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Propane deasphalting method for paraffin-based vacuum residuum with low needle penetration

A technology of vacuum residue and penetration, which is applied in the direction of selective extraction and processing of tar pitch/petroleum pitch/natural pitch, etc., which can solve the problem of unsmooth discharge of deoiled asphalt, the inability to achieve safe and stable production of the device, and the temperature of the extraction tower. problems such as small gradients, to achieve the effect of being beneficial to extraction and separation, improving mass transfer and separation effect, and improving mass transfer effect

Inactive Publication Date: 2017-12-29
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since 2005, when the equipment was used for trial processing of paraffin-based residue oils such as Xijiang, Panyu, Huizhou, and Nile, there have been accidents such as clogging of heating furnace tubes, extraction tower packing, etc., miscible phases in the extraction system, and large fluctuations in process operating parameters.
The operation risk is high, and the safe and stable production of the device cannot be realized
On April 16, 2006, the processing of Weizhou-Berlanac mixed slag also had low yield of asphalt, high yield of medium and light detachment, and poor fluidity of asphalt.
[0007] 3) higher freezing point;
[0009] 5) The adjustable temperature gradient in the extraction tower is very small, and the temperature range is very narrow;
[0011] 7) Too much deasphalted oil is discharged (deasphalted oil refers to light deoiling and medium deoiling);
[0012] 8) The discharge of deoiled asphalt is not smooth

Method used

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  • Propane deasphalting method for paraffin-based vacuum residuum with low needle penetration
  • Propane deasphalting method for paraffin-based vacuum residuum with low needle penetration
  • Propane deasphalting method for paraffin-based vacuum residuum with low needle penetration

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Experimental program
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Effect test

Embodiment 1

[0026] During the production of Xijiang vacuum residue oil, phase miscibility occurs, and the material is extremely unbalanced. For this reason, Xijiang vacuum residue and Shaqing vacuum residue were blended at a ratio of 7:3 and 1:1 respectively for propane deasphalting. The main properties of Xijiang vacuum residue oil and Shaqing vacuum residue oil blended in different proportions are shown in Table 1. The test conditions and results are shown in Table 2.

[0027] Table 1 Properties of Shaqing-Xijiang blend residue

[0028]

[0029] It can be seen from Table 1 that the properties of the blended vacuum residue have changed significantly. After blending, the penetration increases, the saturated hydrocarbon content decreases, the freezing point decreases, and the rotational viscosity increases. After the penetration is increased, the temperature gradient in the extraction tower can be increased; at the same time, the solvent-oil ratio can be increased, the selectivity of...

Embodiment 2

[0035] During the production of Xijiang vacuum residue oil, phase miscibility occurs, and the material is extremely unbalanced. For this purpose, the propane deasphalting was carried out by blending Xijiang vacuum residue and Iran Rawan vacuum residue at a ratio of 1:1. The main properties of Xijiang vacuum residue oil blended with Iran Rawan vacuum residue oil in different proportions are shown in Table 3. The test conditions and results are shown in Table 4.

[0036] Table 3 Properties of Iran Ravan-Xijiang vacuum residue after blending (1:1)

[0037]

[0038] Table 4 Pilot test conditions and results of blended residual oil (Iran Ravan-Xijiang vacuum residual oil = 1:1)

[0039]

[0040] It can be seen from Table 4 that after upgrading, the extraction and separation can be improved by adjusting the temperature gradient and solvent-oil ratio. That is to say, black oil no longer comes out from the top of the tower, and the yield of light deoiling is obviously increas...

Embodiment 3

[0042] The penetration of paraffin-based Huizhou vacuum residue is less than 200 0.1mm. In view of the fact that the yield of deoiled asphalt in the propane pilot test is very low or no output, it is decided to use other residual oil for the pilot test. According to the oil sources processed by the company, oil sources with higher asphalt yields are selected for blending. The yield of intermediate-based Aesop vacuum residue bitumen processed by the propane production unit (abbreviated as Aesop) is as high as 60%, and the yield of light deoiling is as low as 9%. Therefore, it was decided to blend Iraqi heavy Solus vacuum residue oil at a ratio of 1:1. The blended properties of the two vacuum residues are shown in Table 3. It can be seen from Table 3 that after mixing the two vacuum residues at a ratio of 1:1, the penetration, softening point, freezing point and 80°C rotational viscosity of the mixed vacuum residue all changed. The test conditions and results are shown in Tab...

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Abstract

The invention discloses a propane deasphalting method for paraffin-based vacuum residuum with low needle penetration. The paraffin-based vacuum residuum with needle penetration lower than 200 / 0.1 mm and intermediate-based vacuum residuum with needle penetration higher than 200 / 0.1 mm are mixed in a molten state and fed into a propane deasphalting device for propane deasphalting treatment, so that deasphalted oil and deoiled asphalt are separated out. According to the method, the paraffin-based vacuum residuum with low needle penetration is modified, so that mixed phase does not appear in an extraction tower during extraction treatment, the deasphalted oil and the deoiled asphalt are separated effectively, and pipeline blocking and other phenomena cannot be caused.

Description

technical field [0001] The invention relates to a method for propane deasphalting of residue oil, in particular to a method for propane deasphalting of low-penetration paraffin-based vacuum residue. Background technique [0002] Solvent deasphalting treatment process is a common process method for the raw material source of lubricating oil and road asphalt production. It separates the materials according to the solubility of different components in the solvent. Maoming Petrochemical's propane deasphalting unit has an annual production capacity of 400,000 tons. The yield of bitumen is 50±5%, the yield of mid-stage oil is 25±5%, and the yield of light deoiling is 25±5%. The yield of each material is safe within the design capacity, otherwise it will bring unsafe factors to the normal operation of the device. The device was originally designed to process Daqing (high-quality paraffin-based) residual oil, which is mainly used to produce heavy lubricating oil raw materials. Fr...

Claims

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Application Information

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IPC IPC(8): C10C3/08
CPCC10C3/08
Inventor 杨海兰骆新平卢振旭欧晔何靖斌许宏苏亦平梁胡谢正良孙望平
Owner CHINA PETROLEUM & CHEM CORP
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