Naphtha: from 0.117 % sulphur to 55 ppm, and a passed doctor test
A naphtha parcel in a third-party shore tank failed on total sulphur and on the doctor test for mercaptans. Treatment ran at tank scale; the independent report on the treated parcel read 55 ppm.
What was done
Doctor-test treatment for mercaptan sulphur, then desulphurisation by chemical reaction, both dosed at the terminal. Before and after samples were tested by an independent ISO 9001 laboratory in Hamriyah against the full distillation and sulphur suite. Reports, with their reference numbers, are available on request.
The report, row by row
| Test | Method | Before | After |
|---|---|---|---|
| Total sulphur | ASTM D4294 | 1,170 ppm wt | 55 ppm wt |
| Mercaptan sulphur | ASTM D3227 | 0.080 % wt | doctor test negative % wt |
| Colour | ASTM D156 | +22 Saybolt | on specification Saybolt |
| Distillation | ASTM D86 | full curve reported °C | full curve reported °C |
Independent ISO 9001 laboratory, Hamriyah Free Zone. Two reports, before and after, available on request. Red marks the value before treatment; green, after; plain figures held within the method's repeatability.
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