THPS Biocide (Tetrakis(hydroxymethyl)phosphonium Sulfate)
CAS Number: 55566-30-8
THPS (Tetrakis(hydroxymethyl)phosphonium Sulfate) is a broad-spectrum, environmentally acceptable biocide used for microbiological control in oilfield water injection systems, drilling fluids, and produced water. It is highly effective against sulfate-reducing bacteria (SRB), acid-producing bacteria (APB), and general heterotrophic bacteria at low dosages (50–500 ppm). THPS is also used as an iron sulfide (FeS) dissolver to remove scale deposits in oilfield systems.
Technical Specifications
| appearance | Clear colorless to pale yellow liquid |
| pH (as supplied) | 4.0–6.0 |
| active content (%) | 75 ± 2 |
| phosphorus content (%) | ≥8.5 |
| density (g/cm³, 20°C) | 1.30–1.35 |
Applications
- Oilfield water injection system biocide treatment
- Sulfate-reducing bacteria (SRB) control
- Iron sulfide scale dissolution and prevention
- Drilling fluid microbiological control
- Produced water biocide treatment
Key Features
- Effective against SRB, APB, and heterotrophic bacteria
- Unique dual function: biocide and iron sulfide dissolver
- Rapid biodegradation — acceptable for sensitive environments
- Non-oxidizing biocide with no halogen release
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