Correlations

4-ring+ Aromatics

Proportion (%)

• A4 — 4-ring+ Aromatics

• A0 — Aromatics by weight %

• A1 — Aromatics (1-ring) by weight %

• A2 — Aromatics (2-ring) by weight %

• A3 — Aromatics (3-ring) by weight %

• A4 = A0 - A1 - A2 - A3

API gravity

None

• API — API gravity

• SG — Specific gravity at 60°F

• API = 141.5 / SG - 131.5

Aromatics from 1-ring to 4-ring+

Proportion (%)

• A — Aromatics from 1-ring and 2-ring+

• A1 — Aromatics (1-ring) by weight %

• A2 — Aromatics (2-ring) by weight %

• A3 — Aromatics (3-ring) by weight %

• A4PLUS — Aromatics (4-ring+) by weight %

• A = A1 + A2 + A3 + A4PLUS

Aromatics from 1-ring and 2-ring+

Proportion (%)

• A — Aromatics from 1-ring and 2-ring+

• A1 — Aromatics (1-ring) by weight %

• MRA — Multiring aromatics by weight %

• A = A1 + MRA

Butene

Proportion (%)

• BU — Butene

• 1BU — 1-Butene by weight %

• ISOB — iso-butene by weight %

• T2B — trans-2-butene by weight %

• CIS2B — cis-2-butene by weight %

• Bu = 1BU + ISOB + T2B + CIS2B

C/H ratio from PNA

Proportion

• CH — C/H ratio from PNA

• CHP — Carbon to hydrogen ratio for paraffins

• CHN — Carbon to hydrogen ratio for naphthenes

• CHA — Carbon to hydrogen ratio for aromatics

• PAR — Paraffins by weight %

• NAP — Naphthenes by weight %

• ARO — Aromatics by weight %

• CH = (PAR * CHP) + (NAP * CHN) + (ARO * CHA)

C10 paraffins from iso and normal

Proportion (%)

• C10 — C10 paraffins from iso and normal

• ISOC10 — C10 iso-paraffins by weight %

• NC10 — n-decane by weight %

• C10 = ISOC10 + NC10

C11 paraffins from iso and normal

Proportion (%)

• C11 — C11 paraffins from iso and normal

• ISOC11 — C11 iso-paraffins by weight %

• NC11 — n-undecane by weight %

• C11 = ISOC11 + NC11

C12 paraffins from iso and normal

Proportion (%)

• C12 — C12 paraffins from iso and normal

• ISOC12 — C12 iso-paraffins by weight %

• NC12 — n-dodecane by weight %

• C12 = ISOC12 + NC12

C4 paraffins

Proportion (%)

• C4 — C4 paraffins

• IBU — Isobutane by weight %

• NBU — n-butane by weight %

• C4 = IBU + NBU

Carbon/Hydrogen ratio

Proportion

• CH — Carbon/Hydrogen ratio

• C — Carbon by weight %

• H — Hydrogen by weight %

• CH = C / H

Cetane index (ASTM-D976) SI

None

• CI — Cetane index (ASTM-D976) SI

• den — Density at 15°C

• t50 — TBP in °C at yield by volume of 50% measured using D86 and converted to standard barometric pressure.

• CI = 454.74 - 1641.416*den + 774.74*den^2 - 0.554*t50 + 97.803*(log t50)^2

Cetane index (D4737-90)

None

• CI — Cetane index (D4737-90)

• T10 — D86 in °C at yield by volume of 10%

• T50 — D86 in °C at yield by volume of 50%

• T90 — D86 in °C at yield by volume of 90%

• T10N — Intermediate variable

• T50N — Intermediate variable

• T90N — Intermediate variable

• DN — Density number

• B — Intermediate variable

• DEN — Density at 15°C in kg/m³

• DN = DEN - 0.85

• B = exp(-3.5 * DN) - 1

• T10N = T10 - 215

• T50N = T50 - 260

• T90N = T90 - 310

• CI = 45.2 + 0.0892 * T10N + 0.131 * T50N + 0.0523 * T90N + 0.901 * B * T50N - 0.420 * B * T90N + 4.9E-4 * (T10N^2 - T90N^2) + 107 * B + 60 * B^2

