RU1778139C - Method for producing asphalt mix - Google Patents

Abstract

Usage: oxidation of petroleum bituminous sorbents, asphalt mixtures, road construction. SUMMARY OF THE INVENTION: An asphalt mixture is prepared by mixing heavy petroleum products together with a hot mineral filler with an intermediate stage of oxidizing the components of the mixture by blowing with heated air. A mixture of oil bituminous rock with a bitumen content of 15 wt.% And a heavy oil residue obtained from oil production from a well with a boiling point of 350 ° C taken in such an amount that the mass ratio of the sum of organic substances is used as oil products contained respectively in the rock and residue is 1: (1-2), mixing is carried out at 40-50 ° C, then the mixture is heated to 180-260 ° C and the mixture is purged with air 0.8-5, 0 l / min per 1 kg of the mixture to obtain a product with a softening temperature of the ring and ball 30 and 50 ° C, then it is mixed with a mineral filler - a mixture of sand and crushed stone. 7 tab. next to

Description

The invention relates to the field of petrochemistry, in particular to the production of an asphalt mixture from oil bituminous rocks (NBP) and oil residue by their oxidation and can be used in road construction.

There is a known method of preparing mixtures from natural materials of deposits (for example, the Kara-Murat deposit), with the following composition being extracted: crushed stone of Thracia 5-15 mm from the Alekseevsky crushed stone plant, activated mineral powder of one of these plants and anionic surfactants.

The disadvantage of this method is the direct use of environmentally harmful oil bituminous rocks to obtain an asphalt mixture, because they contain about 25-30% of light hydrocarbons with a boiling point below 350 ° C. In summer, these hydrocarbons evaporate and cause great harm to nature and the environment, and at the same time, the strength characteristics and service life of roads are deteriorated.

A known method of preparing an asphalt mixture, including mixing the tar with a mineral filler and oxidation by blowing air with a temperature of 150-ZPPOS with an air velocity of 1.5-6 m / min

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The disadvantage of this method is the use of scarce material of mineral powder, high air consumption, high cost of the mixtures obtained, since directly from tar it is possible to obtain special bitumen and varnishes for various purposes and the low strength and water resistance of the asphalt mixture.

The aim of the invention is to increase the strength and water resistance of the final product. At the same time, it is proposed to use cheap material - a mixture of NBP and the addition of oil residue from highly viscous oils with a high content of asphalt-resinous components and sulfur compounds.

The essence of the method lies in the fact that oil bituminous rocks with a bitumen content of 15%, the rest is mineral component (AlaOa - 13.08%; TI02 - 0.81%; 5102-65.18%; Fe20z-0.76%; FeO- 2.23%; MgO - 1.26%; MnO - 0.03%; CaO - 3.45%; NaaO - 3.75%: P20s - 0.8%) and the rest of the impurity, pre-mixed with the addition of oil the remaining oil of the Kara-Arna field (15 and 30%) and fed to the mixer at a temperature of 40-50 ° C. Then, uniform mixing is carried out until a homogeneous mixture is obtained. Next, 1 kg of the finished mixture is loaded into the laboratory unit and the temperature is raised to 180-260 ° C to conduct the oxidation process. After reaching the indicated temperature, air (0.8-5.0 l / min kg) is supplied. The content of the organic part in the initial NBP and a mixture of NBP with an oil residue was determined by extraction with a mixture of ethanol + benzene at a product: solvent ratio of 1: 1 in a Soxhlet apparatus until the extractant was completely discolored. Then, the solvent was distilled off using an Engler apparatus at the boiling point of the ethanol + benzene mixture, and the non-evaporated organic substance (bitumen) was dried at 40-50 ° C in vacuo to constant weight. Per 100 g of rock, the yield of bitumen was 15 g (15%). The experiment was repeated three times for reliability.

