Post-treatment device for 2-ethyl anthraquinone production

Abstract

The utility model discloses a post-treatment device for 2-ethyl anthraquinone production, and relates to the technical field of 2-ethyl anthraquinone production, an outlet of an acid precipitation liquid tank is communicated with an intermediate tank through a pipeline, an inlet of the intermediate tank is communicated with a toluene tank through a pipeline, an outlet of the intermediate tank is communicated with a first standing layering tank through a pipeline, and an outlet of the first standing layering tank is communicated with a second standing layering tank through a pipeline. An outlet of the first standing layering tank is communicated with an organic phase tank through a pipeline, and an outlet of the organic phase tank is communicated to an alkali washing tank through a first transfer pump; an outlet of the alkali washing tank is communicated with a second standing layering tank through a pipeline, an inlet of the second standing layering tank is communicated with a process water tank through a pipeline, a lower outlet of the second standing layering tank is communicated with a centrifugal machine through a pipeline, and a solid phase outlet of the centrifugal machine is communicated with a 2-ethyl anthraquinone tank through a pipeline. According to the present invention, the toluene is subjected to distillation recovery without heating in the whole process, such that the energy source is saved, the safety to the environment and the human body is high, and the purity of the obtained 2-ethyl anthraquinone product is high through the two-step layering and the centrifugal filtration.

Description

Technical Field

[0001] The utility model relates to the technical field of 2-ethylanthraquinone production, in particular to a post-processing device for 2-ethylanthraquinone production. Background Art

[0002] 2-Ethylanthraquinone is a very important fine chemical product and an important working fluid in the production of hydrogen peroxide. It is also widely used in the dye industry, photocurable resins and photosensitive polymerization.

[0003] The most commonly used production process at home and abroad is to use phthalic anhydride, ethylbenzene and aluminum chloride as raw materials to prepare 2-ethylanthraquinone. Phthalic anhydride and ethylbenzene undergo Friedel-Crafts acylation reaction under the action of aluminum chloride to generate 2-ethylbenzoyl benzoic acid aluminum double salt, which 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-closing reaction under the action of 20% fuming sulfuric acid to generate 2-ethylanthraquinone.

[0004] In industrial production, 2-ethylanthraquinone is easily soluble in concentrated sulfuric acid (fuming sulfuric acid) but insoluble in dilute sulfuric acid. A large amount of industrial water is added to dilute the aforementioned BE acid closed-loop liquid, so that 2-ethylanthraquinone is precipitated from the sulfuric acid solution, which is called the acid precipitation process. Toluene is then used to dissolve the 2-ethylanthraquinone in the acid precipitation liquid, and the toluene is recovered after distillation to obtain the finished product 2-ethylanthraquinone. A large amount of heat energy is wasted in the toluene distillation process, and the toluene gas generated in the distillation process may escape, causing harm to the environment and operators. In addition, incomplete distillation will result in low purity of the product. Summary of the invention

[0005] The technical problem to be solved by the utility model is: in view of the deficiencies in the prior art, a post-processing device for producing 2-ethylanthraquinone is provided, which saves energy, is environmentally friendly, and the obtained 2-ethylanthraquinone product has high purity.

[0006] In order to solve the above technical problems, the technical solution of the utility model is:

[0007] A post-processing device for the production of 2-ethylanthraquinone, comprising an acid separation tank, the outlet of the acid separation tank is connected to an intermediate tank through a pipeline, the inlet of the intermediate tank is connected to a toluene tank through a pipeline, the outlet of the intermediate tank is connected to a first static stratification tank through a pipeline, the outlet of the first static stratification tank is connected to a waste acid tank and an organic phase tank through a pipeline, and the outlet of the organic phase tank is connected to an alkali washing tank through a first material transfer pump;

[0008] The outlet of the alkali washing tank is connected to the second standing stratification tank through a pipeline, the inlet of the alkali washing tank is connected to the sodium hydroxide tank through a pipeline, the inlet of the second standing stratification tank is connected to the process water tank through a pipeline, the lower outlet of the second standing stratification tank is connected to the centrifuge through a pipeline, and the solid phase outlet of the centrifuge is connected to the 2-ethylanthraquinone tank through a pipeline.

