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Desulfuration method of environmental-friendly liquefied petroleum gas

A liquefied petroleum gas, environmentally friendly technology, applied in chemical instruments and methods, separation methods, petroleum industry, etc., to achieve the effect of simple equipment, high flow rate, and solving the bottleneck of processing capacity

Active Publication Date: 2013-06-26
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At present, there is no efficient, easy-to-operate, low-cost, and environmentally-friendly method for desulfurizing liquefied petroleum gas in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw material is catalytic liquefied petroleum gas containing 39ppm hydrogen sulfide, 320ppm mercaptan sulfur, and 51ppm carbonyl sulfide sulfur. It enters the membrane device through the raw material pump at an operating pressure of 0.8 MPa (MPa) and an operating temperature of 30°C, and passes through the plate frame. Separation of composite membrane composed of polyvinylidene fluoride-based membrane and polyhydroxyl-terminated polybutadiene-acrylonitrile membrane, 99.03% refined liquefied petroleum gas is obtained on the retentate side of the membrane device, and the hydrogen sulfide sulfur content is 1ppm , mercaptan sulfur content 4ppm, carbonyl sulfide sulfur 1ppm; get 0.97% sulfide-rich liquefied petroleum gas on the permeation side of the membrane device, hydrogen sulfide content 3928ppm, mercaptan sulfur content 32581ppm, carbonyl sulfide 5155ppm .

Embodiment 2

[0039] The raw material is coking liquefied petroleum gas containing 30ppm hydrogen sulfide, 2000ppm mercaptan sulfur, and 30ppm3 carbonyl sulfide sulfur. It enters the membrane device through the raw material pump at an operating pressure of 0.8 MPa (MPa) and an operating temperature of 30°C, and passes through the plate frame. The composite membrane composed of polyvinylidene fluoride-based membrane and polyhydroxyl-terminated polybutadiene-acrylonitrile membrane of the type membrane device is separated, and 99.17% of refined liquefied petroleum gas is obtained on the retentate side of the membrane device, the hydrogen sulfide content is 1ppm, and the sulfur content is 1ppm. Alcohol sulfur content is 5ppm, carbonyl sulfide sulfur content is 1ppm; 0.83% sulfide-rich liquefied petroleum gas is obtained on the permeation side of the membrane device, hydrogen sulfide content is 3542ppm, mercaptan sulfur content is 240366ppm, and carbonyl sulfide sulfur content is 3483ppm.

Embodiment 3

[0041] The raw material is catalytic liquefied petroleum gas containing 40ppm hydrogen sulfide sulfur, 300ppm mercaptan sulfur, and 30ppm carbonyl sulfide sulfur. It enters the membrane device through the raw material pump at an operating pressure of 0.8 MPa (MPa) and an operating temperature of 30°C. Separation of the composite membrane composed of polyvinylidene fluoride base membrane and polyhydroxyl-terminated polybutadiene-acrylonitrile membrane of the spiral membrane device, 99.09% of refined liquefied petroleum gas is obtained on the retentate side of the membrane device, and the content of hydrogen sulfide and sulfur 1ppm, mercaptan sulfur content 6ppm, carbonyl sulfide sulfur 1ppm; get 0.91% sulfide-rich liquefied petroleum gas on the permeation side of the membrane device, hydrogen sulfide content 4308ppm, mercaptan sulfur content 32313ppm, carbonyl sulfide sulfur 3220ppm.

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Abstract

The invention provides a desulfuration method of environmental-friendly liquefied petroleum gas. In the invention, after alcohol amine elution is carried out on the liquefied petroleum gas to remove the sulfureted hydrogen, the membrane separation technique is adopted for desulfuration in the complete absence of alkali, desulfurating agent or catalyst; The membrane separator adopts a plate-and-frame membrane separator and / or a spiral-wound membrane separator, the membrane material is the composite membrane composed of polyvinylidene fluoride basal membrane and telechelic hydroxyl polybutadiene-acrylonitrile membrane. The invention is characterized by high efficiency, environmental protection, easy operation and low operating cost and the like.

Description

technical field [0001] The invention relates to an environment-friendly liquefied petroleum gas desulfurization method. More specifically, the present invention relates to an environment-friendly desulfurization method in which liquefied petroleum gas is eluted with alcohol amine to remove hydrogen sulfide, and then adopts membrane separation technology to remove inorganic sulfur and organic sulfur. Background technique [0002] Liquefied petroleum gas is a product of petroleum processing and an important raw material for petrochemical and civil fuels. However, impurities such as sulfides (such as hydrogen sulfide and mercaptans) contained in liquefied petroleum gas have brought great harm to the subsequent processing and utilization of liquefied petroleum gas and the environment. Therefore, desulfurization of liquefied petroleum gas is of great significance to the clean production and utilization of liquefied petroleum gas; moreover, high sulfur content will cause corrosio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D53/22C10L3/12
Inventor 李继定闻学兵陈剑蒲延芳
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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