CN219399299U - Hydrogen peroxide solution apparatus for producing waste water recycle system - Google Patents

Abstract

The utility model provides a wastewater recycling system of a hydrogen peroxide production device, which belongs to a wastewater recycling system and comprises a wastewater recycling tank, a filter and a phase separator, wherein an inlet of the wastewater recycling tank is connected with a wastewater collecting pipe, an oil phase outlet is arranged at the upper part of the wastewater recycling tank, a water phase outlet is arranged at the bottom of the wastewater recycling tank, the water phase outlet is connected to an inlet of the filter, and the outlet of the filter is connected to an inlet of the phase separator. The utility model can recycle the water resources in heavy aromatic hydrocarbon and overflow water, control the wastewater production and save the water resources.

Description

Hydrogen peroxide solution apparatus for producing waste water recycle system

Technical Field

The utility model relates to a wastewater recycling system, in particular to a wastewater recycling system of a hydrogen peroxide production device.

Background

The production process of the anthraquinone method hydrogen peroxide is a process of obtaining 27.5-30% hydrogen peroxide solution by taking 2-ethyl anthraquinone as a carrier, heavy aromatic hydrocarbon, trioctyl sulfate, tetrabutyl urea and the like as solvents and through hydrogenation, oxidation, extraction purification and regeneration units. The extraction task is to use acid water as an extractant in an extraction tower, obtain a hydrogen peroxide solution with a certain concentration at the bottom of the extraction tower, and obtain working solution at the top of the extraction tower, thereby realizing the separation of the hydrogen peroxide solution and the working solution. The acidic water is from a pure water tank and is conveyed to the top of the extraction tower through a pump, and the water consumption per hour is about 33 tons by taking a 30-ten thousand ton hydrogen peroxide production device as an example (the same applies below).

In the production process, wastewater is inevitably generated due to the reasons of system pollution discharge, material removal, alumina desorption regeneration and the like. The wastewater yield is 2-2.5m ³ And/h, 20000 tons of wastewater are produced annually. The average COD in the wastewater is about 3000mg/L, the COD of partial wastewater is more than 5000mg/L, and the wastewater also contains components such as phosphorus, salt, solid particles and the like. The common treatment process of the wastewater generated in the hydrogen peroxide production process is oil separation, dephosphorization, fenton method and biochemical treatment, and has long process route and high treatment cost.

Analysis of wastewater sources

1. The carbon fiber adsorption equipment is used for adsorbing heavy aromatic hydrocarbon in the oxidized tail gas so as to enable the heavy aromatic hydrocarbon to reach the standard for emission. The carbon fiber needs vapor desorption recovery after absorbing heavy aromatic hydrocarbon in tail gas, desorption liquid is cooled and layered, the heavy aromatic hydrocarbon obtained from the upper layer is recovered to the system for recycling, and condensate obtained from the lower part is discharged into a wastewater system. The wastewater production amount is about 12000 tons/year, accounting for 48 percent of the total wastewater.

2. And the overflow water of each water seal is poured by equipment such as an oxidation tail gas cooler, a vacuum pump and the like. The waste water contains a small amount of working fluid components, and the majority of the waste water is water phase. And the oil phase at the upper layer enters a preparation kettle for cleaning and recycling, and the water phase at the lower layer is discharged into a sewage system. The water phase and the oil phase generated by layering are washed, the waste water amount generated by washing is 1000 tons/year, and the waste water amount accounts for 5% of the total waste water.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a wastewater recycling system of a hydrogen peroxide production device, which is used for recycling water resources in heavy aromatic hydrocarbon and overflow water, controlling the generation amount of wastewater and enhancing the recycling process.

In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a hydrogen peroxide solution apparatus for producing waste water recycle system, includes waste water recovery tank, filter and phase separator, waste water recovery tank entry linkage waste water collecting pipe, and waste water recovery tank upper portion is equipped with the oil phase export, and waste water recovery tank bottom is equipped with the aqueous phase export, and the aqueous phase export is connected to the filter entry, and the filter exit is connected to the phase separator entry.

Further, the outlet of the phase separator is provided with an on-line analysis instrument.

Further, the filter adopts a vertical filter or a horizontal filter, and a filter element with the filter precision of 2-3 μm is arranged in the filter.

