Waste acid treatment device in 2-ethyl anthraquinone production

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a waste acid treatment device in 2-ethyl anthraquinone production, which comprises a first reaction kettle, a first filter, a second reaction kettle, a second filter, a third reaction kettle, a third filter, an evaporation dryer and a crusher which are communicated in sequence, each of the first reaction kettle, the second reaction kettle and the third reaction kettle is provided with a stirring device, a solid material feeding hole and a liquid material feeding hole; a filtrate outlet of the first filter is communicated to a liquid feed port of the first reaction kettle through a first filtrate storage tank, a filtrate outlet of the second filter is communicated to a feed port of the first filter through a second filtrate storage tank, and a filtrate outlet of the third filter is communicated to a liquid feed port of the third reaction kettle through a third filtrate storage tank. According to the utility model, the waste acid in the production of the existing 2-ethyl anthraquinone and the raw materials for treating the waste acid can be recycled after being treated, so that secondary pollution is avoided, and the economic benefit is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a waste acid treatment device in the production of 2-ethylanthraquinone. Background Art

[0002] 2-ethylanthraquinone is an important fine chemical product and an important working fluid in the production process of hydrogen peroxide. It also has wide applications in the dye industry, photocurable resins, and photosensitive polymerization. The current most commonly used production process at home and abroad for preparing 2-ethylanthraquinone uses phthalic anhydride, ethylbenzene, and aluminum trichloride as raw materials. The Friedel-Crafts acylation reaction occurs between phthalic anhydride and ethylbenzene under the action of aluminum trichloride to generate a complex salt of aluminum 2-ethylbenzoylbenzoate. It is hydrolyzed in an acidic aqueous solution to obtain 2-(4'-ethylbenzoyl)benzoic acid (abbreviated as "BE acid"). The obtained BE acid undergoes a ring closure reaction under the action of 20% oleum to generate 2-ethylanthraquinone. However, a large amount of waste acid containing organic waste is generated in this process, and the amount of waste acid discharged per ton of 2-ethylanthraquinone product is as high as about 10 tons.

[0003] Currently, methods such as activated carbon adsorption method, membrane separation method, biodegradation method, and catalytic oxidation method are commonly used to treat waste acid of anthraquinone compounds. However, in the activated carbon adsorption method, the activated carbon is prone to failure and subsequent treatment is difficult; the membrane separation method has a large investment and the membrane is prone to aging, and its industrial production application is not yet mature; the biodegradation method has a slow treatment speed and low efficiency; while the catalytic oxidation method has a low cost, high treatment efficiency, and is easy to be applied in industrial production, but the catalytic oxidation method has problems of waste of sulfuric acid resources and easy generation of secondary pollution. Therefore, it is still necessary to find new treatment methods and treatment devices that can solve the waste acid problem and generate certain economic benefits, which is the most ideal solution. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a waste acid treatment device in the production of 2-ethylanthraquinone, which overcomes the defects of the prior art. After treatment, the waste acid and its treatment raw materials in the existing production of 2-ethylanthraquinone can be reused, no secondary pollution is generated, and economic benefits are increased.

[0005] To solve the above technical problem, the technical solution of the utility model is:

[0006] A waste acid treatment device in the production of 2-ethylanthraquinone, comprising a first reaction kettle, a first filter, a second reaction kettle, a second filter, a third reaction kettle, a third filter, an evaporation dryer and a pulverizer connected in sequence; the first reaction kettle, the second reaction kettle and the third reaction kettle are all equipped with stirring devices, solid material feeding ports and liquid material feeding ports; the filtrate outlet of the first filter is connected to the liquid material feeding port of the first reaction kettle through a pipeline, a valve, a pump and a first filtrate storage tank, the filtrate outlet of the second filter is connected to the feeding port of the first filter through a pipeline, a valve, a pump and a second filtrate storage tank, and the filtrate outlet of the third filter is connected to the liquid material feeding port of the third reaction kettle through a pipeline, a valve, a pump and a third filtrate storage tank.

[0007] Preferably, the first filter, the second filter and the third filter are all XMY500 / 1500-U type plate and frame filter presses. The manufacturer is Jingjin Filter Press Group Co., Ltd.

[0008] Preferably, the first filter is also connected to a dilute sulfuric acid storage tank through a pipeline, a valve and a pump.

[0009] Preferably, the second filter is also connected to a washing water storage tank through a pipeline, a valve and a pump, and the washing water of the second filter is connected to an acid precipitation device in the production process through a pipeline, a valve and a pump.

[0010] Preferably, the evaporation dryer is an XSG type rotary flash dryer. The manufacturer is Changzhou Changqun Drying Equipment Co., Ltd.

[0011] Preferably, the pulverizer is connected to a packaging device through a conveying pipeline.

[0012] Preferably, the pulverizer is a JZL fluidized bed air classifier mill. The manufacturer is Sichuan Juzi Powder Equipment Co., Ltd.

[0013] Due to the adoption of the above technical solution, the beneficial effects of the present utility model are as follows:

[0014] The present utility model adsorbs and treats the waste acid in the production of 2-ethylanthraquinone by using the adsorbent activated carbon / diatomite. The organic matter (anthraquinone benzene ring compound) therein is adsorbed on the surface of the activated carbon and diatomite, and can be used for the modification of the activated carbon / diatomite. The modified activated carbon / diatomite has good reinforcing effect and can be used in rubber products; a small amount of impurities containing benzene sulfonic acid structure and a small amount of free sulfuric acid in the filter cake are treated by neutralization with calcium hydroxide to obtain the corresponding calcium salts; and the dilute sulfuric acid after adsorption treatment can be reused; therefore, through the treatment of the above device, the waste acid is turned into reusable dilute sulfuric acid, and at the same time, the activated carbon / diatomite used for adsorption not only does not need to be treated again, but also can produce new products, increasing economic benefits.