[0009] As an improved technical solution, the upper outlet of the second static stratification tank is connected to the third static stratification tank through a second material transfer pump, and the outlet of the third static stratification tank is connected to a toluene recovery tank through a pipeline.

[0010] As an improved technical solution, the outlet of the toluene recovery tank is connected to the toluene tank via a third transfer pump.

[0011] As an improved technical solution, the outlet of the third material transfer pump is connected to the inlet of the third static stratification tank through a pipeline.

[0012] As an improved technical solution, the outlet of the alkali washing tank is connected to the inlet of the first material transfer pump through a pipeline.

[0013] As an improved technical solution, the solid phase outlet of the centrifuge is connected to a dryer through a pipeline, and the outlet of the dryer is connected to the 2-ethylanthraquinone tank through a pipeline.

[0014] As a preferred technical solution, the outlet of the first material transfer pump is connected to the organic phase tank through a pipeline.

[0015] As a preferred technical solution, a density sensor is provided on the outlet pipe of the first static stratification tank, a cut-off valve is provided on the inlet pipe of the organic phase tank, and the density sensor and the cut-off valve are interlocked to a control system.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] The utility model discloses a post-processing device for producing 2-ethylanthraquinone, comprising an acid precipitation liquid tank, wherein the outlet of the acid precipitation liquid tank is connected with an intermediate tank through a pipeline, the inlet of the intermediate tank is connected with a toluene tank through a pipeline, the outlet of the intermediate tank is connected with a first static stratification tank through a pipeline, the outlet of the first static stratification tank is connected with a waste acid tank and an organic phase tank through a pipeline, the outlet of the organic phase tank is connected to an alkali washing tank through a first material transfer pump; the outlet of the alkali washing tank is connected with a second static stratification tank through a pipeline, the inlet of the alkali washing tank is connected with a sodium hydroxide tank through a pipeline, the inlet of the second static stratification tank is connected with a process water tank through a pipeline, the lower outlet of the second static stratification tank is connected with a centrifuge through a pipeline, and the solid phase outlet of the centrifuge is connected with the 2-ethylanthraquinone tank through a pipeline. The acid precipitated liquid enters the intermediate tank and contacts with toluene, wherein 2-ethylanthraquinone is dissolved in toluene, and is separated by the first static stratification tank to obtain waste sulfuric acid liquid and organic phase, wherein the organic phase enters the alkali washing tank to remove the organic sulfonate therein, and then the remaining organic phase enters the second static stratification tank, and is stratified after adding process water, wherein the upper layer is toluene, the middle is water, and the lower layer is 2-ethylanthraquinone, and the 2-ethylanthraquinone in the lower layer is separated and purified by a centrifuge to obtain a 2-ethylanthraquinone product. The entire process does not require heating to distill and recover toluene, which saves energy and is safer for the environment and human body. In addition, the 2-ethylanthraquinone product obtained by two-step stratification and centrifugal filtration has high purity.

[0018] The upper outlet of the second static stratification tank of the utility model is connected to the third static stratification tank through the second material transfer pump, and the outlet of the third static stratification tank is connected to the toluene recovery tank through a pipeline. By recovering the toluene on the upper part of the second static stratification tank, the waste of raw materials is avoided. At the same time, toluene and water are immiscible, the separation is simple, and the production cost is saved.

[0019] The outlet of the toluene recovery tank is connected to the toluene tank through a third transfer pump, and the toluene in the toluene recovery tank is pumped into the toluene tank for reuse through the third transfer pump, thereby avoiding waste and saving costs.

[0020] The outlet of the third transfer pump is connected to the inlet of the third static stratification tank through a pipeline. The liquid in the toluene recovery tank can enter the third static stratification tank for further separation, thereby improving the purity of the obtained toluene, so that it can be directly used for the extraction of the acid separation liquid.

[0021] The outlet of the alkali washing tank is connected to the inlet of the first material transfer pump through a pipeline. The first material transfer pump can realize external circulation of the liquid in the alkali washing tank, the liquid mixing effect is better, the alkali washing of the material is more thorough, and the purity of the 2-ethylanthraquinone product is greatly improved.

