Device for treating oxidized tail gas in hydrogen peroxide production

Abstract

A device for treating oxidized tail gas in hydrogen peroxide production comprises an oxidized tail gas collecting pipe (1), at least two sets of resin tanks (2) which are connected in parallel and are communicated with the oxidized tail gas collecting pipe (1), a tail gas discharging pipe (3) communicated with the resin tanks (2), a steam pipe (4) communicated with the resin tanks (2), a desorbed matter recycling pipe (5) communicated with the resin tanks (2), and a cooler (6) communicated with the desorbed matter recycling pipe (5), the layering tank (7) is communicated with the cooler (6), the aromatic hydrocarbon recovery tank (8) is connected with the layering tank (7), the wastewater tank (9) is connected with a wastewater outlet of the layering tank (7), the compressed air pipe (10) is communicated with the resin tank (2), the cooling water tank (11) is communicated with the cooler (6), and the cooling water pump (12) is communicated with the cooling water tank (11). And the resin tank (2) is communicated with an outlet of the cooling water pump (12). The technical scheme provided by the utility model is high in adsorption efficiency and stable in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen peroxide production, in particular to a device for treating oxidation tail gas in hydrogen peroxide production. Background Art

[0002] Hydrogen peroxide aqueous solution, also known as hydrogen peroxide, is an important raw material for the production of peroxides such as peracetic acid and thiourea peroxide. It is widely used in industries such as medicine, textile printing and dyeing, and paper bleaching. High-concentration hydrogen peroxide is a strong oxidizing and unstable liquid. At room temperature, it is a transparent, colorless liquid with a pungent odor and a viscosity slightly greater than that of water. It is a Class A fire hazard, primarily due to its combustion-supporting properties and its ability to readily decompose to produce water and oxygen.

[0003] At present, hydrogen peroxide production mainly adopts the anthraquinone method. Aromatic hydrocarbons are a major chemical raw material in hydrogen peroxide production, and their consumption accounts for a considerable proportion of the production cost of hydrogen peroxide. With the continuous rise in the market price of aromatic hydrocarbons, how to effectively reduce the consumption of aromatic hydrocarbons has become a common issue facing hydrogen peroxide manufacturers. At the same time, as aromatic hydrocarbons are a highly volatile toxic and harmful substance, reducing their emissions is also a requirement of national environmental protection policies.

[0004] Most of the domestic hydrogen peroxide production plants use condensation sedimentation adsorption to recover the aromatic hydrocarbons in the exhaust gas. However, after condensation (10-20°C), the aromatic hydrocarbon content in the exhaust gas is still as high as 2800-3000 mg / m 3 Recycling this part of aromatics will reduce the production cost of hydrogen peroxide on the one hand, and meet environmental protection requirements on the other. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a device for treating oxidation tail gas in hydrogen peroxide production, which can improve the adsorption efficiency and be more stable during operation.

[0006] In order to solve the above technical problems, the utility model provides a device for treating oxidation tail gas in hydrogen peroxide production, comprising an oxidation tail gas collection pipe, at least two sets of resin tanks connected in parallel, the air inlets of which are both connected to the oxidation tail gas collection pipe, an exhaust pipe connected to the resin tank, a steam pipe connected to the resin tank, a desorbent recovery pipe connected to the resin tank, a cooler whose first medium inlet pipe is connected to the desorbent recovery pipe, a stratification tank connected to the first medium outlet of the cooler, an aromatic hydrocarbon recovery tank connected to the organic matter outlet of the stratification tank through a pipeline, a wastewater tank connected to the wastewater outlet of the stratification tank through a pipeline, a compressed air pipe connected to the resin tank, a cooling water trough whose water inlet is connected to the first medium outlet of the cooler, and a cooling water pump whose liquid inlet is connected to the cooling water trough; the resin tank is connected to the outlet of the cooling water pump.

[0007] As a further improved technical solution, the utility model provides a device for treating oxidation tail gas in hydrogen peroxide production, wherein the exhaust ports of the stratification tank, aromatics recovery tank, wastewater tank and cooling water tank are all connected to the vortex air pump.

[0008] As a further improved technical solution, the utility model provides a device for treating oxidation tail gas from hydrogen peroxide production, wherein the cooling water tank also has a supplementary water pipe, which is connected to the water supply system; the outlet of the cooling water pump also has a bypass pipe connected to the wastewater pool.

[0009] The technical solution provided by the utility model can effectively remove aromatic hydrocarbons in tail gas, has high adsorption efficiency, high recovery rate, and is more stable during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0011] Figure 1 This is a structural diagram of an apparatus for treating oxidation tail gas from hydrogen peroxide production according to an embodiment. Implementation Method

[0012] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0013] like Figure 1 The device for treating oxidation tail gas from hydrogen peroxide production shown includes an oxidation tail gas collection pipe 1, three sets of resin tanks 2 connected in parallel, each with its air inlet connected to the oxidation tail gas collection pipe 1, an exhaust gas discharge pipe 3 connected to the resin tank 2, a steam pipe 4 connected to the resin tank 2, a desorbed material recovery pipe 5 connected to the resin tank 2, a cooler 6 with a first medium inlet pipe connected to the desorbed material recovery pipe 5, a stratification tank 7 connected to the first medium outlet of the cooler 6, an aromatics recovery tank 8 connected to the organic matter outlet of the stratification tank 7 via a pipeline, a wastewater tank 9 connected to the wastewater outlet of the stratification tank 7 via a pipeline, a compressed air pipe 10 connected to the resin tank 2, a cooling water tank 11 with its water inlet connected to the first medium outlet of the cooler 6, and a cooling water pump 12 with its liquid inlet connected to the cooling water tank 11. The resin tank 2 is connected to the outlet of the cooling water pump 12. In this embodiment, the resin tank 2 uses styrene polymer resin.

