How Fatty Alcohols Become C12–14 Alkyldimethylamine

Where does the long carbon chain in C12–14 alkyldimethylamine come from? In one published manufacturing route, it comes from the fatty alcohol. Dimethylamine supplies the nitrogen and its two methyl groups. A published patent describes this route using a blend of dodecanol and tetradecanol. patents.google.com

What each feedstock contributes

Dodecanol contributes a 12-carbon chain, and tetradecanol contributes a 14-carbon chain. The C12–14 designation refers to that long alkyl chain. The two methyl groups attached to nitrogen contribute two additional carbons to each molecule. The resulting nitrogen is bonded to three carbon groups, which makes the product a tertiary amine. patents.google.com

Where the water comes from

The overall reaction can be written as:

R–OH + HN(CH₃)₂ → R–N(CH₃)₂ + H₂O

Here, R represents the long alkyl chain. The alcohol supplies the hydroxyl group and dimethylamine supplies the hydrogen on nitrogen. The net reaction forms one molecule of water for each molecule of tertiary amine formed. In the published process example, the plant removes the reaction water as an aqueous phase. patents.google.com

What this means for buyers

If your plant uses C12–14 alkyldimethylamine to make an amine oxide, you’re buying the tertiary amine intermediate. Oxidation is a separate downstream step. For incoming inspection, the chain distribution describes the alkyl profile of the delivered grade, while a free-alcohol result, when specified, tells you how much unreacted alcohol the test found. Request the agreed test basis and batch results when either parameter matters to your process. patents.google.com

When requesting a quote from China Amines Co., Limited, include your target C12/C14 range, any free-alcohol limit, and expected order volume. Ask for the current grade specification and a representative certificate of analysis for your review.

Technical references

• US4442306A — Production of tertiary amines
• CN102976950A — Improved process for preparing tertiary amine
• US9085515B2 — Continuous process to make amine oxide