[0022] The solid phase outlet of the centrifuge is connected to a dryer through a pipeline, and the outlet of the dryer is connected to the 2-ethylanthraquinone tank through a pipeline. The product is further dehydrated by the dryer to ensure that the obtained 2-ethylanthraquinone has higher purity and lower water content.

[0023] The outlet of the first material transfer pump is connected to the organic phase tank through a pipeline, and the organic phase entering the alkali washing tank can be allowed to stand and stratify again, thereby preventing waste acid from entering the alkali washing tank and causing subsequent processing difficulties.

[0024] The outlet pipe of the first static stratification tank is provided with a density sensor, the inlet pipe of the organic phase tank is provided with a cut-off valve, and the density sensor and the cut-off valve are interlocked to a control system. The control system adjusts the opening and closing of the cut-off valve according to the density sensor, which greatly reduces the possibility of waste acid entering the organic phase tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0027] Among them: 1. Acid separation tank; 2. Intermediate tank; 3. Toluene tank; 4. First standing and stratification tank; 5. Waste acid tank; 6. Organic phase tank; 7. First transfer pump; 8. Alkaline washing tank; 9. Second standing and stratification tank; 10. Sodium hydroxide tank; 11. Process water tank; 12. Centrifuge; 13. 2-ethylanthraquinone tank; 14. Second transfer pump; 15. Third standing and stratification tank; 16. Toluene recovery tank; 17. Third transfer pump; 18. Dryer; 19. Density sensor; 20. Shut-off valve. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1As shown, a post-processing device for the production of 2-ethylanthraquinone includes an acid precipitation liquid tank 1, the outlet of the acid precipitation liquid tank 1 is connected to an intermediate tank 2 through a pipeline, the inlet of the intermediate tank 2 is connected to a toluene tank 3 through a pipeline, the outlet of the intermediate tank 2 is connected to a first static stratification tank 4 through a pipeline, the outlet of the first static stratification tank 4 is connected to a waste acid tank 5 and an organic phase tank 6 through a pipeline, the outlet of the organic phase tank 6 is connected to an alkali washing tank 8 through a first material transfer pump 7; the outlet of the alkali washing tank 8 is connected to a second static stratification tank 9 through a pipeline, the inlet of the alkali washing tank 8 is connected to a sodium hydroxide tank 10 through a pipeline, the inlet of the second static stratification tank 9 is connected to a process water tank 11 through a pipeline, the lower outlet of the second static stratification tank 9 is connected to a centrifuge 12 through a pipeline, and the solid phase outlet of the centrifuge 12 is connected to a 2-ethylanthraquinone tank 13 through a pipeline. The acid precipitated liquid enters the intermediate tank 2 and contacts with toluene, wherein 2-ethylanthraquinone is dissolved in toluene, and is separated by the first static stratification tank 4 to obtain waste sulfuric acid liquid and an organic phase, wherein the organic phase enters the alkali washing tank 8 to remove the organic sulfonate therein, and then the remaining organic phase enters the second static stratification tank 9, and is stratified after adding process water, wherein the upper layer is toluene, the middle is water, and the lower layer is 2-ethylanthraquinone, and the 2-ethylanthraquinone in the lower layer is separated and purified by a centrifuge 12 to obtain a 2-ethylanthraquinone product. The entire process does not require heating to distill and recover toluene, which saves energy and is safer for the environment and human body. In addition, the 2-ethylanthraquinone product obtained by two-step stratification and centrifugal filtration has high purity.

[0030] The upper outlet of the second static stratification tank 9 is connected to the third static stratification tank 15 through the second transfer pump 14, and the outlet of the third static stratification tank 15 is connected to the toluene recovery tank 16 through a pipeline. By recovering the toluene on the upper part of the second static stratification tank 9, the waste of raw materials is avoided. At the same time, toluene and water are immiscible, the separation is simple, and the production cost is saved.

[0031] The outlet of the toluene recovery tank 16 is connected to the toluene tank 3 through the third transfer pump 17. The toluene in the toluene recovery tank 16 is pumped into the toluene tank 3 for reuse through the third transfer pump 17, thereby avoiding waste and saving costs.

