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INVENTION
Patent of the Russian Federation RU2078792
A METHOD FOR OBTAINING HIGH-OCTANE GASOLINE
The name of the inventor: Sayfullin N.R .; Makhov A.F .; Navalikhin PG; Sudovikov AD; Maltsev AP; Zvyagin II; Arbuzova TV; Nikitina EA; Emelyanov V.E.
The name of the patent holder: Novo-Ufa Oil Refinery Joint Stock Company
Address for correspondence:
Date of commencement of the patent: 1995.07.12
The invention relates to oil refining, in particular, to a process for producing high-octane gasoline and can be used in isomerization and catalytic reforming units of gasoline fractions in order to produce high octane gasolines AI-95 and AI-98. Essence: a method for producing high-octane gasoline, which consists in that the straight-run gasoline fraction of NK-160 ° C is hydrotreated and then fractionated to obtain fractions of NK-85 ° C and 85 ° C -CK, the fraction of NK-85 ° C is isomerized to form Isomerizate and the 85 ° C -CK fraction is subjected to catalytic reforming, then 10-40% of the catalytic reforming gasoline is fractionated to obtain a catalytic reforming gasoline fraction boiling in the range of 110 ° C -CK and the desired product is obtained by mixing a catalytic reforming gasoline fraction of 110 ° C-CS, catalytic reforming gasoline, alkylate and metizate in a weight ratio of 15-40, 30-60, 15-40, 5-15, respectively. Moreover, the hydrotreating of the straight-run gasoline fraction HK160 ° C is carried out at a temperature of 330-380 ° C, a pressure of 3.3-3.7 MPa in the presence of a nickel-molybdenum catalyst. Isomerization of the fraction of NK-85 ° C is carried out at a temperature of 250-280 ° C, a pressure of 2.5-2.8 MPa in the presence of an alumoplatinum catalyst. And it is proposed in some cases to additionally add 1-15% by weight of the desired product. % Of ethers of alcohols C 1 -C 5 or mixtures thereof with lower alcohols C 1 -C 4 .
DESCRIPTION OF THE INVENTION
The invention relates to oil refining, in particular, to a method for producing high-octane gasoline and can be used in isomerization and catalytic reforming units of straight-run gasoline fractions in order to produce high octane gasolines AI-95 and AI-98.
A method for producing auto gasoline is known, which includes the separation of straight-run gasoline NK-200 ° C into fractions of NK-85 ° C (1). 75-115 ° C (II) and 90-200 ° C (III), followed by catalytic reforming under various conditions of fractions II and III, distillation of the reforming product of fraction III, and mixing of the components obtained in a ratio other than in the initial product [1]
The disadvantage of this method is the considerable complexity and, as a result, high energy inputs, as well as the high content of aromatic hydrocarbons in commercial gasoline and the insufficient anti-detonation properties of the latter.
A method for obtaining high-octane gasoline by catalytic reforming of a straight-run gasoline fraction is known, followed by fractionation of 30-90% of the obtained reforming gasoline, with the separation of fractions boiling in the temperature ranges 35-150 ° C and 100-190 ° C and mixing them with alkylbenzene and the head straight-run fraction [ 2]
The disadvantage of this method is the insufficient antiknock properties of the fuels produced, therefore, the addition of ethyl liquid is required to obtain commercial products.
The closest to the proposed technical solution is the method for obtaining high-octane gasoline by catalytic reforming of the straight-run gasoline fraction, fractionation of 30-90 wt. Gasoline catalytic reforming with the separation of the fraction boiling in the range of 35-150 ° C and the subsequent mixing of the recovered fraction with catalytic reforming gasoline and alkylate in an amount of 40-70, 10-30 to 100% by weight of the mixture, respectively.
However, this method does not allow the production of gasolines with an octane number of 95 and above 95 without the addition of ethyl liquid.
The object of the present invention is to expand the assortment of high-octane ecologically clean gasolines produced, and to increase their detonation properties.