[0015] In summary, in the present utility model, the waste acid in the existing 2-ethylanthraquinone production and the raw materials used for its treatment can all be reused after treatment, without generating secondary pollution, and the economic benefits are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0018] Wherein, 1, the first reaction kettle; 2, the first filter; 3, the second reaction kettle; 4, the second filter; 5, the third reaction kettle; 6, the third filter; 7, the evaporation dryer; 8, the pulverizer; 9, the first filtrate storage tank; 10, the second filtrate storage tank; 11, the third filtrate storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0020] As Figure 1 shown, the present utility model is a waste acid treatment device in the production of 2-ethylanthraquinone, comprising a first reaction kettle 1, a first filter 2, a second reaction kettle 3, a second filter 4, a third reaction kettle 5, a third filter 6, an evaporation dryer 7 and a pulverizer 8 that are connected in sequence; the first reaction kettle 1, the second reaction kettle 3 and the third reaction kettle 5 are all provided with stirring devices (not marked), solid material feeding ports (not marked) and liquid material feeding ports (not marked); the filtrate outlet of the first filter 2 is connected to the liquid material feeding port of the first reaction kettle 1 through a pipeline (not marked), a valve (not marked), a pump (not marked) and a first filtrate storage tank 9, the filtrate outlet of the second filter 4 is connected to the feeding port of the first filter 2 through a pipeline, a valve, a pump and a second filtrate storage tank 10, and the filtrate outlet of the third filter 6 is connected to the liquid material feeding port of the third reaction kettle 5 through a pipeline, a valve, a pump and a third filtrate storage tank 11.

[0021] During actual production, in the first treatment, first, the prepared activated carbon / diatomite is loaded into the second reaction kettle 3 in proportion, and then the waste acid generated in the production is input into the second reaction kettle 3, and the stirring is started for the adsorption reaction. After the reaction is completed, the material is transported to the second filter 4 for pressure filtration and air blowing to obtain the second filter cake and the second filtrate;

[0022] The obtained second filter cake enters the third reactor 5, where calcium hydroxide and water are added for neutralization. The neutralized material enters the third filter press 6 for pressure filtration and air blowing, obtaining a third filter cake and a third filtrate. The third filter cake enters the drying machine 7 for drying and then enters the crusher 8 for crushing to obtain the preliminarily modified activated carbon / diatomite product, which can be sold as a finished product after further modification. The third filtrate is temporarily stored in the third filtrate storage tank 11 and then can be recycled to the third reactor 5 for continued utilization.

[0023] The obtained second filtrate is first recycled to the first reactor 1 for an adsorption reaction with the newly added activated carbon / diatomite. After the reaction is completed, the material is transported to the first filter press 2 for filtration. The first filtrate replaces the initial second filtrate and is recycled to the first reactor 1 for the adsorption reaction. The filter cake enters the second reactor 3, where new waste acid is added for adsorption. After the adsorption is completed, the material is transported to the second filter press 4 for pressure filtration and air blowing. The obtained filter cake enters the third reactor 5 for further processing in the downstream process. The obtained secondary filtrate is recycled to the first filter press 2 as a washing liquid, and after washing, it is collected for standby to obtain dilute sulfuric acid.

[0024] The subsequent operations are continuous. New activated carbon / diatomite and the first filtrate are added to the first reactor 1, and then the production process proceeds in sequence through the first reactor 1, the first filter press 2, the second reactor 3, the second filter press 4, the third reactor 5, the third filter press 6, the drying machine 7, and the crusher 8.

[0025] It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A waste acid treatment device in the production of 2-ethylanthraquinone, characterized in that: It includes a first reactor, a first filter, a second reactor, a second filter, a third reactor, a third filter, an evaporation dryer and a pulverizer which are connected in sequence; the first reactor, the second reactor and the third reactor are all provided with stirring devices, solid material feed inlets and liquid material feed inlets; the filtrate outlet of the first filter is connected to the liquid material feed inlet of the first reactor through pipelines, valves, pumps and a first filtrate storage tank, the filtrate outlet of the second filter is connected to the feed inlet of the first filter through pipelines, valves, pumps and a second filtrate storage tank, and the filtrate outlet of the third filter is connected to the liquid material feed inlet of the third reactor through pipelines, valves, pumps and a third filtrate storage tank.

2. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, wherein: The first filter, the second filter and the third filter are all plate and frame filter presses.

3. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, characterized in that: The first filter is also connected to a dilute sulfuric acid storage tank through pipelines, valves and pumps.

4. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, wherein: The second filter is also connected to a washing water storage tank through pipelines, valves and pumps, and the washing water of the second filter is connected to an acid precipitation device in the production process through pipelines, valves and pumps.

5. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, characterized in that: The evaporation dryer is a rotary flash dryer.

6. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, characterized in that: The pulverizer is connected to a packaging device through a conveying pipeline.

7. The waste acid treatment device in the production of 2-ethylanthraquinone according to claim 1, characterized in that: The pulverizer is a fluidized bed jet mill.

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