RU2271379C1 - Method for building bitumen production - Google Patents

Abstract

FIELD: working-up pitch, asphalt and bitumen by chemical means by blowing or oxidizing.

SUBSTANCE: method involves oxidizing raw material with oxygen from air with the use of cavitational-vortex gas-liquid apparatus installed in raw material supply line; directing 5-10% of air flow for primary raw material oxidizing in wave field with consecutively oxidizing gas-liquid mixture in fine state for 30-60 sec depending on gas-liquid mixture supply pipeline length and diameter; finally oxidizing thereof in oxidizing column in full mode.

EFFECT: reduced power inputs and air consumption, increased product quality and output.

5 cl, 2 ex

Description

The invention relates to the chemical and oil refining industries and can be used in the production of building bitumen.

A known method of producing building bitumen and a device for its implementation / R.B. Gun. Oil. M. ed. "Chemistry", 73 g.

The essence of the known method for producing building bitumen is the interaction of the gas phase with the feed in several reaction columns. The feed enters the column and is oxidized by low pressure air. The oxidized product from the bottom of the column enters the tank. It is fed from a tank to a coil reactor, and high pressure compressed air for oxidation is supplied to the same reactor. Then the oxidized bitumen is fed to the evaporator, in which the gas-forming oxidation products are separated from the oxidized bitumen; oxidized bitumen is sent for recycling or to the fleet.

The disadvantages of this method are: low efficiency, high metal consumption associated with the use of a coil type reactor. In addition, the implementation of the method requires air low and high pressure.

The closest technological solution to the claimed invention, the prototype is a method for producing bitumen (RF Patent No. 2167183 C1, 05.20.2001).

The method consists in the fact that the crude oil is subjected to oxidation in an oxidation column by supplying air through perforated pipes located inside the column into the layer of raw materials. Then, the product of the bottom of the column and additionally supplied air are subjected to processing in a dispersing apparatus, creating an excess pressure of 1-3 kg / cm ² in the resulting gas-liquid mixture with a frequency of dynamic pulsations of the flow 400-3000 Hz inside the dispersing apparatus, followed by returning the treatment product to the oxidation column.

The disadvantage of this method are:

- high energy costs for recycling part of the product of the bottom of the column through a dispersing apparatus, since it is necessary to involve an additional crushing device to create an excess pressure of 1-3 kgf / cm ² ;

- decrease in productivity due to the separation of the product flow of the bottom of the column into a circulating and finished product;

- in the known method, and in particular in table 2, comparative indicators of experience No. 5 and experience No. 24 (prototype), a significant change in quality indicators is not observed;

- increased air flow for the oxidation process, since it requires the involvement of an additional amount of the latter in the dispersing apparatus.

The objective of the invention is to reduce energy costs and oxidation time, improving product quality, reducing air consumption, increasing productivity.

This problem is solved by the fact that in the method of producing building bitumen by oxidizing the feedstock with atmospheric oxygen using a gas-liquid cavitation-vortex gas-liquid apparatus installed on the feed line. 5-10% of the total air volume is directed to the preliminary oxidation of the feedstock in a wave field, followed by oxidation of the gas-liquid mixture (GHS) in a finely dispersed state for 30-60 s, depending on the length and diameter of the GHS supply pipe and afteroxidation in the oxidation column in full mode.

The method is as follows. An external gas-liquid cavitation-vortex apparatus (VGHKVA) is installed on the feed line of the feedstock to the oxidation column, at the outlet of which the feed stream in the finely dispersed state is in contact with 5-10% of the total volume of the tangentially moving air flow (Figure 1) obtained by the GHS arrives at oxidation within 30-60 s, depending on the length and diameter of the GHS supply line and after-oxidation in the oxidation column in full mode.

