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A kind of dehydration method of heavy dirty oil

A technology for heavy dirty oil and dirty oil, which is applied in the fields of hydrocarbon oil dehydration, separation methods, chemical instruments and methods, etc., can solve the problems of insignificant difference in water-oil density and difficulty in using sedimentation and dehydration to return to refining.

Active Publication Date: 2021-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the density of a considerable part of heavy pollution is greater than that of water, and the density difference between water and oil is not obvious, so it is difficult to use the method of sedimentation and dehydration for re-refining

Method used

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  • A kind of dehydration method of heavy dirty oil
  • A kind of dehydration method of heavy dirty oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first-stage flash evaporation is adopted, and the heavy dirty oil is fed to the flash tower, the height of the feed port is 1 / 2 of the height of the flash tower, the aspect ratio of the flash tower is 40 / 3, and the flash condition is 0.45MPa ( G), 155~185°C, after the flash dehydration is completed, the dehydrated heavy dirty oil is obtained, and the water content of the heavy dirty oil is 10%m.

Embodiment 2

[0028] The first-stage flash evaporation is adopted, and the heavy dirty oil is fed to the flash tower. The height of the feed port is 5 / 16 of the height of the flash tower (feeding in the middle and upper part), and the flash evaporation condition is 0.45MPa (G), 155~185 °C, after the flash dehydration is completed, the dehydrated heavy dirty oil is obtained, and the water content of the heavy dirty oil is 8%m.

Embodiment 3

[0030] Using three-stage flash evaporation, the heavy dirty oil is fed to the first-stage flash tower, the height of the feed port is 5 / 16 of the height of the first-stage flash tower (feeding in the upper part), and the flash condition is 0.45MPa ( G), 160°C; the heavy dirty oil at the bottom of the tower obtained from the first-stage flash evaporation is sent to the second-stage flash tank after heat exchange, and the height of the feed port is 5 / 16 of the height of the second-stage flash tower (the middle and upper part of the feed ), the flashing condition is 0.43 MPa (G), 170°C; the second-stage flashing obtains the heavy dirty oil at the bottom of the tower after heat exchange and sends it to the third-stage flash tank, and the height of the feed port is the height of the third-stage flash tower The 5 / 16 (feeding in the middle and upper part), the flashing condition is 0.41MPa(G), 180℃. After the three-stage flash dehydration is completed, the water content in the obtain...

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Abstract

The invention discloses a method for dehydrating heavy dirty oil, which comprises the following contents: the heavy dirty oil is fed into a flash tower for flash dehydration treatment, sewage containing light oil is obtained at the top of the tower, and dehydrated heavy dirty oil is obtained at the bottom of the tower; The pressure of the flash dehydration treatment is 0.40~0.65MPaG, preferably 0.45~0.55MPaG. The flash dehydration treatment temperature of the flash tower is 155~200°C. The method of the present invention adopts the flashing treatment mode, effectively removes the water in the heavy dirty oil, and can be used as quenched oil for back refining or deep dehydration.

Description

technical field [0001] The invention relates to a method for dehydrating heavy dirty oil. Background technique [0002] The recovery and utilization of heavy dirty oil has always been a difficult point in the production and operation management of various refineries. The general treatment method in refineries is to settle and dehydrate heavy dirty oil, and then mix it into crude oil tanks or enter coking units as quenched oil for re-refining. However, the nature of crude oil is getting worse and worse, such as inferior heavy oil, whose density is generally between 0.95 and 0.97, and has the characteristics of high salt content, high asphaltene content, and low light oil content, which makes the operation of the electric desalting device difficult and eventually desalting The salt content of the final crude oil is as high as 8~15mg / L, and the oil content of the electro-desalted drainage is extremely high, which is also the main source of heavy dirty oil. This part of heavy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/04C10G7/12B01D17/02B01D17/022B01D17/04
CPCB01D17/02B01D17/0202B01D17/045C10G7/006C10G7/04C10G7/12C10G2300/4006C10G2300/4012
Inventor 卢秋旭王阳峰吴振华高宏义李明一
Owner CHINA PETROLEUM & CHEM CORP