[0014] As one example, based on the above, the exhaust ports of the stratification tank 7, aromatics recovery tank 8, wastewater tank 9, and cooling water tank 11 of a device for treating oxidation tail gas from hydrogen peroxide production are all connected to a vortex air pump (not shown). The vortex air pump centrally exhausts volatile gases from the stratification tank 7, aromatics recovery tank 8, wastewater tank 9, and cooling water tank 11, improving the production workshop environment.

[0015] As one embodiment, based on the above, the cooling water tank of the device for treating oxidation tail gas from hydrogen peroxide production further includes a make-up water pipe 13 connected to the water supply system. The outlet of the cooling water pump 12 also includes a bypass pipe 14 connected to the wastewater tank. Excess cooling water in the cooling water tank 11 is sent to the wastewater treatment equipment for treatment.

[0016] Each pipeline is equipped with a valve for controlling the switching process, which is known to those skilled in the art and will not be described in detail in the present invention.

[0017] The working states included in the production process of the resin tank 2 include: adsorption state, regeneration state and waiting state.

[0018] When three sets of resin tanks 2 are connected in parallel, two sets of resin tanks 2 are used in the adsorption state during production, two sets of resin tanks 2 are used in parallel, and the remaining set of resin tanks 2 is in the regeneration state or waiting state. Each set of resin tanks 2 can switch between the adsorption state and the regeneration state. After a certain period of operation in the adsorption state or when the adsorption effect is detected to be reduced, the regeneration state is switched.

[0019] Adsorption state: The oxidation tail gas condensed at a temperature of 10-20°C is introduced into the bottom of the resin tank 2 under positive pressure, and the gas adsorbed by the resin is discharged into the atmosphere from the top of the resin tank 2. During the adsorption operation, the exhaust gas outlet is guaranteed to meet the emission standards.

[0020] Regeneration Phase: After the resin in resin tank 2 reaches saturation, steam is used for column regeneration. Steam enters from the top of the regenerated resin tank 2, flowing in the opposite direction of the oxidation off-gas. The regenerated effluent is cooled and condensed by cooler 6 before entering the stratification tank 7. After steam regeneration, the control valve on compressed air line 10 is opened to purge the regenerated resin tank 2. The purge gas and liquid are cooled by cooler 6 and then enter the stratification tank 7. The control valve on compressed air line 10 is closed after the purge is complete. After the purge is complete, the cooling water pump 12 is opened to cool the regenerated resin tank 2. Cooling water enters from the top of the regenerated resin tank 2, flowing in the opposite direction of the oxidation off-gas. The effluent water is cooled by cooler 6 and then enters the cooling water tank 11. The control valve on compressed air line 10 is opened again to purge the regenerated resin tank 2. The purge gas and liquid are cooled by cooler 6 and then enter the cooling water tank 11. The control valve on compressed air line 10 is closed after the purge is complete. After the purge is completed, the resin tank enters the waiting state.

[0021] The technical solution provided by the utility model can effectively remove aromatic hydrocarbons in tail gas, has high adsorption efficiency, high recovery rate, and is more stable during operation.

[0022] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for treating oxidation tail gas in hydrogen peroxide production, comprising an oxidation tail gas collection pipe (1), at least two sets of resin tanks (2) connected in parallel and having air inlets both connected to the oxidation tail gas collection pipe (1), a tail gas discharge pipe (3) connected to the resin tank (2), a steam pipe (4) connected to the resin tank (2), a desorbed product recovery pipe (5) connected to the resin tank (2), a cooler (6) having a first medium inlet pipe connected to the desorbed product recovery pipe (5), a stratification tank (7) connected to the first medium outlet of the cooler (6), an aromatic hydrocarbon recovery tank (8) connected to the organic matter outlet of the stratification tank (7) through a pipeline, and a wastewater tank (9) connected to the wastewater outlet of the stratification tank (7) through a pipeline, characterized in that: It also includes a compressed air pipe (10) connected to the resin tank (2), a cooling water tank (11) whose water inlet is connected to the first medium outlet of the cooler (6), and a cooling water pump (12) whose liquid inlet is connected to the cooling water tank (11); the resin tank (2) is connected to the outlet of the cooling water pump (12).

2. The device for treating oxidation tail gas from hydrogen peroxide production according to claim 1, characterized in that: The exhaust ports of the stratification tank (7), the aromatics recovery tank (8), the wastewater tank (9) and the cooling water tank (11) are all connected to the vortex air pump.

3. The device for treating oxidation tail gas from hydrogen peroxide production according to claim 1, characterized in that: The cooling water tank (11) further comprises a supplementary water pipe (13), and the supplementary water pipe (13) is connected to a water supply system; the outlet of the cooling water pump (12) further comprises a bypass pipe (14) connected to a wastewater tank.

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