Device for recovering hydrazine hydrate from isoxadifen-ethyl acid production wastewater

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a device for recovering hydrazine hydrate from isoxadifen-ethyl acid production wastewater, which comprises a wastewater acid adjusting kettle, and a feed port of the wastewater acid adjusting kettle is communicated to a hydrochloric acid storage tank through a hydrochloric acid transfer pump and is also communicated to a wastewater storage tank through a wastewater transfer pump; a discharge port of the wastewater acid adjusting kettle is communicated to a first centrifugal machine, a solid material outlet of the first centrifugal machine is communicated to a feeder, a discharge port of the feeder is communicated to a feed port of a hydrazine recovery kettle, and the feed port of the hydrazine recovery kettle is further communicated to a liquid caustic soda storage tank through a liquid caustic soda transfer pump; a discharge hole of the hydrazine recovery kettle is communicated to a second centrifugal machine, a solid material outlet of the second centrifugal machine is communicated to a bagging machine, and a liquid material outlet of the second centrifugal machine is communicated to a hydrazine hydrate storage tank through a hydrazine transfer pump. The hydrazine hydrate recovery device can effectively recover hydrazine hydrate in the isoxadifen-ethyl acid production wastewater, so that the environmental safety is ensured, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a device for recovering hydrazine hydrate from the production wastewater of bisbenzoxazole acid. Background Technique

[0002] The chemical name of bisbenzoxazole acid is ethyl 4,5-dihydro-5,5-diphenyl-isoxazole-3-carboxylate, which is an adjuvant for reducing or eliminating the phytotoxicity of herbicides to crops, also known as a herbicide safener, used for compounding with herbicides to control annual and perennial weeds in corn fields, and has a wide market.

[0003] Most of the existing preparation methods adopt the method of synthesizing bisbenzoxazole acid by taking benzophenone as the starting material and going through processes such as reduction and oxidation. Hydrazine hydrate appears in large quantities as a reducing agent in the production wastewater. If the above wastewater is not treated, it will seriously endanger environmental safety; hydrazine hydrate, as a strong reducing agent, can be used as a raw material for medicines, pesticides, dyes, foaming agents, imaging agents, antioxidants, can be used as a deoxidizer for large boiler water, and is used to manufacture rocket fuels and explosives, etc. Directly transporting the wastewater to the sewage treatment plant for treatment not only increases the difficulty of sewage treatment, but also causes waste of raw materials. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a device for recovering hydrazine hydrate from the production wastewater of bisbenzoxazole acid, which can effectively recover hydrazine hydrate from the production wastewater of bisbenzoxazole acid, ensure environmental safety, and improve economic benefits.

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

[0006] A device for recovering hydrazine hydrate from the production wastewater of bisbenzoxazole acid includes a wastewater acidification kettle. The feed inlet of the wastewater acidification kettle is connected to a hydrochloric acid storage tank through a hydrochloric acid transfer pump, and is also connected to a wastewater storage tank through a wastewater transfer pump; the discharge outlet of the wastewater acidification kettle is connected to a first centrifuge, the solid material outlet of the first centrifuge is connected to a feeder, the discharge outlet of the feeder is connected to the feed inlet of a hydrazine recovery kettle, and the feed inlet of the hydrazine recovery kettle is also connected to a liquid alkali storage tank through a liquid alkali transfer pump; the discharge outlet of the hydrazine recovery kettle is connected to a second centrifuge, the solid material outlet of the second centrifuge is connected to a bagging machine, and the liquid material outlet of the second centrifuge is connected to a hydrazine hydrate storage tank through a hydrazine transfer pump.

[0007] Preferably, both the first centrifuge and the second centrifuge are belt centrifuges, with the model being PLD1600NF and the manufacturer being Jiangsu Saidel Pharmaceutical Machinery Manufacturing Co., Ltd.

[0008] Preferably, the liquid material outlet of the first centrifuge is connected to the methanol distillation column through an acid water transfer pump. The methanol outlet of the methanol distillation column is connected to the methanol storage tank through a condensation device, and the water outlet of the methanol distillation column is connected to the recycled water storage tank. Recycling the collected water saves resources.

[0009] Further, the condensation device is a water-cooled condenser. The model is Q235B vertical, and the manufacturer is Shandong Hante Industrial Equipment Manufacturing Co., Ltd.

[0010] Preferably, the feeder is a screw feeder. The model is LSY273, and the manufacturer is Zhengzhou Shengzhaoda Machinery Manufacturing Co., Ltd.

[0011] Preferably, the bagging machine is an automatic bagging machine. It is a fully automatic quantitative packaging system provided by the METTLER TOLEDO Group.

