DOE Big Hill Sweet complete modeled assay slate

DoeBigHillSweetAssay assembles the refinery campaign’s qualified public inputs into one reusable Java/JPype assay definition. The factory configures an OilAssayCharacterisation on a caller-selected mass basis and deliberately requires a separate apply() call before the thermodynamic system is mutated.

Primary public sources

The comprehensive workbook reports the following non-overlapping mass-basis cuts. The mass yields close to exactly 100.00% at the displayed precision.

Cut Mass % SG60/60 Sulfur mass % Nitrogen mass % Characterization
C2-C4 gas 1.70 — 0 assumed 0 assumed DOE PIANO C2-C4 subset normalized over the whole gas slice
C5-175 degF 5.22 0.6731 0.0008 0 assumed PIANO-derived 0.0791538366563 kg/mol; upper boundary only
175-250 degF 8.32 0.7432 0.0026 0 assumed finite DOE cut boundaries
250-375 degF 12.55 0.7817 0.019 0 assumed finite DOE cut boundaries
375-530 degF 16.19 0.8297 0.096 0.0018 finite DOE cut boundaries
530-650 degF 13.18 0.8604 0.313 0.0186 finite DOE cut boundaries
650-850 degF 18.44 0.9039 0.534 0.102 finite DOE cut boundaries
850-1050 degF 12.84 0.9336 0.752 0.234 finite DOE cut boundaries
1050 degF+ 11.56 1.0089 1.334 0.501 lower boundary only; DOE Watson factor 11.7

DOE leaves sulfur blank for the gas cut and nitrogen blank through the 250-375 degF cut. The zeros above are the same explicit screening assumptions used by the independently qualified sulfur and nitrogen bookkeeping tests; they are not reported measurements.

Light-end allocation assumption

The PIANO debutanization table reports ethane 0.09, propane 10.38, i-butane 10.21, and n-butane 45.95 wt%, totaling the reported 66.63 wt% C2-C4 subset. The reference factory normalizes those four weights and allocates the full 1.70 mass% gas cut between them. This preserves the published gas-cut mass while supplying real NeqSim standard components, but it is not a measured complete gas analysis.

Usage

SystemInterface crude = new SystemSrkEos(298.15, 1.01325);
OilAssayCharacterisation assay = DoeBigHillSweetAssay.create(crude, 1.0); // kg

// Inspect mass fractions, sulfur/nitrogen, and boundaries before mutation.
double sulfurMassPercent = assay.getBulkSulfurMassPercent();
assay.apply();

The one-kilogram regression requires 12 positive components (four standard light molecules and eight petroleum pseudo-components), reconstructed component mass closure within 1e-10 kg, sulfur 0.40867518 mass%, and nitrogen 0.1095129 mass%. A second construction must produce the identical resolved mass vector.

Evidence and validity boundary

This class is a source-specific reproducible reference composition. It does not mix the older 1998 five-cut table with the 2021 nine-cut workbook. It also does not validate the normalized gas allocation, generated critical properties, acentric factors, vapor-liquid equilibrium, atmospheric product yields, or conversion-unit performance. DOE publishes the workbook for information purposes with no warranty of accuracy or completeness; users remain responsible for its application.

The next validation gate is to run this complete slate through the atmospheric-column workflow and compare product yields and boiling ranges against independent public evidence before advancing to vacuum fractionation.