RU2264251C2 - Device for producing bitumen-polymeric materials - Google Patents

Abstract

FIELD: chemical or physical processes.

SUBSTANCE: device comprises unit with a mixing member, branch pipe for supplying gas phase, and outer circulation circuit that is composed of lines for polymer solution and vapors. The line for polymer solution is additionally provided with the unit with mixing member made of a blade mixer mounted on the shaft. The unit is hollow and defines the passage for supplying gas phase. The outer circuit of circulation may be additionally provided with a condenser mounted in the vapor line and condensate collector connected with the unit with the mixing member. The units with mixing members may be also provided with deflecting baffles mounted on the inner sides of the units with a spaced relation to the blade b = (0.3-3)h_m, where h_m is the height of the mixer blade. The deflecting baffles are mounted at an angle to the axis of the unit with the mixing member.

EFFECT: enhanced efficiency.

3 cl, 2 dwg

Description

The invention relates to devices for conducting mass transfer processes of the interaction of gases with polymer solutions in petroleum solvents and can find application in the petroleum, petrochemical, chemical industries, as well as other industries.

A known installation for producing modified bitumen, consisting of a volumetric apparatus, inside which is located a switchgear made in the form of pipelines of an external circulation circuit, containing a static mixer with a pipe for supplying a gas phase (RF Patent 2183500 of 05.15.2001).

The known installation can be used to produce bitumen-polymer materials by combining petroleum bitumen with various liquid viscosity modifiers of low viscosity in a static mixer with the distribution of the mixture in the volume of the apparatus using a distribution device.

However, this device does not give the desired effect when using solid polymers to obtain a mixture of high viscosity, for example, solutions of TEC, synthetic rubbers, etc. Because it has a static principle of operation and is made of fixed parts, it is not able to evenly distribute highly viscous products at each point of the volume of the oil product, and as a result, it can accumulate at a certain point in the volume or float to the surface of the combined mass of the liquid product.

There is also known an apparatus for carrying out gas-liquid reactions and mass transfer processes, comprising a volumetric apparatus with a mixing device, an external circulation circuit with a pump, a jet-type mixing device with a nozzle for the gas phase, and also a nozzle whose intake opening is made at the level of the mixer (RF Patent 1676439 from 07.09.91, IPC B 01 J 19/24).

At this installation, it is possible to obtain materials with a wide range of indicators of bitumen-polymer materials, process highly viscous products and carry out oxidative reactions in a gas-liquid system, and combine oil liquids with each other with sufficient efficiency.

But this well-known installation has a drawback that does not allow to expand the scope of its application. For example, it will not be effective when using solid polymers, synthetic rubbers, thermoplastic elastomers, etc. as a modifier. It lacks structural elements capable of creating conditions for the rapid dissolution of polymer particles in petroleum liquids. All this reduces its productivity and narrows the scope.

The aim of the present invention is to increase the efficiency and productivity of the installation for the production of bitumen-polymer materials using solid polymers.

To achieve the goal, an installation for producing bitumen-polymer materials, comprising an apparatus with a mixing device with a pipe for supplying a gas phase, an external circulation circuit consisting of polymer solution lines and vapors, where the polymer circulation line is additionally equipped with a device with a mixing device in the form of a paddle mixer, mounted on a shaft made hollow and forming a channel for supplying the gas phase, in addition, the installation is equipped with a condenser mounted on the vapor line, and a condensate collector, with Unification with the machine with a stirrer. In addition, apparatuses with mixing devices are equipped with reflective baffles installed inside on the walls with a gap between the blades and baffles, determined by the formula: b = (0.3 ÷ 3) h _m where h _m is the height of the mixer blade. These partitions can be placed at an angle to the axis of the apparatus.

Figure 1 shows the installation for producing bitumen-polymer materials.

The installation consists of apparatus 1, Fig. 1, with a mixing device made in the form of a paddle mixer 2. Reflective walls 3 are mounted inside the apparatus and nozzles 4, 5 are additionally arranged for the inlet and outlet of liquid circulating along the external circulation circuit. A pipe 6 is provided for supplying a gas phase, a pipe 7 for supplying raw material streams, a hatch 8 for polymer supply. Pumps 9, 10, 11 are used for pumping liquids. The apparatus 1 is also equipped with a gas phase 12 supply line.

The installation is additionally equipped with an apparatus 13, Fig. 1, with a mixing device with a paddle mixer 14, mounted on a hollow shaft 15 with holes 17, 24, Fig. 2. Reflective baffles are installed inside the apparatus 16. In addition, the apparatus is equipped with nozzles for supplying fluid along the external circulation circuit 18, 19, 20 and venting vapors 21 into the condenser 22, which is connected to the collector 23, where the condensate accumulates.

