PBTC 50%
2-Phosphonobutane-1,2,4-Tricarboxylic Acid with superior calcium tolerance up to pH 9.5 and complete 100% resistance to chlorine and oxidizing biocides. Prevents zinc precipitation in all-organic cooling programs.
Technical Specification Target
High-Stress Chlorine Tolerance & Zinc Stabilization
Standard phosphonates degrade into orthophosphate in the presence of free chlorine (>0.5 ppm), causing calcium phosphate scaling. PBTC contains unique carboxylic and phosphonic groups providing total immunity to oxidizing halogens.
In alkaline cooling systems (pH 8.0 to 9.2), PBTC prevents zinc hydroxide precipitation, keeping corrosion inhibitor ions dissolved in active circulation.
Standard Industrial Dosage
| Application | Recommended Dosing |
|---|---|
| High Cycles of Concentration Cooling | 5.0 – 15.0 ppm |
| Zinc Stabilization Corrosion Formulations | 3.0 – 8.0 ppm |
| Closed Chilled Water Loops | 10.0 – 25.0 ppm |
| Industrial Detergents & Cleaners | 0.5 – 2.0% |
Packaging, Handling & Storage
- Packaging Options: 60 kg HDPE carboys, 250 kg virgin HDPE drums, 1,250 kg IBC containers, and bulk tankers.
- Storage Conditions: Store in tightly closed containers in a dry, ventilated area away from direct sunlight.
- Shelf Life: 24 months in sealed original packaging.
- Handling Safety: Mildly acidic. Standard PPE (gloves, safety goggles) required.
Frequently Asked Questions: PBTC 50%
Expert technical answers on dosing, chemistry, handling, and application performance.
Q1. What is PBTC 50% and why is it superior in alkaline cooling water?
PBTC (2-Phosphonobutane-1,2,4-Tricarboxylic Acid, CAS 37971-36-1) possesses both phosphonic and carboxylic groups, giving it 100% resistance to chlorine and superior scale inhibition at high pH and high hardness.
Q2. What is the standard dosage of PBTC 50% in industrial systems?
In high-cycles open cooling towers, dosing ranges from 5.0 to 15.0 ppm active. In zinc stabilization programs, 3.0 to 8.0 ppm is used to keep zinc in solution.
Q3. How does PBTC compare to HEDP and ATMP?
PBTC has much higher chlorine tolerance than HEDP and ATMP, does not precipitate easily with high calcium concentrations, and operates effectively up to pH 9.5.