SU929698A1 - Process for producing petrol solvent - Google Patents

Description

(54) METHOD FOR OBTAINING SOLVENT GASOLINE

one

The invention relates to methods for producing gasoline-solvent for the paint and varnish industry and can be applied in the petroleum refining, battling and petrochemical industry spheres in the production of gasoline solvents such as white spirit.

A method of producing a gasoline-solvent for the paint and varnish industry is well known and widely used in industry, as follows. The oil is rectified and the fraction of heavy gasoline is boiled with a boiling point up to 160 ° C and a boiling point not higher than 200 ° C ll.

Gasoline-solvent, according to a known production method, can be produced only from special grades of oil. Ensuring the supply of high-grade oil in the presence of a large number of oils in large refineries is difficult. The absence of grade oil or the fluctuation of its quality due to the ingress of other oils leads to the production of defective gasoline-growth or the impossibility of producing it in general. The most difficult to achieve is the content of aromatic hydrocarbons in the gasoline-solvent, which should not exceed 16 wt.% Dp of the usual solvent and 13 wt. 2 for the solvent with a state quality mark. Taking into account certain difficulties in the production of gasoline-dissolve-. l when fluctuating the quality of oil, GOST 3134-78 provides for preferential nori for some enterprises

15 on the content of aromatic hydrocarbons (up to 17 wt.%).

The purpose of the invention is to improve the quality of solvent gasoline.

The goal is achieved

20 by the method of producing a solvent gasoline by distillation of a by-product of the process of the sulfuric acid alkylation of isobutane olefin in with the release of braccine with a boiling point of 145-160 ° C and a boiling point of no more than 200 C.

The precipitated fraction is alkalinized, dried with water by known methods. The resulting fraction is used as a gasoline-solvent or as a component in a mixture with solvent gasoline, in the known manner by distillation of oil.

Example 1. A distillation fraction of up to 200 ° C is recovered from the motor alkylate by distillation on the ARP-2 equipment, the yield of the fraction from the initial motor alkylate is about 58% by weight. The selected fraction is mixed with a solution of caustic soda in a concentration of 10 wt.% In a volume ratio of 0.5 volume of alkali and 1.0 volume fraction. The mixture is separated by settling for 12 minutes. The fraction is separated from the alkali and displaced with water in a volume ratio of 0.5 volume of water and 1.0 volume of the fraction, then it is separated from the water by sludge (about 15 minutes)

The fractional composition of the initial motor alkylate and fractions before is presented in table .. I; the quality of the resulting product in comparison with the requirements of GOST 313478 is presented in Table. 2

20

No more no more

Density, d. 0.780 0.790 0.762

Fractional composition:

distillation temperature, s

distils at temperature, s, 10%

the same J 90%

up to 200 ° C, distilled,%

residue n flask,%

Flash point, in a closed crucible. WITH

T a b l and c a I

Tempepatoo

boil, C Boil over with, T a b i, c a 2

Xylene volatility of 3.0-4.5. 3.0-4.5 3.4

Not higher not higher

WITH

Not more than no bodess

Not moreNo more

th

0.0250.0250.0018

Allocation Instance Allocation

Oops-Obstst-No

Not darker than the reference test of solvents withstand the low rate of not more than 17%.

The resulting product for all mandatory indicators corresponds to GOST. The aniline dot index is optional and the analysis is performed for special cases.

Example 2. The solvent gasoline obtained by direct distillation of oil does not meet the requirements of GOST 3134-78 in terms of the content of aromatic hydrocarbons, including taking into account the preferential rate (Table 3). Dp correcting defective gasoline-solvent prepare a mixture of gasoline-1) solvent 75 ob.h., and the product according to the proposed method 25 ob.h.

Changes in some indicators of the quality of rejected solvent gasoline with the addition of solvent gasoline obtained by the proposed method are presented in Table 3.

9296986

Continued table. 2

626583,6 em clear colorless liquid

Table 3

Combine

Indicators

Gasoline additive solvent, the removal of 25 vol .-% of the product separated from the oil according to the proposed method

Aniline point, C58,263,4

Mass fraction of aromatic hydrocarbons,% 20.0 15.3

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Claims (1)

The quality meets the requirements of GOST 3134-78, except for the content of aromatic hydrocarbons. The quality indicators of the plant (Table 3) comply with the requirements of GOST 3134-78. The product obtained by this method table. 2), can be used as a component for the correction of defective solvent gasoline obtained from oil in a known manner without breaking the aniline standard. Thus, it was confirmed the technical possibility and feasibility of obtaining the product by the proposed method and using it as a solvent gasoline or a component of solvent gasoline for paintwork. 8 8 The invention The method of obtaining a gasoline-solvent by distillation of hydrocarbon raw materials with the extraction fraction with a boiling point of 145-160 C and no more than the end of boiling, characterized in that, in order to improve the quality of the target, a byproduct of the process is used as hydrocarbon sulfuric acid alkylation of isobutane with olefins. . Sources of information taken into account during the examination 1. GOST 3134-78 (prototype).