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Double tower gas fractionator and fractional method

A gas fractionation and tower still technology, which is applied in the field of double-column gas fractionation devices with high propylene recovery rate, can solve problems such as difficulty and propylene loss, and achieve the effects of increasing benefits, high propylene recovery rate, and improving product recovery rate.

Inactive Publication Date: 2005-10-19
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The molar concentration of C3 components in the gas phase distillate at the top of the deethanizer is usually above 60%, and most of this part of the gas is burned as fuel gas, thus causing a large amount of propylene loss
The recovery rate of propylene in the existing three-tower process reaches 95%, which is already close to the limit, and it is difficult to further improve it

Method used

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  • Double tower gas fractionator and fractional method

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Embodiment Construction

[0046] A 120,000-ton gas fractionation unit originally adopted a three-tower process, and the deethanizer tower top continuously discharges deethanizer gas. The concentration of propylene in the bottom liquid of the depropanizer is controlled below 0.1%, and the actual analysis value is often zero, that is, the loss of propylene in the bottom liquid of the depropanizer is very small, and the loss of propylene per hour is only about 10kg. The propane concentration of the propylene tower still liquid is controlled at not less than 97%, the actual propane concentration is often around 98%, the rest is propylene, and the propylene loss of the still liquid is controlled below 60kg per hour. The propylene recovery rate of the device has been maintained at about 95% for a long time, so most of the propylene loss is escaped from the top of the deethanizer tower.

[0047] The device was tested in March 2004 for the deethanizer. During the test period, according to the production recor...

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Abstract

The double tower gas fractionator consists of propane eliminating tower, propylene tower, heat exchanger, pump container and connecting pipeline. It features the propane eliminating tower with condensating circulation loop in the top and re-boiling circulation loop in the bottom; and the propylene tower with condensating circulation loop in the top and re-boiling circulation loop in the bottom. The present invention can raise the quality of liquefied petroleum gas material and control the C2 component concentration in the material within 0.001-0.2 mol%, so as to reach the aim of eliminating ethane eliminating tower while obtaining relatively high propylene recovering rate, up to 98 %.

Description

technical field [0001] The invention relates to petrochemical equipment and technology, in particular to a double-tower gas fractionation device with no light component gas discharge and high propylene recovery rate. [0002] The present invention also relates to a fractionation method of the double-tower gas fractionation device. Background technique [0003] The gas fractionation unit is one of the important refinery production units. It is the separation of liquefied petroleum gas into propylene, propane, carbon four components and pentane products. The products of the gas fractionation unit can be used as raw materials for polypropylene unit, MTBE unit and alkylation unit. [0004] At present, the traditional gas fractionation device that dominates in China is a three-tower process, namely [0005] ——The liquefied petroleum gas first enters the depropanizer to separate the C2 and C3 components from the heavier C4 and C5 components; [0006] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14
Inventor 陆恩锡张慧娟潘琪
Owner SOUTH CHINA UNIV OF TECH