Kemtech Engineers

Kemtech Engineers

Chennai, Tamil Nadu
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Chlorine Dioxide Technology

Ball Bearing
Chlorine dioxide is ideal for industrial waters and as a disinfectant in drinking water.Advantages of chlorine dioxide
  • The bactericidal efficiency of chlorine dioxide is independent of pH values between 4 and 10
  • Chlorine dioxide is superior to chlorine in the destruction of spores, bacteria's, viruses and other pathogen organisms on lower dosage
  • The required contact time for ClO2 is lower
  • Chlorine dioxide has better solubility
  • Chlorine dioxide does not react with NH3 or NH4+
  • It destroys THM precursors and increases coagulation
  • Chlorine dioxide is also effective at controlling algae, slime and biofilm found in cooling water, process water, and paper mill whitewater systems
  • In potable water applications it is a proven technology for improving taste and removing odors, algae, decaying vegetation, odor-producing phenolic compounds, mercaptans, and disubstituted organic sulfides
Chlorine dioxide can be safely generated by three different technologies Generation I: Chlorine-DrewchlorCl2 + H2OHOCl + HCl2NaClO2 + HOCl + HCl2ClO2 + H2O + 2NaClNet:2NaClO2 + Cl22ClO2 + 2NaClGeneration II: Acid - Sodium Hypochlorite - DrewchlorNaOCl + HClHOCl + NaClNaClO2 + HOCl + HCl2ClO2 + H2O + 2NaClNet:2NaClO2 + NaOCl + 2HCl2ClO2 + H2O + 3NaClGeneration III: Acid - Drewchlor5NaClO2 + 4HCl4ClO2 + 5NaCl + 2H2O
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Cooling Water Treatment

Cooling water treatment programs are designed to achieve control of corrosion and scale as well as microbiological fouling and contamination in open re-circulating system, closed re-circulating system and in once through cooling system.Corrosion and scale lead to:
  • Leakage in exchangers
  • Unscheduled shutdown
  • Reduction in water flow
  • Loss of production
  • Poor heat transfer
  • Reduction in plant load
Microbiological growth also leads to microbiological induced corrosion, damage to wooden parts of cooling tower.Our wide arrays of products are designed to achieve the following:
  • Controlled corrosion
  • Enhanced equipment and pipeline life
  • No microbiological fouling
  • No shutdown/production losses
  • Greater water conservation
Sub divisions of Cooling Water Treatment:1) Corrosion inhibitorsThe corrosion process:Corrosion is an electrochemical process in which a difference in electrical potential develops between two metals or two parts of a single metal. This difference in potential allows current to pass through the metals causing reactions at anodic and cathodic sites. Anode is the region of lower potential whereas cathode is the region of higher potential. At anode, metal ions go into solution. The lower the potential of anode, the greater the amount of metal dissolution and more serious the corrosion problem. Most common types of corrosion include the general corrosion, pitting type corrosion, galvanized corrosion, stress corrosion cracking, crevice corrosion and erosion corrosion. Corrosion in water is accelerated by chloride, dissolved oxygen in water, high temperature, suspended solids, bacteria and low water pH.
Corrosion inhibitors are substances which when added in small amounts to a corrosive medium, reduce the rate of corrosion. Inhibitors are classified as anodic, cathodic or both depending on which portion of the electrochemical corrosion cell they disrupt or polarize.Types of corrosion inhibitors include oxide film types which include nitrite and molybdate based. They may also form insoluble salts with ions in water or with the protected metal ion e.g. polyphosphates, orthophosphates, phosphonates, zinc etc. or the aromatic azole types.
  • Anodic inhibitors - nitrite, silicate, orthophosphate
  • Cathodic inhibitors - Polyphosphates, Zinc, calcium carbonate
  • Both - filming amines, phosphonates
Choice of suitable inhibitor depends on the cooling system design parameters, water composition, type of metals in the system, stress conditions, water velocity pH, dissolved oxygen and salt and suspended matter composition. 
2) Scale/Deposit controllersDeposits are a conglomeration of many constituents that can range from settled silt form airborne dust blown into the cooling tower to precipitated hardness salts which result from changes in temperature or in concentration characteristics of make-up water. Typical components of scale found in cooling water systems include calcium carbonate, calcium sulphate, calcium and zinc phosphate and silica and magnesium silicate. These scale components tend to deposit and adhere as scale on heat transfer surfaces with higher temperature because their solubilities decrease as pH and water temperature increase.Since the thermal conductivity of the scale is extremely low in comparison with that of the tube material, the scale adhesion lowers the thermal efficiency of the heat exchangers.Cooling water deposit control agents function via Crystal growth distortion, Dispersion, Sequestration etc.The present popular scale inhibitors include:
  • Phosphonates
  • Phosphono-carboxylates
  • Organic acids
  • Polymers
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Boiler Water Treatment

