Bitumen manufacture process

FIELD: manufacture of road building materials.

SUBSTANCE: process comprises compounding commercial bitumen (92.5-97.5%) with petroleum processing product (2.5-7.5%), in particular bitumen converter, which is preliminarily obtained in the form of straight-run petroleum fraction from heavy low-paraffin naphthenic-base petroleum with kinematic viscosity 65-85 cSt at 50°C. Commercial bitumen is characterized by penetration at least 68 (25°C) and stretchability above 150 cm at 25°C.

EFFECT: improved performance characteristics of product and simplified manufacture technology.

4 tbl, 4 ex

 

The present invention relates to the technology of producing materials used for the construction of roads, in particular, to technology for processing oil road bitumen, and can find application in the oil industry, especially in road-building organizations for operational quality control of asphalt mixtures.

A method of obtaining bitumen by deep oxidation of heavy oil residue, followed by mixing (compounding) formed perechislennogo product with non-oxidized oil residue, after which the resulting mixture was subjected to vacuum distillation (see USSR author's certificate No. 446531, MKI With 10 3/04, published 15.10.1974).

The disadvantage of this known invention is the complexity of the technological process of obtaining bitumen, which can only be used at the refineries. This is due to the presence of vacuum distillation of the mixture, which, in turn, eliminates the possibility of using such a known method of producing bitumen directly in road-building organizations.

There is a method of obtaining bitumen, including compounding trademarks of bitumen from the oil refining product, and, initially producing deep oxidation of heavy oil residue, and then the ride compounding product of oil refining as the latter use is not oxidized oil residue, however, as formed perechislennogo product use the product bitumen, known as bitumen varnish brand ″D″, while the quality is not oxidized oil residue using petroleum tars from the group of oils, for example Yarega, West-Siberian and Courtemanche in the following ratio, wt.%: commodity bitumen grade ″D" 17-46; oil tars from the group mentioned oil - the rest. It should be noted that the process of compounding is carried out at 145-175°and mixing time is not less than 10 min (see the Patent of Russia, having got no 2130044, MKI With 10 3/04, published in bull. No. 13 from 10.05.1999).

It is known for the invention is selected as a prototype, because it has the largest number of total essential features with the claimed invention, and is the latest development in this field.

Compared with similar prototype has the advantage because it simplifies the process and allows for a shorter period of time to get the bitumen on-site extraction and processing of oil. However, a marked advantage at the same time is a significant drawback, since this known method of producing bitumen cannot be used in road construction, i.e. directly in the field of preparation of road building is lnyh materials.

The present invention is to provide a method for production of road bitumen, which could be used in road-building organizations for the preparation required for the quantity of bitumen having a high performance in their basic characteristics, including penetration (to measure the depth of needle penetration at 25°S, 0.1 mm). Also, would a simple technology.

The problem is solved so that the known method of production of road bitumen, including compounding trademarks of bitumen from the oil refining products, according to the present invention, the quality of the product refining use of bitumen Converter, which is previously obtained as an oil fraction of direct distillation of heavy allopurinol oil naphthenic base with a kinematic viscosity at 50°within 65-85 FTAs, as well as trademark use bitumen bitumen with a penetration at 25°With not less than 50 mm 10-1and elongation at 25°With more than 150 cm in the following ratio, wt.%:

the above product

refining 2,5-7,5

the above commodity

bitumen 92,5-97,5

This new technical solution to all your set of essential features allows to obtain high-quality bitumen in the conditions is x road-building organizations, i.e. directly in the field of preparation of road-building materials, where there are often problems with the volume and with the required quality of the bitumen. In addition, the proposed method allows to manage qualitative and quantitative characteristics of bitumen, adjusting them under existing conditions construction of the road.

Compared with the prototype of the invention has significant differences, which consist in the use of the new component.

Analysis of patent and scientific and technical information made by the applicant have shown that the proposed set of essential features is not known. Therefore, it is possible to recognize that the claimed invention is new.

