How to Read the C12/C14 Ratio in Alkyldimethylamine

China Amines Co., Limited

A development report says “C12/C14 = 50:50.” The purchasing team copies it into the specification. Then quality asks a question that should have come up one meeting earlier: 50:50 by mass or by moles?

C12–14 alkyldimethylamine is a fatty tertiary amine intermediate. The C12 and C14 components differ in alkyl chain length and molecular weight. Eastman’s DIMLA™ 1214 technical data sheet lists molecular weights of 213.41 g/mol for the C12 component and 241.46 g/mol for the C14 component. At equal mass, the lighter C12 component contributes more moles.

One blend, two ways to report it

Consider a hypothetical blend containing only 50 g of the C12 component and 50 g of the C14 component. Divide each mass by its molecular weight to calculate how many moles it contributes.

Both percentages describe the same blend. The example illustrates the calculation using a simplified two-component mixture. For a commercial grade, use the composition and reporting basis provided for that material.

Carry the reporting basis into the purchase specification

If an amine oxide or betaine production team wants to match the chain distribution of a successful trial, it should carry over the original units and analytical method. Ask whether the reported percentages refer to the whole sample or whether the C12 and C14 values were recalculated to add up to 100%. That detail matters when a report also lists other components.

When requesting C12–14 alkyldimethylamine from China Amines, include the target chain distribution, the reporting basis and any method required by your quality team. If you are matching an existing grade, sharing the relevant specification line with its units gives us a clearer basis for reviewing the offered material.

Technical reference
Eastman — DIMLA™ 1214 Technical Data Sheet