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A method and system for dehydrating and refining aged oil

A refining method, a technology for aging oil, applied in the direction of using waste oil refining, chemical dehydration/demulsification, refining hydrocarbon oil, etc., can solve the problems of increased burden on enterprises, high operating costs, limited application, etc., and achieve short residence time. , the effect of reducing the extraction dose and reducing the processing cost

Active Publication Date: 2020-05-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the dehydration methods of aging oil at home and abroad mainly include electric dehydration, chemical demulsification, ultrasonic demulsification, heat treatment and primary extraction (the extraction agent generally uses light petroleum fractions such as n-hexane, petroleum ether, gasoline and diesel oil), etc. Some of the above methods are as follows: The quality of the oil after electro-demulsification and chemical demulsification is poor. Although most of the water is removed, most of the inorganic matter is left in the oil; some methods have high operating costs, which increase the burden on the enterprise and limit the further application of the technology

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  • A method and system for dehydrating and refining aged oil
  • A method and system for dehydrating and refining aged oil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment provides a kind of aging oil dehydration refining method (flow process is as follows figure 1 shown).

[0057] The system used is summarized as follows:

[0058] The primary extraction unit, the primary extraction unit includes a primary extractor, a primary solid-liquid separator (sedimentation separation tank), a primary extractant recovery device (low temperature distillation device), a primary oil-water separator and a primary recovery oil storage device; the outlet of the primary extractor communicates with the inlet of the primary solid-liquid separator, the liquid phase outlet of the primary solid-liquid separator communicates with the first extraction agent recovery device, and the solid phase outlet of the primary solid-liquid separator leads to Subsequent secondary extraction unit; the extractant pipeline of the first extractant recovery device is communicated with the first-stage extractor, and the residual liquid pipeline of the first extrac...

Embodiment 2

[0081] Technical process is identical with embodiment 1, and the process parameter of change mainly is:

[0082] (1) primary extraction

[0083] The metered aged oil is transported to the primary extractor by a pump, and the first extractant is added in proportion. The dosage ratio is 5:1, and the first extractant is a compound of ether and methanol, and the volume ratio of the two is 2:1 in liquid state;

[0084] (2) Secondary extraction

[0085] The primary extraction residue is sent to the secondary extractor with a screw propeller, the second extraction agent is added, the temperature is controlled at 80°C, the reactor pressure is normal pressure, the stirring residence time is 30 minutes, the amount of the second extraction agent and the primary extraction residue The ratio is 3:1, the second extractant is polycyclic aromatic hydrocarbon extract of coal tar, mainly 2-5 ring polycyclic aromatic hydrocarbons, liquid at room temperature, density 0.9-1.2g / cm 3 ;

[0086] ...

Embodiment 3

[0088] Technical process is identical with embodiment 1, and the process parameter of change mainly is:

[0089] (1) One extraction

[0090] The metered aged oil is transported to the primary extractor by a pump, and the first extractant is added in proportion. The dosage ratio is 3:1, the first extractant is the compound of ether and ethanol, and the volume ratio of the two is 3:1 during the liquid state;

[0091] (2) Secondary extraction

[0092] The primary extraction residue is sent to the secondary extractor with a screw propeller, the second extraction agent is added, the temperature is controlled at 80°C, the reactor pressure is normal pressure, the stirring residence time is 30 minutes, the amount of the second extraction agent and the primary extraction residue The ratio is 3:1, the second extractant is polycyclic aromatic hydrocarbon extract of coal tar, mainly 2-5 ring polycyclic aromatic hydrocarbons, liquid at room temperature, density 0.9-1.2g / cm 3 ;

[0093]...

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Abstract

The invention provides a dehydration and refining method and system for aged oil. The dehydration and refining method comprises the following steps: (1) carrying out primary extraction on aged oil byusing a primary extractant, then carrying out solid-liquid separation to obtain a primary extraction liquor and a primary extraction residue, wherein the component of the primary extractant comprisesan oleophilic hydrophilic organic solvent with a boiling point of 100 DEG C or below; (2) recovering the primary extractant in the primary extraction liquor, carrying out oil-water separation on the residual liquid to obtain a first oil phase and a first aqueous phase; and (3) carrying out secondary extraction on the primary extraction residue by using a secondary extraction agent, and then carrying out solid-liquid separation to obtain a secondary extraction residue and a secondary extraction liquor containing a second oil phase, wherein the component of the secondary extractant comprises polycyclic aromatic hydrocarbon. The method has good dehydration effect, high crude oil recovery rate, short process time and high separation efficiency, and has obvious advantages compared with the prior art.

Description

technical field [0001] The invention belongs to the field of oil and gas field environmental protection, and in particular relates to a method for dehydrating and refining aged oil and a system thereof. Background technique [0002] Heavy oil aging oil is an oil-water mixture containing a small amount of inorganic impurities and a large amount of water recovered from heavy oil dehydration, processing, sewage and sludge treatment. It is oily and has poor fluidity at room temperature. multiphase dispersion system. Organic matter in aged oil is mainly heavy oil with high colloid and asphaltene content and surfactant added in heavy oil exploitation, transportation, oil-water separation and treatment, and sludge treatment. The specific gravity of recovered mineral oil is as high as 0.99g / cm 3 , The oil-water density difference is small. Fatty acid salts, naphthenates, and asphaltes in heavy oil are good emulsifiers, which aggravate the emulsification of aged oil, so the aged oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/00C10G21/28C10G33/04C10G53/16
CPCC10G21/006C10G21/28C10G33/04C10G53/16C10G2400/00
Inventor 仝坤宋启辉谢水祥王东任雯曾魏张明栋孙静文刘晓辉张哲娜
Owner BC P INC CHINA NAT PETROLEUM CORP
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