The physicochemical characteristics of the Kara-Arn oils and bitumen from Kara-Murat NBP are presented in Table 1. From the data of Table 1 it can be seen that the physicochemical characteristics of the residual oil and bitumen differ from each other in density, viscosity, molecular weight, coking ability, and flash point. They are similar in elemental composition, with the exception of the sulfur content in the remainder of Kara-Arn oil and oxygen in Kara-Murat bitumen.

From the data (table 1) of the group composition shows that the oil content is significantly

more in the remainder of Kara-Arn oil, and asphaltenic-resinous components in Kara-Murat bitumen.

Upon atmospheric distillation of the residue of oils with a boiling point above 350 ° C, it is seen that the content of light fractions is absent, and up to 350 ° C is 7%, the rest is the remainder. Only 3% of gasoline fractions are contained in bitumen up to 200 ° С, and up to 300 ° С

At 0 and 350 ° C, the yield of light fractions was 23%, the rest was the remainder.

It follows from the foregoing that the remainder of Kara-Arna oil and bitumen from the NBP can be the starting products for producing bitumen. However, according to the proposed method, it is possible to simultaneously use the initial oil bituminous rocks with the addition of the oil residue of the oils.

The proposed method is implemented as follows. 15-30% of the oil residue of Kara-Arna oil (1: 1,1; 2) in the organic part is added to the oil-bituminous rock of the Kara-Murat field with a content of 15% bitumen.

5 to a homogeneous mass, the resulting mixture in an amount of 1 kg is loaded into the reactor. The temperature of the oxidation process is brought to 150 ° C; 180 ° C; 220 ° C; 260 ° C; 300 ° C. After reaching the temperature, the reactor is fed

0 air 0.8; 2.0; 5.0 l / min-kg.

Example 1. In a laboratory setup, 1 kg of oil bituminous rock of the Kara-Murat field is loaded and the temperature is raised to 180-260 ° C, after reaching 5 temperatures, air is supplied with 0.8-5.0 l / min-kg. Every 15-30 minutes, a sample is taken to determine the softening temperature. Characteristics are given in table 2. From the data of table 2 shows that

0, the duration of the oxidation, depending on the softening temperature, is 28-30.5 hours.

Example 2. According to the conditions of Example 1, 1 kg of the finished mixture of oil bituminous rock from the Kara-Murat field and the oil residue of Kara-Arna oil is loaded into the laboratory unit at a ratio of 1: 1 in organic part (Table 3). From the data in Table 3 it follows that significantly reduces 0 s the duration of the oxidation process with improved characteristics.

Example 3. According to the conditions of examples 1 and 2, 1 kg of the finished mixture of oil bituminous rock is loaded into a laboratory unit

5 of the Kara-Murat field and the oil residue of Kara-Arna oil at a ratio of 1: 2 (Table 4). It can be seen from the data in Table 4 that the duration of the oxidation process is reduced slightly compared to the data in Table 3.

Example 4. According to the conditions of Example 1, 2 and 3, 1 kg of the finished mixture of oil bituminous rock of the Kara-Murat field and the remainder of the Kara-Arna oil was loaded into the laboratory unit at a ratio of 1: 2. The oxidation process is carried out at a temperature of 150 ° C and 300 ° C and an air flow rate of 0.8; 2.0; 5.0 l / min.kg (Table 5). It can be seen from the data of Table 5 that at an oxidation temperature of 150 ° C, the oxidation time increases slightly, and the softening temperature also slightly increases. With an increase in the oxidation temperature to 300 ° C, accordingly, the duration of the oxidation process decreases, the softening temperature does not change.

Thus, from the data of Table 5 it follows that the optimum oxidation temperature is 180-260 ° C, since it is energetically advantageous to carry out the process at these temperatures.

Example 5. Based on the products of co-oxidation of bituminous rocks and the oil residue of Kara-Arna oil, asphalt concrete was obtained, the characteristics of which are presented in Table 6.