To solve the problem, a method for producing high-octane gasoline is proposed, which consists in that the straight-run gasoline fraction of NK-160 ° C is hydrotreated and then fractionated to obtain fractions of NK-85 ° C and 85 ° C -CK, a fraction of NK-85 ° C is subjected Isomerization to form an isomerizate, and the 85 ° C -CK fraction is subjected to catalytic reforming, then 10-40% of the catalytic reforming gasoline is fractionated to obtain a catalytic reforming gas fraction boiling in the 110 C-CK range and the desired product is obtained by mixing the catalytic reforming gasoline fraction 110 ° C-CK, catalytic reforming gasoline, alkylate and isomerizate in a ratio of wt. 15-40, 30-60, 15-40, 5-15, respectively.
Moreover, the hydrotreating of the straight-run gasoline fraction NK-160 C is carried out at a temperature of 330-350 ° C, a pressure of 3.3-3.7 MPa in the presence of a nickel-molybdenum catalyst.
Isomerization of the fractions of NK-85 ° C is carried out at a temperature of 250-280 ° C, a pressure of 2.5-2.8 MPa in the presence of an alumoplatinum catalyst.
In the target product it is proposed and in some cases to add an additional 1-15 wt. Ethers of alcohols C 1 -C 4 or mixtures thereof with lower alcohols C 1 -C 5 .
Distinction of the claimed technical solution from the known is the realization of preliminary hydrotreating and subsequent fractionation of straight-run gasoline into these fractions, and an additional stage of isomerization of the isolated fraction of NK-85 ° C and subsequent mixing of the isomerate with the desired product in the claimed amount.
The specified sequence of operations is new, allows expanding the range and obtaining marketable motor gasoline AI-95 and AI-98 with improved environmental properties without adding ethyl liquid.
When producing marketable gasolines in the invention, it is proposed to introduce 1-15% of C 1 -C 5 alcohols or their mixtures with lower C 1 -C 4 alcohols in order to reduce the proportion of highly aromatized components of catalytic reforming and 110 ° C-CK fraction. For this purpose, methyl (ethyl) tert-butyl, methylfluoropentenyl, diisopropyl, methylamyl esters or mixtures thereof with methyl, ethyl, isopropyl, tert-butyl, fluorobutyl alcohols can be used.
Examples of the method according to the invention are given below.
As raw materials in the examples, a straight-run gasoline fraction of NK-160 ° C was used, the characteristic of which is given in Table. 1. When carrying out the process on an industrial scale, a straight-run fraction of NK-160 ° C obtained from both oil and gas condensate can be used.
Example 1 . Direct gasoline is hydrotreated in the presence of a nickel-molybdenum catalyst at a temperature of 340 ° C and a pressure of 3.6 MPa, then fractionated to fractions of 85 ° C and 95 ° C-CK. The NK-85 ° C fraction is isomerized in the presence of an alumoplatinum catalyst at a pressure of 2.7 MPa, a volumetric feed rate of 2 hr -1 , an inlet temperature of 260 ° C, at an outlet of 280 ° C., isomerizate is obtained, a yield of 98% The characteristic of which is given in Table. 1.
Fraction 85 ° C -CK is reformed in the presence of a platinorene catalyst at a temperature of 560 ° C and a pressure of 2.0 MPa, a feed rate of 1.6 h -1 , a hydrogen gas cycle multiplicity of 1200 nm / m 3 .
A catalytic reformate product is obtained, 20% of which is fractionated to recover a fraction of 110 ° C -CK. The characteristic of reforming gasoline and 110 ° C-CK fraction is given in Table. 1.
The catalytic reforming gasoline fraction 110 ° C -CK, catalytic reforming gasoline, alkylate and metizate are mixed in an amount of 25, 30, 40, 5%, by weight, of the mixture, respectively.
Get gasoline AI-95. The quality of the product is given in Table. 2.
