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Method for preparing light oil from supercritical water modified vacuum residuum

A vacuum residue and light oil technology, applied in the petroleum industry, cracking, non-catalytic thermal cracking, etc., can solve the problems of reducing economic competitiveness, troubles, development restrictions, etc., and achieve the effect of saving external heat sources

Inactive Publication Date: 2007-11-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of heavy solvent deasphalting is that a part of hard asphalt is produced by-product, and its outlet has not been solved well, so the development of this technology is limited to a certain extent
[0015] Regarding the application of supercritical technology in energy, Chinese patent CN 00110054.8 discloses a method for catalytically treating full-fraction vacuum residue in a supercritical solvent. The solvents include benzene, xylene, cyclopentane, and cyclohexane etc., does not contain supercritical water, no matter what kind of solvent is used compared with water, it has the disadvantage of high cost, which will directly increase the production cost and reduce the economic competitiveness of the process
And adding a catalyst, the production cost is high, and it will also bring troubles for post-processing
[0016] Chinese patent CN 00110055.6 discloses a method for thermal cracking of residual oil in a supercritical solvent, which includes benzene, xylene, cyclopentane, cyclohexane, etc., does not include supercritical water, and the solvent and residual oil The weight ratio is 2.0 to 3.0, too many solvents are used, and no matter what kind of solvent is used, compared with water, the cost is too high, which will directly increase the production cost and reduce the economic competitiveness of the process.
The reaction pressure is only 8-10MPa, which will increase the amount of gas generated
In addition, the solvent will also participate in the cracking reaction, which will increase the consumption
[0017] Chinese patent CN 00123222.3 discloses a method for treating residual oil by catalytic hydrogenation in a suspended bed. Due to the use of hydrogen, the production cost is relatively high, and the reaction energy consumption for generating hydrogen is huge
In addition, there are some insurmountable problems in the addition, consumption and separation of catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 75g of vacuum residue and 150g of deionized water into a 1-liter autoclave with a stirring device, without replacing the air in the autoclave, heat up to 420°C after sealing, and the pressure at this time is 25MPa. After maintaining the temperature for 1 hour, feed cooling water through the cooling coil in the kettle to cool the material to room temperature, and take out the material. The residue was washed with n-heptane, and after the solvent was recovered by rotary evaporation, it was combined with the material. The content of light components is simply expressed as 77.01% by the weight loss before 350°C of thermogravimetric, which is basically reasonable through the test of simulated distillation. Through the four-component analysis, it can be seen that a large amount of saturated components are generated, and the coke content is reduced. From the molecular weight inspection, it can be seen that the weight reduction is obvious, and it also has the functions of ...

Embodiment 2

[0039]Put 1g of vacuum residue and 1g of deionized water into a static tubular reactor with a volume of 10ml, purge with nitrogen, replace the air in the reactor, seal the reactor, put the reactor into the reactor that has been heated to In the molten salt at 460°C, the temperature control accuracy is ±0.2°C, and the temperature is controlled for 2 hours. The reactor was taken out and quenched in a water tank, the liquid phase oil in the reactor was taken out, and the reactor was cleaned with n-heptane until it was completely combined and then analyzed.

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Abstract

The process of preparing light oil with vacuum residue includes the following steps: feeding vacuum residue and water into one high pressure reactor with stirrer, heating to 380-460 deg.c in the presence of gaseous medium, maintaining for 24-60 min, and cooling to obtain light oil. Or, the process includes the following steps: feeding vacuum residue and water into one static tubular reactor with gaseous medium, setting the reactor inside a molten salt furnace at 420-460 deg.c, maintaining for 5-120 min, quenching in one water tank, taking out the liquid phase oil part from the reactor, washing the reactor with n-heptane, and merging to obtain the light oil. The process of preparing light oil with vacuum residue has also effects of desulfurizing, and eliminating nitrogen and metal, and produces no waste gas.

Description

technical field [0001] The invention relates to a method for preparing light oil, in particular to a method for preparing light oil from vacuum residue. Background technique [0002] At present, due to the depletion of oil resources and the demand for oil for economic development, the price of oil has risen rapidly. In the refining process of petroleum, the yield of vacuum residue is relatively high, generally 40-50%. This part of the vacuum residue is not currently used in industrial applications, and most of it is burned as fuel, and in order to have the necessary viscosity during the combustion process, a lot of light oil must be mixed. Therefore, upgrading the vacuum residue to produce light oil can on the one hand utilize a large amount of residual oil that is difficult to use more effectively, and on the other hand can produce more light oil to alleviate the increasing demand for light oil in social development. [0003] Industrialized methods for treating heavy oil ...

Claims

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Application Information

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IPC IPC(8): C10G9/06
Inventor 丁勇赵立群程振民袁佩青袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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