SU840088A1 - Method of gasoline purification from organosulfuric compounds - Google Patents

Description

(54) METHOD FOR CLEANING PETROL FROM ORGANO-ORGANIC COMPOUNDS

The purpose of the invention is to increase the steg of the cleaning foam.

The goal is achieved by the method of purifying gasoline from organic sulfur compounds by treating the raw material with a complex-forming compound followed by separating the purified product, using copper sulfate dihydrochloride as a complexing agent in a quantity of 3-10 wt.% Of the raw material.

Gasoline distillates are treated with the CesOd 2CH8 reagent at room temperature. The reagent consumption is 3-10% by weight of the distillate. The reagent is vigorously stirred for 1 hour with the distillate, then the mixture is left to stand for 2 hours. The resulting copper dihydrochloride complex with organic sulfur compounds is distilled off from the distillate by filtration. The sweetened benzene distillate is washed 2-3 times with a 1% aqueous solution of alkali (NaOH) and distilled water, until the reaction is neutral.

Organosulfur compounds, if necessary, are regenerated from their complex with copper sulfate dihydrochloride. The complex of copper sulfate copper sulfate with sulfuric acid compounds is washed away from the oil product N with tpentane, and then decomposed by a small amount of hot water.

Numerous experiments have established that the consumption of the reagent is determined by the sulfur content in gasoline and significantly affects the depth of gasoline cleaning. The reagent consumption is below 3% by weight: it does not allow to reach the required depth of cleaning (below 0.03%), and above 10% by weight it practically does not affect the degree of cleaning.

The duration of the mixing of the raw material and the complexing agent affects both the depth of purification and the quality of the purified gasoline. It was found that with a decrease in the mixing time (less than 1 hour), the sulfur content of total and sulfide in the purified distillate increases, and with an increase in the mixing time of more than 1 hour, side processes (gum formation, condensation, condensation of molecules) increase, along with that cleaning almost does not change;

During the desulfurization of gasoline distillate, the content of organosulphur compounds after one treatment decreases 7 times (gasoline purification rate is 86%), and the raffinate yield is 98.5%. This indicates that the extractant under investigation is selective only for organic sulfur. m, and hydrocarbon components. almost

are not affected, which is important for maintaining good performance properties of fuels.

Thus, the proposed method is based on the selective interaction of the CuSO4.2Hce reagent with organosulfur compounds (sulfides and thiophenes).

Copper sulfate dihydrochloride (Cu8Od2NS) is a brown crystalline powder, hygroscopic. The reagent is available and inexpensive, obtained from available raw materials, i. E. by the interaction of hydrogen chloride with dehydrated copper sulfate. The copper sulfate used in the removal of organo-sulfur compounds is recovered from the aqueous solution with almost no loss.

The proposed method for the purification of gasoline distillates from NK to 190 ° is distinguished by selectivity and processability. The method is simple in hardware design and easy to implement at refineries.

In addition, it allows to obtain purified fuels without loss of hydrocarbon components, and, therefore, with preservation of basic octane numbers.

Example 1. 250 ml (182 g) of straight-run gasoline of high-sulfur West-Surgut oil (boiling range 40-190, containing 0.2% by weight of total I-O, 11% by weight, sulfide sulfur, and 9 g of 5% dihydrochloride sulfate. Copper are placed in a flask with a mechanical stirrer. The heterogeneous mixture is stirred vigorously for 1 hour at room temperature, then allowed to stand for 2 hours. The reaction mixture is filtered to separate sweet gasoline (raffinate) from copper sulfate dihydrochloride complex with organic sulfur compounds. The raffinate is washed with 1% aqueous alkali solution (Na OH) and distilled WATER to a neutral medium.After drying over calcined calcium chloride, the total and sulfide sulfur contents are analyzed. The amount of raffinate is 178 g, which is 98.5% of the gasoline load. The total sulfur content is 0.03% Sulfide sulfur in the fuel is missing ,; The degree of purification from organic sulfur compounds 85%,

Example 2. 250 ml of gasoline of direct race for high-sulfur Arlan oil (boiling range 40-200®, containing O 14 weight.% Of total and 0.09 weight,% of sulfide sulfur) process 7 g (4%) of copper sulfate dihydrochloride in conditions of example 1. After settling and filtering, a sweet-faced raffinate with a total sulfur content of 0.02 wt.% is obtained. Sulfur sulphide is present. The distillate yield after purification is 98.7%.

Example 3. 250 ml of straight-run gasoline of high-sulfur Arlan oil (boiling range 50-220 °, containing 0.26% by weight of total and 0.2% by weight of sulfide sulfur) as in Example 1, are treated with d (10%) Copper sulfate dihydrochloride After settling and filtration, a sweet-sour raffinate with a total sulfur content of 0.01% sulfide is obtained. The distillate yield after purification is 98.2%. The degree of purification from organic sulfur compounds 85%.

Example 4. 250 ml of straight-run gasoline of sulfurous Samotlor oil (boiling range 40-190 °, containing 0.08% by weight of total and 0.02% by weight of sulfide cgpH, analogously to example 1, are treated with 5 g (3%) of sul dihydrochloride. copper fata. After settling and filtering, a sweet-white raffinate with a total sulfur content of 0.015% by weight is obtained. Sulfur sulfide is absent. The distillate yield after 98.5%,

Claims (2)

1. Karuzin V.P. and others. Purification of fuels with copper chloride. Works of the Kuibyshev Research 0 Institute of Petroleum Industry, vol. 32, .1965, p. 28-36. 2. USSR author's certificate number 491683, cl. C 10 G 29/06, 1975 (prototype).