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Device and method for treating methanol-to-olefin waste alkali solution

A technology for methanol to olefins and treatment devices, which is applied in multi-stage water treatment, aerobic process treatment, natural water treatment and other directions, can solve the problems of high requirements on equipment material and safety performance, low organic matter removal efficiency, and large equipment investment scale. , to achieve the effect of reducing one-time investment and comprehensive processing cost of system operation, simple structure, low equipment investment and operating cost

Inactive Publication Date: 2016-07-20
北京斯凯特达科技开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methanol-to-olefins process technology has become increasingly mature in recent years, but the waste lye produced during the production process is difficult to treat due to its high salt content, strong alkalinity, and high organic matter concentration, which is a major environmental protection problem affecting the development of methanol-to-olefins technology
In the methanol-to-olefins plant that was put into operation in the past few years, some enterprises used incineration, wet oxidation and other methods to treat the waste lye. The above-mentioned treatment methods mainly have the following problems: 1) large-scale equipment investment; 2) high operating costs; 3 ) The operation process is carried out under high temperature and high pressure conditions, which requires high equipment materials and safety performance; 4) The treatment process is easy to cause blockage of pumps and pipelines; 5) The removal efficiency of organic matter is low, and the treated wastewater is easy to be used by subsequent The operation of the sewage plant caused an impact

Method used

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  • Device and method for treating methanol-to-olefin waste alkali solution

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Embodiment 1

[0025] A treatment device for methanol-to-olefin waste lye of the present invention comprises a pH adjustment tank 1, a grease trap 2, a bioreactor 3, and a sedimentation tank 4 connected in sequence through pipelines, and the sedimentation tank 4 and the bioreactor 3 pass through the sewage Mud return pipe 5 is connected. The spent lye from methanol to olefins passes through the pH adjustment tank 1, the grease trap 2, the bioreactor 3 and the sedimentation tank 4 in sequence. 2 Remove slick oil and polymers in the waste caustic; decompose the pollutants in the waste caustic in the bioreactor 3, separate the sludge and waste water in the sedimentation tank 4, and return the sludge to the biological reaction device 3.

[0026] The pH adjustment tank 1 is connected with the concentrated sulfuric acid tank 12 through the concentrated sulfuric acid dosing metering pump 11, and a stirrer 13 is installed in the pH adjustment tank. In the pH adjustment tank 1, sulfuric acid is add...

Embodiment 2

[0032] Waste lye produced by a methanol-to-olefins plant, wherein: COD is 10,000 mg / l, sodium carbonate concentration is 10.2wt%, and sodium hydroxide concentration is 1.5wt%. In organic pollution, the concentration of phenol is 55mg / l, methanol concentration is 270mg / l, benzene is 18mg / l, ethylbenzene is 6mg / l, toluene is 3mg / l, dimethyl ether is 0.8mg / l, ethyl ketone is 25mg / l, methyl ethyl ketone is 0.08mg / l , Ammonia nitrogen 48mg / l. Adopt the method of the present invention to process, the inventive method comprises the following steps:

[0033] (1) pump the spent lye into the pH adjustment tank, add concentrated sulfuric acid to adjust the pH of the spent lye to 5.8;

[0034] (2) the waste lye after pH adjustment is carried out oil separation treatment in the grease trap, removes slick oil and polymer; The residence time of waste lye in the grease trap is 0.5h;

[0035] (3) The waste lye after the oil separation treatment enters the bioreactor, and the salt-tolerant mi...

Embodiment 3

[0039] The waste lye produced by the methanol-to-olefins unit, wherein: COD is 8000mg / l, sodium carbonate concentration is 10wt%, sodium hydroxide concentration is 1.2wt%, phenol concentration in organic pollution is 50mg / l, methanol concentration is 260mg / l, benzene 15mg / l, ethylbenzene 5mg / l, toluene 2mg / l, dimethyl ether 1mg / l, ethyl ketone 30mg / l, methyl ethyl ketone 0.1mg / l, ammonia nitrogen 50mg / l. Adopt the method of the present invention to process, the inventive method comprises the following steps:

[0040] (1) pump the spent lye into the pH adjustment tank, add concentrated sulfuric acid to adjust the pH of the spent lye to 6.1;

[0041] (2) the waste lye after the pH adjustment is carried out in the grease trap to remove oil slicks and polymers; the residence time of the waste lye in the grease trap is 1.0h;

[0042] (3) The waste lye after the oil separation treatment enters the bioreactor, and the salt-tolerant microorganisms in the bioreactor are used to remove...

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Abstract

The invention discloses a device and a method for treating a methanol-to-olefin waste alkali solution. The treatment device comprises a pH regulating tank, an oil separator, a bioreactor and a settling pond which are sequentially connected through pipelines, wherein the settling pond is connected with the bioreactor through a sludge return pipe. The treatment method disclosed by the invention adopts the previous device and comprises the steps of pH regulation, oil separation, microbe decomposition and settling treatment. The treatment device of the waste alkali solution during methanol-to-olefin production is simple in structure and low in cost; compared with the traditional burning method, wet oxidation process and other waste alkali solution treatment process flows, the method disclosed by the invention is short in flow and low in equipment investment and operating cost, one-time investment and comprehensive system operating treatment cost are reduced, and the method is implemented under normal temperature and normal pressure conditions. Moreover, a high-temperature high-pressure operating mode existing in the burning method, the wet oxidation process and the like is avoided, potential risk factors are eliminated, pollutants are not transferred, secondary pollution is avoided, and the method is an environmental-friendly process technology in a real sense.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment device and method for waste lye in the production process of methanol to olefins. Background technique [0002] The waste caustic liquor produced by methanol to olefins (MTO for short) comes from the olefin separation process of the methanol to olefins unit. This process uses fresh liquid caustic soda to absorb acid gases such as carbon dioxide and hydrogen sulfide produced during the olefin separation process, and finally forms a large amount of spent caustic soda liquid. Sodium hydroxide 1.5%, sodium carbonate 10.5%, water 88% in waste lye, phenol concentration in organic pollution 50mg / l, methanol concentration 260mg / l, also contain a small amount of benzene, ethylbenzene, toluene, dimethyl ether, ethyl Ketone, methyl ethyl ketone, etc., the main pollutant indicators COD10000mg / l, TOC2000-6000mg / l, ammonia nitrogen 50mg / l. [0003] The methanol-to-...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
CPCC02F9/00C02F1/40C02F1/52C02F1/66C02F3/02C02F3/34C02F2103/36C02F2301/08
Inventor 冯旦谭文侯卫华黄志杰吴建华陆君进赵宏喜徐邵东孙涛
Owner 北京斯凯特达科技开发有限公司
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