Method for treating and recycling MTO process wastewater

A wastewater treatment and process technology, applied in aerobic and anaerobic process treatment, natural water treatment, biological water/sewage treatment, etc. Reusing reports, etc.

Active Publication Date: 2011-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Chinese patent applications CN101139117A and CN101139118A disclose a wastewater treatment process containing methanol and dimethyl ether. The specific method is: the wastewater containing methanol and dimethyl ether is pressurized to exchange heat with the purified water of the stripping tower, and then enters Stripping tower, the gas mixture such as methanol produced at the top of the stripping tower enters the reflux tank after heat exchange, and part of it is returned to the top of the stripping tower as reflux; the other part is sent to the outside of the device or us

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  • Method for treating and recycling MTO process wastewater

Examples

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Example Embodiment

[0033] Example 1

[0034] The main water quality characteristics of the purified water at the bottom of the MTO process stripping tower: the temperature of the purified water is 3℃, the pH is 5, and COD cr It is 400mg / L, methanol content is 50mg / L, acetic acid content is 100mg / L, conductivity is 100μs / cm, etc.; the wastewater enters the aerobic biochemical reactor after the nutrient balance of the biochemical treatment, the residence time is 8h, and it is dissolved in the sewage The oxygen is 3mg / L and the sludge concentration is 1.6g / L.

[0035] The wastewater after aerobic biochemical treatment is settled by the sand filter device in the secondary settling tank and then enters the PVDF hollow fiber ultrafiltration membrane system with a pore size of 0.05μm. It is operated by cross-flow filtration, and the operating flux of the ultrafiltration membrane is 100L / m 2 h. After the water inflow interval is 45 minutes at both ends, perform the dispersion washing operation of adding alkal...

Example Embodiment

[0038] Example 2

[0039] The characteristics of the purified water at the bottom of the MTO process stripping tower: the purified water temperature is 40℃, pH is 8, COD cr It is 600mg / L, methanol content is 100mg / L, acetic acid content is 500mg / L, conductivity is 800μs / cm, etc.; the wastewater enters the aerobic biochemical reactor after the nutrient balance of the biochemical treatment, and the wastewater retention time is 10h. The dissolved oxygen is 4.5mg / L and the sludge concentration is 3.5g / L.

[0040] After aerobic biochemical treatment, it is settled in the sand filter device of the second settling tank and then enters the PES hollow fiber ultrafiltration membrane system with a pore size of 0.2μm. It operates in a cross-flow filtration mode. The operating flux of the ultrafiltration membrane is 300L / m 2 h. After the water inflow interval is 30 minutes at both ends, carry out the dispersion washing operation of adding alkali and acid. The cleaning time of acid and alkali add...

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Abstract

The invention provides a method for treating and recycling byproduct water of a production process for converting an oxygen-containing compound into olefin, and relates to the technical field of process wastewater treatment and recycle of coal chemical industry and natural gas chemical industry. The combined process can effectively remove organic small molecular substances in the process byproduct water, the removal rate of COD in the wastewater can reach over 90 percent according to the pretreatment process, and the pretreated wastewater can meet the water quality requirement of circulating water supplementing water and boiler supplementing water after ultra-filtration and reverse osmosis treatment respectively or is used for supplementing water in the MTO process or other chemical processes. The method has the advantages of stable and reliable treatment effect, low treatment cost and simple and feasible operation, and is easy to realize industrialized application.

Description

[technical field] [0001] The invention relates to the field of waste water treatment, in particular to methods for treating and reusing process by-product water in coal-to-olefins in coal chemical technology, natural gas-to-olefins in natural gas chemical technology, and methanol-to-olefins process. [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 is mainly steam cracking of hydrocarbons, and the raw material is mainly naphtha. The three world oil crises since the 1970s have led to rising international crude oil prices and rising olefin production costs. In this context, it has prompted people to seek new ways to further develop non-petroleum resources, which has greatly promoted the development of coal chemical industry and natural gas chemical industry, and the requirem...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F3/10C02F3/30C02F9/14C02F1/52C02F103/36C02F1/66
CPCY02W10/10
Inventor 杨永强程学文王娟张新妙
Owner CHINA PETROLEUM & CHEM CORP
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