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Method and device for treating ethylene waste lye

A technology for ethylene waste lye and waste lye, which is applied in the fields of natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. It can solve the clogging of the wet oxidation reactor, the insufficient treatment effect, and the harmfulness of other treatment units, etc. To ensure the gas-liquid mass transfer efficiency and oxidation effect, ensure long-term stable operation, and reduce the risk of clogging

Pending Publication Date: 2022-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology adopts the method of mixing waste lye and air for oxidation to preheat the feed. On the one hand, substances that are prone to thermal polymerization will produce high polymers in the subsequent preheating process, which will cause blockage of the heat exchanger, and because the air contains oxygen, Oxygen will participate in the formation of peroxide self-polymers, resulting in further formation of high polymers, which will aggravate the blockage of heat exchangers
Moreover, the polymer-containing waste lye enters the subsequent wet oxidation reactor, and long-term operation will also cause blockage and local overheating of the wet oxidation reactor.
[0006] In summary, the various methods currently used to treat waste lye have problems such as inappropriate, insufficient treatment effect, harmful to other treatment units, or large investment and high operating costs.

Method used

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  • Method and device for treating ethylene waste lye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]The ethylene waste alkali liquor treated in this example comes from the waste alkali liquor discharged during the alkali washing process of ethylene cracking gas in a factory, wherein the COD concentration is 35000 mg / L, S 2- The concentration is 15200mg / L, and the petroleum is 1320mg / L, including butadiene, isoprene and other substances.

[0033] with attached figure 1 The treatment process and device shown are used for treatment, and the waste ethylene lye is transported to the air flotation tank for air flotation treatment, and the gas after gas-liquid separation in this process is used as air flotation gas to remove diolefin substances in the waste lye.

[0034] After the waste lye is treated by air flotation, it is transported to the heat exchanger by the feed pump, and exchanges heat with the material discharged from the wet oxidation reactor. After the heat exchange reaches 160 °C, it enters the wet oxidation reactor and reacts with the incoming compressed air. ,...

Embodiment 2

[0038] The ethylene waste alkali liquor treated in this example comes from the waste alkali liquor discharged during the alkali washing process of ethylene cracking gas in a factory, wherein the COD concentration is 10000 mg / L, S 2- The concentration is 3700mg / L, and the petroleum is 650mg / L, including butadiene, isoprene and other substances.

[0039] with attached figure 1 The treatment process and device shown are used for treatment, and the waste ethylene lye is transported to the air flotation tank for air flotation treatment, and the gas after gas-liquid separation in this process is used as air flotation gas to remove diolefin substances in the waste lye.

[0040] After the waste lye is treated by air flotation, it is transported to the heat exchanger by the feed pump, and exchanges heat with the material discharged from the wet oxidation reactor. After the heat exchange reaches 120 °C, it enters the wet oxidation reactor and reacts with the incoming compressed air. , ...

Embodiment 3

[0044] The ethylene waste alkali liquor treated in this example comes from the waste alkali liquor discharged during the alkaline washing process of ethylene cracking gas in a factory, wherein the COD concentration is 50000 mg / L, S 2- The concentration is 22000mg / L, and the petroleum is 1530mg / L, including butadiene, isoprene and other substances.

[0045] with attached figure 1 The treatment process and device shown are used for treatment, and the waste ethylene lye is transported to the air flotation tank for air flotation treatment, and the gas after gas-liquid separation in this process is used as air flotation gas to remove diolefin substances in the waste lye.

[0046] After the waste lye is treated by air flotation, it is transported to the heat exchanger by the feed pump, and exchanges heat with the material discharged from the wet oxidation reactor. After the heat exchange reaches 190 °C, it enters the wet oxidation reactor and reacts with the incoming compressed air....

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Abstract

The invention relates to a method and a device for treating ethylene waste lye, the ethylene waste lye enters a gas floating unit for treatment, is conveyed to a heat exchange unit after treatment, enters a wet oxidation unit after heat removal, and is in contact with oxygen-containing gas under the pressure condition of keeping the solution in a liquid phase for wet oxidation reaction; the oxidized material is returned to the heat exchange unit to preheat the waste alkali liquid, the material after heat exchange is cooled and decompressed and then enters the gas-liquid separation unit, and the gas phase after gas-liquid separation is returned to the air floatation unit. According to the characteristics of the ethylene waste alkali liquor, reaction heat is utilized to the maximum extent, and meanwhile, the problems that heat exchange equipment is blocked due to thermal polymers in the long-term operation process, and local overtemperature is generated in the wet oxidation process can be solved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a method and a device for treating ethylene waste alkali liquor. Background technique [0002] In the ethylene production process, the alkaline washing method is generally used to remove CO from the cracked gas. 2 , H 2 S and other acid gases. The alkaline washing process produces a large amount of waste lye. In addition to the remaining NaOH, this type of waste lye also contains Na generated during the alkaline washing process. 2 S, Na 2 CO 3 and other inorganic salts. Because ethylene waste lye contains high concentrations of COD and sulfide, and its biodegradability is poor, most of the treatment schemes for ethylene waste lye at home and abroad are to pre-treat to remove sulfide and organic matter, so as to prevent the biochemical system of sewage treatment plant from being damaged. impact. [0003] According to the wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36C02F101/30C02F101/10
CPCC02F9/00C02F1/24C02F1/74C02F1/20C02F2103/36C02F2101/30C02F2101/101C02F2209/02C02F2209/08C02F2301/063C02F2303/14
Inventor 周彤郭宏山邓德刚秦丽姣
Owner CHINA PETROLEUM & CHEM CORP
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