Dimethylethanolamine (DMEA) and ethanolamine (EA) are both amines, but they have different chemical structures. DMEA has two methyl groups on the nitrogen atom, while EA has only one. This structural difference endows DMEA with distinct properties from EA.

DMEA is a stronger foundation than EA. This means it is more reactive with acids and more likely to form salts. DMEA is also a more effective corrosion inhibitor than EA. This is because it forms a protective layer on metal surfaces that helps prevent corrosion.

EA is a more versatile chemical than DMEA. It is used in a wider range of applications including the production of resins, pharmaceuticals and cosmetics. EA is also used as an antifoaming agent and pH buffering agent.

DMEA is a more expensive chemical than EA. This is because it is more difficult to produce. DMEA is also a more hazardous chemical than EA. It is flammable and irritating to skin and eyes. It is also a potential carcinogen.

To sum up, DMEA and EA are both amines, but their chemical structures and properties are different. DMEA is a stronger base and more effective corrosion inhibitor than EA. EA is a more versatile chemical with a wider range of applications. DMEA is a more expensive and dangerous chemical than EA.