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Method for reducing propylene concentration of dry gas in catalytic cracking device absorption stabilizing system

A technology of absorption stabilization system and catalytic cracking unit, which is applied in the field of petroleum processing to achieve simple transformation, improve economic benefits, and reduce propylene content

Inactive Publication Date: 2008-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to reasons such as process and operation, a certain amount of C is usually entrained in the dry gas. 3 And the above components, the so-called dry gas "non-dry", so that high-value propylene is used as fuel and low-value

Method used

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  • Method for reducing propylene concentration of dry gas in catalytic cracking device absorption stabilizing system
  • Method for reducing propylene concentration of dry gas in catalytic cracking device absorption stabilizing system
  • Method for reducing propylene concentration of dry gas in catalytic cracking device absorption stabilizing system

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Embodiment 1

[0031] figure 2 For the technological process of the catalytic cracking unit fractionation and absorption stabilization system of the present embodiment, compared with the technological process flow of the catalytic cracking unit fractionation and absorption stabilization system of the comparative example, this embodiment has made the following improvements:

[0032] (1) Improvement of supplementary absorbent process

[0033]Open a side line at the third theoretical plate of the stabilizing tower (the first theoretical plate at the bottom of the stabilizing tower is numbered 1), and produce a stream of light gasoline, which first passes through the newly added desorption tower intermediate reboiler and desorption tower The mid-stage reflux heat exchange is then cooled to 40°C by a circulating water cooler, and then enters the top of the absorption tower as a supplementary absorbent, and at the same time cancels the process of supplementary absorbent entering the absorption to...

Embodiment 2

[0045] image 3 It is the process flow chart of the fractionation and absorption stabilization system of the catalytic cracking unit in this embodiment. The difference between this embodiment and embodiment 1 lies in the improvement of the heat exchange process, which is as follows:

[0046] (2) Improvement of heat transfer process

[0047] The heat exchange process of heating deethanized gasoline with diesel oil is as follows: the diesel oil extracted from the catalytic main fractionation tower is used to heat the deethanized gasoline at one time, and at the same time, the process of heating the deethanized gasoline with stabilized gasoline is canceled (that is, the stabilized gasoline first passes through the desorption tower and then boils again. The device and the middle section of the desorption tower are refluxed for heat exchange, and then cooled by circulating water, and then all of them are discharged from the device) The supplementary absorbent in the side line exch...

Embodiment 3

[0056] The difference between this embodiment and Example 1 is that the extraction position of the side line supplementary absorbent is changed from the third theoretical plate to the fifth theoretical plate and the temperature of the side line supplementary absorbent entering the absorption tower is changed from 40°C to 35°C. The rest of the process is the same. The effect of this embodiment is basically the same as that of Embodiment 1.

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Abstract

The invention discloses a method for lowering propylene concentration in dry gas of an absorption-stabilization system of a catalytic cracking unit, which achieves through improving supplement absorbent flow and heat exchanging process in the absorption-stabilization system. The method comprises the following steps: opening a lateral line on a third to a fifth theoretical plate of a stabilizer, producing light gasoline to be supplementing absorbing agent of an absorbing tower, simultaneously canceling the process of the original supplementing absorbing agent to get into the absorbing tower, increasing heat supply of a reboiler in the center of an absorption tower, or heating up deethanization gasoline with diesel oil. The method can obviously lower the concentration of propylene and propane in dry gas, which greatly improves propylene yield rate of the absorption-stabilization system of the catalytic cracking unit, and meanwhile, products are guaranteed, and energy consumption of a device is basically constant. The problem of inadequate heat load of the reboiler in the center of the absorption tower which is caused by flow process alternation is excellently solved through the optimization of the heat exchanging flow. In the whole process, flow reconstruction is simple and feasible, and economic benefit is obvious.

Description

technical field [0001] The invention belongs to the field of petroleum processing, in particular to a method for reducing the concentration of propylene in the dry gas of a catalytic cracking unit absorption and stabilization system. Background technique [0002] Propylene (C 3 h 6 ) is one of the most important basic organic chemical raw materials, and is the raw material for the production of polypropylene, acrylonitrile, propylene oxide, cumene, isopropanol and carbonyl alcohol. According to reports, the total production capacity of polypropylene in my country in 2006 was 6.91 million tons, an increase of 1.2 times compared with 2001, and the average growth rate in five years was 16.7%, but it still could not meet the demand. The import volume in 2005 and 2006 exceeded 3 million tons. Accounted for 34.6% of domestic consumption in the current period. Therefore, it is an urgent need for national economic development to produce more propylene. [0003] At present, 66% of...

Claims

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Application Information

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IPC IPC(8): C10G11/00C10G70/06
Inventor 李国庆黄明富李亚军王萌
Owner SOUTH CHINA UNIV OF TECH
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