Further, the phase separator comprises an oil-water mixed phase inlet, a liquid drop multiplication section, a sedimentation section, an oil phase outlet and a water phase outlet, wherein the oil-water mixed phase inlet is connected with the filter outlet, the liquid drop multiplication section and the sedimentation section are sequentially arranged in the phase separator along the direction from the oil-water mixed phase inlet to the oil phase outlet or the water phase outlet, the oil phase outlet is positioned at the upper part of the phase separator, the water phase outlet is positioned at the bottom of the phase separator, and a coalescing inner core is arranged in the liquid drop multiplication section.

Further, the coalescing core is a fibrous media.

Further, the aqueous phase outlet of the wastewater recovery tank is connected to the filter inlet by a pump.

The utility model has the beneficial effects that: according to the utility model, wastewater recycling is realized through the wastewater recycling tank, the filter and the phase separator, the wastewater recycling tank performs primary recycling, static layering is performed in the wastewater collecting tank, the upper oil phase enters the working solution collecting tank through the oil phase outlet, the lower water phase enters the filter, impurities and flocculent degradants in the water are filtered, and the filter can not only filter the impurities, but also reduce the burden of the phase separator. The filtered water-oil mixture enters a phase separator for further oil-water separation, so that the oil-water separation effect is enhanced. By the device, the waste water amount of the hydrogen peroxide production device is reduced by more than 50%, and water resources are saved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a phase separator;

in the figure: 1. the device comprises a wastewater recovery tank 2, a pump 3, a filter 4, a phase separator 5, an oil-water mixed phase inlet 6, a liquid drop multiplication section 7, a sedimentation section 8, an oil phase outlet 9 and a water phase outlet.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and specific examples.

Example 1

The utility model will be further described with reference to the drawings and the specific examples.

Example 1

The embodiment discloses hydrogen peroxide production plant waste water recycle system, as shown in fig. 1, including waste water recovery tank 1, filter 3 and phase separator 4, waste water recovery tank 1 entry linkage waste water collecting pipe for let in heavy aromatic hydrocarbon and overflow water, waste water recovery tank 1 upper portion is equipped with the oil phase export, and waste water recovery tank 1 bottom is equipped with the aqueous phase export, and the aqueous phase export is connected to filter 3 entry through pump 2, and filter 3 exit linkage is to phase separator 4 entry.

During operation, heavy aromatic hydrocarbon and overflow water are uniformly collected into a wastewater collection tank 1, static layering is carried out in the wastewater collection tank 1, an upper oil phase enters a working solution collection tank, and the wastewater is returned to a system for reuse after being washed by a preparation kettle; the lower water phase is conveyed to a filter 4 by a pump 2, impurities and flocculent degradation products in the filtered water are further separated by oil and water in the phase separator 4, the oil phase overflows from the top of the phase separator 4 and enters a working solution collecting tank, the bottom water phase enters a pure water tank, and the pure water enters an extraction tower together with fresh desalted water to be used as an extractant of the extraction tower. In order to ensure the quality of the reclaimed water, an online analysis instrument such as a conductivity meter is arranged at the outlet of the phase separator 4, and the quality of the reclaimed water is concerned. At the initial stage of feeding and driving of the device, because the pipeline and the equipment have impurity risks, the wastewater at the moment is not recommended to be recovered and is still directly returned to the wastewater system. And after the device is stable in production and the system is thoroughly cleaned, water is recovered.

The filter is a vertical filter, a horizontal filter can be selected according to the installation space, and a filter element with the filtering precision of 2-3 mu m is arranged in the filter and is used for filtering impurities such as degraded floccules, solid particles, carbon fiber felt shedding matters and the like in the wastewater, so that the effect of purifying water quality is achieved. Because the fiber coalescence material is compact and is easy to be blocked by solid particles, the service life is influenced, and the filter also plays a role in protecting the coalescer.