Installation works as follows. Through the pipe 7 to the apparatus 1 is fed from the warehouse oil raw materials and other liquid components, such as surfactants or accelerators and oxidation activators. In addition, a polymer (modifier), for example, synthetic rubber SKEPT, is loaded into the apparatus 1 through the hatch 8. In the apparatus, the process of mechanical mixing. The interaction of the agitator blades with the baffles allows you to subject the stirred mixture of petroleum raw materials with polymer and other components to shear deformations. Thus, conditions are created for increasing the speed of movement of the liquid, petroleum feedstock, relatively solid rubber particles and mechanical grinding of the solid phase, which leads to an acceleration of the dissolution of rubber and its uniform distribution over the mixing volume. The smaller the gap between the ends of the blades of the mixer 2 and the partitions 3, the more intensive is the process of mechanical grinding of rubber particles. But at the same time, the cost of electricity for the implementation of the process increases.

With an increase in the gap, the conditions for the flow of liquid relative to the rubber particles improve, however, the effect of mechanical grinding decreases or eliminates, which reduces the intensity of the process of dissolution of the modifier in the crude oil.

Therefore, the present invention proposes the optimal distance between the reflective partitions and the blades of the mixer, equal to b = (0.3 ÷ 3) h _m , where h _m is the height of the blade of the mixer, Fig.2. Figure 2 shows in General view the apparatus with a mixing device. Where pos.25 - drive of the electric motor of the mixing device, 26 - gearbox, 15 - hollow shaft, 16 - baffles, 2 - paddle mixer, pos.17, 24 - openings for air supply to the mixture.

Figure 2 indicates the location and possible geometric dimensions between the reflective partitions and the blades in accordance with the calculation formula.

The resulting polymer solution in the apparatus 1, Fig. 1, can be subjected to treatment with air and / or another oxidizing agent in order to conduct partial or complete oxidation and bring it to the level of a bitumen-polymer material, used for example for road construction. However, as a rule, this is not enough when obtaining bitumen-polymer materials more viscous, with a higher softening temperature used, for example, as mastics or waterproofing materials. To do this, in the external circulation circuit on the line of the polymer solution is installed apparatus with a mixing device 13, Figure 1. A rubber solution from apparatus 1 enters through the nozzle 19 into it. In the apparatus 13, FIG. 1, the process of further interaction with an oxidizing agent, for example, atmospheric oxygen, is carried out. In it, a viscous liquid comes into contact with a finely dispersed gas phase, air. The device apparatus is additionally shown in FIG. 2.

This is achieved by the fact that the apparatus has a hollow shaft 15 with holes pos. 17, 24 for supplying air (see Figure 1). As a result of the rotation of the paddle mixer through the holes 17, air is sucked in and evenly distributed throughout the mixed volume. This is facilitated by the reflective partitions installed inside the apparatus 16. The resulting vapors from the apparatus 13 enter the condenser 22, from where the condensate is supplied to the collector 23 and returned by the pump 9 to the apparatus 1 to prepare the next batch of polymer solution.

All the distinguishing features of the invention used make it possible to intensify the process of dissolving solid particles of the polymer (modifier), as well as bring it to the performance of bitumen-polymer materials with various properties, for various purposes such as modified road bitumen, cementitious for the preparation of asphalt concrete mix, roofing bitumen, mastics for pouring joints and deformation cracks in asphalt concrete pavements of roads, waterproofing mastics, etc.

The implementation of the present invention does not require specific equipment, can be located in a small area, environmentally friendly, does not require large capital investments.

The invention allows to intensify the process of obtaining high-quality bitumen-polymer materials, reduce energy costs, reduce costs, expand the range of products with a wide range of indicators, depending on the purpose of the climatic operating conditions.

Claims (4)

1. Installation for producing bitumen-polymer materials, comprising an apparatus with a mixing device with a pipe for supplying a gas phase, an external circulation circuit consisting of polymer solution lines and vapors, characterized in that the polymer solution line is additionally equipped with a device with a mixing device in the form of a blade a mixer mounted on a shaft made hollow and forming a channel for supplying a gas phase. 2. Installation for producing bitumen-polymer materials according to claim 1, characterized in that the external circulation circuit is equipped with a condenser mounted on the vapor line and a condensate collector connected to the apparatus with a mixing device. 3. Installation for producing bitumen-polymer materials according to claim 1, characterized in that the devices with mixing devices are equipped with reflective walls installed inside on the walls of the devices with a gap between the blade and the partition equal to b = (0.3 ÷ 3) h _m where h _m is the height of the stirrer blade. 4. Installation for producing bitumen-polymer materials according to claim 3, characterized in that the reflective partitions are installed at an angle to the axis of the apparatus with a mixing device.

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