The water used for boilers usually contains various substances such as suspended solids, dissolved solids and gases. When used directly such raw water results in problems such as scale, corrosion, carryover, etc. in the boiler and accessory equipment. In low pressure boilers usually there are problems of hardness and silica scale and corrosion due to dissolved oxygen throughout the system and corrosion due to carbon-dioxide in the condensate line. In medium and high pressure boilers, metal oxides are deposited on the heating surface, corrosion of accessory and scale problem in the superheater and turbines, etc.Deposits directly reduce heat transfer, causing higher fuel consumption, high metal temperatures and eventually failures. Corrosion not only results in failure at the point of attack, but also produces serious levels of metal oxide contamination, which in turn may cause deposits elsewhere. Carryover results in superheater turbine and condensate system deposits, corrosion and/or erosion problems.Therefore the three main objectives of a boiler water treatment program are to:
  • Prevent formation of deposits
  • Reduce corrosion of metals
  • Prevent boiler water carryover
Boiler CompoundsBoiler compounds have two functions: preventing scale formation and adjusting pH of boiler water to inhibit corrosion.Treatment with phosphate based boiler compoundsPhosphate base boiler compounds contain Phosphate and alkali agents. Both these compounds prevent scale formation by reacting with hardness components (Ca&Mg) and converting them into suspensible substances and by keeping silica substances water soluble.Treatment with non-phosphate based boiler compounds includes polymers and chelating agents.Oxygen ScavengersOxygen scavengers viz sodium sulfite, Hydrazine, etc remove dissolved oxygen in water by a reduction reaction. CAWTL’s patented product Mekor 70 passivates metal surfaces through the formation of magnetite and cuprous oxide films, minimization of iron and copper deposits in the boiler and ability to provide corrosion protection to after boiler sections of the system.Corrosion protection in boilers is achieved by neutralizing and filming amines. Neutralizing amines inhibit corrosion by controlling the condensate pH. Filming amines form a water repellent film on metal surface which prevents direct contact with the corrosive substances like oxygen and carbon-dioxide.Oxygen ScavengersKem BLR 10Kem BLR 100Mekor 70Amerzine 35Steam condensate corrosion inhibitorKem BLR 17Kem BLR 32Amercor seriesMekor 70Fuel Oil TreatmentOur Amergy range of fuel additives are used to improve the operating efficiency of the fireside (furnace) of boilers. These are a blend of multifunctional organometallic combustion catalysts, selected solvents, dispersants and emulsifying agents.These fuel additives improve fireside conditions by:
  • Catalyzing combustion
  • Reducing excess air
  • Improving atomization
  • Decreasing smoking
  • Decreasing slag formation
  • Emulsifying moisture
  • Decreasing corrosion
  • Dispersing sludges
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Waste Water Treatment

In the area of waste water management, we possess a complete range of products at highly competitive prices and offer on-site technical service & trouble shooting capabilities. Our total treatment approach integrates chemical treatment, state-of-the-art feeding & control technology and a commitment to outstanding customer service.