The proposed method for obtaining bitumen involves an inventive step, because it is for the specialist does not follow logically from the prior art technique, and contrary to known trends in the development of technology for bitumen. For example, it is known that ″...mixing bitumen of various properties and nature to achieve and to change their main physico-chemical parameters″. However, ″...mixing lead with the help of solvents, fusion, emulsification and other methods″. As a result, in the United States by compounding the original bitumen continuously mixed with other original bitumen in the stream, i.e. in terms of the refinery on its production lines (see Rebgun. Petroleum bitumen, Publisher ″Chemistry″, Moscow, 1973, str-266). It is obvious that the proposed method for obtaining bitumen involves an inventive step, as it involves the application of a new functional component bitumen Converter, to predict the occurrence of which was only possible as a result of the great authors of scientific research.

Based on the above, we can assume that the inventive method for the preparation of bitumen involves an inventive step.

As for industrial applicability, it is confirmed by the following description with examples and experimental measurements.

In the preparation of road construction materials in advance skaplivaet the most common grades of bitumen and prior bitumen Converter. It is obtained in the form of petroleum fractions by straight distillation of heavy malabaristas oil naphthenic base, characterized by a kinematic viscosity at 50°within 65-85 cSt. In this case, the Converter is received from the Yarega oil. The latter was chosen depending on the desired values of penetration (depth of needle penetration at 25°0.1 mm) of the final bitumen.

The best variant of implementation of the proposed method involves the use of a trademark bat is s, importance of penetration (depth of needle penetration at 25°0.1 mm) not less than 50. The value of penetration is most common for a number of bitumen that is used on the roads of Russia. The road surface must have crack resistance, which depends on the ability of the bitumen to stretch. The higher the elasticity, the higher the crack resistance of the road surface. It should be noted that the Applicant, as an example, selected grades of bitumen: bitumen, BDU 70/100 (TU-91 ″Bitumen road improved BDU″), BUS (TU 0256-096-00151807-97 ″Bitumen road improved from the West Siberian oil″).

For the preparation of laboratory samples compounded bitumen recommended bitumen and bituminous Converter on the basis of which plans to release a commercial batches compounded bitumen.

Example 1

Source components:

bitumen grade BDU 50/7 - 97.5 wt.%;

bitumen Converter (kinematic viscosity at 50°S - 68 cSt) - 2.5 wt.%.

Method of preparation: bitumen Converter injected into molten at a temperature of 165°bitumen; the components are stirred at the same temperature for 20 minutes with a mechanical stirrer blade type (about 150 rpm).

A similar formulation compounded bitumen was prepared by introduced what I bituminous Converter in melted at 165° With bitumen and subsequent mixing with the circulating pump for 1 hour.

Physico-mechanical properties of original and compounded bitumen are presented in table 1.

Table 1
Name of indicatorThe original bitumenCompounded bitumen grade
 The BDU 50/70The BDU 70/100*
The depth of needle penetration at 25°S, 0.1 mm6884/85
Softening temperature, °4746/46
The elongation at 25°cmMore than 150More 150/50
Low temperature brittleness, °Minus 20Minus 22/22
Flashpoint °300285/283
Kinematic viscosity at 135°C, cSt498442/450
Dynamic viscosity at 60°; PA·268202/212
After the test according to method ASTM D 1754:

The change in mass after heating, wt.%0,09 0,05/0,05
Residual penetration,% of original value7977/76
The elongation at 25°cmMore than 150More 150/150
Kinematic viscosity at 135°C, cSt654541/550
Dynamic viscosity at 60°; PA·598444/450
*in the numerator the results of tests compounded bitumen obtained by mixing components a paddle stirrer, the denominator of the circulation pump.

Comparative analysis of the test results compounded bitumen obtained using different mixing devices, testifies to the identity of their properties, and consequently, about the possibility of using any mixing device, providing uniform distribution of the bituminous Converter in the mass of bitumen. Bitumen produced using bitumen Converter, characterized by a high viscosity that it is necessary to provide a high sdvigoustojchivosti road asphalt.

Example 2

Source components:

bitumen grade BDU 50/700 - of 92.5 wt.%;

bitumen Converter (kinematic viscosity at 50°S - 68 SS is) - 7.5 wt.%.

