Heavy oil viscosity breaking method based on super-critical benzene and application thereof

A visbreaking and supercritical technology, applied in the petroleum industry, refining hydrocarbon oil, etc., which can solve the problems of low visbreaking efficiency, rising, quenching of alkyl carbon radicals, etc.

Active Publication Date: 2018-07-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, when the visbreaking is carried out at a lower temperature, the alkyl carbon radicals initiating the reaction network are easily quenched due to the in-situ coupling of high-viscosity constraints, which directly leads to low visbreaking efficiency
When the reaction temperature is increased to improve the visbreaking efficiency, the content of asphaltene in the system will increase due to the fact that the apparent activation energy of condensation is much higher than the corresponding value of dealkylation, resulting in a decrease in the stability of the product
The inherent constraint of high viscosity on cracking kinetics makes it impossible to strike a balance between visbreaking efficiency and product stability in conventional visbreaking controlled by reaction temperature and residence time

Method used

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  • Heavy oil viscosity breaking method based on super-critical benzene and application thereof
  • Heavy oil viscosity breaking method based on super-critical benzene and application thereof
  • Heavy oil viscosity breaking method based on super-critical benzene and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Visbreaking in supercritical benzene environment:

[0040] Add 10 g of raw material heavy oil (properties as shown in Table 1) and 30 g of benzene into a high-pressure reactor with a capacity of 100 mL. The feeding conditions correspond to a benzene-oil ratio of 3:1 and a supercritical benzene density of 0.30 g / cm 3 ;

[0041] With high purity N 2 After purging for 10 minutes, the closed reactor was heated from room temperature at a rate of 15°C / min, and the stirring rate was maintained at 700rpm during the process;

[0042] Start timing after reaching the specified temperature of 360°C;

[0043] After completing the predetermined time reaction, the cracking is terminated by air-cooling the reactor body.

[0044] N 2 Traditional visbreaking control experiments in ambient conditions:

[0045] Add 30g of raw material oil in a high-pressure reactor with a capacity of 100mL;

[0046] After high-purity N 2 Filled with 8.0-9.0MPa high-purity N after purging 2 ;

[0047...

Embodiment 2

[0061] Visbreaking of heavy oil in supercritical benzene environment:

[0062] Add 8.8g of feedstock oil and 35g of benzene to a 100mL autoclave, corresponding to a benzene-oil ratio of 4:1 and a supercritical benzene density of 0.35g / cm 3 ;

[0063] With high purity N 2 After purging for 10 minutes, the closed reactor was heated from room temperature at a rate of 15°C / min, and the stirring rate was maintained at 700rpm during the process;

[0064] After reaching the specified temperature of 400°C, the cracking is terminated by air-cooling the reactor body.

[0065] N 2 Traditional visbreaking control experiments in ambient conditions:

[0066] Add 30g of raw material oil in a high-pressure reactor with a capacity of 100mL;

[0067] After high-purity N 2 Filled with 8.0-9.0MPa high-purity N after purging 2 ;

[0068] The closed reactor starts heating at a rate of 15°C / min from normal temperature, and the stirring rate is kept at 700rpm during the process;

[0069] Sta...

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Abstract

The invention relates to a heavy oil viscosity breaking method based on super-critical benzene. The heavy oil viscosity breaking method comprises the following steps: putting heavy oil into a super-critical benzene environment with a specific thermodynamic state (including the temperature of 360 to 400 DEG C and the density of 0.25 to 0.35g / cm<3>) and transferring viscosity breaking of the heavy oil from a high-viscosity oil phase to a super-critical benzene phase; improving and accelerating arene dealkylation, which influences heavy oil viscosity breaking efficiency, through diffusing; according to series macroscopic topological structure characteristics of the arene dealkylation and arene condensation in a heavy oil viscosity breaking process, synchronously preventing secondary arene condensation in a viscosity breaking process through acceleration on the arene dealkylation under a series reaction framework and inhibition of a super-critical benzene medium on arene supramolecular coke aggregation. By adopting the heavy oil viscosity breaking method based on the super-critical benzene, provided by the invention, the viscosity breaking of the heavy oil can be finished at relativelylow reaction temperature and within relatively short staying time; efficient viscosity breaking is realized in the process under the condition that raw material group composition basically keeps unchanged and coking is not caused.

Description

technical field [0001] The invention relates to the technical field of heavy oil treatment, in particular to visbreaking of heavy oil, in particular to a visbreaking method of heavy oil based on supercritical benzene solvent. Background technique [0002] Unconventional heavy crude oil (API value <20°) has accounted for 53% of the global crude oil reserves, and the crude oil must be visbroken before being transported to the refinery by pipeline or ship. The continuous decline of crude oil quality has led to atmospheric and vacuum residue reaching 45-55wt% of the crude oil processing capacity of Chinese refineries, and visbreaking is also required before converting part of the vacuum residue into fuel oil. Visbreaking, which belongs to thermal processing, has become an important (or even the only) optional processing scheme when visbreaking low-quality heavy oil represented by super-heavy crude oil and vacuum residue. [0003] Visbreaking involves dealkylation and condens...

Claims

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Application Information

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IPC IPC(8): C10G21/14
CPCC10G21/14
Inventor 袁佩青李艳
Owner EAST CHINA UNIV OF SCI & TECH
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