Buffer Cleaner
Oman Chemical is leading one Largest Supplier, Manufacture a
Your shopping cart is empty.
Sampling And Testing
A sample of boiler water should be drawn for analysis daily. The sample should always be taken from the same point after blow down, cooled and tested immediately. Fill the Boiler Water Log Form according to result. It is important that regular testing is carried out to ensure levels of treatment are correct.
Physical Properties :
Appearance :Liquid
Corrosive action :None
pH 1% solution :8.8
Flash point :None
Phosphate/pH relationship recommended to control boiler corrosion. Different forms of phosphate consume or add caustic as the phosphate shifts to the proper form. For example, addition of monosodium phosphate consumes caustic as it reacts with caustic to form disodium phosphate in the boiler water according to the following reaction:
| NaH2PO4 | + | NaOH | -> | Na2HPO4 | + | H2O |
| monosodium phosphate | sodium hydroxide | disodium phosphate | water |
Conversely, addition of trisodium phosphate adds caustic, increasing boiler water pH:
| Na3PO4 | + | H2O | -> | Na2HPO4 | + | NaOH |
| trisodium phosphate | water | disodium phosphate |
sodium hydroxide |
Testing control procedure
The presence of alkalinity in a water sample may be due to many different substances. However, for the sake of simplicity, the presence of bicarbonate, carbonate, and hydroxide ions is commonly considered as alkalinity. The points of change in colour of phenolphthalein and methyl orange indicators, which occur at pH 8.3 and pH 4.3 provide standard reference points which are almost universally used to express alkalinity.
Very high alkalinity values can be undesirable in an industrial water supply. For example, the presence of a high methyl orange alkalinity should be avoided in boiler feed water because of the resultant carbon dioxide content of the steam. Carbon dioxide usually is responsible for the corrosion of steam and return lines. High boiler water alkalinities are also undesirable because the presence of high hydroxide ion concentration is the primary cause of caustic metal embrittlement. A very high boiler alkalinity can also lead to an undesirable carryover condition. On the other hand, the alkalinity of boiler water must be sufficiently high to protect the boiler metal against acidic corrosion and to ensure precipitation of scale-forming salts. Usual treatment approaches include setting both a minimum alkalinity level and an operating range.
Hydroxide alkalinity may be determined by adding barium chloride prior to titration to precipitate the carbonate ion from solution, allowing direct titration of the hydroxide alkalinity. Measurement of hydroxide alkalinity is also used to control lime soda softeners.
In cooling water systems, alkalinity is of major importance since the total alkalinity of a water is one factor that must be considered when predicting the tendency for the water to precipitate calcium carbonate scale. Depending on the choice of chemical treatments to protect against corrosion and scale formation, the operating alkalinity and pH ranges are chosen to balance these two features.
Alkalinity Titrimetric Method (0-200 ppm)
Principle Theory
This test is based on the determination of alkalinity by titration with standard acid to the phenolphthalein color change (or to a pH of 8.3) and to the methyl orange color change (or a pH of 4.3). For determination of hydroxide alkalinity only, barium chloride is added prior to titration to precipitate the carbonate ions. Titration is then taken only to the phenolphthalein end point. A pH meter may be used instead of the indicators to determine the end points of the titration.
Boiler Water Treatment products
CHARACTERISTIC :
Basic Boiler System Schematic
Below is a summary of problems associated with the common impurities in water and solutions to each problem.
List Of Problems Caused By Impurities In Water
|
Impurity (Chemical Formula) |
Problems |
Common Chemical Treatment Methods |
|
Alkalinity (HCO3-, CO32- and CaCO3) |
Carryover of feedwater into steam, produce CO2 in steam leading to formation of carbonic acid (acid attack) |
Neutralizing amines, filming amines, combination of both, and lime-soda. |
|
Hardness (calcium and magnesium salts, CaCO3) |
Primary source of scale in heat exchange equipment |
Lime softening, phosphate, chelates and polymers |
|
Iron (Fe3+ and Fe2+) |
Causes boiler and water line deposits |
Phosphate, chelates and polymers |
|
Oxygen (O2) |
Corrosion of water lines, boiler, return lines, heat exchanger equipments, etc. (oxygen attack) |
Oxygen scavengers, filming amines and deaeration |
|
pH |
Corrosion occurs when pH drops below 8.5 |
pH can be lowered by addition of acids and increased by addition of alkalies |
|
Hydrogen Sulfide (H2S) |
Corrosion |
Chlorination |
|
Silica (SiO2) |
Scale in boilers and cooling water systems |
Lime softening |
We carry a complete line of condensate treatment chemicals. Condensate treatment chemicals are used to increase the condensate pH, thus reducing corrosion to the entire boiler steam system. The most common product is a tri-blend amine of cyclohexylamine, morpholine, and diethylaminoethanol (DEAE) neutralizing amines, although we do have standard RXSOL products or we can custom blend to your needs.