Method of preparation: bitumen Converter injected into molten at a temperature of 165°bitumen; the components are stirred at the same temperature for 20 minutes with a mechanical stirrer blade type (about 150 rpm).

Physico-mechanical properties of original and compounded bitumen are presented in table 2.

Table 2
Name of indicatorThe original bitumen, BDU 50/70Compounded bitumen grade BDU 100/130
The penetration depth of the needle  
25°S, 0.1 mm68128
Softening temperature, °4743

The elongation at 25°cmMore than 150More than 150
Low temperature brittleness, °Minus 20Minus 21
Flashpoint °300281
Kinematic viscosity at 135°C, cSt498334
After the test according to the method S D 1754:
The change in mass after PR is grave, wt.%0,090,05
The residual penetration  
% of initial value7977
The elongation at 25°0, cmMore than 150More than 150

Example 3

Source components:

bitumen grade BDUS 70/100 - 97.5 wt.%;

bitumen Converter (kinematic viscosity at 50°S - 68 cSt) - 2.5 wt.%.

Method of preparation: bitumen Converter injected into molten at a temperature of 165°bitumen; the components are stirred at the same temperature for 30 min circulation pump.

Physico-mechanical properties of original and compounded bitumen are presented in table 3.

Table 3
Name of indicatorThe original bitumen, BDUS 70/100Compounded bitumen grade BDUS 100/130*
The depth of needle penetration at 25°S, 0.1 mm91109/111
Softening temperature, °4544/43
The elongation at 25°cmMore 150/150More 150/150
Low temperature brittleness, ° Minus 19Minus 21/20
Flashpoint °290281/278
Kinematic viscosity at 135°C, cSt241207/155
Dynamic viscosity at 60°; PA·8379/54
After the test according to the method S D 1754:
the change in mass after heating, wt.%0,180,10/0,19

Residual penetration, % of original value7477/65
The elongation at 25°cm125142/130
Kinematic viscosity at 135°C, cSt326305/243
Dynamic viscosity at 60°; PA·159141/99
*- in the denominator presents the results of tests of marketable bitumen grade BDUS 100/130 obtained by traditional technology refinery.

Benchmarking quality marketable bitumen obtained by traditional technology, with bitumen obtained by compounding with bitumen Converter (table 3), suggests that, despite Odin the new values of penetration, bitumen obtained by the proposed method, characterized by a higher viscosity, and therefore, able to provide a higher sdvigoustojchivosti road asphalt.

Example 4

Source components:

bitumen grade BDU 70/100 - 93 wt.%,

bitumen Converter (kinematic viscosity at 50°C - 81 cSt) - 7 wt.%.

Method of preparation: bitumen Converter injected into molten at a temperature of 165°bitumen; the components are stirred at the same temperature for 20 minutes with a mechanical stirrer blade type (about 150 rpm).

Physico-mechanical properties of original and compounded bitumen are presented in table 4.

Table 4
Name of indicatorThe original bitumen, BDU 70/100Compounded bitumen grade BDU 130/200
The depth of needle penetration at 25°S, 0.1 mm79145
Softening temperature, °4742
The elongation at 25°cmMore than 150More than 150
Low temperature brittleness, °Minus 20Minus 21
Flashpoint°303 279
Kinematic viscosity at 135°C, cSt470335

After the test according to the method S D 1754:
The change in mass after heating, wt.%0,060,09
The residual penetration  
% of initial value7769
The elongation at 25°cmMore than 150More than 150
Kinematic viscosity at 135°C, cSt576431

Thus, the proposed method for obtaining bitumen allows for the preparation of road building materials to control how the value of penetration prepared bitumen, and other characteristics.

Method of production of road bitumen, including compounding trademarks of bitumen from the oil refining products, characterized in that the quality of the product refining use of bitumen Converter, which is previously obtained as an oil fraction of direct distillation of heavy allopurinol oil naphthenic base with a kinematic viscosity at 50°within 65-85 FTAs, and in the quality of the ve trademark use bitumen bitumen with a penetration at 25° With 0.1 mm not less than 68 and elongation at 25°With more than 150 cm in the following ratio, wt.%:

The above product

refining 2,5-7,5

The above commodity

bitumen 92,5-97,5



 

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