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A kind of treatment method of methanol-to-olefin waste lye

A technology of methanol to olefins and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems such as the generation and treatment of MTO waste lye that have not yet been seen, Achieve stable treatment effect, easy operation and low NaOH consumption

Active Publication Date: 2018-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the prior art is concerned, there are no public reports on the generation and treatment of MTO waste lye

Method used

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  • A kind of treatment method of methanol-to-olefin waste lye

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Use fresh NaOH solution with a mass concentration of 6% and additive HK-1312 to alkali wash MTO olefin gas. The ratio of the mass of fresh NaOH solution to MTO olefin gas is 1.8%, and the mass ratio of additive to MTO olefin gas It is 80ppm. After the liquid phase discharged from the alkaline washing is subjected to oil separation treatment with a residence time of 6 hours, the COD of the waste alkaline solution is 5035mg / L and the total organic nitrogen content is 418mg / L. Use ozone as an oxidant to oxidize the waste lye after oil separation. The amount of ozone added is twice the COD amount of the waste lye. The reaction temperature is 95°C, the reaction pressure is normal pressure, and the reaction time is 30 minutes. Under the conditions, the COD of the effluent is 830mg / L and the organic nitrogen content is 22mg / L.

Embodiment 2

[0056] Use fresh NaOH solution with a mass concentration of 8% and additive HK-1312 to alkali wash MTO olefin gas, where the ratio of the mass of fresh NaOH solution to MTO olefin gas is 1.2%, and the ratio of the mass of additive to MTO olefin gas It is 150ppm. After the liquid phase discharged from the alkaline washing is subjected to oil separation treatment with a residence time of 2h, the COD of the waste lye is 9100mg / L and the total organic nitrogen content is 755mg / L. Use potassium persulfate solution as an oxidant to oxidize the waste lye after oil separation. The concentration of potassium persulfate solution is 25%, and the amount of potassium persulfate solution added (calculated as potassium persulfate) is the waste lye COD 10 times the amount, under the conditions of a reaction temperature of 100°C, a reaction pressure of normal pressure, and a reaction time of 60 minutes, the COD of the effluent is 1210 mg / L and the organic nitrogen content is 28 mg / L.

Embodiment 3

[0058] Use fresh NaOH solution with a mass concentration of 10% and additive HK-1312 to alkali wash MTO olefin gas, where the ratio of the mass of fresh NaOH solution to MTO olefin gas is 1%, and the ratio of the mass of additive to MTO olefin gas It is 50ppm. After the liquid phase discharged from the alkaline washing is subjected to the oil separation treatment with a residence time of 36h, the COD of the waste alkaline solution is 10300mg / L and the total organic nitrogen content is 747mg / L. Use ozone as an oxidant to oxidize the waste lye after oil separation. The amount of ozone added is 5 times the COD amount of the waste lye. The reaction temperature is 70°C, the reaction pressure is normal pressure, and the reaction time is 240 minutes. Under the conditions, the COD of the effluent is 450mg / L and the organic nitrogen content is 3mg / L.

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Abstract

The present invention relates to a treatment method of a methanol-to-olefin (MTO) waste alkali liquid, and the treatment method comprises the following steps: 1, a MTO olefin gas containing an acid gas is treated by alkali washing, an aid is used during the alkali washing, and after the alkali washing, the MTO olefin gas enters a subsequent process to continue processing; 2, an oil-separation-treated waste alkali liquid is obtained by oil separation treatment of a discharged liquid phase of the alkali washing, and floating oil produced by the oil separation treatment is further treated by a conventional method, and 3, the oil-separation-treated waste alkali liquid is oxidized, ozone or a potassium persulfate solution is used as an oxidizing, a conventional process is used for follow-up treatment of oxidation yielding water, or the conventional process is used for follow-up treatment of the oxidation yielding water after the oxidation yielding water is mixed with other wastewater in a MTO device. The treatment method of the methanol-to-olefin waste alkali liquid is table in treatment effect, low in NaOH consumption, and easy in operation, and the yielding water and other wastewater in the MTO device can be mixed and enter into a conventional sewage treatment plant for further processing.

Description

Technical field [0001] The invention relates to the technical field of methanol to olefins (MTO), in particular to a method for processing methanol to olefin waste lye. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials and play a very important role in modern petroleum and chemical industries. Traditionally, the source of ethylene and propylene was mainly steam cracking of hydrocarbons, and the raw material was mainly naphtha. In recent years, the oxygenate-to-olefin (OTO) process has become increasingly mature, especially the methanol-to-olefin (MTO) process has begun to be applied on a large scale. [0003] Chinese patent CN102180486A discloses the composition of traditional ethylene waste lye. In terms of mass percentage, among the components: sodium sulfide accounts for 10-20%, sodium carbonate accounts for 4-5%, and sodium hydroxide accounts for 1-3%. [0004] Chinese patent CN102923901A discloses the C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 莫馗李海龙程学文杨宇斐高凤霞张宾王珺
Owner CHINA PETROLEUM & CHEM CORP