Cetane index (IP218)

None

• CI — Cetane index (IP218)

• API — API gravity

• TBP50 — TBP in °F at yield by volume of 50%

• T50 — Intermediate variable

• X — Intermediate variable

• T50 = (TBP / 0.8718)^(1/1.0258)

• X = 97.833 * (log10(T50))^2 + 2.2088 * API * log10(T50) + 0.01247 * API^2 - 423.51 * log10(50) - 4.7808 * API + 419.59

• CI = 0.49083 + 1.06577 * X - 0.0010552 * X^2

Flash point

Temperature (°C)

• FP — Flash point

• MBP — Mean boiling point by volume in °C

• FP = 1.23 * MBP - 97.0

Isoparaffins

Proportion (%)

• ISOPAR — Isoparaffins

• TOTPAR — Paraffins by weight %

• NPAR — n-paraffins by weight %

• ISOPAR = TOTPAR - NPAR

Isoparaffins to n-paraffins

Proportion (%)

• ITON — Isoparaffins to n-paraffins

• ISOPAR — isoparaffins by weight %

• NPAR — n-paraffins by weight %

• ITON = ISOPAR / NPAR

Luminometer Number

Dimensionless

• LN — Luminometer number

• S — Smoke point in mm

• LN = -12.03 + 3.009 * S - 0.0104 * S^2

Meta-xylene + para-xylene

Proportion (%)

• X — meta-xylene + para-xylene

• META — meta-xylene by weight %

• PARA — para-xylene by weight %

• X = META + PARA

Methane + ethane

Proportion (%)

• ME — methane + ethane

• M — methane by weight %

• E — ethane by weight %

• ME = M + E

Molecular Weight

mole

• MW — methane + ethane

• DEN — Density in g/cc at 15°C

• E — Mean boiling point by weight in Rankines

• X1 — Intermediate variable

• X2 — Intermediate variable

• X3 — Intermediate variable

• X4 — Intermediate variable

• X5 — Intermediate variable

• X1 = 4.6523 - 3.3287 * DEN

• X2 = 1 + DEN * (-0.77074 - DEN * 0.02058)

• X3 = 1.3437e7 - 720.97e7 / MBP

• X4 = 1 + DEN * (-0.80882 + DEN * 0.2226)

• X5 = 1.8828e12 - 181.98e12 / MBP

• MW = max(60, -12272.6 + 9486.4 * DEN + X1 * MBP + X2 * X3 / MBP + X4 * X5 / MBP^3)

N+2A

Proportion (%)

• N2A — N+2A

• N — Naphthenes by weight %

• A — Aromatics by weight %

• N2A = N + 2 * A

n-Paraffins

Proportion (%)

• NPAR — n-paraffins

• TOTPAR — Paraffins by weight %

• ISOPAR — iso-paraffins by weight %

• NPAR = TOTPAR - ISOPAR

Olefins

Proportion (%)

• O — Olefins

• C2E — Ethene by weight %

• PRP — Propene by weight %

• NC4E — 1-butene by weight %

• IC4E — iso-butene by weight %

• T2C4E — trans-2-butene by weight %

• C2C4E — cis-2-butene by weight %

• BD12 — 1-2-butadiene by weight %

• C2C4E — 1-3-butadiene by weight %

• O = C2E + PRP + NC4E + IC4E + T2C4E + C2C4E + BD12 + BD13

Paraffins

Proportion (%)

• PAR — Paraffins

• ISOPAR — iso-paraffins by weight %

• NPAR — n-paraffins by weight %

• PAR = ISOPAR + NPAR

Pour point index

Dimensionless

• PPI — Pour point index

• PPT — Pour point in °F

• PPI = exp(0.03 * PPT)

Saturates

Proportion (%)

• S — Saturates

• PAR — Paraffins by weight %

• NAP — Naphthenes by weight %

• S = PAR + NAP

Watson K

Dimensionless

• K — Watson K

• VABP — Volume averaged mean boiling point

• SG — Specific gravity at 60°F

• K = VABP^(1/3)/SG