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Combined technological method for heavy oil modification

A combined process and heavy oil upgrading technology, used in the petroleum industry, hydrocarbon oil cracking and other directions, can solve the problem of high coking rate, and achieve the effect of enhancing the reaction effect, reducing the coking tendency and improving the reaction effect.

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the thermal cracking reaction is carried out in supercritical water, the coking side reaction is reduced compared with the ordinary thermal cracking process, but the coking rate is still high for inferior raw materials

Method used

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  • Combined technological method for heavy oil modification
  • Combined technological method for heavy oil modification
  • Combined technological method for heavy oil modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment -1

[0022] After the Tahe residual oil is treated with the same filtration as the conventional process, add 200 μg / g of water-soluble or oil-soluble multi-metal catalyst (using Ni-containing salt and Mo-containing salt as raw materials, the atomic ratio of the two metals is 1:3) The solution is subjected to suspension bed hydrocracking, and the suspension bed hydrocracking is carried out. The conditions are conventional process operating conditions, temperature: 390°C, pressure 15MPa, space velocity 1.0h -1 , the ratio of hydrogen to oil is 600:1, and the conversion rate of the suspension-bed hydrocracking is 62%. The suspension-bed hydrocracking can operate stably for a long period at this low conversion rate.

[0023] The unconverted tail oil of suspension bed hydrocracking is then subjected to supercritical treatment, and tetralin is added to the static mixer, (keep excess tetralin, the weight ratio of heavy oil to tetralin is 1:6) , and then after the material is heated, it en...

Embodiment -2

[0025] Using Tahe residual oil as raw material, the suspension bed hydrocracking steps are the same as in Example-1, the reaction temperature is controlled at 405°C, and the conversion rate is 74%. Suspension bed hydrocracking can operate stably for a long period at this conversion rate. Suspension-bed hydrocracking unconverted tail oil is subjected to supercritical treatment, the hydrogen-donating solvent is decahydronaphthalene, the weight ratio of Tahe residual oil to hydrogen-donating solvent is 1:2, the reaction pressure is 35MPa, the reaction temperature is 450°C, and the reaction time is For 2.5h (CSTR is continuous feeding and discharging, and the reaction time is the average residence time of the material). After being processed by the method of the present invention, the reaction results are shown in Table 2.

Embodiment -3

[0027] By the same method of embodiment 2, water is also added when using decahydronaphthalene, and the weight ratio of water and supercritical treatment feed is 1: 1, and reaction result is shown in Table 2.

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Abstract

The invention discloses a combined technological method for heavy oil modification, which comprises the following steps: carrying out suspension bed hydrogen cracking on heavy oil raw material under a suspension bed hydrogen cracking condition; separating reactor effluent of the suspension bed hydrogen cracking step; mixing the unconverted tail oil of the suspension bed hydrogen cracking step with a hydrogen-donor solvent and carrying out supercritical treatment, wherein the hydrogen-donor solvent comprises tetrahydronaphthalene or decahydronaphthalene, and the supercritical treatment conditions are as follows: the pressure is 15-40MPa, the temperature is 300-500 DEG C, and the treating time is 0.2-5 hours; and carrying out fractionation treatment after solid impurities are separated fromthe treated product. The combined process for heavy oil modification of the invention organically combines the suspension bed hydrogen cracking and the supercritical treatment, gives full play to theadvantages of the two technologies, achieves the synergic coordination effect, reduces coking tendency, simultaneously enhances the reaction effect, improves the impurity removal capacity, improves the operational stability of the suspension bed hydrogen cracking, and can treat more inferior raw materials.

Description

technical field [0001] The invention relates to a combined process for upgrading heavy oil, in particular to a combined process for upgrading inferior heavy oil. Background technique [0002] At present, due to the depletion of oil resources and the increasing demand for oil due to economic development, the price of oil has risen rapidly. Moreover, as crude oil resources become heavier, in the refining process of petroleum, the yield of residual oil is relatively high, generally 40% to 50%. In addition, there are many heavy crude oils in the crude oil reserves in the world, most of which are residues, and they are low-quality residues with high impurity content. [0003] The currently industrialized methods for treating these residual oils or heavy oils include: catalytic cracking, residual oil hydrogenation, delayed coking, visbreaking, solvent deasphalting and other methods or combined methods. As the residual oil becomes more and more inferior, and the content of sulfur...

Claims

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Application Information

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IPC IPC(8): C10G47/26C10G47/02
Inventor 刘建锟杨涛贾丽胡长禄蒋立敬陈涛
Owner CHINA PETROLEUM & CHEM CORP
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