- What is ZEELCHEM™ 121?
- ZEELCHEM™ 121 is PBTC (2-phosphonobutane-1,2,4-tricarboxylic acid, PBTCA) supplied as a 50 % solution.
- What is PBTC 50 used for?
- Main uses: high-ph, high-hardness cooling water, programmes with chlorine or bromine biocides, zinc-based corrosion inhibitor programmes, oilfield water reinjection.
- What is the typical dosage of PBTC 50?
- 4–15 mg/L (ppm) as product in cooling water; the final dose depends on water analysis. Use the dosing calculator on this page.
- What packaging is available?
- 65.0 kg net HDPE carboy.
- What is the price?
- Indicative price ₹ 180 per kg (ex-works Vadodara, GST extra), valid until 31-12-2026. Final price depends on quantity and delivery location; call +91-9724593964 for a firm quote.
- Do you deliver to my city?
- Yes. PBTC 50 is supplied Pan-India by road from Vadodara, Gujarat, to all states including Maharashtra, Tamil Nadu, Telangana, Delhi NCR, West Bengal and Madhya Pradesh.
- Who manufactures it?
- ZEEL PRODUCT, Vadodara, Gujarat, India — ISO 9001:2015, ISO 22000:2018 and ISO 14001:2015 certified. TDS, SDS and COA supplied.
Product overview
ZEELCHEM™ 121 is PBTC (2-phosphonobutane-1,2,4-tricarboxylic acid, PBTCA) supplied as a 50 % solution. Its structure combines one phosphonic group with three carboxylic groups, giving low phosphorus content together with outstanding scale inhibition at high temperature, high hardness and high pH, and excellent stability against chlorine and bromine.
PBTC outperforms conventional phosphonates in high-alkalinity, high-calcium cooling water and remains stable where oxidising biocides break down HEDP and ATMP. It is also an excellent zinc-salt stabiliser and therefore a key component of high-pH zinc programmes.
Its low phosphorus content helps operators meet discharge limits, while its high calcium tolerance makes it suitable for high-cycle operation, oilfield reinjection and bottle-washing and CIP detergents.
Key features & benefits
- Low phosphorus content; supports discharge compliance
- Superior CaCO₃ inhibition at high pH and high hardness
- Excellent chlorine and bromine stability
- Very high calcium tolerance
- Effective zinc-salt stabiliser
- Thermally stable for heat-exchanger surfaces
Applications
- High-pH, high-hardness cooling water
- Programmes with chlorine or bromine biocides
- Zinc-based corrosion inhibitor programmes
- Oilfield water reinjection
- Bottle washing and CIP detergents
- Industrial cleaning formulations
- RO antiscalant formulations
Technical specifications
| Appearance | Colourless to light-yellow transparent liquid |
|---|---|
| Active content (as PBTC) | ≥ 50.0 % |
| Phosphorous acid (as PO₃³⁻) | ≤ 0.8 % |
| Phosphoric acid (as PO₄³⁻) | ≤ 0.5 % |
| pH (1 % aqueous solution) | 1.5 – 2.0 |
| Density at 20 °C | ≥ 1.27 g/cm³ |
| Iron (as Fe³⁺) | ≤ 10 mg/L |
Values are typical specifications. Each consignment is supplied with a batch Certificate of Analysis. Custom specifications are available on request.
Dosage & method of use
4 – 15 mg/L in cooling water, usually blended with polymers such as ZEELCHEM™ 3100 or 7000. In detergents and CIP formulations, 0.5 – 3 % of the formulation is typical.
Dosing calculator
Estimates only. Evaporation is calculated as E = 0.00153 × R × ΔT (°C); blowdown B = E ÷ (COC − 1); product feed for cooling towers = B × dose. The right dose depends on your water analysis, metallurgy and operating conditions. Our technical team will confirm it free of charge.
Packaging
65.0 kg net HDPE carboy. Each carboy is labelled with product name, batch number, net weight and GHS hazard information.
Storage & shelf life
Store in original closed HDPE / stainless-steel containers in a cool, dry, well-ventilated and shaded area away from strong alkalis and oxidisers. Avoid freezing and prolonged direct sunlight. Shelf life: 12 months in unopened packing.
Handling & safety
Acidic product. Wear chemical goggles, nitrile/PVC gloves and protective clothing. In case of eye or skin contact, rinse with plenty of water for at least 15 minutes and seek medical advice. Refer to the ZEELCHEM™ SDS (GHS / CLP format) before handling.
Frequently asked questions
Why is PBTC used with chlorine biocides?
PBTC is far more resistant to degradation by chlorine and bromine than HEDP or ATMP, so it keeps working in systems with continuous oxidising biocide dosing.
Is PBTC a low-phosphorus scale inhibitor?
Yes. PBTC contains only one phosphonic group per molecule, giving lower phosphorus content than HEDP, ATMP or DTPMP.
What is the CAS number of PBTC?
The CAS number of 2-phosphonobutane-1,2,4-tricarboxylic acid is 37971-36-1.
What is the typical dosage of PBTC 50?
4–15 mg/L (ppm) as product in cooling water; the final dose depends on water analysis. Use the dosing calculator on this page.
What packaging is available?
65.0 kg net HDPE carboy.
What is the price?
Indicative price ₹ 180 per kg (ex-works Vadodara, GST extra), valid until 31-12-2026. Final price depends on quantity and delivery location; call +91-9724593964 for a firm quote.
Do you deliver to my city?
Yes. PBTC 50 is supplied Pan-India by road from Vadodara, Gujarat, to all states including Maharashtra, Tamil Nadu, Telangana, Delhi NCR, West Bengal and Madhya Pradesh.
Who manufactures it?
ZEEL PRODUCT, Vadodara, Gujarat, India — ISO 9001:2015, ISO 22000:2018 and ISO 14001:2015 certified. TDS, SDS and COA supplied.