DIPA Diisopropanolamine: Properties & 6 Industrial Applications Guide

1. What Is DIPA (Diisopropanolamine)?

Diisopropanolamine (commonly abbreviated as DIPA) is a secondary alkanolamine with the chemical formula C₆H₁₅NO₂. Its structure features a central secondary amine (–NH–) bonded to two isopropanol groups, each carrying a secondary hydroxyl (–OH) group. This dual-functionality — combining amine basicity with alcohol reactivity — makes DIPA a remarkably versatile chemical intermediate.

At room temperature, pure DIPA appears as a white to pale yellow hygroscopic crystalline solid with a mild ammonia-like odor. It is highly soluble in water (870 g/L at 20 °C) and miscible with alcohols and many polar solvents. Commercial grades typically achieve ≥99.0% purity. Low-freeze grade (LFG) formulations at 85% and 90% concentration are also available for easier handling in cold climates.

2. Molecular Structure & Key Properties

The secondary amine group provides weak alkalinity (pKa ≈ 9.1), allowing DIPA to neutralize acids and buffer pH. The two hydroxyl groups contribute to its excellent water solubility and enable reactions typical of secondary alcohols. This combination of properties explains DIPA's broad utility across multiple industrial sectors.

3. Six Major Industrial Applications

3.1 Gas Treating: Acid Gas Removal

One of DIPA's most significant industrial applications is in gas treating — specifically, the removal of acidic gases such as carbon dioxide (CO₂) and hydrogen sulfide (H₂S) from natural gas, refinery gas, and synthesis gas streams.

• Mechanism: The amine group in DIPA reacts reversibly with CO₂ and H₂S to form salts. The loaded solution is then regenerated by heating, releasing the captured acid gases and allowing the DIPA solution to be recycled.
• Selective H₂S removal: Under certain operating conditions, DIPA can selectively remove H₂S while leaving CO₂ partially untreated — useful when only sour gas removal is required.
• Advantages: High absorption capacity, good thermal stability, low vapor pressure (minimal solvent losses), and cost-effective regeneration make DIPA a preferred choice for medium-pressure gas sweetening applications.

3.2 Metalworking Fluids

DIPA is a key ingredient in water-based metalworking fluid formulations, serving multiple functions simultaneously:

• Corrosion inhibitor: Forms protective films on metal surfaces, preventing rust and oxidation during machining, storage, and transport.
• pH stabilizer: Maintains alkaline pH in fluid systems, extending the service life of cutting and cooling fluids by inhibiting bacterial growth.
• Lubricity enhancer: When converted to tall oil amides, DIPA improves lubrication during buffing, cutting, and cleaning operations while suppressing foam.
• Emulsifier: Helps maintain stable oil-in-water emulsions critical for effective metal removal and surface finish.

3.3 Surfactants & Cleaning Products

DIPA's ability to neutralize fatty acids and sulfonic acids makes it an important raw material in surfactant and detergent production:

• Soap formation: Neutralizes fatty acids to produce mild, water-soluble soaps used in personal care products such as shampoos, liquid soaps, and skin lotions.
• Amphoteric surfactants: Key raw material for producing betaine-type surfactants (e.g., cocamidopropyl betaine), widely used for their mildness and skin compatibility.
• Institutional cleaners: Used in floor cleaners, bathroom cleaners, kitchen degreasers, and vehicle cleaning products — providing degreasing power, pH control, and low-residue performance.
• Emulsification: Acts as an oil and fat solubilizer, improving formulation stability and cleaning efficiency.

3.4 Coatings & Paints

In the coatings industry, DIPA serves as a multifunctional additive:

• Resin neutralizer: Neutralizes acidic components in water-borne coating resins, enabling stable dispersion and film formation.
• Pigment dispersant: Improves dispersion of pigments and fillers, enhancing color uniformity and coating quality.
• Electrodeposition (electrocoating) neutralizer: Used in cathodic electrocoating systems to stabilize the coating bath and improve deposit quality.
• Cross-linking aid: In specialty water-based coatings, DIPA participates in the polymerization process, improving film strength and water resistance.

