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Ethylene waste alkali liquor treatment method and treatment device

A technology for ethylene waste lye and treatment method, which is applied in the fields of natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., and can solve the problems of clogging of wet oxidation reactor, affecting treatment effect, clogging of heat exchanger, etc. , to ensure long-term stable operation, reduce energy consumption, and avoid blockage.

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, there are substances that are prone to thermal polymerization in ethylene waste lye, which will produce high polymers in the subsequent preheating process, and will Cause the heat exchanger to be blocked; and because the air contains oxygen, the oxygen will participate in the formation of peroxide self-polymers, which will further generate high polymers, which will aggravate the blockage of the heat exchanger
Moreover, the waste lye containing polymer enters the subsequent wet oxidation reactor, and long-term operation will also cause blockage and local overheating of the wet oxidation reactor, which will affect the treatment effect

Method used

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  • Ethylene waste alkali liquor treatment method and treatment device

Examples

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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] Deoxygenated water is used as the heat exchange medium to enter the heat exchange medium storage tank, and is lifted to the second heat exchanger by the heat exchange medium circulating pump. The deoxygenated water is used as a refrigerant to exchange heat with the discharge of the reactor. The heat medium ...

Embodiment 2

[0039] 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.

[0040] 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. Deoxygenated water is used as the heat exchange medium to enter the heat exchange medium storage tank, and is lifted to the second heat exchanger by the heat exchange medium circulating pump. The deoxygenated water is used as a refrigerant to exchange heat with the discharge of the reactor. The heat medium enters the ...

Embodiment 3

[0045] 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.

[0046] 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. Deoxygenated water is used as the heat exchange medium to enter the heat exchange medium storage tank, and is lifted to the second heat exchanger by the heat exchange medium circulating pump. The deoxygenated water is used as a refrigerant to exchange heat with the discharge of the reactor. The heat medium enters ...

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Abstract

The invention relates to a method and a device for treating ethylene waste lye, the ethylene waste lye is treated by an air flotation unit and then enters a first heat exchanger of a heat exchange unit, and the waste lye after heat removal enters a wet oxidation unit and is in contact with oxygen-containing gas under the pressure condition that the solution is kept in a liquid phase to perform wet oxidation reaction; the reacted material enters a second heat exchanger of the heat exchange unit, the material subjected to heat exchange enters a gas-liquid separation unit after being cooled and decompressed, and the separated gas phase returns to the air flotation unit; the first heat exchanger and the second heat exchanger use the same heat exchange medium. According to the characteristics of the ethylene waste alkali liquor, the problems of blockage and scaling of heat exchange equipment, local overtemperature of the wet oxidation reactor and the like caused by long-term operation can be avoided while reaction heat is fully utilized and the operation energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection wastewater treatment, and in particular relates to a treatment method and a treatment device for 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] CN9812108...

Claims

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Application Information

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