US2021079306A1PendingUtilityA1
Predicting Solvent Power of Light
Est. expirySep 1, 2035(~9.1 yrs left)· nominal 20-yr term from priority
G01N 33/2823C10G 75/00C10G 2300/802C10G 2300/206G01N 31/16
57
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Claims
Abstract
The recalculated solvent power may be used in methods for preventing asphaltene precipitation during processing of crude oils in a refinery.
Claims
exact text as granted — not AI-modified1 . A method for recalculating the solvent power of a light oil, SP (LO recalculated) , said method comprising:
titrating the light oil against a reference oil, optionally in the presence of a titrant, to determine a volume fraction of the light oil at the onset of asphaltene precipitation, V (onset fraction LO) , a volume fraction of the reference oil at the onset of asphaltene precipitation, V (onset fraction RO) , and, where a titrant is present, a volume fraction of the titrant at the onset of asphaltene precipitation, V (onset fraction T) , and determining the recalculated solvent power of the light oil, SP (LO recalculated) , according to the following formula:
SP
(
LO
recalculated
)
=
(
CSP
(
RO
)
-
SP
(
RO
)
*
V
(
onset
fraction
RO
)
-
x
*
SP
(
T
)
*
V
(
onset
fraction
T
)
)
V
(
onset
fraction
LO
)
wherein: CSP (RO) is the critical solvent power of the reference oil,
SP (RO) is the solvent power of the reference oil,
SP (T) is the solvent power of the titrant, and
x is 1 where a titrant is present, and otherwise is 0.
2 . The method of claim 1 , wherein titration intervals of less than 15% by weight are used for titrating the light oil against the reference oil.
3 . The method of claim 1 , wherein the light oil is titrated against the reference oil in the presence of a titrant and x is 1.
4 . The method of claim 1 , wherein the method comprises titrating the light oil against a plurality of reference oils, predicting a solvent power of the light oil for each of the plurality of reference oils and determining an average predicted solvent power of the light oil.
5 . The method of claim 4 , wherein the light oil is titrated against at least 5 reference oils.
6 . The method of claim 1 , wherein the solvent power of the reference oil, SP (RO) , is estimated from the characterisation K factor of the reference oil.
7 . The method of claim 1 , wherein the critical solvent power of the reference oil, CSP (RO) , is determined by titrating the reference oil against a precipitant.
8 . The method of claim 1 , wherein the light oil has an asphaltene content of less than 1% by weight.
9 . The method of claim 1 , wherein the reference oil has an asphaltene content of greater than 3% by weight.
10 . The method of claim 1 , wherein the light oil and the reference oil are crude oils.
11 . A method for determining a relationship between the recalculated solvent power and the bulk properties of lights oils, said method comprising:
determining the recalculated solvent power for a plurality of light oils using a method in accordance with claim 1 ; and determining a relationship between the recalculated solvent power and the bulk properties of the plurality of light oils.
12 . The method of claim 11 , wherein the method comprises measuring the bulk properties of the plurality of light oils.
13 . The method of claim 11 , wherein the plurality of light oils consists of at least 5 light oils.
14 . The method of claim 11 , wherein the bulk properties include at least one of: yield; characterisation K factor; total acid number (TAN); nitrogen content; and API gravity; aromatics content; and density.
15 . A method for predicting the recalculated solvent power of a light oil, said method comprising using the relationship determined in claim 11 to predict the recalculated solvent power of a light oil from its bulk properties.
16 . The method of claim 15 , wherein the method comprises measuring the bulk properties of the light oil.Cited by (0)
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