Concentrated water treatment device for methanol-to-olefin

By designing a wastewater stripping system and a concentrated water treatment system, the problems of grease formation and heat exchanger blockage caused by aldehydes and ketones in the concentrated water were solved, resulting in improved water purification quality and reduced operating costs.

CN224430264UActive Publication Date: 2026-06-30TIANJIN BOHUA CHEM DEV CO LTD
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Patent Information

Application Number
CN202521021965.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-22
Publication Date
2026-06-30
Estimated Expiration
2035-05-22

AI Technical Summary

Technical Problem

In the process of methanol-to-olefins, the presence of aldehydes and ketones in the concentrated water leads to problems such as increased butter production, heat exchanger blockage, and slagging in the gasifier, which are difficult to solve effectively with existing technologies.

Method used

An apparatus comprising a wastewater stripping system, a concentrated water recycling system, and a concentrated water treatment system was designed. The concentrated water is treated through steps such as reboiler heating, gas-liquid separation, and incineration to reduce aldehydes and ketones, thereby reducing the risk of butter formation and blockage.

Benefits of technology

It effectively reduced the amount of grease generated in the separation unit, reduced heat exchanger blockage and gasifier slagging, and improved the economic efficiency of the equipment and the quality of purified water.

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Abstract

The utility model discloses a concentrated water treatment device for methanol-to-olefin, and belongs to the technical field of methanol-to-olefin. The concentrated water treatment device consists of a sewage steam stripping system, a concentrated water recycling system and a concentrated water treatment system; the sewage steam stripping system consists of a water mixing tank, a sewage feeding pump, a feeding and discharging heat exchanger, a sewage steam stripping tower, a reboiler and a purified water pump, the concentrated water recycling system consists of a cooler, a reflux tank and a concentrated water reflux pump, and the concentrated water treatment system consists of a concentrated water storage tank, a miscellaneous oil tank and a miscellaneous oil delivery pump. The concentrated water treatment system is additionally arranged, concentrated water is treated and then returns to the system to be continuously refined, generated miscellaneous oil is sent out, and the economical efficiency of the device is improved; the system flow of the sewage stripping tower is optimized, the stripping effect of the sewage stripping tower is ensured, and the energy consumption is also reduced; after concentrated water is treated, the quality of purified water is ensured, and the water demand of a downstream device is met; the butter generation amount of an alkaline washing tower of a separation unit is reduced, and the injection amount of a butter inhibitor is indirectly reduced.
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