[0032] The outlet of the third transfer pump 17 is connected to the inlet of the third static stratification tank 15 through a pipeline. The liquid in the toluene recovery tank 16 can enter the third static stratification tank 15 for further separation, thereby improving the purity of the obtained toluene, so that it can be directly used for the extraction of the acid separation liquid.

[0033] The outlet of the alkali washing tank 8 is connected to the inlet of the first material transfer pump 7 through a pipeline. The first material transfer pump 7 can realize external circulation of the liquid in the alkali washing tank 8, the liquid mixing effect is better, the alkali washing of the material is more thorough, and the purity of the 2-ethylanthraquinone product is greatly improved.

[0034] The solid phase outlet of the centrifuge 12 is connected to a dryer 18 through a pipeline, and the outlet of the dryer 18 is connected to the 2-ethylanthraquinone tank 13 through a pipeline. The product is further dehydrated by the dryer 18 to ensure that the obtained 2-ethylanthraquinone has higher purity and lower water content.

[0035] The outlet of the first material transfer pump 7 is connected to the organic phase tank 6 through a pipeline, and the organic phase entering the alkali washing tank 8 can be allowed to stand and stratify again to prevent waste acid from entering the alkali washing tank 8 and causing subsequent processing difficulties.

[0036] A density sensor 19 is provided on the outlet pipe of the first static stratification tank 4, and a cut-off valve 20 is provided on the inlet pipe of the organic phase tank 6. The density sensor 19 and the cut-off valve 20 are interlocked to a control system. The control system adjusts the opening and closing of the cut-off valve 20 according to the density sensor 19, which greatly reduces the possibility of waste acid entering the organic phase tank 6.

[0037] It should be understood that these embodiments are only used to illustrate the present invention and are not used 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 claims attached to this application.

Claims

1. A post-processing device for the production of 2-ethylanthraquinone, comprising an acid separation tank, characterized in that: The outlet of the acid separation tank is connected to an intermediate tank through a pipeline, the inlet of the intermediate tank is connected to a toluene tank through a pipeline, the outlet of the intermediate tank is connected to a first static stratification tank through a pipeline, the outlet of the first static stratification tank is connected to a waste acid tank and an organic phase tank through a pipeline, and the outlet of the organic phase tank is connected to an alkali washing tank through a first material transfer pump; The outlet of the alkali washing tank is connected to the second standing stratification tank through a pipeline, the inlet of the alkali washing tank is connected to the sodium hydroxide tank through a pipeline, the inlet of the second standing stratification tank is connected to the process water tank through a pipeline, the lower outlet of the second standing stratification tank is connected to the centrifuge through a pipeline, and the solid phase outlet of the centrifuge is connected to the 2-ethylanthraquinone tank through a pipeline.

2. A post-processing device for 2-ethylanthraquinone production as claimed in claim 1, characterized in that: The upper outlet of the second static stratification tank is connected to the third static stratification tank through a second material transfer pump, and the outlet of the third static stratification tank is connected to a toluene recovery tank through a pipeline.

3. A post-processing device for 2-ethylanthraquinone production as claimed in claim 2, characterized in that: The outlet of the toluene recovery tank is connected to the toluene tank through a third transfer pump.

4. A post-processing device for the production of 2-ethylanthraquinone as claimed in claim 3, characterized in that: The outlet of the third material transfer pump is connected to the inlet of the third static stratification tank through a pipeline.

5. A post-processing device for producing 2-ethylanthraquinone as claimed in claim 1, characterized in that: The outlet of the alkali washing tank is connected to the inlet of the first material transfer pump through a pipeline.

6. A post-processing device for producing 2-ethylanthraquinone as claimed in claim 1, characterized in that: The solid phase outlet of the centrifuge is connected to a dryer through a pipeline, and the outlet of the dryer is connected to the 2-ethylanthraquinone tank through a pipeline.

7. A post-processing device for producing 2-ethylanthraquinone as claimed in claim 1, characterized in that: The outlet of the first material transfer pump is connected to the organic phase tank through a pipeline.

8. A post-processing device for producing 2-ethylanthraquinone as claimed in claim 1, characterized in that: A density sensor is provided on the outlet pipe of the first static stratification tank, a cut-off valve is provided on the inlet pipe of the organic phase tank, and the density sensor and the cut-off valve are interlocked to a control system.

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