1. Introduction
Physical data:
CAS Number: 67-43-6, Molecular Formula: C14H23N3O10, MW: 393.34700
Exact mass: 393.13800, PSA：196.22000, Physicochemical properties, Appearance and properties: solid
Density: 1.56, Melting Point: 219-220°C(lit.), Boiling Point: 721.1ºC at 760 mmHg
Flash Point: 200 °C, Water solubility: 5 g/L (20 ºC), Assay: 99%, Fe: 0.001%max, pH:2.1-2.5 (10g/L at 25 dc)
DTPA pentetic acid is a high-purity multi-site chelating agent with a structure consisting of three nitrogen atoms and five carboxyl groups. It can stably complex with a variety of metal ions and is widely used in water treatment, paper bleaching, electroplating, pharmaceutical intermediates and other industries.
2. Features
High-purity Compound
DTPA Pentetic Acid has a purity of up to 99%, and its extremely low impurity content ensures stable performance in high-demand scenarios.
Multi-site Chelation
Its molecular structure contains 5 carboxyl groups and 3 nitrogen atoms, forming an octa-coordinated structure, which can efficiently bind various metal ions such as iron, lead, and copper, and can stably remove more than 99% of heavy metals in water treatment.
Moderate Solubility
The solubility in 25°C water is 5g/L, which is convenient for preparing chelating agent solutions of different concentrations on demand to meet the concentration control requirements of multiple scenarios such as chemical reactions and bleaching processes.
| Field | Detail |
|---|---|
| Paper industry | Recycled pulp bleaching stabilizer, used with sodium silicate, can maintain the whiteness of the paper and inhibit yellowing. Textile printing and dyeing dye color protector, eliminate metal ion interference, improve color fastness by 0.5 grade, whiteness increase by 3% ISO47. |
| Textile printing and dyeing | dye color protector, eliminate metal ion interference, improve color fastness by 0.5 grade, whiteness increase by 3% ISO. |
| Electroplating industry | Electroplating solution complexing agent, precise control of metal ion concentration, optimize coating uniformity and corrosion resistance |
| Industrial cleaning | Removes scale (such as calcium and magnesium deposits) from equipment, and the RO membrane flux recovery rate can reach 95%. |
| Daily chemical and pharmaceutical | cosmetics as a metal chelating agent, used in the pharmaceutical field to prepare intermediates or radioactive element accelerators.. |
3. Pakcage
25kg/bag or OEM
4. Application recommendation:
Papermaking Industry
In the papermaking industry, DTPA is mainly used in the pulp bleaching process. DTPA is added at a bleaching agent dosage of 0.5%-1%, and then compounded with sodium silicate and added to the pulp, and reacted at 60-80℃ for 30 minutes. It can complex with metal ions in the pulp, reduce the catalytic decomposition of hydrogen peroxide, improve the bleaching efficiency, and prevent the fiber from being degraded by metal ions, maintaining the strength and whiteness of the paper.
Textile Printing And Dyeing Industry
In textile printing and dyeing, DTPA is used to optimize the dyeing effect. Prepare a 0.1%-0.3% DTPA solution and add it to the dye bath, and control the pH value to 8-10 to improve the complexing efficiency. It can chelate metal ions in the dye bath to prevent them from interfering with the combination of dyes and fibers, making the dyeing more uniform, improving color fastness, and making the fabric color lasting and bright.
Electroplating Solution Preparation Field
DTPA is used as a key additive when preparing electroplating solution. The concentration of DTPA in the plating solution is controlled at 5-10 g/L and compounded with triethanolamine, and the temperature is maintained at 40-50°C. It can form a stable complex with metal ions, promote uniform deposition of metal ions, improve the uniformity and quality of the coating, and reduce the impact of impurities on the coating.
Industrial Cleaning Field
In industrial cleaning, DTPA is used to remove equipment dirt. Using 3%-5% DTPA solution to clean equipment, combined with acidity regulators such as citric acid, can enhance the descaling effect. DTPA has a complexing effect on scale-forming ions such as calcium, magnesium, and iron, and can effectively dissolve and remove stubborn dirt on the surface of the equipment and restore equipment performance.
Q&A
The main differences between DTPA and EDTA:
1. Chemical Structure Differences
DTPA (diethylenetriaminepentaacetic acid): molecular formula C14H23N3O10, with one more carboxyl group (-COOH) and one amino group (-NH2) than EDTA.
EDTA (ethylenediaminetetraacetic acid): molecular formula C10H16N2O8, containing four carboxyl groups and two amino groups.
2. Chelating Ability And Stability
Metal affinity
DTPA has a strong chelating ability for high-valent metal ions (such as Fe³⁺, Cu²⁺, Mn²⁺), and can effectively inhibit oxidation reactions, especially in alkaline environments.
EDTA has a better chelating effect on divalent metal ions (such as Ca²⁺, Mg²⁺), but its chelating stability for high-valent metals is poor.
Antioxidant properties
DTPA chelates have significantly higher oxidation stability than EDTA, and are more suitable for scenarios that require long-term inhibition of metal catalytic oxidation (such as bleaching processes).
3. Physical Properties And Solubility
DTPA: It is a white crystalline powder, slightly soluble in cold water, soluble in hot water and alkaline solutions. To improve water solubility, it is often used in the form of pentasodium salt.
EDTA: It is a white powder with poor water solubility. It is usually used in the form of disodium salt (e.g. EDTA-2Na).
4. Side Effects And Limitations
DTPA: It has a strong chelating ability for essential trace elements (zinc, copper, etc.) for the human body. Long-term use may cause an imbalance of trace elements in the human body.
EDTA: It is relatively cheap, but it is easy to decompose and become ineffective under high temperature or strong acid environment, and its stability to high-valent metal ions is also poor.
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