Method for recycling hydrogen peroxide oxidized tail gas

Abstract

The invention discloses a method for recycling hydrogen peroxide oxidized tail gas. The device comprises an absorption tower, a liquid-rich tank, a stripping tower, a separator, a recycling tank, a rectifying column and a refining tank which are sequentially connected through a pipeline. The device is further provided with a barren liquid tank, a discharging port of the barren liquid tank is connected to the absorption tower, the stripping tower and the rectifying column are provided with pipelines to be connected to a feeding port of the barren liquid tank, and an evacuation pipeline is arranged at the top of the absorption tower. An adsorption tank is arranged at the top of the absorption tower, and the adsorption tank is filled with carbon fibers. The method can be applied to the oxidized tail gas treatment process during hydrogen peroxide production, arene is recycled from the oxidized tail gas, the raw material consumption of the device is reduced, meanwhile, energy consumption can be reduced, and environmental protection can be achieved.

Description

Technical field [0001] The invention relates to the technical field of chemical waste gas recovery and utilization, in particular to a separation and recovery device for oxidized tail gas aromatic hydrocarbons in hydrogen peroxide production. Background technique [0002] The tail gas in hydrogen peroxide production comes from the oxidation tower. The tail gas contains a lot of aromatic hydrocarbons. The aromatic hydrocarbons are highly volatile and easily run away with the gas phase. The aromatic hydrocarbons are benzene substances. If they are not recovered in time, they will seriously pollute the environment. The general treatment method is to first condense most of the aromatics gas through a heat exchanger, and then use the pressure of the oxidized tail gas as power, cool down by the expansion unit, and further condense and recover the heavy aromatics in the tail gas, and then directly adsorb it through activated carbon fibers. Vent. This method requires regular replacement...

AI Technical Summary

Problems solved by technology

The carbon fibers in this method need to be replaced regularly, the steam consumption is high, the operation and maintenance costs are high, and the content of aromatics in the exhaust tail gas fluctuates greatly. The recovery capacity for exhaust gas with high aromatics content is limited, and the content of aromatics in the vented air is easy to exceed the standard, which affects the environment and wastes resources.

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