Applications of Diethanolamine in Industrial Manufacturing

As a core chemical intermediate, diethanolamine participates in a range of manufacturing workflows across established industrial sectors. Below, we outline real downstream application scenarios where our direct production supports large-scale demand, technical compliance, and end-use consistency.

1. Surfactant Production for Detergents and Cleaners

Surfactant formulators use diethanolamine to react with fatty acids, generating fatty acid alkanolamides for liquid detergents, shampoo, and all-purpose cleaners. Its dual amine and alcohol functionalities enable precise molecular modification, which impacts finished surfactant foamability, viscosity, and cleansing performance. Manufacturers select specific grades and purities to match major home care or institutional cleaning regulations, and batch QC controls assure product uniformity across global supply chains.

Industry compliance standards

• REACH (EC 1907/2006)
• US EPA TSCA Inventory
• EU Detergent Regulation (EC 648/2004)
• SABS 1828/1829 (South Africa)
• China GB/T 26396 Surfactant Raw Materials Standard

Typical usage ratio

• 10–35% by weight in surfactant intermediate synthesis
• Adjustment bases: target foam level and detergent concentration

Downstream process integration

• Direct addition to fatty acid amidation step at controlled pH
• Continuous or batch reactors with online viscosity measurement
• QC sampling at neutralization and blending
• Feeds directly into high-shear mixing for liquid detergent compounding

Final product types

• Liquid laundry detergents
• Household dishwashing liquids
• Carpet and upholstery cleaners
• Personal care shampoos and bath gels

2. Gas Treatment for Industrial Refining and Oil & Gas Processing

Refineries and gas processing facilities use diethanolamine as a selective solvent in amine gas treating units, especially for removing acidic gases such as hydrogen sulfide (H₂S) and carbon dioxide (CO₂) from natural gas and refinery process streams. Operations demand precise amine strength adjustments, fluid compatibility, and rigorous monitoring to safeguard worker safety and ensure compliant emissions. Process optimization directly depends on amine degradation rates and reclaiming cycles.

Industry compliance standards

• API Recommended Practice 521
• OSHA Process Safety Management (29 CFR 1910.119)
• US EPA 40 CFR Part 60 (NSPS Processing Plants)
• EN 746-2 Industrial Thermoprocessing Equipment
• SHELL DEP 80.45.10.11-Gen (Gas Treating Units)

Typical usage ratio

• 20–30 wt% aqueous amine solution for gas sweetening
• Ratios vary according to acid gas loading and contactor operating pressure

Downstream process integration

• Feeds to primary amine circulation system via reclaim tank
• Mixed and pre-filtered before absorber column introduction
• Monitored for amine degradation byproducts in real time
• Returned to amine flash tank or stripper for regeneration

Final product types

• Pipeline-quality sweet natural gas
• Refinery syngas for ammonia and methanol units
• Desulfurized fuel gases and LPG blends
• Regenerated acid gas streams for sulfur recovery

3. Herbicide and Agrochemical Formulation

In the agrochemical sector, diethanolamine acts as a neutralizing agent in the preparation of aqueous salt forms of glyphosate and other carboxylic acid-based herbicides. The reaction produces stable, water-soluble salts for direct blending into finished crop protection products. Regulatory controls mandate documentation from formulation through packaging, with batch traceability and validation of final herbicidal potency.

Industry compliance standards

• FAO/WHO Specifications for Pesticide Products
• US EPA FIFRA Registration
• Chinese NY/T 1979-2010 (Herbicide Technical Material Standard)
• EU Plant Protection Products Regulation (EC 1107/2009)
• ISO 9001:2015 for agrochemical production

Typical usage ratio

• 20–28% by mass in glyphosate salt synthesis reactions
• Dosage adjusted for stoichiometric equivalence to herbicidal acid content

Downstream process integration

• Introduced post pH-adjustment following acid dissolution
• Reaction under cool, stirred conditions (35–40°C)
• In-process titration and salt content verification
• Feeds final dilution and packaging line for bulk herbicide solutions

Final product types

• Glyphosate diethanolamine salt solution concentrates
• Selective weed control agents for crops
• Ready-to-use lawn and garden herbicides
• Aquatic and industrial weed management products

4. Personal Care and Cosmetic Ingredient Synthesis

Personal care manufacturers utilize diethanolamine in the synthesis of gentle foam boosters and emulsifying agents. Its reaction with lauric or stearic acid produces nonionic alkanolamides that provide improved texture and skin feel for shampoos and lotions. Formulation requires strict control over residual amine levels and is governed by multiple regional and ISO certifications related to user safety and allergenic risk. Batch QA releases require traceability and final product allergen statements.

Industry compliance standards

• EU Regulation (EC) No 1223/2009 (Cosmetics Regulation)
• US FDA 21 CFR Parts 700-740 (Cosmetics GMP)
• China GB 7916 Cosmetic Safety Technical Specification
• ISO 22716:2007 (Cosmetics – GMP)

Typical usage ratio

• 5–15% by weight as alkanolamide precursor
• Lower concentrations for facial cleansers; higher for hair care

Downstream process integration

• Charged directly into heated fatty acid blending reactors
• Batch-cooked or continuous amidation at 80–120°C
• Quality checks for color, odour, residual amine below 30 ppm
• Milled and filtered before addition to cosmetic bases

Final product types

• Mild foaming body washes
• Hair conditioners and 2-in-1 shampoos
• Moisturizing creams and emulsions
• Facial cleansing milks

5. Corrosion Inhibitors for Metalworking Fluids

In metal finishing and machining, diethanolamine serves as a neutralizer and corrosion inhibitor component in water-based fluid formulations. The compound complexes with weak acids and forms protective surface films on steel, copper, and alloys. Blending precision influences the resulting pH buffer capacity and anti-stain properties. Plants must monitor amine vapor emissions, assure blend clarity, and comply with end-user clean-lubricant performance standards.

Industry compliance standards

• ASTM D4627: Evaluation of Corrosion Inhibitors
• REACH Annex XVII (Restriction of secondary amines)
• US OSHA 29 CFR 1910.1200 (Hazard Communication)
• JIS K 2246 (Metalworking Fluid Specifications)

Typical usage ratio

• 1–5% by weight in finished metalworking fluids
• Ranges tighten per fluid type (cutting, grinding, forming)

Downstream process integration

• Inserted during emulsifier and base oil premix blending
• Inline pH adjustment and buffering checks
• Filtered before drum filling or bulk tank dispatch
• Followed by accelerated corrosion laboratory screening

Final product types

• Coolant lubricants for CNC machinery
• Anti-rust fluid sprays and concentrates
• Water-dilutable metal forming fluids
• Temporary corrosion preventive oils