MDEA Content vs. Total Amine: What Does the Report Measure?

A solvent report lists “total amine”, while the purchase specification requires MDEA weight percent. Before comparing the result with the limit, ask what the laboratory measured and how it calculated the reported value. A clear reporting basis helps purchasing and operations interpret the same figure consistently.

Identify the component being reported

For N-methyldiethanolamine (MDEA, CAS 105-59-9), confirm whether the result describes MDEA specifically or a broader amine measurement.

A published MDEA technical data sheet specifies a gas chromatographic method for assay. When reviewing another report, request the method reference and confirm which components are included in the result. amines.com

Ask how “total amine” is calculated

Request the laboratory’s definition of the term. Confirm whether it reports the sum of individually measured amines, a titration-derived value expressed as a named amine equivalent, or another defined quantity.

Record the units and calculation basis. If a titration result is expressed as MDEA equivalents, ask the laboratory how other basic components in the sample affect that result.

Review formulated solvents component by component

In a hypothetical mixture containing 40 wt% MDEA and 5 wt% another amine, the sum of those two mass fractions is 45 wt%. That arithmetic describes the combined amine mass fraction when both component values have been established on that basis.

For a proprietary or activated solvent, use the approved formulation requirements and ask which component results the supplier can report. Keep MDEA concentration and any promoter requirements clearly identified.

Align the report with the purchase requirement

Write the required parameter explicitly in the RFQ, such as “MDEA content, wt% in the supplied product”, together with the agreed method and acceptance range. If the plant also requires total amine data, define that measurement separately.

Send China Amines Co., Limited your required grade, analytical requirements, net quantity, packaging and destination port so we can review the proposed documentation with the quotation.

Inquiries
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Technical references

• Amines & Plasticizers Limited — Methyl Diethanolamine Technical Data Sheet
• IUPAC Gold Book — Mass Fraction