Antiscale & Corrosion Inhibitors For Aqueous Sys – Exacta-1000-P

EXACTA-1000-P

ANTISCALE & CORROSION INHIBITORS FOR AQUEOUS SYSTEMS

Introduction:

This product relates to a new class of scale and corrosion inhibitors, based on elemental phosphorus and carboxylate chemistry, to inhibit corrosion in ferrous metal aqueous systems or water containing systems.

Localized corrosion such as pitting may pose a greater threat to the normal operation of the system than general corrosion because such corrosion will occur intensely in isolated small areas and is much more difficult to detect and monitor than general corrosion. Localized corrosion may cause perforation quickly and suddenly without giving any easily detectable early warning. Obviously, these perforations may cause leaks that may require unscheduled shutdown of the industrial aqueous system. Sudden failure of equipment due to corrosion could also result in environmental damage and/or present a serious threat to the safety of plant operations.

The product EXACTA-1000-P is a more cost-effective antiscalant and corrosion inhibitor—capable of inhibiting both localized and general corrosion—that is environmentally benign and halogen stable, can maintain its effectiveness in high stress (i.e., long HTI, high Ca2+, etc.) conditions and can also prevent scale formation.

This product is much better comparative to other corrosion inhibitors available as well as costs low and can be used alone or in combination with the conventional products used.

Application:

• Cooling water systems
  (open re-circulating, closed, and once-through systems);
• Systems used in petroleum production and refining
  (well casing, transport pipelines, etc., geothermal wells, and other oil field applications);
• Boilers and boiler water systems;
• Systems used in power generation;
• Mineral process waters including mineral washing, flotation and benefaction;
• Paper mill digesters, washers, bleach plants, white water systems and mill water systems;
• Black liquor evaporators in the pulp industry;
• Gas scrubbers and air washers;
• Continuous casting processes in the metallurgical industry;
• Air conditioning and refrigeration systems;
• Building fire protection heating water;
• Water reclamation and purification systems;
• Membrane filtration water systems;
• Food processing streams and waste treatment systems;
• Clarifier, liquid-solid applications, municipal sewage treatment systems;
• Industrial or municipal water distribution systems;

EXACTA-1000-P is superior than other products mentioned below: Refer table below:

• Metallic ion corrosion inhibitors (CrO4-2, MoO4-2, and Zn2+) have been found to be toxic and detrimental to the environment and their use in open recirculation cooling water systems is generally restricted.
• Inorganic phosphates also contribute to scale formation (like calcium phosphate, iron phosphate and Zinc phosphate salts) if used improperly. It also requires a robust treatment program and frequent testing and monitoring in order to obtain satisfactory corrosion protection and scale control at the same time.
• Organic phosphonates, (PBTC, HEDP, and ATMP) have also been used as corrosion inhibitors in various chemical treatment formulations. The effectiveness of these phosphonate base treatments, however, is generally substantially lower than the treatments based on inorganic inhibitors.
• Hydroxycarboxylic acids such as gluconic acid, sacharic acid, citric acid, tartaric acid and lactobionic acid are prone to microbiological growth being they are neutrients for bacteria growth and their corrosion inhibition effectiveness is also much lower than the inorganic corrosion inhibitors.
• HPA is not halogen stable and it will revert to orthophosphate in the presence of halogen based biocides and also HPA is found to be a relatively ineffective CaCO3 scale inhibitor.

In comparison with above products, EXACTA-1000-P is a new and very effective product based on phosphorus and carboxylate molecule chemistry. It is an organic scale and corrosion inhibitor in nature. The product can be formulated with other components typically used in formulations like polymer, orthophosphate, etc. to provide the most cost-effective scale and corrosion control.

Dose:

The product is added to the aqueous system in an amount of from 0.1 to about 10,000 ppm, preferably from about 0.2 to 100 ppm.

Tests to determine corrosion rate:

A pre-polished carbon steel (mild steel, C1010 or C1008).

Corrosion Inhibitor Test Results-Hard Water.

360 ppm CaCl2, 200 ppm MgSO4, 100 ppm NaHCO3, pH = 8.4,

50°C. 160 rpm, 16 hours immersion.

Note:

HPA = 2-hydroxy-phosphonacetic acid.

HEDP = 1-hydroxyethylidene-1,1-diphosphonic acid.

AMP = Amino tri(methylene phosphonic acid).

PBTC = 2-phosphono-butane-1,2,4-tricarboxylic acid.

Polymer 1 = Acrylic acid /acrylamide / sulfonate terpolymer.

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