Example 2 . The direct gasoline was hydrotreated under the conditions of Example 1, then divided into two fractions of HC-85 ° C and 85 ° C-CK. The FK-85 ° C fraction is subjected to isomerization under the conditions of Example 1. Fraction 85 ° C -CK is reformed under the conditions of Example 1. A reformate is obtained, 40% of which is accelerated to give a 110 ° C-CK fraction. The 110 ° C-CK fraction, catalytic reformate gasoline, alkylate and isomerate is mixed in an amount of 15, 60, 15 and 10% by weight, respectively, of the mixture. Obtain gasoline AI-95, the quality of the product is given in Table. 2.
Example 3 . The direct gasoline was hydrotreated under the conditions of Example 1, then divided into two fractions of HC-85 ° C and 85 ° C-CK. The NK-85 ° C fraction is isomerized in the presence of an alumoplatinum catalyst at a pressure of 2.7 MPa, a volumetric feed rate of 2 h -1 , an inlet temperature of 250 ° C, at an outlet of 280 ° C, isomerization is obtained, a yield of 98.5% Which is shown in Table. 1. Fraction 85 ° C-CK is subjected to reforming under the conditions of Example 1. A reformate product is obtained, 10% of which is accelerated to give a 110 ° C-CK fraction. The 110 ° C.-CK fraction, catalytic reforming gasoline, alkylate and isomerate is mixed in an amount of 40, 30, 15 and 15% by weight, respectively, of the mixture. Get gasoline AI-98. The quality of the product is given in Table 2.
Example 4 . The direct gasoline was hydrotreated under the conditions of Example 1, then divided into fractions of HK-85 ° C and 85 ° C-KC. The FK-85 ° C fraction is subjected to isomerization under the conditions of Example 3. The 85 ° C-CC fraction is subjected to reforming under the conditions of Example 1. A catalytic reforming product is obtained, 10% of which is accelerated to give a 110 ° C-CK fraction. The 110 ° C.-CK fraction, catalytic reforming gasoline, alkylate and isomerate is mixed in an amount of 25, 35, 25 and 15% by weight, respectively, of the mixture, 12 wt. Methyl tert-butyl ether. Get gasoline AI-98. The quality of the product is given in Table. 2.
From the data given in tab. 2, it follows that the proposed method allows the production of high-octane gasoline AI-95 and AI-98 without the addition of ethyl liquid, which, if used, will reduce environmental pollution.
CLAIM
A process for producing high octane gasoline comprising catalytic reforming of a gasoline fraction, fractionating a portion of the catalytic reforming gasoline to obtain the desired product, mixing the obtained catalytic reforming gasoline fraction, catalytic reforming gasoline and alkylate, characterized in that the straight-run gasoline fraction of NK-160 ° C is preliminarily subjected Hydrotreating, then subjected to fractionation to obtain fractions of HK-85.degree . C. and 85.degree . C. -C.K., a fraction of HK-85.degree . C. is isomerized to form an isomerizate, fractionating 10-40 wt% Of the catalytic reforming gasoline to obtain a catalytic reforming gasoline fraction boiling in the range of 110 ° C -CK and the desired product is obtained by mixing a catalytic reforming gasoline fraction of 110 ° C -CK, catalytic reforming gasoline, alkylate and additionally measured in a weight ratio of 15 40 30 60 15 40 5 15 respectively.
2. A method according to claim 1, characterized in that the hydrotreating of the straight-run gasoline fraction of NK-160 ° C is carried out at a temperature of 330-380 ° C, a pressure of 3.3-3.7 MPa in the presence of a nickel-molybdenum catalyst.
3. A process according to claims 1 and 2, characterized in that isomerization of the fraction of NK-85 ° C is carried out at a temperature of 250 ° -28 ° C., a pressure of 2.5 2.8 MPa in the presence of an alumoplatinum catalyst.
4. A process according to claims 1 to 3, characterized in that 1 15 wt. Ethers, C 1 -C 5 alcohols or a mixture thereof with lower C 1 C 4 alcohols.
print version
Date of publication 07.04.2007gg
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