja, Nashik, Pune, Nagpur, MIDC, Vapi ... More locations >>
Generic Name: 
Catalyzed sodium sulfite for corrosion prevention

Removal of chlorine, After 25 seconds of contact, catalyzed sodium sulfite removed the chlorine content in a Ballast Water Treatment System. Most commonly used to reduce the residual chlorine

Product Description: 

Enviro Guard 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.  

Product Application: 

Enviro Guard Sulfite is a white granular material.

White, free flowing crystalline Odorless powder

Dechlorination for Ballast Water, pulp & paper, power, and textile water treatment plants
Boiler water treatment
Oxygen scavenger
Flue gas desulfurization
Chemical manufacturing in the sulfonation process
Preservative in photo developer solutions
Product Procedure: 

Dose of Enviro Guard Sulfite can be controlled by this method :::  Because it readily reacts with oxygen to form sulfate, sulfite is not usually found in natural water systems. In its most common form, sodium sulfite, it is widely used as an oxygen scavenger in feedwater conditioning to prevent pitting in boilers; as a pulping or pulp-bleaching agent by the paper industry; to neutralize residual chlorine in potable water, sewage, industrial effluents, and textile process waters; and as a reducing agent in still other manufacturing processes. 

Sample water over 100°F will cause a false-high reading; therefore, quickly cool to room temperature before testing. To prevent a false-low reading caused by the reaction between sulfite and ambient air or dissolved oxygen, water samples should be capped while cooling and then tested without delay. An iodometric drop test is the most popular field method for determining sodium sulfite concentrations. 

Reagent packs, containing an instruction and chemicals only, may be purchased for use with buret setups. Note: Sulfide and ferrous iron cause positive interference; copper and nitrite cause negative interference.

Sulfite, Titrimetric Method(0-100ppm)

The test  for sulfite is based on the colour change end point reaction. At the end point reagent combines with the indicator to form a blue color. 

Apparatus Required

Buret, automatic, 25 ml    -  1 ( Sample Tube, Graduated, 25 mL, plastic w/cap and white dot )
Casserole porcelain, 210 ml  -  1
Cylinder, graduated, 50 ml  -  1
Measuring dipper (plastic)  -  1
Stirring rod, glass    -  1 

Chemicals Required

TK - 13 ::: RXSOL-62-5503-002
TK - 14 ::: RXSOL-62-5503-003
TK - 15 ::: RXSOL-62-5503-004  ( 1 ml =0.5 mg SO3 )


Procedure for Test

The water sample should be freshly obtained with as little contact as possible with air. Do not filter the sample, but cool it to room temperature (70 to 800F).
Sample must be cooled to less than 100ºF (38ºC) to prevent high test results. 
Sample must be protected from air contact while cooling to prevent low test results. 

1. Measure 50 ml of the water sample with the graduated cylinder . For error free result Collect water to be tested in a clean, preferably large-mouthed, bottle to overflowing. Immediately cap and cool to room temperature. 

2. Add three or four drops of TK - 13 ::: RXSOL-62-5503-002  to the sample Swirl to mix. Sample should turn red. 

3. Add  TK - 14 ::: RXSOL-62-5503-003 Powder a dipper at a time, swirling after each dipper, until color changes from red to colorless. Add 2 more dippers. Swirl until dissolved.  ( Note : Use the plastic dipper to add TK - 14 ::: RXSOL-62-5503-003 to the sample. Add only one measure at a time and stir thoroughly between each addition of TK - 14 ::: RXSOL-62-5503-003. All the particle of TK - 14 ::: RXSOL-62-5503-003 may not dissolve and this may create a slight haze in the sample. Continue to add the TK - 14  in this manner until the red color disappears. It is not necessary that the sample solution be exactly neutralized, only that the sample turn colorless. When the sample is colorless, add one additional measure of TK - 14 ::: RXSOL-62-5503-003 and stir. )

4. Add TK - 15 ::: RXSOL-62-5503-004 Reagent dropwise, swirling and counting after each drop, until color changes from colorless to a faint but permanent blue. Always hold bottle in vertical position. 
This color change is taken as the endpoint. Record the ml of TK - 15 ::: RXSOL-62-5503-004 solution used. 


Calculation of Results

FORMULA:    ppm sulfite as SO3  = ml  of TK - 15 ::: RXSOL-62-5503-004  x       500    /  ml SAMPLE  

                        Using a 50 ml sample, sulfite, in parts per million as SO3  is equal to the ml of TK - 15 ::: RXSOL-62-5503-004 required multiplied by 10. 


Limitations of Test :::

This method is rapid and adaptable to field determinations.  It is affected by any oxidizable substances in the water such as organic matter sulfides and nitrites.  The presence of these interfering substances will cause the sulfite content obtained from this titration to by shown as a higher value than actually exists.  

