Treatment and reuse method of waste water in methanol-to-olefin process

A technology for methanol to olefins and waste water, which is applied in biological water/sewage treatment, degassed water/sewage treatment, water/sewage multi-stage treatment, etc. , a wide range of effects

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for whether the purified water contains other pollutants and how to further treat the purified water, the patent does not involve
[0017] It is not difficult to see from the above-mentioned published literature that at present, MTO wastewater treatme...

Method used

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  • Treatment and reuse method of waste water in methanol-to-olefin process
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Embodiment 1

[0054] Use the waste heat boiler to cool the effluent material of the MTO reactor at a temperature of 490°C to 190°C. Next, use water to directly cool the temperature of the MTO reactor effluent in the primary separation tower to reduce the temperature to 120°C. The water volume of the high-concentration MTO wastewater discharged after thermal cooling is 10% of the water volume generated by the MTO reaction.

[0055]In the secondary separation tower, continue to use water direct cooling to cool the effluent material of the MTO reactor that has separated high-concentration MTO wastewater. The cooling temperature is controlled at 118°C, so that most of the water and olefin gas are separated. In the separation tower The water phase is obtained at the bottom of the tower, and the olefin gas is obtained at the top of the separation tower. Part of the water phase at the bottom of the separation tower is cooled by heat exchange and used as cooling water for the effluent from the MTO ...

Embodiment 2

[0062] Use the waste heat boiler to cool the effluent material of the MTO reactor at a temperature of 460°C to 160°C. Next, use water to directly cool the temperature of the MTO reactor effluent in the primary separation tower to reduce the temperature to 115°C. The water volume of the high-concentration MTO wastewater discharged after thermal cooling is 20% of the water volume generated by the MTO reaction.

[0063] In the secondary separation tower, continue to use water direct cooling to cool the effluent material of the MTO reactor that has separated high-concentration MTO wastewater. The cooling temperature is controlled at 112°C, so that most of the water is separated from the olefin gas. In the separation tower The water phase is obtained at the bottom of the tower, and the olefin gas is obtained at the top of the separation tower. Part of the water phase at the bottom of the separation tower is cooled by heat exchange and used as cooling water for the effluent from the...

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Abstract

The invention relates to a treatment and reuse method of waste water in a methanol-to-olefin (MTO) process. The method comprises the following steps: (1) an effluent from an MTO reactor is subjected to the waste heat recovery through a waste heat boiler and then cooled and separated through a separation tower to generate high concentration MTO waste water; (2) the effluent from the MTO reactor is further cooled, a water phase is generated at the bottom of the separation tower, an olefin gas is generated at the top of the separation tower, and the olefin gas is further purified by compression and water scrubbing; (3) the water phase from the bottom of the separation tower and a water phase from bottom of a water scrubbing tower are treated by steam stripping, and a water phase generated at the bottom of a steam stripping tower is cooled through a tower bottom heat exchanger to generate low concentration MTO water; (4) the low concentration MTO water is homogenized; (5) the low concentration MTO water is subjected to the coagulating sedimentation treatment after the homogenization; (6) the low concentration MTO water is subjected to the aerobic aeration treatment after the coagulating sedimentation treatment; (7) the effluent water is settled after the aerobic aeration treatment; and (8) the effluent water is subjected to the flocculation filtration treatment after the settlement. The method can not only reduce the consumption of the fresh water in the MTO production, but also reduce the discharge of pollutants to the environment in the MTO production.

Description

technical field [0001] The invention relates to a treatment and reuse method for wastewater from an oxygenate-to-olefins process, in particular to a treatment and reuse method for wastewater from a 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. In recent years, the Oxygenate-to-Olefins (OTO) process, especially the Methanol-to-Olefins (MTO) process has become increasingly mature, and is expected to start large-scale application in the short term. [0003] The chemical reaction equation and thermal effect of producing ethylene and propylene from methanol are: [0004] 2CH 3 OH→C 2 h 4 +2H 2 O (ΔH=11.72KJ / mol, 427°C) [0005] 3CH 3 OH→C 3 h 6 +3H 2 O (ΔH=...

Claims

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Application Information

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IPC IPC(8): C02F9/14C07C11/02C07C1/20C02F1/52C02F3/12C02F1/20
CPCY02P20/10Y02W10/10
Inventor 程学文莫馗李正琪纪然周霖栾金义刘正万国晖杨永强
Owner CHINA PETROLEUM & CHEM CORP
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