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Processing method of water flowing out of technological water stripper of ethylene unit

A treatment method and technology of an ethylene plant, applied in the field of membrane treatment of effluent from an ethylene process water stripper, can solve problems such as discharge to the sewage treatment system, increased fresh water consumption, poor quality of effluent from the stripper, etc., to extend the operating cycle, Avoid fouling, effect of small transmembrane pressure difference

Active Publication Date: 2011-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited effect of stripping, the process water contains a relatively high content of hydrocarbons (such as styrene), which will cause fouling after entering the diluted steam generation system, often causing the stripped process water to be discharged to the sewage treatment system; in order to ensure The quality of the dilution steam, the dilution steam generator must have a certain amount of blowdown. Due to the poor quality of the effluent water from the stripping tower, the amount of blowdown water from the dilution steam generation system increases; due to the large amount of drainage, the fresh water consumption of the system is also increased.

Method used

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  • Processing method of water flowing out of technological water stripper of ethylene unit
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  • Processing method of water flowing out of technological water stripper of ethylene unit

Examples

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Effect test

Embodiment 1

[0022] The first-stage hydrophobic microporous membrane module is used to treat the effluent water from the ethylene process water stripper. The schematic diagram of the process flow is shown in figure 1 .

[0023] The water discharged from the stripping tower contains impurities such as hydrocarbons and acid gases, among which the content of styrene is 5 mg / L.

[0024] A polyarylethersulfoneketone hollow fiber microporous hydrophobic membrane module is used to treat the stripping tower discharge water. The inner diameter of the membrane fiber in the membrane module is 0.52mm, and the average pore diameter of the membrane fiber is 0.2μm (microfiltration membrane).

[0025] Firstly, reduce the temperature of the water discharged from the stripping tower to 95°C, and then mix ethane gas into the water discharged from the stripping tower through the gas mixing device, and the gas-water volume ratio is 0.005:1. The water discharged from the stripping tower after gas mixing enters...

Embodiment 2

[0030] The second-stage hydrophobic microporous membrane module is used to treat the effluent water from the ethylene process water stripper. The schematic diagram of the process flow is shown in figure 2 .

[0031] The water discharged from the stripping tower contains impurities such as hydrocarbons and acid gases, among which the content of styrene is 5 mg / L.

[0032] Polyaryl ether sulfone ketone hollow fiber microporous hydrophobic membrane modules are used to treat the effluent from the water stripping tower of the ethylene process. The inner diameter of the membrane fibers in the membrane module is 0.52 mm, and the average pore diameter of the membrane fibers is 0.2 μm (microfiltration membrane).

[0033] Firstly, reduce the temperature of the water discharged from the stripping tower to 50°C, and then mix ethane gas into the water discharged from the stripping tower through the gas mixing device, and the gas-water volume ratio is 0.01:1. The water discharged from the...

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Abstract

The invention provides a processing method of water flowing out of a technological water stripper of an ethylene unit. In the invention, hydrocarbon and acid gas dissolved in water flowing out of the technological water stripper is removed by a vacuum membrane distillation method which mixes inert gas in inflowing water, so as to improve water quality of inflowing water of a diluting vapor generation system. The method not only further lowers content of hydrocarbon and acid gas in water flowing out of the technological water stripper, avoids scaling of the diluting vapor generation system, prolongs running period of the device, and reduces sewage water discharge amount of the diluting vapor generation system, usage of desalted water of ethylene unit and usage of system corrosion inhibitor.

Description

technical field [0001] The invention relates to an industrial water treatment method, in particular to a membrane treatment method for effluent from an ethylene process water stripping tower. Background technique [0002] In the ethylene plant, the mixture of cracked gas and dilution steam is cooled to about 105-110°C through the quenching boiler and oil quenching tower, and then enters the quenching water tower. At the top of the quenching water tower, the cracked gas temperature drops to about 40°C and is sent to the cracked gas compressor. The temperature of the quenching water tower tank is about 80-90°C, and most of the dilution steam and pyrolysis gasoline can be separated. After the oil-water mixture in the tower tank of the quenching water tower is separated from oil and water, part of the water (called quenching water) is cooled and returned to the quenching water tower for tower top spraying; part of the water (called process water) is sent to the dilution steam g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F1/08
Inventor 高凤霞周霖栾金义刘昌
Owner CHINA PETROLEUM & CHEM CORP
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