Product Note: 
The use of untreated water in a boiler can cause scale buildup and corrosion. Treating the boiler water with chemicals - known as boiler feed water treatment - will increase the life of the boiler and reduce maintenance costs. Scale is formed from calcium and magnesium salts that are carried in solution in the water used in the boiler. Treatment of the boiler water by raising the pH with the addition of alkaline salts – such as sodium or potassium hydroxide – will prohibit most of the calcium and magnesium salts from precipitating and causing scale buildup in the boiler. Sodium sulfite is a constituent of some boiler feed water treatments. This constituent acts as an oxygen scavenger. The presence of oxygen in boiler water will lead to corrosion of the boiler . A chelating agent, sodium hexametaphosphate is sometimes added to boiler water to inhibit hard water salts from precipitating to form scale. Hydrochloric acid is sometimes utilized in acid boils to remove scale form the boiler. 
Product Technical Specification: 
Test Results
white Yellow
Bulk Density 1.3 – 1.5 kg/dm3
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
Test Results
Sodium Sulphide (as Na2S) % by wt. 58% to 60%
Sodium Hydro Sulphate (AS NaHS) % by wt. Max. 2.50
Sodium Compounds (AS Na2S2O3) % by wt. Max. 2.00
Sodium Sulphate (AS Na2S2O4) % by wt. Max. 0.20
Sodium Chloride (AS Nz01) Max. 1.00
Water insolubles (other than Iron compounds) % by wt. Max. 0.25
Product pack size: 

Product alias: 
<p> Catalyzed sodium sulfite Na2SO3, TG Enviromental Guard 25 kg PACK</p>
Popular Oxygen Scavengers
Catalyzed sodium sulfite Na2SO3  60 kg drum, 91% anhydrous powder
 Must be dissolved in water to give a 3-5% solution.
Catalyzed sodium metabisulfite NaHSO3 
The liquid of  25 wt% sodium metabisulfite solution Tends to react with atmospheric oxygen over time. More acidic than ammonium bisulfite.
Ammonium bisulfite NH4HSO3 :  37 wt% solution of NH4HSO3 is selected for use due to ease of handling. However, ammonium ion does provide an additional food source for bacteria. 
Calculation of Oxygen Scavenger Requirement
Use the following steps:
a) Calculate the mass of oxygen in solution.
b) Multiply the mass of oxygen in solution (a) by the feed ratio.
c) Add additional 20 mg/liter in excess.
d) Take into account the concentration of the oxygen scavenger in the supplied chemical.
For Example:
How much ammonium bisulfite (37%wt concentration) will be required to treat 10,000 liter of water containing 8 mg/liter of dissolved oxygen?
 [(10 x 10,000 liter x 8 mg/liter) + 10,000 liter x 20 mg/liter] / 0.37
(feed ratio x volume x oxygen content) + (volume x residual scavenger concentration) / concentration
 = (800,000 mg + 200,000 mg) / 0.37
 = 2,702,703 mg
 This is approx. 2.7 kg of 37% wt. ammonium bisulfite
 Assuming a specific gravity of 37 weight % ammonium bisulfite is 1.185  = 2.7 kg / 1.185 kg/liter = 2.3 liters of ammonium bisulfite to be injected. 

Neutralizer for Ballast Water Management System Enviro Guard Sulfite manufacturer and supplier in Mumbai, Kandla, Kolkata, Chennai, Visakhapatnam, Haldia, Paradip, Gandhidham, Hazira Surat, Muscat Oman, Barka, Ruwi, Ghala, Fujairah, Ajman, Abudhabi, Dubai, Sharjah, UAE, Nairobi Kenya, Sudan, Yemen, Canada


Oxygen Control

Chemical Oxygen Scavengers. The oxygen scavengers most commonly used in boiler systems are sodium sulfite, sodium bisulfite, hydrazine, catalyzed versions of the sulfites and hydrazine, and organic oxygen scavengers, such as hydroquinone and ascorbate.

It is of critical importance to select and properly use the best chemical oxygen scavenger for a given system. Major factors that determine the best oxygen scavenger for a particular application include reaction speed, residence time in the system, operating temperature and pressure, and feedwater pH. Interferences with the scavenger/oxygen reaction, decomposition products, and reactions with metals in the system are also important factors. Other contributing factors include the use of feedwater for attemperation, the presence of economizers in the system, and the end use of the steam. Chemical oxygen scavengers should be fed to allow ample time for the scavenger/oxygen reaction to occur. The deaerator storage system and the feedwater storage tank are commonly used feed points.

