How to use HEMPA？

HEMPA (Hydroxyethylidene Diphosphonic Acid) is a highly effective phosphonate-based scale and corrosion inhibitor, commonly used in water treatment, oilfield applications, and industrial cleaning. Below is a guide on how to use HEMPA effectively:

1. Typical Applications of HEMPA

Scale Inhibition (CaCO₃, CaSO₄, BaSO₄, Fe₂O₃)

Corrosion Inhibition (for metals like steel, copper, and alloys)

Chelating Agent (binds to metal ions like Ca²⁺, Mg²⁺, Fe³⁺)

Oilfield Applications (prevents scale in drilling fluids & pipelines)

Industrial Cleaning (removes rust and mineral deposits)

2. Dosage Recommendations

The dosage depends on water chemistry and system conditions. General guidelines:

Application Dosage (ppm - parts per million)

Cooling Water Systems 5–20 ppm (continuous dosing)

Boiler Water Treatment 10–30 ppm

Oilfield Scale Inhibition 20–50 ppm

Industrial Cleaning 0.5–2% (by weight in cleaning solution)

Detergent Additive 0.1–1% (for chelation)

Note:

Higher dosages may be needed in high-hardness or high-iron water.

For closed-loop systems, lower doses (5–15 ppm) are often sufficient.

3. How to Apply HEMPA

A. Water Treatment (Cooling/Brine Systems)

Dilute HEMPA in water (if using concentrated acid form, neutralize with NaOH for better solubility).

Inject continuously via dosing pump into the water stream.

Monitor pH (optimal range: 6–9; adjust with alkali if needed).

Combine with other inhibitors (e.g., zinc, molybdate, or polymers like PAA for enhanced corrosion/scale control).

B. Oilfield Scale Control

Add to drilling fluids or injection water (20–50 ppm).

Works synergistically with phosphates or polyacrylates.

C. Industrial Cleaning

Mix 0.5–2% HEMPA with water and a surfactant.

Circulate or soak equipment to dissolve rust/mineral deposits.

Rinse thoroughly after cleaning.

4. Compatibility & Safety

Compatible with: Most polymers (e.g., PAA, PBTC), biocides, and oxidizing agents (at moderate levels).

Avoid mixing with: Strong acids (unless diluted) or high concentrations of hypochlorite (can degrade HEMPA).

Safety:

Wear gloves & goggles (mildly acidic).

Store in plastic containers (avoid metal corrosion).

Biodegradable but should be handled responsibly.

5. Advantages Over Alternatives

Better thermal stability than ATMP/EDTA.

Excellent scale inhibition at low dosages.

Works in high-pH and high-temperature conditions (up to 200°C).

6. When to Choose HEMPA Over HEDP?

If you need better Fe³⁺ stabilization (HEMPA is superior in high-iron water).

For high-temperature systems (HEMPA degrades slower than HEDP).

If cost is a concern (HEMPA is often cheaper than HEDP).