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Showing posts with label pbtc as corrosion inhibitor. Show all posts
Showing posts with label pbtc as corrosion inhibitor. Show all posts
Wednesday, August 25, 2021
Wednesday, July 3, 2019
PBTC as scale inhibitor
PBTC(PBTC 2-phosphonobutane-l,2,4-tricarboxylicacid),one of the most widely used scale inhibitors in the cooling water treatment industry.
PBTC is virtually stable to the effects of a variety of oxidizing microbiocides, including chlorine, bromine and others. PBTC shows excellent tolerance towards precipitation as its Ca salt. Precipitation in a 1000 ppm Ca2+ (as CaCO3)occurs after 185
ppm PBTC are present.
ppm PBTC are present.
Calcium carbonate and calcium phosphate(s) are the most frequently encountered deposits in industrial water systems. Their accumulation greatly diminishes effective heat transfer, interferes with fluid
flow, facilitates corrosion processes, and can worsen microbiological fouling. These phenomena are mostcritical in cooling water applications, where incoming water passes through a heat exchanger, cools a "hot"process and is sent back
to repeat the same cooling process after it is cooled by forced evaporation.
This water loss by evaporative cooling results in high supersaturation levels
of dissolved ions. Eventually, massive precipitation of sparingly soluble mineral
salts can occur, either in bulk or on a surface that, in some cases, causes catastrophic operational failures. These usually require chemical and/or mechanical cleaning of theadhered scale, in the aftermath of a scaling event. Silica and silicate salts are such examples.
flow, facilitates corrosion processes, and can worsen microbiological fouling. These phenomena are mostcritical in cooling water applications, where incoming water passes through a heat exchanger, cools a "hot"process and is sent back
to repeat the same cooling process after it is cooled by forced evaporation.
This water loss by evaporative cooling results in high supersaturation levels
of dissolved ions. Eventually, massive precipitation of sparingly soluble mineral
salts can occur, either in bulk or on a surface that, in some cases, causes catastrophic operational failures. These usually require chemical and/or mechanical cleaning of theadhered scale, in the aftermath of a scaling event. Silica and silicate salts are such examples.
Scale growth can be mitigated by use of scale inhibitors. They are key components of any chemical watertreatment added to process waters in "ppm" quantities and usually work synergistically with dispersant polymers. PBTC, HEDP (hydroxy- ethylidenediphosphonate) and AMP (amino-tris-methylenephosphonate) are "popular" and effectivecommercial scale inhibitors.
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PBTC can inhibit the formation of CaCO3 up to 350 ppm at a 60 ppm dosage level. PBTC is one of the most effective scale inhibitors.
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