In the process of wave action on the oil residue in a tangentially swirling flow of oxygen in the air, in contrast to the bubble method of oxidation, not only the oxidation of the feedstock occurs, but also a sound-chemical oxidation reaction (Figure 2). If the total constant of the oxidation reaction rate for raw materials with a softening temperature (according to the KiS method) equal to 14.5 ° C is 0.07, then for the oxidation process of this raw material with a wave action of 0.12. A comparison of the rate constants of the oxidation reaction shows that the wave action accelerates the process of oxidation of the oil residue almost twice.

Table 1 shows the quality of the finished product without use and using VGZHKVA.

Table 1 Options Raw Material: Tar With the use of VGZHKVA Without the use of VGZHKVA Productivity, m ³ / h 25 eighteen Air consumption, m ³ / h on, m raw materials 103,2 133.9 The temperature in the column of oxidation, ° C 246 268 Oxidation temperature, ° С 264 264 Softening temperature according to KiSh, ° С 74.3 73 Penetration at 25 ° C, × 0.1 mm 28 25

From table 2 it is seen that in the present invention, air consumption is reduced compared to the prototype, the quality of the resulting bitumen is improved, which, in turn, will ensure its widespread use in the production of building bitumen, as well as a decrease in the oxidation temperature in the oxidation column.

Example 1. At the laboratory bench, experiments were performed to visually determine the ratio of air to raw materials in the GHS.

The data obtained by analyzing the temperature change of the gas-liquid mixture after VGHKVA depending on the amount of air supplied per 1 m ^{3 of} raw materials are presented in table 2.

table 2 Process parameters The flow rate of air supplied to the remote GZHKVA,% of the total volume 1,5 3.0 4,5 6 7.5 8.0 9.0 10 Initial temperature, ° С 129.4 129.4 129.4 129.4 129.4 129.4 129.4 129.4 Final temperature, ° С 133.2 135.4 137.3 138.2 137.4 136.5 136.5 136.4 Temperature Change, ° С 3.8 6 7.9 8.8 8 7.1 7.1 7 The increase in softening temperature according to KiSh, ° C 0.704 1,097 1,343 1,384 1,218 1,033 0.979 0.925 The amount of heat of reaction, kJ 106508 165870 203042 209274 181399 156226 148069 139863

From the results of the experiments it is seen that the optimal amount of air is from 5 to 10% of the total amount supplied to the oxidation of air to obtain the finished product.

Example 2. The experiment was carried out on the same laboratory bench, with the same apparatus as in example 1. The transit time of the GHS in the GHS feed pipe after the HSSA to the oxidation column was changed by increasing the length of the pipeline. The experimental data of the temperature change of the gas-liquid mixture depending on the length of the supply pipe GHS after VGHKVA are shown in table 3.

Table 3 Measuring points Distance from VGZHKVA to measuring points, m The ratio of raw materials: air supplied to VGZHKVA, 1:10 Temperature ° C GHS passage time, s. t ₁ 0 140.3 0 t ₂ 0.6 135.9 3 t ₃ 6.2 130.8 22 t ₄ 11.6 134.1 thirty t ₅ 13.5 136.6 40 t ₆ fourteen 138.2 60 t ₇ 14.7 138.5 68 t ₈ 15,5 138.8 70

The table shows that the effective oxidation mode, depending on the length of the pipeline at a certain diameter after VGHKVA to the oxidation column increases, which corresponds to the optimal transit time of the GHS in the range from 30 to 60 s in this experiment. This leads to volumetric flow, i.e. the passage of a unit volume of the pumped medium through a unit area per unit time.

Claims (1)

A method of producing building bitumen by oxidizing the feedstock with atmospheric oxygen using a gas-liquid cavitation-vortex apparatus, characterized in that the gas-liquid cavitation-vortex apparatus is installed on the feed line, 5-10% of the total air volume is sent to the preliminary oxidation of the feedstock in the wave field followed by oxidation of the gas-liquid mixture in a finely dispersed state for 30-60 s depending on the length and diameter of the gas-liquid mixture supply pipe and docks techniques, are in an oxidation column in the full mode.

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