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Absorption-stabilization technology and system for refining

An absorption stabilization system and stable technology, applied in the petroleum industry, gas mixture processing, hydrocarbon oil treatment, etc., can solve the problems of increasing the internal circulation of gasoline, the absorption of diesel oil can not be too large, and economic losses.

Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the distillation range of diesel oil in my country is 180°C to 360°C, and the final boiling point of gasoline is 205°C. Therefore, there is a problem that a certain amount of gasoline is entrained in diesel oil. Due to the low value of diesel oil, the value of gasoline is high, so low-value diesel oil Carrying some high-quality gasoline will undoubtedly cause certain economic losses
Due to the limitation of the heat balance of the fractionating tower, the amount of diesel absorbent should not be too large, so it is impossible to cancel the stable internal circulation of gasoline by increasing the amount of diesel absorbent

Method used

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Examples

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Embodiment 1

[0054] Taking the absorption stabilization system of a domestic 1 million tons / year FCC catalytic cracking unit as an example, the ASPEN PLUS process simulation software is used to simulate the process of the present invention, and catalytic diesel is used as the absorbent. The key process parameters are as follows: the outlet of the rich gas compressor The pressure is 1.4 Mpa, the operating temperature of the desorption gas balance tank is 40 ℃, the absorption tower bottom liquid entering the desorption gas balance tank accounts for 40wt% of the total liquid phase output at the bottom of the absorption tower, the operating temperature of the rich gas balance tank is 40 ℃, and the rich gas Equilibrium tank liquid phase heat exchange to 80 ℃ enters the dividing wall tower, the absorption tower is equipped with an intercooler, the return tower temperature is 35 ℃, and the amount of fresh catalytic diesel oil is 30 t / h (initial boiling point 180 ℃, final boiling point 360 ℃) , the...

Embodiment 2

[0056] Same as Example 1, the difference is that a mixture of 1-butyl-3-methylimidazolium hexafluoroborate and sodium acetate (wherein sodium acetate is 5wt%) is used as the absorbent, and the process parameters are as follows: rich gas compression The outlet pressure of the machine is 1.4 Mpa, the operating temperature of the desorption gas balance tank is 40°C, the absorption tower bottom liquid entering the desorption gas balance tank accounts for 40wt% of the total liquid phase output at the bottom of the absorption tower, and the operating temperature of the rich gas balance tank is 40°C. The rich gas balance tank is liquid-phase heat exchanged to 80°C and enters the desorption tower. The absorption tower is equipped with an intercooler. The return temperature of the tower is 35°C, the internal circulation of the absorbent is 40 t / h, the vacuum degree of the regeneration tank is 15 Kpa, and the dry gas output is 5 t / h, the output of liquefied gas is 29 t / h, and the output...

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Abstract

The invention provides an absorption-stabilization technology and system for refining. The absorption-stabilization system comprises a gas-liquid balance tank, a rich gas compressor, a rich gas balance tank, an absorption tower, a desorption-stabilization dividing wall tower, a re-absorption tower, a regeneration tank, a desorption gas balance tank and a vacuum pump. The invention further provides the absorption-stabilization technology utilizing the absorption-stabilization system. By adopting the absorption-stabilization technology and system, provided by the invention, the concentration of liquefied gas in dry gas is greatly reduced; and meanwhile, the yield of catalytic gasoline and the liquefied gas can be improved and the energy consumption of the system is greatly reduced.

Description

technical field [0001] The invention relates to the petroleum refining industry, in particular to a process and a system for stabilizing the absorption of devices such as catalytic cracking and delayed coking. Background technique [0002] The absorption stabilization system is the post-treatment process of the catalytic cracking unit and the delayed coking unit in the petroleum refining industry. Its purpose is to use the principle of absorption and rectification to separate the rich gas and naphtha in the oil-gas separation tank at the top of the fractionation tower into dry gas ( C 2 Below), liquefied petroleum gas (C 3 、C 4 ) and stable gasoline with qualified vapor pressure. The optimization of the unit and process flow of the absorption stabilization system plays a very important role in the energy saving and efficiency enhancement of catalytic cracking and delayed coking units. [0003] At present, the absorption-stabilization process flow of most refineries is: t...

Claims

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Application Information

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IPC IPC(8): C10G70/04C10G70/06
CPCC10G70/04C10G70/06
Inventor 张伟薄德臣张英陈建兵张龙
Owner CHINA PETROLEUM & CHEM CORP
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