In boilers operating below 1,000 psig, sodium sulfite and a concentrated liquid solution of catalyzed sodium bisulfite are the most commonly used materials for chemical deaeration due to low cost and ease of handling and testing. The oxygen scavenging property of sodium sulfite is illustrated by the following reaction:

2Na2SO3 + O2 ® 2Na2SO4
sodium Sulfite   oxygen   sodium sulfate


Theoretically, 7.88 ppm of chemically pure sodium sulfite is required to remove 1.0 ppm of dissolved oxygen. However, due to the use of technical grades of sodium sulfite, combined with handling and blowdown losses during normal plant operation, approximately 10 lb of sodium sulfite per pound of oxygen is usually required. The concentration of excess sulfite maintained in the feedwater or boiler water also affects the sulfite requirement.

Sodium sulfite must be fed continuously for maximum oxygen removal. Usually, the most suitable point of application is the drop leg between the deaerator and the storage compartment. Where hot process softeners are followed by hot zeolite units, an additional feed is recommended at the filter effluent of the hot process units (prior to the zeolite softeners) to protect the ion exchange resin and softener shells.

As with any oxygen scavenging reaction, many factors affect the speed of the sulfite-oxygen reaction. These factors include temperature, pH, initial concentration of oxygen scavenger, initial concentration of dissolved oxygen, and catalytic or inhibiting effects. The most important factor is temperature. As temperature increases, reaction time decreases; in general, every 18°F increase in temperature doubles reaction speed. At temperatures of 212°F and above, the reaction is rapid. Overfeed of sodium sulfite also increases reaction rate. The reaction proceeds most rapidly at pH values in the range of 8.5-10.0.

Certain materials catalyze the oxygen-sulfite reaction. The most effective catalysts are the heavy metal cations with valences of two or more. Iron, copper, cobalt, nickel, and manganese are among the more effective catalysts.
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 in this same time period. In a boiler feedwater system, this could result in severe corrosive attack.

The following operational conditions necessitate the use of catalyzed sodium sulfite:

  • low feedwater temperature
  • incomplete mechanical deaeration
  • rapid reaction required to prevent pitting in the system
  • short residence time
  • use of economizers

High feedwater sulfite residuals and pH values above 8.5 should be maintained in the feedwater to help protect the economizer from oxygen attack.

Some natural waters contain materials that can inhibit the oxygen/sulfite reaction. For example, trace organic materials in a surface supply used for makeup water can reduce speed of scavenger/oxygen reaction time. The same problem can occur where contaminated condensate is used as a portion of the boiler feedwater. The organic materials complex metals (natural or formulated catalysts) and prevent them from increasing the rate of reaction.

Sodium sulfite must be fed where it will not contaminate feedwater to be used for attemporation or desuperheating. This prevents the addition of solids to the steam.

At operating pressures of 1,000 psig and higher, hydrazine or organic oxygen scavengers are normally used in place of sulfite. In these applications, the increased dissolved solids contributed by sodium sulfate (the product of the sodium sulfite-oxygen reaction) can become a significant problem. Also, sulfite decomposes in high-pressure boilers to form sulfur dioxide (SO2) and hydrogen sulfide (H2S). Both of these gases can cause corrosion in the return condensate system and have been reported to contribute to stress corrosion cracking in turbines. Hydrazine has been used for years as an oxygen scavenger in high-pressure systems and other systems in which sulfite materials cannot be used. Hydrazine is a reducing agent that removes dissolved oxygen by the following reaction:

N2H4 + O2 ® 2H2O + N2
hydrazine   oxygen   water   nitrogen


Because the products of this reaction are water and nitrogen, the reaction adds no solids to the boiler water. The decomposition products of hydrazine are ammonia and nitrogen. Decomposition begins at approximately 400°F and is rapid at 600°F. The alkaline ammonia does not attack steel. However, if enough ammonia and oxygen are present together, copper alloy corrosion increases. Close control of the hydrazine feed rate can limit the concentration of ammonia in the steam and minimize the danger of attack on copper-bearing alloys. The ammonia also neutralizes carbon dioxide and reduces the return line corrosion caused by carbon dioxide.

Hydrazine is a toxic material and must be handled with extreme care. Because the material is a suspected carcinogen, federally published guidelines must be followed for handling and reporting. Because pure hydrazine has a low flash point, a 35% solution with a flash point of greater than 200°F is usually used. Theoretically, 1.0 ppm of hydrazine is required to react with 1.0 ppm of dissolved oxygen. However, in practice 1.5-2.0 parts of hydrazine are required per part of oxygen.

The factors that influence the reaction time of sodium sulfite also apply to other oxygen scavengers.  Rate of reaction as a function of temperature and hydrazine concentration. The reaction is also dependent upon pH (the optimum pH range is 9.0-10.0)