RXSOL-50-5005-DCM1 10% DEAE, 10% Cyclo, 10% Morpholine
RXSOL-50-5005-DCM2 20% DEAE, 20% Cyclo, 20% Morpholine
RXSOL-50-5005-C 20% Cyclohexylamine
RXSOL-50-5005-D 20% DEAE
RXSOL-50-5005-M 20% Morpholine
RXSOL-50-5005-C5 50% Cyclohexylamine
RXSOL-50-5005-D 50% DEAE
RXSOL-50-5005-M5 50% Morpholine
RXSOL-50-5005-CC alkaline and the vapors are irritating to eyes and lungs. Avoid contact with eyes and skin. Do not take internally. Observe safety regulations wear Goggles, PVC gloves and Apron when handling Provide ample ventilation Avoid contact with skin in case of contacts wash with cupious amount of water immediately. If eyes are splashed give immediate and prolonged irrigation with clean running water and obtain medical attention.
Not for internal use :-
If swallowed do not induce vomiting give plenty of water or milk and call a doctor immediately.
Packing. GENERAL REMARKS:-Do not store RXSOL-50-5005-CA near a heating equipment.
Specifications of Disodium EDTA
Product Name : Disodium EDTA.
Product Category : Ethylene Diamine Tetra Acetic Acid Derivatives.
CAS No. : 139-33-3 (Anhydrous); 6381-92-6 (Dihydrate).
HSN No. : 29173990.
Synonyms : Ethylenediaminetetraacetic Acid Disodium Salt, N,N'-1,2-ethanediylbis(N-(carboxymethyl)glycine) edetic acid Disodium Salt, Disodium Edetate, Metaclaw, Trilon B, Versene 220, Dissolvine, Titriplex, etc.
Molecular Formula : C10H14O8N2Na2.2H2O.
Molecular Weight : 372.2.
Appearance : White Crystalline Powder.
Solubility : Soluble In Water, Clear Solution.
Assay : 99.0% Min.
pH : 4.0 - 6.0.
Chelation Value as mg. of CaCO3 : 270.0.
Uses / Application of Disodium EDTA
Disodium EDTA is a Sequestering Agent, which is used in various Industries such as Pharmaceutical, Photography, Textile, Boiler Turbine scale removal, Agriculture. It is used for removing unwanted inorganic impurities present in the system, which helps in getting superior performance & cost saving.
| PRODUCT NAME | : | DIETHYLAMINOETHANOL |
| CAS number | : | 100-37-8 |
| UN number | : | 2686 |
| Formula | : | (C2H5)2NCH2CH2OH |
| Odour | : | |
| Solubility in water | : | COMPLETE |
| Density | : | 0.880 at 20 oC |
| Boiling point | : | 161 oC |
| Melting point | : | -70 oC |
| Viscosity | : | |
| Flashpoint | : | 60 oC |
| Explosive limits | : | |
| Vapour pressure | : | 1.9 mbar at 20 oC |
| Skin absorption/irritation | : | YES |
| TLV Country NL Year 1995 | : | 10 S ppm 50 S mg/m3 |
| Pollution category 1994 | : |
C |
Never use DEAE in an open ventilation system, its oily residue can deposit on all available surfaces and results oil residue deposition. DEAE produces an oily residue which can soften varnishes.
Physical Properties:-
| Appearance | Opaque Liquid |
| Odor | CHARACTERISTIC |
| pH (1% Solution) | 10 - 11 |
| Specific Gravity | 1.1 |
| Solubility in Water | 100 % water miscible |
|
||||||||||||||||||||||||||||||||||||
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.
The following operational conditions necessitate the use of catalyzed sodium sulfite:
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 scave
We are marine chemical supplier since 1996.These Marine Chemicals include different sets of products such as Tank Cleaners, Maintenance Chemicals, Cooling Water Treatment Chemicals, Boiler Water Treatment Chemicals, Fuel Additives, etc.
Oman Chemical is leading one Largest Supplier, Manufacture a
Oman Chemical is leading one Largest Supplier, Manufacture a