As shown in fig. 2, the phase separator 4 comprises an oil-water mixed phase inlet 5, a liquid drop multiplication section 6, a sedimentation section 7, an oil phase outlet 8 and an aqueous phase outlet 9, wherein the oil-water mixed phase inlet 5 is connected with the outlet of the filter 3, the liquid drop multiplication section 6 and the sedimentation section 7 are sequentially arranged in the phase separator along the direction from the oil-water mixed phase inlet 5 to the oil phase outlet 8 or the aqueous phase outlet 9, the oil phase outlet 8 is positioned at the upper part of the phase separator 4, the aqueous phase outlet 9 is positioned at the bottom of the phase separator 4, and a coalescing inner core is arranged in the liquid drop multiplication section 6. In this embodiment, the coalescing core is a fibrous media.

The phase separator 4 is internally provided with a coalescing inner core for further separating an oil phase and a water phase in the wastewater, a purer water phase is obtained at the bottom of the phase separator 4, and the water phase is conveyed to a pure water tank to replace pure water to be used as an extractant of an extraction tower, so that waste is changed into valuable, and better economic benefit and environmental protection benefit are realized. The oil phase obtained from the upper part of the phase separator 4 enters a working solution recovery tank, and enters a preparation kettle together with the working solution recovered by other equipment in the device, and returns to the system for reuse after being washed to be qualified.

Upper coalescence-separation principle of phase separator 4: the separation of the liquid-liquid phase is in fact the process of coalescence and separation of the dispersed phase droplets in the continuous phase. The coalescing process can be divided into three stages:

the first stage: and (3) capturing liquid drops. The dispersed phase droplets are in contact with the fibers continuously in the movement process, and the inner layered structure is formed due to different fiber diameters and lengths of the fiber media, so that the droplets are trapped.

The second stage: the droplets coalesce. After completion of the droplet collection, the droplet coalescing stage is the most important stage in the overall coalescence process, and the collected droplets collide and coalesce with each other along the fiber direction under the pushing of the fluid, so that the coalescence becomes large. As shown in fig. 1. The coalesced liquid moves along the filaments under the force of the fluid, and as the diameter of the droplets increases, the droplets fall off, preferably under the force of gravity or buoyancy.

Third stage: the droplets settle. The enlarged liquid drops fall off from the coalescing media, start to subside or rise under the action of self gravity or buoyancy, reach the dispersed phase collecting area and are discharged from the collecting area, so that two-phase separation is realized.

The system of the embodiment can reduce the wastewater amount of the hydrogen peroxide production device by more than 50%, change waste into valuable, save water resources and create benefits.

While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that the utility model is not limited to the particular embodiments, but is capable of numerous modifications and variations within the spirit and scope of the utility model.

Claims (6)

1. The utility model provides a hydrogen peroxide solution apparatus for producing waste water recycle system which characterized in that: the device comprises a wastewater recovery tank, a filter and a phase separator, wherein an inlet of the wastewater recovery tank is connected with a wastewater collecting pipe, an oil phase outlet is arranged at the upper part of the wastewater recovery tank, a water phase outlet is arranged at the bottom of the wastewater recovery tank, the water phase outlet is connected to an inlet of the filter, and the outlet of the filter is connected to an inlet of the phase separator.

2. The hydrogen peroxide production device wastewater recycling system according to claim 1, wherein: the outlet of the phase separator is provided with an on-line analysis instrument.

3. The hydrogen peroxide production device wastewater recycling system according to claim 1, wherein: the filter adopts a vertical filter or a horizontal filter, and a filter element with the filter precision of 2-3 μm is arranged in the filter.

4. The hydrogen peroxide production device wastewater recycling system according to claim 1, wherein: the phase separator comprises an oil-water mixed phase inlet, a liquid drop multiplication section, a sedimentation section, an oil phase outlet and a water phase outlet, wherein the oil-water mixed phase inlet is connected with the filter outlet, the liquid drop multiplication section and the sedimentation section are sequentially arranged in the phase separator along the direction from the oil-water mixed phase inlet to the oil phase outlet or the water phase outlet, the oil phase outlet is positioned at the upper part of the phase separator, the water phase outlet is positioned at the bottom of the phase separator, and a coalescing inner core is arranged in the liquid drop multiplication section.

5. The hydrogen peroxide production plant wastewater recycling system according to claim 4, wherein: the coalescing core is a fibrous media.

6. The hydrogen peroxide production device wastewater recycling system according to claim 1, wherein: the aqueous phase outlet of the wastewater recovery tank is connected to the filter inlet by a pump.