[0012] Due to the adoption of the above technical solutions, the beneficial effects of the present utility model are:

[0013] In the present utility model, hydrazine hydrate is neutralized by reacting hydrochloric acid with wastewater. The reacted material is separated by the first centrifuge. The liquid material is transported to the methanol distillation column through an acid water transfer pump to separate water and methanol; the solid material is transported to the hydrazine recovery kettle, and liquid alkali is added for reaction. The reacted material is separated by the second centrifuge. The obtained solid is waste salt, which is packaged by a packaging machine and then subjected to hazardous waste treatment. The obtained liquid is hydrazine hydrate, which is temporarily stored in the hydrazine hydrate storage tank.

[0014] In summary, the present utility model can effectively recover hydrazine hydrate from the wastewater generated in the production of bisbenzoxazole acid, ensuring environmental safety and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

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

[0017] Embodiment 1:

[0018] As Figure 1As shown in the figure, a device for recovering hydrazine hydrate from the wastewater produced in the production of bisoxazole acid includes a wastewater acidification kettle. The feed inlet of the wastewater acidification kettle is connected to a hydrochloric acid storage tank through a hydrochloric acid transfer pump, and is also connected to a wastewater storage tank through a wastewater transfer pump. The discharge outlet of the wastewater acidification kettle is connected to a first centrifuge. The solid material outlet of the first centrifuge is connected to a feeder. The discharge outlet of the feeder is connected to the feed inlet of a hydrazine recovery kettle. The feed inlet of the hydrazine recovery kettle is also connected to a liquid caustic soda storage tank through a liquid caustic soda transfer pump. The discharge outlet of the hydrazine recovery kettle is connected to a second centrifuge. The solid material outlet of the second centrifuge is connected to a bagging machine. The liquid material outlet of the second centrifuge is connected to a hydrazine hydrate storage tank through a hydrazine transfer pump.

[0019] The liquid material outlet of the first centrifuge is connected to a methanol distillation column through an acid water transfer pump. The methanol outlet of the methanol distillation column is connected to a methanol storage tank through a condensation device. The water outlet of the methanol distillation column is connected to a recycled water storage tank.

[0020] During actual production: The wastewater produced in the production of bisoxazole acid in the wastewater storage tank is transported to the wastewater acidification kettle through a wastewater transfer pump. At the same time, the hydrochloric acid in the hydrochloric acid storage tank is also transported to the wastewater acidification kettle through a hydrochloric acid transfer pump for a neutralization reaction. The reacted material is transported to the first centrifuge for centrifugation. The liquid produced after centrifugation is transported to the methanol distillation column through an acid water transfer pump to separate water and methanol. Both the water and methanol can be recycled or sold, improving the economic benefits of the product. The solid produced by the first centrifuge is transported to the hydrazine recovery kettle, and liquid caustic soda is added for reaction. The reacted material is separated by the second centrifuge. The obtained solid is waste salt, which is packaged by a packaging machine and then treated as hazardous waste. The obtained liquid is hydrazine hydrate, which is temporarily stored in the hydrazine hydrate storage tank. In this way, the hydrazine hydrate in the wastewater produced in the production of bisoxazole acid can be recovered, and at the same time, methanol and water are also recovered, achieving the effects of protecting environmental safety and improving economic benefits.

[0021] 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 device for recovering hydrazine hydrate from isoxadiazole production wastewater, characterized in that: The invention comprises a wastewater acid adjustment kettle, wherein the feed port of the wastewater acid adjustment kettle is connected to a hydrochloric acid storage tank through a hydrochloric acid transfer pump, and is also connected to the wastewater storage tank through a wastewater transfer pump; the discharge port of the wastewater acid adjustment kettle is connected to a first centrifuge, the solid material outlet of the first centrifuge is connected to a feeder, the discharge port of the feeder is connected to the feed port of a hydrazine recovery kettle, and the feed port of the hydrazine recovery kettle is also connected to the liquid alkali storage tank through a liquid alkali transfer pump; the discharge port of the hydrazine recovery kettle is connected to a second centrifuge, the solid material outlet of the second centrifuge is connected to a bagging machine, and the liquid material outlet of the second centrifuge is connected to a hydrazine hydrate storage tank through a hydrazine transfer pump.

2. The device for recovering hydrazine hydrate from isoxadiazole production wastewater as claimed in claim 1, characterized in that: The first centrifuge and the second centrifuge are both belt centrifuges.

3. The device for recovering hydrazine hydrate from isoxadiazole production wastewater as claimed in claim 1, characterized in that: The liquid outlet of the first centrifuge is connected to the methanol distillation tower through an acid water transfer pump, the methanol outlet of the methanol distillation tower is connected to the methanol storage tank through a condensing device, and the water outlet of the methanol distillation tower is connected to the processing water storage tank.

4. The device for recovering hydrazine hydrate from isoxadiazole production wastewater as claimed in claim 3, characterized in that: The condensing device is a water-cooled condenser.

5. The device for recovering hydrazine hydrate from isoxadiazole production wastewater as claimed in claim 1, characterized in that: The feeder is a spiral feeder.

6. The device for recovering hydrazine hydrate from isoxadiazole production wastewater according to claim 1, characterized in that: The bagging machine is an automatic bagging machine.

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