Recycling method of hydrogen peroxide oxidized tail gas

Abstract

The invention relates to a recycling method of hydrogen peroxide oxidized tail gas. The recycling method comprises the following steps of: (a) cooling the oxidized tail gas with the temperature of about 50 DEG C to 25-28 DEG C by virtue of a cold box and a cooler, introducing the oxidized tail gas into separators 1# and 2#, separating heavy aromatic hydrocarbon, returning the oxidized tail gas to the cold box, heating to 30-35 DEG C, and introducing the oxidized tail gas into an expansion refrigeration generator set for power generation; (c) after the power generation acting of the oxidized tail gas through an expansion machine, cooling to 0-5 DEG C, introducing the oxidized tail gas into a separator 3#, discharging oxidized tail gas into a low-temperature water generator to exchange heat with freeze inlet water so as to obtain freeze outlet water with a low temperature of 5-10 DEG C for other use, and evacuating residual oxidized tail gas; and (d) recycling heavy aromatic hydrocarbon liquid separated from the separators 1#, 2# and 3# into a system. According to the recycling method, the cooling capacity of outlet gas of the expansion machine is recycled by virtue of the low-temperature water generator; the cold box is used for cooling high-temperature oxidized tail gas, heating cooled low-temperature oxidized tail gas, heavy aromatic hydrocarbon in the oxidized tail gas is recycled, and the pressure and the internal energy of the oxidized tail gas are adequately utilized for carrying out expansion refrigeration for power generation, so that the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of anthraquinone hydrogen peroxide production technology, and particularly relates to a method and a device for recovering and utilizing oxidation tail gas. Background technique [0002] The oxidation process of hydrogen peroxide production by anthraquinone method is to pump the hydrogenated working fluid into the bottom of the oxidation tower, and at the same time introduce fresh air from the bottom of the oxidation tower, and disperse it through the disperser, and then enter the hydrogenation working fluid and air at the bottom of the oxidation tower Flow upward together; the gas separated by the built-in separator at the upper part of the oxidation tower is also called oxidation tail gas. The pressure at the top of the oxidation tower is generally controlled at 0.2-0.25Mpa, and the oxidation temperature is generally controlled at 45-50°C, so the state of the oxidation tail gas is 0.2 —0.25Mpa, 45-50°C. The main co...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a hydrogen peroxide oxidation tail gas recovery and utilization method and device in order to solve the defects of low oxidation tail gas recovery and utilization rate in the existing anthraquinone method hydrogen peroxide production technology

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