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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 used as a raw material for the MTO device; the stripping tower Purified water comes out at the bottom, and is sent out of the device after heat exchange with wastewater containing methanol and dimethyl ether. The total content of methanol and dimethyl ether in the purified water after stripping is not more than 100ppm, which can meet the water quality requirements of sewage treatment plants , but there is no report on biochemical treatment and reuse in the patent
Therefore, there are currently no data reports on the treatment and reuse of excess by-product water in the MTO process.

Method used

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Embodiment 1

[0034] The main water quality characteristics of the purified water at the bottom of the stripping tower in the MTO process: the temperature of the purified water is 3°C, the pH is 5, and the COD cr The content of methanol is 400mg / L, the content of methanol is 50mg / L, the content of acetic acid is 100mg / L, and the conductivity is 100μs / cm. The oxygen is 3mg / L, and the sludge concentration is 1.6g / L.

[0035] The waste water after aerobic biochemical treatment enters the PVDF hollow fiber ultrafiltration membrane system with a pore size of 0.05 μm after being settled by the sand filter device in the secondary sedimentation tank. 2 h, after the time interval between water inlet at both ends is 45 minutes, the dispersive washing operation of adding alkali first and then adding acid is carried out, the acid-base dosing cleaning time is 10 seconds, and then the normal operation is continued after 5 seconds of washing operation; the process After repeating the operation 10 times, ...

Embodiment 2

[0039] Water quality characteristics of the purified water at the bottom of the stripping tower of the MTO process: the temperature of the purified water is 40°C, the pH is 8, and the COD cr The content of methanol is 600mg / L, the content of methanol is 100mg / L, the content of acetic acid is 500mg / L, and the conductivity is 800μs / cm. The dissolved oxygen is 4.5mg / L, and the sludge concentration is 3.5g / L.

[0040] After aerobic biochemical treatment, it settles through the sand filter device of the secondary sedimentation tank and enters the PES hollow fiber ultrafiltration membrane system with a pore size of 0.2 μm. It operates in the way of cross-flow filtration, and the operating flux of the ultrafiltration membrane is 300L / m 2 h, after 30 minutes of water inflow at both ends, the dispersive washing operation of adding alkali and acid is carried out. The washing time of acid and alkali is 12 seconds, and then the normal operation is continued after 8 seconds of washing oper...

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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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