FMI suggests the Diethanolamine market was valued at USD 19.4 billion in 2025, increased to USD 20.3 billion in 2026, and is projected to reach USD 32.5 billion by 2036, reflecting a 4.8% CAGR during 2026 to 2036. By segment, Chemical Intermediate applications lead the Application category with a 35% share in 2026, while the Oil & Gas industry dominates the End Use segment with a 29% share in 2026.