DTPMPA User Manual

While a commercial product would come with a specific datasheet from the manufacturer, this guide serves as a comprehensive Generic User Manual for DTPMPA (Diethylene Triamine Penta Methylene Phosphonic Acid).

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DTPMPA (Diethylene Triamine Penta Methylene Phosphonic Acid) Generic User Manual

Version: 1.0
Date: October 26, 2023

1. Product Identification

• Chemical Name: Diethylene Triamine Penta Methylene Phosphonic Acid

• Common Abbreviation: DTPMPA

• CAS No.: 15827-60-8

• Molecular Formula: C₉H₂₈N₃O₁₅P₅

• Typical Form: Aqueous solution (typically 50% active content)

• Appearance: Clear, pale yellow to brownish-yellow liquid

2. Hazards Identification

Precautionary Statements:

• P280: Wear protective gloves/ protective clothing/ eye protection/ face protection.

• P301 + P330 + P331: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.

• P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

• P310: Immediately call a POISON CENTER or doctor/physician.

3. First-Aid Measures

• Inhalation: Move to fresh air. If breathing is difficult, give oxygen. Seek medical attention.

• Skin Contact: Remove contaminated clothing. Wash immediately with plenty of soap and water for at least 15 minutes. Seek immediate medical attention.

• Eye Contact: Rinse cautiously with water for at least 15 minutes, holding eyelids open. Seek immediate medical attention.

• Ingestion: Do NOT induce vomiting. Rinse mouth with water. Never give anything by mouth to an unconscious person. Seek immediate medical attention.

4. Handling and Storage

• Handling:

  • Use only in well-ventilated areas.

  • Avoid contact with eyes, skin, and clothing.

  • Wear appropriate personal protective equipment (PPE): chemical-resistant gloves (e.g., Nitrile), safety goggles or face shield, and protective clothing.

  • Do not eat, drink, or smoke when using this product.

• Storage:

  • Store in a cool, dry, well-ventilated place.

  • Keep container tightly closed.

  • Store in a HDPE (High-Density Polyethylene) or PP (Polypropylene) plastic container, or in lined steel containers. Avoid contact with carbon steel and other incompatible metals for long-term storage.

  • Keep away from strong oxidizers and strong bases.

5. Physical and Chemical Properties

6. Intended Use and Application

DTPMPA is a high-performance scale and corrosion inhibitor used primarily in industrial water treatment systems.

Key Functions:

1. Scale Inhibition: Excellent inhibitor for calcium carbonate (CaCO₃), calcium sulfate (CaSO₄), and barium sulfate (BaSO₄) scales.

2. Corrosion Inhibition: Functions as an anodic corrosion inhibitor for carbon steel, with a powerful synergistic effect when combined with zinc salts.

3. Chelation: Strong chelating agent for di- and trivalent metal ions (e.g., Ca²⁺, Mg²⁺, Fe³⁺).

Typical Application Areas:

• Industrial Cooling Water Systems (open and closed loops)

• Oilfield water flooding and well treatment

• Reverse Osmosis (RO) membrane systems

• Boiler water treatment (low-pressure)

7. Dosage and Dilution

Important: The optimal dosage is highly dependent on your specific water chemistry (calcium hardness, alkalinity, pH, temperature) and system parameters. The following are general guidelines.

• As a Scale Inhibitor:

  • Cooling Water: 5 – 30 mg/L of the active product (DTPMPA 50%) in the circulating water.

  • RO Antiscalant: 2 – 10 mg/L of the active product, fed upstream of the membrane. A thorough compatibility test is mandatory.

• As a Corrosion Inhibitor (in a blend with Zinc):

  • Typically used at a DTPMPA (50% active) to Zinc (as Zn²⁺) ratio between 1:1 to 3:1.

  • Total treatment levels typically range from 10 – 50 mg/L of the formulated product.

• Dilution:

  • DTPMPA is miscible with water and can be diluted as needed for ease of feeding.

  • Always add DTPMPA to water, not water to DTPMPA, to minimize heat generation and splashing of the concentrated acid.

8. Feeding Instructions

1. Use a chemical feed pump (e.g., diaphragm pump) made from materials compatible with acidic chemicals (e.g., PVC, PP, SS 316).

2. The injection point should be in an area of good mixing, such as the suction side of the cooling water pump or in a well-mixed chemical mixing tank.

3. Continuous feeding is preferred for consistent control.

9. Monitoring and Control

• Scale Control: Monitor system parameters like calcium hardness, alkalinity, and conductivity. Regularly inspect heat exchangers for scale.

• Corrosion Control: Use corrosion coupons or a real-time corrosion meter to monitor corrosion rates. The target for mild steel is often < 2 mils per year (mpy).

• Residual Monitoring: Monitor the residual level of phosphonate in the system water using a Hach test kit or HPLC to ensure the dosage is correct.

10. Incompatibilities and Stability

• Incompatible Materials: Strong oxidizing agents (e.g., chlorine, hypochlorite), strong bases. High concentrations of chlorine will degrade DTPMPA.

• Metals: Concentrated DTPMPA is corrosive to carbon steel, copper, and aluminum. Dilute solutions are less aggressive.

• Stability: Chemically stable under recommended storage and handling conditions.

11. Disposal

• Dispose of in accordance with all local, regional, and national regulations.

• Small quantities of diluted product can often be neutralized and flushed to a chemical drain. For large quantities, contact a licensed waste disposal company.

• Do not release into the environment.

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Disclaimer: This is a generic manual for informational purposes only. The user must obtain and follow the specific Safety Data Sheet (SDS) and technical instructions provided by their DTPMPA supplier. Always conduct a compatibility test and a jar test in your specific system water before full-scale application.