Road Bitumen Composition With Hydrocracking Residue For Oxidative Aging
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Solution Overview
Problem
The challenge is to develop a road bitumen composition using residual products from hydrocracking of heavy oil residual feedstock that maintains or improves performance characteristics such as change of mass after aging, shear resistance, fatigue resistance, and cold resistance, while being environmentally friendly and resource-efficient.
Innovation Solution
A road bitumen composition is formulated using oxidized bitumen, tar, and a residual product from hydrocracking of heavy oil residual feedstock, with specific weight ratios and additives like styrene-butadiene copolymer and plasticizer, processed through an oxidation and mixing method to achieve desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If residual products from hydrocracking of heavy oil residual feedstock are used in road bitumen composition, then resource efficiency is improved and environmental impact is reduced, but oxidative aging resistance deteriorates due to high reactivity with oxidative polycondensation processes
Solution Approach 1:
A styrene-butadiene-styrene (SBS) block copolymer is introduced as an intermediary substance that mediates between the reactive hydrocracking residue and the oxidation environment. The SBS copolymer forms a protective network structure that reduces the direct exposure of reactive asphaltene components to oxidative conditions, thereby slowing oxidative polycondensation while still allowing the beneficial use of hydrocracking residue in the bitumen composition.
Solution Approach 2:
The invention creates a composite bitumen material combining oxidized bitumen (60-75 wt%), tar (25-40 wt%), and a small amount of SBS block copolymer (0.1-5 wt%). This composite structure leverages the binding properties of oxidized bitumen, the flexibility and adhesive properties of tar, and the protective network-forming capability of SBS copolymer to create a material that utilizes hydrocracking residue while resisting oxidative aging.
2Reliability
If new stricter GOST standards with PG labelling are implemented, then road safety and performance are improved, but manufacturing complexity increases due to additional rheological property requirements
Solution Approach 1:
The invention systematically adjusts key compositional parameters (oxidized bitumen content: 60-75 wt%, tar content: 25-40 wt%, SBS copolymer content: 0.1-5 wt%) to achieve compliance with different PG (Performance Grade) specifications. By controlling these parameters within specified ranges, the bitumen composition can be tailored to meet various rheological requirements (viscosity, elasticity, temperature susceptibility) while maintaining a relatively simple two-component mixing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively utilizes hydrocracking residue without adversely affecting performance, meeting stringent GOST standards for road construction and maintenance, and reducing environmental impact.
Implementation Method 1
residual products from hydrocracking of heavy oil residual feedstock are highly reactive with respect to oxidative polycondensation processes
Implementation Method 2
oxidized bitumen, which is a product of oxidation of a mixture of tar and a residual product from hydrocracking of heavy oil residual feedstock
Data Source
AI summary
The invention relates to road bitumen compositions (variants) and a preparation method of a road bitumen composition. According to the first embodiment, the road bitumen composition comprises oxidized bitumen and tar, wherein the oxidized bitumen is a product of oxidation of a mixture of tar and a residual product from hydrocracking of heavy oil residual feedstock. According to the second embodiment, the road bitumen composition comprises the composition according to the first embodiment, a residual product from hydrocracking of heavy oil residual feedstock, a plasticizer, and a styrene-butadiene copolymer. The method of preparing the road bitumen composition comprises mixing tar and a residual product from hydrocracking of heavy oil residual feedstock to obtain a mixture of tar and the residual product from hydrocracking of heavy oil residual feedstock, oxidizing the obtained mixture in an oxidation plant to obtain oxidized bitumen, mixing the obtained oxidized bitumen with tar to produce a first bitumen composition, and mixing the first bitumen composition with the plasticizer, the residual product from hydrocracking of heavy oil residual feedstock, and the styrene-butadiene copolymer to produce a road bitumen composition. The technical result achievable by this invention is the provision of a road bitumen composition in which a residual product from hydrocracking of heavy oil residual feedstock is used and requisite performance characteristics of the road bitumen composition for use in road construction and maintenance are retained, said characteristics including, but not limited to, proper characteristics of change of mass after aging, shear resistance, fatigue resistance, and cold resistance.