Light oil compositions
The invention provides a gas oil composition having a C10-24 paraffin composition that satisfies the condition represented by inequality (1-1) below, a slow-cooling cloud point of no higher than −6.0° C. and a pour point of no higher than −7.5° C. The invention further provides a gas oil composition having a C10-24 paraffin composition that satisfies the condition represented by inequality (1-2) below, a distillate volume at a distillation temperature of 250° C. (E250) of 5-45% and a slow-cooling cloud point of higher than −6.0° C. In inequalities (1-1) and (1-2), n is the carbon number of the paraffin and f(n) is the paraffin composition parameter for the carbon number of n represented by formula (2) below. In formula (2), n represents an integer of 10-24, and a, b and c respectively represent the proportion (in terms of molar value) of normal paraffins with carbon number of n, of isoparaffins with carbon number of n and one branch and of isoparaffins with carbon number of n and two or more branches, with respect to the total amount of paraffins with carbon number of n. [ Mathematical Formula 1 ] 340.0 ≤ ∑ n = 10 24 f ( n ) ≤ 400.0 ( 1 - 1 ) [ Mathematical Formula 2 ] f ( n ) = 27.45 - 3.55 ( b / a ) - 0.65 ( c / a ) ( 2 ) [ Mathematical Formula 3 ] 370.0 ≤ ∑ n = 10 24 f ( n ) ≤ 430.0 ( 1 - 2 )
1. A gas oil composition comprising:
a C10-24 paraffin composition that satisfies the condition represented by the following inequality (1-1),
a slow-cooling cloud point of no higher than −6.0° C. and
a pour point of no higher than −7.5° C.,
[
Mathematical
Formula
1
]
340.0
≤
∑
n
=
10
24
f
(
n
)
≤
400.0
(
1
-
1
)
wherein n represents the carbon number of the paraffin, and f(n) represents the paraffin composition parameter for the carbon number of n represented by the following formula (2):
[Mathematical Formula 2]
f ( n )=27.45−3.55( b/a )−0.65( c/a ) (2)
wherein n represents an integer of 10-24 and a, b and c respectively represent the proportion of normal paraffins with carbon number of n in terms of molar value, of isoparaffins with carbon number of n and one branch and of isoparaffins with carbon number of n and two or more branches, with respect to the total amount of paraffins with carbon number of n,
wherein the 10% distillation temperature of the gas oil composition is from 165° C. to 205° C., the 50% distillation temperature of the as oil composition is from 200° C. to 255° C., and the 90% distillation temperature of the gas oil composition is from 265° C. to 330° C.
2. A gas oil composition according to claim 1 , wherein the cetane number is at least 65, the sulfur content is no greater than 10 ppm by mass, the aromatic content is no greater than 1% by mass, the naphthene content is no greater than 5% by mass and the cold filter plugging point is no higher than −5° C., and
wherein the C10-24 paraffin composition that satisfies the condition represented by the following inequality (1-3),
[
Mathematical
Formula
5
]
375.0
≤
∑
n
=
10
24
f
(
n
)
≤
400.0
.
(
1
-
3
)
3. A gas oil composition comprising:
a C10-24 paraffin composition that satisfies the condition represented by the following inequality (1-2),
a distillate volume at a distillation temperature of 250° C. , represented by E250, of 5-45% and
a slow-cooling cloud point of higher than −6.0° C.,
[
Mathematical
Formula
3
]
370.0
≤
∑
n
=
10
24
f
(
n
)
≤
430.0
(
1
-
2
)
wherein n represents the carbon number of the paraffin, and f(n) represents the paraffin composition parameter for the carbon number of n represented by the following formula (2):
[Mathematical Formula 4]
f ( n )=27.45−3.55( b/a )−0.65( c/a ) (2)
wherein n represents an integer of 10-24 and a, b and c respectively represent the proportion of normal paraffins with carbon number of n in terms of molar value, of isoparaffins with carbon number of n and one branch and of isoparaffins with carbon number of n and two or more branches, with respect to the total amount of paraffins with carbon number of n,
wherein the 10% distillation temperature of the gas oil composition is from 175° C. to 270° C., the 50% distillation temperature of the gas oil composition is from 230° C. to 300° C., and the 90% distillation temperature of the gas oil composition is from 285° C. to 330° C.
4. A gas oil composition according to claim 3 , wherein the cetane number is at least 65, the sulfur content is no greater than 10 ppm by mass, the aromatic content is no greater than 1% by mass, the naphthene content is no greater than 5% by mass and the cold filter plugging point is no higher than −5° C.