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Treatment method of high-concentration process waste water during methanol-to-olefin process

A technology of methanol to olefins and a treatment method, which is applied in the field of treatment of high-concentration process wastewater from methanol to olefins, can solve problems such as no mention of wastewater, and achieve the effects of reducing the content of organic pollutants, stable treatment effect and easy operation.

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] From the above published literature, it can be seen that the current MTO wastewater treatment methods mainly focus on the physical separation of water and pollutants, and the proposed wastewater reuse point is only in principle. As for the wastewater that needs to be discharged, especially the high There is basically no mention of how to deal with wastewater with high concentration

Method used

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  • Treatment method of high-concentration process waste water during methanol-to-olefin process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The high-concentration MTO process wastewater undergoes homogenization treatment with an average residence time of 24 hours in the homogeneous adjustment unit, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: water temperature is 35°C, pH is 6.5, and COD is 45500mg / L, the content of methanol is 9500mg / L, the content of acetic acid is 4050mg / L, the content of acetone is 6650mg / L, the content of petroleum is 900mg / L, the content of SS is 2300mg / L, and the conductivity is 3560μS / cm.

[0086]In the oil separation coagulation sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, wherein the dosage of polyaluminum chloride is 50mg / L, and the dosage of polyacrylamide is 5mg / L. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 20mg / L, and the SS dropped to 50mg / L.

[0087] In the stripping unit, the waste water is pu...

Embodiment 2

[0092] The high-concentration MTO process wastewater is homogenized in the homogeneous adjustment unit with an average residence time of 12 hours, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: water temperature is 25°C, pH is 7.0, and COD is 50500mg / L, the content of methanol is 10100mg / L, the content of acetic acid is 4500mg / L, the content of acetone is 7200mg / L, the content of petroleum is 1050mg / L, the content of SS is 5200mg / L, and the conductivity is 4560μS / cm.

[0093] In the oil separation coagulation sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, wherein the dosage of polyaluminum chloride is 80mg / L, and the dosage of polyacrylamide is 5mg / L. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 35mg / L, and the SS dropped to 65mg / L.

[0094] In the stripping unit, the waste water is pumped into the pac...

Embodiment 3

[0099] The high-concentration MTO process wastewater has undergone homogenization treatment with an average residence time of 12 hours in the homogeneous adjustment unit, and the pH is adjusted by adding sodium hydroxide solution. The main water quality indicators of the effluent are as follows: water temperature is 40°C, pH is 7.5, and COD is 57500mg / L, the content of methanol is 11000mg / L, the content of acetic acid is 4950mg / L, the content of acetone is 8000mg / L, the content of petroleum is 1450mg / L, the content of SS is 7800mg / L, and the conductivity is 5960μS / cm.

[0100] In the oil separation coagulation and sedimentation unit, polyaluminum chloride and polyacrylamide are used as coagulants, and the dosage of polyaluminum chloride is 120mg / L, and no polyacrylamide is added. After the oil separation coagulation sedimentation treatment, the petroleum in the wastewater dropped to 45mg / L, and the SS dropped to 70mg / L.

[0101] In the stripping unit, the waste water is pumpe...

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Abstract

The invention relates to a treatment method of organic chemical waste water in the waste water treatment technical field, specifically to a treatment method of high-concentration process waste water during methanol-to-olefins (MTO) process, wherein after the MTO high-concentration process waste water is treated by the treatment flow of homogeneous regulation, oil-removing coagulating sedimentation, steam stripping, anaerobic treatment and post-precipitation, and corresponding condition, the COD of the waste water is reduced to be less than 500 mg / L from about 50000 mg / L, and the removal rate is more than 99%. The treatment method of high-concentration process waste water during methanol-to-olefin process has stable treatment effect, and simple and convenient operation, is easy to commercially produce and can be used for pre-treating MTO high-concentration process waste water before entering the normal sewage treatment plant.

Description

technical field [0001] The invention relates to a treatment method for organic chemical wastewater in the technical field of wastewater treatment, in particular to a treatment method for high-concentration methanol-to-olefin process wastewater. Background technique [0002] With the development of economy and society, especially the increasing demand for low-carbon olefins such as ethylene and propylene, which are basic organic chemical raw materials, resources such as naphtha and light diesel oil, which are traditional raw materials for low-carbon olefins, are facing increasing shortages. Therefore, accelerating the application of alternative production technologies has attracted extensive attention from all sides. [0003] In recent years, the technology development of methanol-to-olefins (MTO) from coal or natural gas has become increasingly mature in the world, and has obvious competitive potential. In the current form of increasing shortage and high price of crude oil,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCY02W10/37
Inventor 程学文莫馗侯秀华李正琪高凤霞张宾
Owner CHINA PETROLEUM & CHEM CORP
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