Application Areas:
  • Clarification
  • KEMFLOC, AMERFLOC, DREWFLOC CHARGEPAC and PERFORMAX polymers comprise a complete range of organic, inorganic & blended coagulants and high-performance flocculants, which improve clarification, thickening, flotation and dewatering operation efficiency.
  • De-emulsification
  • A broad line of emulsion breakers "break" emulsions into the oil, water and solids phases.
  • Foam Control
  • DREWPLUS foam control agents are used to suppress, eliminate, control or prevent foam.
  • Metals Precipitation
  • AMERSEP metals precipitants are organosulfur-based compounds that remove metals in solution by a metal-AMERSEP precipitant complex and quickly precipitate to form solutions. These products are often used with CHARGE PAC coagulants and/or DREWFLOC flocculants
  • Odor Control
  • AMERSCENT neutralizing agents and ENZYBATE odor control agents prevent odors at the plant site, downstream of the discharge point, and at the sludge landfill. Our patented GENEROX TM chlorine dioxide generator system is used for oxidation odor control.
  • Sludge Dewatering
  • KEMFLOC, AMERFLOC, AMERSEP & CHARGEPAC coagulants, and DREWFLOC flocculants are used to achieve maximum throughout, clean filtrate and/or high cake solids. We can tailor the most cost-effective program for any application.
  • Slop Oil Treatment/ Recovery
  • Our emulsion breakers, coagulants and flocculants are used to treat oily wastewater and oily skimming in refineries & petrochemical plants, automotive parts & appliance manufacturers, can-stamping plants, foundries, steel mills, aluminum casting plants and food processing plants.
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Maintenance Chemicals

Preventative, predictable maintenance programs are moving to the forefront of priorities while contributing to the bottom line. Our investment protection programs consist of effective, simplified maintenance programs proven to maximize system performance, while extending equipment life. Applications include the removal of insulating deposits to improve efficiency, the protective storage of idle equipment, or the removal of carbonized deposits, oils and greases.The principle goals achieved through our investment protection programs are summarized in the program's value statement:
  • Driving reliability
  • Maximizing performance
  • Improving ROI
These goals are achieved through predictable, preventable, comprehensive maintenance programs. Investment protection programs utilize a broad range of cleaners and inhibitors, including:
  • FERRO CLEAN- neutral cleaning treatment
  • ADJUNCT - G galvanized inhibitor
  • PROTECSOL- corrosion inhibitors for idle equipment
  • LAC -alkaline cleaner
  • SAF-ACID descalant
  • DREWCLEAN - RO cleaner
  • ENVIROMATE- 2000 general purpose cleaner
  • DREWFRESH- 2000 heavy -duty cleane
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Reverse Osmosis Chemicals

Reverse Osmosis (RO) is increasingly becoming the technology of choice for many water treatment applications. When operating this system, several problems, such as membrane fouling, performance loss, quality control, can be encountered. We can be your supplier for added value to guarantee a well optimized membrane operating system.
  • Pretreatment
  • AMERFLOC and CHARGEPAC polymers are proven coagulants for optimal removal of all kinds of colloidal matter before it enters the first stage of the membrane separation system. AmeROyal RCR residual chlorine remover will neutralize chlorine and other oxidizing agents in the feed water, prior to contact with sensitive membrane systems.
  • Antiscalants
  • Depending on feedwater quality, system data, and desired performance, a number of different AmeROyal antiscalants can be applied. Our goal is to keep the membrane surface clean and to assure high efficiency for longer operational periods. The survey data, RO software package and the technical expertise of our engineers provide the best recommendation for each application.
  • Cleaners
  • Our wide range of AmeROyal C-series membrane cleaners provide our customers with focused solutions for maintaining system performance. Cleaning with these products, following proper cleaning procedures, optimizes membrane performance.
  • Biocontrol
  • A membrane separation unit can fail due to the uncontrolled presence of microorganism, known as biofouling. BlOSPERSE microbiocides and AmeROyal C-series membrane cleaners will prevent problems due to biofouling.
  • On-site services
  • These services range from technical training to assistance in solving membrane-related problems. Periodical follow-up of water quality and system performance will lead to optimum water treatment of the membrane.
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Dust Control Chemicals

CAWTL offers its mineral processing customers a total solutions capability:
  • Dust suppression:
  • Drewgard dust suppression technology is highly effective in maintaining environmental compliance and employee health and safety where process generated dust is an issue. This treatment is very effective in reducing maintenance costs, improving mineral recovery and conserving water resources.
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Foaming is generally undesirable as it disturbs production sequences in which liquids particularly water, have an important function as transporting media. Foaming can lead to lower production yields and finished products of poor quality. Chembond Ashland offers ANTISPUMIN range of deformers which have been working successfully in industries such as Asbestos, Sugar, Paper, Dyes, Biotech, Lubricants, Drawing Oil Emulsion, etc.
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Kemtech Engineers Plot No. 95, Door No. 21 4th Main Road, 2nd Cross Street, Thanikachalam Nagar,
Chennai-600110, Tamil Nadu, India

V. Mahendiran ( Managing Director )
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