The mixture is prepared in a laboratory paddle mixer. Crushed stone and sand (pre-dried) in quantities specified by composition are weighed into a container, heated to a temperature of 30-50 ° C, and the required amount of a mixture of BWP with an oil residue is added to the final materials (see Table 6). The resulting asphalt mixture does not meet the requirements of GOST 12801-84 for cold asphalt.

Example 6. A hot mixture is prepared according to GOST 12801-84 in a laboratory paddle mixer equipped with a heating device. Crushed stone and sand (pre-dried), in quantities specified by composition, are weighed and loaded into a container, heated to a temperature of 200 ° C. to the hot stone materials (see tab. 6), the required amount of a mixture of NBP with oil residue is added and intensively mixed for min, then the resulting mixture is tested by standard methods. The resulting mixture meets the requirements of GOST, as a hot asphalt mixture.

The characteristics of semi-crude bitumens after the process of joint oxidation of NBP and oil residue are presented in Table 7.

From the data of Table 6 it follows that the resulting mixture according to physico-mechanical properties complies with the requirements of GOST 9128-84 for a hot method for producing asphalt concrete. In addition, in the production of asphalt concrete based on the products of the joint oxidation of oil bituminous rocks and oil residue, the use of mineral powder (material deficiency) is excluded in the construction of atomic roads.

As a result of tests of the obtained asphalt concrete, it was also established (Table 6) that the compressive strength increases in comparison with the prototype method

from 16% to 50%, and the coefficient of water resistance - by 20%, which as a result with a cheaper composition of the mixture will provide a longer service life of the road surface.

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Claims (1)

The claims A method of producing an asphalt mixture, comprising mixing heavy oil products with hot mineral filler and an intermediate stage of oxidation of the components of the mixture by blowing it with heated air, characterized in that, in order to increase the strength and water resistance of the final product, petroleum bitumen with a bitumen content of 15 wt.% and heavy oil residue is used as oil products, obtained during oil production from a well with a boiling point 350 ° C. taken in such an amount that the mass ratio of the sum of organic substances contained in the rock and residue, respectively, is 1: (1-2), and mixing is carried out at 40-50 ° C, then the mixture is heated to 180-260 ° C and they purge the mixture with air at a speed of 0.8-5 l / min per 1 kg of the mixture until a product is obtained with a softening temperature in the ring and ball of 30 and 50 ° C, and then it is mixed with a mineral filler in the quality of which is used a mixture of sand and crushed stone in an amount of 83 wt.% calculated on the final product. Table 1 Physico-chemical characteristics of Kara-Arn oil and bitumen from oil bituminous rocks of the Kara-Murat field Depth, m Bitumen yield per 100 g of rock, g twenty Density, S. kg / m3 Viscosity, .sec at 20 ° C Molecular mass Cokeability,% Softening temperature, ° С. (K and Sh) Flash point in a closed crucible, C Elemental composition,% ate 40 fifteen 989.5 50.21 550 9.5 195 Characterization of the oxidized NBI of the Kara-Mur t Table 3 Characterization of products of compatible oxidation of the NBP of the Kapa-Myt.at field and the Kara-Arna oil residue at a mass ratio of 1: 1 and based on the content of organic substances in the foam and residue Tablia Z Table t Characterization of the products of combined oxidation of the NBP of the Kara-Murat field and the Kara-Arnch oil residue at a ratio of 1: 2 (see table 3) Table 6 Physico-mechanical properties of asphalt concrete obtained from products of co-oxidation of the NBP of the Kara-Kurat field and the Kara-Arn oil residue are taken in the ratio equal to the content of organic substances in the rock and the residue 1: 2 Cold way Crushed stone - 32 Granite sowing - 51 Index According to the proposed method 48s 36-54 -21.-25 208-240 20.0 32.0 48.0 Table 7 in the way Bitumen characteristic By A.S. No. 562533 38s 24 8.6 23.0 68.4