Atmospheric vacuum distillation process for light crude oil

A technology of atmospheric and vacuum distillation and light crude oil, applied in hydrocarbon distillation, petroleum industry, vacuum distillation, etc., can solve the problems of ineffective fractionation of light crude oil, meet the requirements of long-term operation and save investment

Inactive Publication Date: 2012-07-18
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to provide an improved crude oil atmospheric and vacuum distillation process for the existing crude oil atmospheric and vacuum distillation process which cannot effectively fractionate light crude oil. But it has quite good atmospheric column fractionation effect of light crude oil

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  • Atmospheric vacuum distillation process for light crude oil
  • Atmospheric vacuum distillation process for light crude oil
  • Atmospheric vacuum distillation process for light crude oil

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Embodiment 1

[0023] Oman, Saudi Arabia, and Iran are 1:1:1 (mass ratio). The blended crude oil has an API degree of 32.8, a distillate yield of 54.2% before 360°C, and a higher fraction content of the mixed crude oil at 200-400°C. The mixed crude oil is treated with secondary desalting. Such as figure 1 As shown, the mixed crude oil 1 after secondary desalination enters the primary distillation tower 2 after heat exchange. The specification of the initial distillation column is φ3800×12 / 14×40472. The plate spacing is 0.6m, and the technical specifications of the trays are shown in Table 1. The operating conditions of the initial distillation tower are shown in Table 2. The pressure at the top of the primary distillation tower is 0.225MPa, and the temperature of the top condenser is 60°C. The overhead reflux device extracts the initial distillation overhead water 3 and the initial distillation overhead product 4 . The distillate from the side line 5 of the primary distillation column ...

Embodiment 2

[0044] During the initial distillation process, the feed temperature of the initial distillation tower was controlled at 235°C. The pressure at the top of the primary distillation tower is 0.229MPa, and the temperature of the discharge at the top of the tower is 163°C. The initial sideline temperature was 181°C. During the atmospheric distillation process, the temperature of the crude oil entering the atmospheric tower is 355°C, and the pressure at the top of the atmospheric tower is 0.12MPa. Usually the first-line reboiler load is controlled within the range of 2.1MMkal / hr. Usually the second-line stripping steam volume is controlled at 525Kg / hr. The heat extraction ratio of the atmospheric tower is the top of the tower: the top circulation: the first middle: the second middle is equal to 1: 2.5: 4.2: 5.2. During the vacuum distillation process, the pressure at the top of the vacuum tower is 55mmHg, and the plate pressure drop is 0.27KPa. Other equipment and conditions ar...

Embodiment 3

[0047] The mixed crude oil is: Oman and Saudi Arabia are mixed at a ratio of 1:3 (mass ratio), and the distillate yield before 360°C is 58%. During the initial distillation process, the feed temperature of the initial distillation tower was controlled at 247°C. The pressure at the top of the primary distillation tower is 0.227MPa, and the temperature of the discharge at the top of the tower is 160°C. The initial sideline temperature was 178°C. During the atmospheric distillation process, the temperature of the crude oil entering the atmospheric tower is 352°C, and the pressure at the top of the atmospheric tower is 0.16MPa. Usually the first-line reboiler load is controlled within the range of 1.8MMkal / hr. Usually the second-line stripping steam volume is controlled at 550Kg / hr, and the normal second-line stripping steam volume is controlled at 550Kg / hr. The heat extraction ratio of the atmospheric tower is the top of the tower: the top circulation: the first middle: the se...

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Abstract

The invention discloses a process for performing normal vacuum distillation on light crude oil, which comprises the step of cutting the light crude oil into various oil distillates after forerunning, atmospheric distillation and vacuum distillation, wherein in the forerunning process, the feed temperature of a primary tower is controlled between 235 and 247 DEG C; and in the atmospheric distillation, the load of a normal primary reboiler is controlled between 1.8 and 2.1 MMkal / hr, the secondary steam stripping steam quantity is controlled between 525 and 575 Kg / hr, and the heat removal ratio of the tower top to the top circulation to the first middle part to the second middle part of an atmospheric column is equal to 1:2.2-2.5:3.2-4.2 : 4.6-5.2. The process can meet the requirements on processing the mixed raw oil containing a lot of light oil, in particular the mixed raw oil of which the yield of distillate oil is not less than 52 percent of that of the light oil before the temperature reaches 360 DEG C. The upper separation effect of the atmospheric column becomes good, and the quality of the main product is guaranteed. The processing quantity of the crude oil can reach 7.50 to 8.50 million tons per year, the yield of naphtha is not less than 1.00 million ton per year, and the yield of wax is at least 0.18 million ton per year. The main devices are not changed to save the investment greatly. In the process of adjustment, the work is not necessary to be stopped so that the process has the characteristic of easy operation, and can meet the requirement on long period of running.

Description

technical field [0001] The invention belongs to the field of crude oil refining, in particular to an atmospheric and vacuum distillation process of light crude oil. Background technique [0002] Atmospheric and vacuum distillation is the first process of petroleum refining. The atmospheric and vacuum distillation process of the existing fuel-lubricating oil refinery is generally as follows. Crude oil is desalted in two stages. Distillation adopts mature three-stage distillation (ie pre-vaporization, atmospheric distillation and vacuum distillation) method. The main equipment used in the pre-gasification process is the initial distillation column. In order to recover the light hydrocarbons in the crude oil, the initial distillation column adopts a method of properly raising the pressure to dissolve the light hydrocarbons in the initial top oil, and then recover the light hydrocarbons through the stabilizing part. The primary distillation tower is provided with the first l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/00C10G7/06
Inventor 李少萍徐心茹杨敬一张蓓蕾丁烙勇张丽娟
Owner EAST CHINA UNIV OF SCI & TECH
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