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System and method for treating and recycling methanol aromatization wastewater

An aromatization and wastewater technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of increasing treatment costs, high organic content, and reducing the dosage of chemicals Effect

Active Publication Date: 2014-11-19
HUADIAN COAL IND GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 3. Wastewater contains certain acidic organic matter
At the same time, the methanol-to-aromatics wastewater does not contain other elements such as nitrogen and phosphorus, but has a high content of organic matter. Therefore, if a simple and conventional biological treatment method is used in the wastewater treatment process, a large amount of nutrients such as nitrogen and phosphorus will be added. Increase the cost of treatment, and at the same time need to deal with excess nitrogen and phosphorus in the follow-up process

Method used

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  • System and method for treating and recycling methanol aromatization wastewater

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Experimental program
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Effect test

Embodiment 1

[0055]The product of methanol to aromatics process is cooled step by step to the gas, liquid and liquid three-phase separator, then enters the top of the separation tower to obtain gas phase hydrocarbons, the middle part of the separator produces oil phase substances, and the bottom of the separation tower to obtain the water phase, and the separation tower The water phase at the bottom enters the catalyst settler. After removing the solid catalyst particles, part of it is used for cooling water for MTO materials through heat exchange and cooling, and the rest enters the single stripping tower for treatment.

[0056] The temperature at the bottom of the stripper is controlled at 110°C, and the methanol content in the effluent from the bottom of the stripper is controlled below 300mg / L. The water phase produced from the bottom of the stripper is further cooled and used as the outlet of the methanol-to-aromatics reactor The material is cooled with water, and the rest continues to...

Embodiment 2

[0064] After the products of methanol to aromatics process are cooled step by step to the gas, liquid and liquid three-phase separator, gas phase hydrocarbons are obtained from the top of the separation tower, oil phase substances are produced in the middle of the separator, water phase is obtained from the bottom of the separation tower, and water phase is obtained from the bottom of the separation tower The water phase enters the solid-liquid separator, and after removing the solid catalyst particles, part of it is used as cooling water for the MTO material after heat exchange and cooling, and the remaining part enters the stripping device composed of two stripping towers for treatment.

[0065] The water phase from the bottom of the stripper is stripped. The temperature at the bottom of the first stripper is controlled at 105°C, the temperature at the bottom of the second stripper is controlled at 115°C, and the effluent from the bottom of the stripper The methanol content i...

Embodiment 3

[0073] After the products of methanol to aromatics process are cooled step by step to the gas, liquid and liquid three-phase separator, gas phase hydrocarbons are obtained from the top of the separation tower, oil phase substances are produced in the middle of the separator, water phase is obtained from the bottom of the separation tower, and water phase is obtained from the bottom of the separation tower The water phase enters the precision filter, and after removing the solid catalyst particles, part of it is used as cooling water for MTO materials through heat exchange and cooling, and the rest enters a single stripping tower for treatment.

[0074] The water phase from the bottom of the stripper is stripped, the temperature at the bottom of the stripper is controlled at 108°C, the methanol content in the effluent from the bottom of the stripper is controlled below 300mg / L, and the product produced from the bottom of the stripper is The water phase out is passed through the ...

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Abstract

The invention provides a system and a method for treating and recycling methanol aromatization wastewater and belongs to a wastewater treatment method of a chemical process. After the methanol aromatization wastewater is subjected to phase separation by use of a gas-liquid-liquid three-phase separator, the wastewater is orderly treated by a particle removing device, a wastewater gas stripping device, a gravity oil removing device and an air floatation device so that petroleum materials in the wastewater can be removed, next, the wastewater is homogenized and then treated by an anaerobic treatment system and an aerobic treatment system so that organic matters in the wastewater can be further removed, and then the wastewater is flocculently precipitated and filtered so that the wastewater can be up to the reuse standard. The method is capable of effectively recycling most wastewater and reducing the usage amount of fresh water; compared with the conventional process, the inventory is reduced by more than 50% in the whole wastewater treatment process, and the wastewater treatment cost is low.

Description

technical field [0001] The invention relates to a system and method for the treatment and reuse of methanol aromatization wastewater. Background technique [0002] Aromatics is an important basic raw material in the modern chemical industry. Traditionally, aromatics mainly come from petroleum processing, and its raw material is mainly naphtha. In recent years, the process of producing aromatics from oxygenates, especially the process of producing aromatics from methanol\dimethyl ether has become increasingly popular. It is mature and is expected to complete industrial application in recent years. [0003] The equation and thermal effect of producing aromatics from methanol raw materials are shown in the table below. It can be seen that the process of producing aromatics from methanol is a highly exothermic process, and the amount of sewage generated in the process is large, and the amount of water generated accounts for 56.25% of the total amount of raw materials. Therefore...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 崔宇汤效平王彤骞伟中魏飞高长平丁焕德
Owner HUADIAN COAL IND GRP
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