3.5 Textile Processing

In textile manufacturing and finishing, DIPA contributes to several processing steps:

• Wetting agent: Improves fiber wetting during dyeing and finishing operations, ensuring uniform chemical penetration.
• Anti-static agent: Provides anti-static properties to synthetic fibers and carpets, reducing dust attraction and improving handling.
• Refining agent: Assists in scouring and refining processes by emulsifying natural oils and impurities from raw fibers.
• Heat resistance improvement: Enhances thermal stability of treated textiles and improves durable press characteristics.

3.6 Cement Grinding Aid

DIPA is increasingly used as a high-efficiency cement grinding aid:

• Grinding efficiency: Reduces agglomeration of cement particles during grinding, improving mill throughput and reducing energy consumption.
• Particle flow improvement: Enhances the flow properties of cement powders, improving handling and packaging efficiency.
• Strength enhancement: Can positively influence the early and later compressive strength of cement, contributing to product quality.

4. Isopropanolamine Family: MIPA / DIPA / TIPA / DEIPA / EDIPA Comparison

The isopropanolamine family comprises five major products derived from the reaction of ammonia (or ethanolamines) with propylene oxide. Each member carries a distinct number of hydroxyl and isopropyl groups, leading to different physical properties and application profiles.

How to Choose the Right Isopropanolamine

• MIPA — lowest molecular weight, liquid at ambient temperature; ideal where fast dissolution and primary amine reactivity are needed (surfactants, coatings, personal care).
• DIPA — secondary amine with balanced hydroxyl functionality; the go-to choice for gas treating, metalworking fluids, and surfactants requiring low nitrosamine risk.
• TIPA — tertiary amine with three isopropyl groups; excels as a cement grinding aid, particularly for late-age strength enhancement through Fe³⁺ complexation.
• DEIPA — hybrid structure combining ethanol and isopropanol groups; delivers superior all-age cement strength improvement and better grinding efficiency than TEA.
• EDIPA — the newest member; early strength slightly lower than DEIPA but late strength (28-day) outperforms DEIPA; excellent activator for fly ash, slag, and limestone blends.

5. Packaging, Storage & Transportation

Packaging

DIPA is typically packaged in 200 kg steel drums. For larger quantities, IBC totes, ISO tanks, and bulk tank truck delivery are also available. Low-freeze grade (LFG) versions at 85% and 90% DIPA concentration (blended with deionized water) are offered for easier handling in cold-weather environments.

Storage Requirements

• Store in tightly sealed containers in a cool, dry, and well-ventilated warehouse.
• Separate from strong acids and strong oxidizing agents.
• Protect from direct sunlight and moisture.
• Note: Pure DIPA solidifies at ~42 °C. In cold climates, use LFG grades or provide heated storage/handling systems.
• DIPA may turn yellow upon prolonged exposure to air and light — this does not significantly affect performance in most industrial applications.
• Shelf life: 24 months under proper storage conditions.

Transportation

DIPA is classified as a combustible substance with a high flash point (127–135 °C). It is not classified as a dangerous good for transport purposes. Handle according to general chemical transportation regulations.

6. Safety & Handling

DIPA has low acute systemic toxicity but is corrosive to eyes and can cause skin irritation with prolonged contact. Standard precautions include:

• Wear chemical-resistant gloves and safety goggles during handling.
• Use in well-ventilated areas; avoid inhalation of mist or aerosol.
• If contact with eyes occurs, rinse immediately with plenty of water for at least 15 minutes and seek medical attention.
• If skin contact occurs, wash thoroughly with soap and water.
• Combustible material — fire can be extinguished with foam, dry powder, or water spray.
• Do not use in formulations containing N-nitrosating agents (risk of nitrosamine formation).

7. About Shenyang Xingzhenghe Chemical

• Product:
• DIPA (Diisopropanolamine)
• CAS No.:
• 110-97-4
• Supplier:
• Shenyang Xingzhenghe Chemical Co., Ltd.
• Tags:
• DIPA, diisopropanolamine, CAS 110-97-4, gas treating amine, metalworking fluid additive, surfactant neutralizer, alkanolamine, coating neutralizer, cement grinding aid