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Heavy oil visbreaking method based on supercritical water

A supercritical water and treatment method technology, which is applied in the treatment of hydrocarbon oil, petroleum industry, cracking, etc., can solve the problem of the stability of the reduced viscosity product, and achieve the effect of efficient viscosity reduction and excellent diffusion environment

Active Publication Date: 2017-07-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the condensation reaction is more easily promoted at high temperature, which reduces the stability of the visbroken product

Method used

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  • Heavy oil visbreaking method based on supercritical water
  • Heavy oil visbreaking method based on supercritical water
  • Heavy oil visbreaking method based on supercritical water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Viscosity reduction under SCW environment: add 10.0g raw material oil (properties as shown in Table 1) and 30g water (corresponding to water-oil ratio 3:1 and water density 0.30g / cm 3 ). With high purity N 2 After purging for 10 minutes, the closed reactor was heated from room temperature at a rate of 15 K / min, and the stirring rate was kept at 700 rpm during the process. Start timing after reaching the specified temperature of 663K. After the predetermined reaction time is reached, the cracking is terminated by air-cooling the reactor body.

[0035] N 2 Viscosity reduction control experiment under ambient conditions: Add 30 g of raw material oil into a high-pressure reactor with a capacity of 100 ml. After high-purity N 2 Filled with 8.0-9.0MPa high-purity N after purging 2 . The closed reactor was heated at a rate of 15K / min from normal temperature, and the stirring rate was kept at 700rpm during the process. Start timing when the temperature (663 or 693K) is ...

Embodiment 2

[0045] Visbreaking of heavy oil in SCW environment: Add 10g of raw oil and 20g of water into a high-pressure reactor with a capacity of 100ml (corresponding to a water-to-oil ratio of 2:1 and a water density of 0.2g / cm 3 ). With high purity N 2 After purging for 10 minutes, the closed reactor was heated from room temperature at a rate of 15 K / min, and the stirring rate was kept at 700 rpm during the process. Start timing after reaching the specified temperature of 693K. After the predetermined reaction time is reached, the cracking is terminated by air-cooling the reactor body.

[0046] N 2 See Example 1 for the viscosity-reducing control experiment in the environment.

[0047] Raw oil in SCW (temperature 693K, water-oil ratio 2:1, water density 0.20g / cm 3 ) Coke generation has been detected in the system during the reaction for 5 minutes. Therefore, when the preheating temperature reached 693K, the reaction was terminated immediately and a sample was taken as the viscos...

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Abstract

The invention relates to a heavy oil visbreaking method based on supercritical water, comprising: mixing heavy oil to supercritical water that is in preset thermodynamic state to form a mixed phase, allowing visbreaking cracking reaction of the heavy oil to be performed in the mixed phase, and through the disperse environment in the mixed phase and ability of the supercritical water to activate aromatic-side-chain olefin-terminated carbocations, performing the visbreaking cracking reaction of the heavy oil selectively toward dealkylation. In the method, the special oil-in-water or pseudo-homogeneous phase structure formed by SCW (supercritical water) and heavy oil is utilized to perform thermal cracking of heavy oil in the SCW. The excellent disperse environment provided by the SCW and the ability of the SCW to activate the aromatic-side-chain olefin-terminated carbocations help achieve the development of thermal cracking of the heavy oil not to condensation but to dealkylation. Efficient visbreaking of the heavy oil can be achieved at relatively low temperature within short retention time, and the broken product is applicable to pipeline transport or marine transport and to further deep processing.

Description

technical field [0001] The present invention relates to the technical field of heavy oil, in particular to heavy oil viscosity reduction, and specifically refers to a treatment method for heavy oil viscosity reduction based on supercritical water. Background technique [0002] With the rising global demand for fuel oil and the decline of light crude oil reserves, the exploitation, transportation, and deep processing of low-quality heavy oil are becoming increasingly important to world energy security, especially for China. By 2011, my country has become the world's second largest oil consumer and importer, and its dependence on crude oil imports exceeds 50%. In order to maintain the stable development of the national economy, my country signed an agreement with Venezuela in 2008, hoping to transport the country's heavy oil resources to China for processing. However, heavy oil generally has the characteristics of high sulfur nitrogen and nickel vanadium, high carbon residue ...

Claims

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Application Information

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IPC IPC(8): C10G9/00
CPCC10G9/007C10G2300/302
Inventor 袁佩青李艳刘军袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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