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Method and device for wastewater treatment and salt extraction during hydrazine hydrate production by ketazine process

A technology of ketazine method and wastewater treatment, which is applied in the directions of water/sewage multi-stage treatment, heating water/sewage treatment, water/sludge/sewage treatment, etc. To deal with problems such as difficult to control and so on, to achieve the effect of saving production cost, reducing pollution and making full use of resources

Active Publication Date: 2013-04-03
广州新普利节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, because the wastewater contains a large amount of salt, it is difficult to treat it with biochemical methods
In addition, some enterprises use chemical and physical methods to purify the salty wastewater and then refine the brine to recover the salt in the wastewater for caustic soda production. Safety production is extremely harmful and extremely difficult to control

Method used

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  • Method and device for wastewater treatment and salt extraction during hydrazine hydrate production by ketazine process
  • Method and device for wastewater treatment and salt extraction during hydrazine hydrate production by ketazine process

Examples

Experimental program
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Embodiment 1

[0037] Please refer to figure 1 , the ketazine method of the present invention produces the wastewater treatment of hydrazine hydrate and the method for extracting salt, it is characterized in that comprising the following steps in sequence:

[0038] 1) Recycling and storage of saline wastewater;

[0039] 2) Preheat the waste water to 80-100°C;

[0040] 3) Waste water is evaporated and crystallized in the mechanical vapor recompression cycle evaporation system. The temperature of evaporation and crystallization is 50-120°C to obtain salt slurry and crystallization mother liquor. The water vapor generated by evaporation is condensed into condensed water and then enters the cold water storage tank. The condensed water After heat exchange and cooling, it enters the biochemical treatment station, and is reused or discharged after being treated by biochemical methods. After the crystallization mother liquor reacts with the oxidant, it is recovered and stored as saline wastewater; ...

Embodiment 2

[0047] The difference between this embodiment and embodiment 1 lies in: Step 3) The waste water is evaporated and crystallized by using a multi-effect concentration and evaporation system, and the temperature of the evaporation and crystallization is 50-120°C. After the waste water is preheated, it is evaporated in effect I, and then advectively enters effect II, effect III, effect IV, effect V, and effect VI to evaporate, choose to crystallize and discharge salt in effect V and effect VI, and extract crystallization mother liquor in effect VI for recycling treatment. The raw steam first enters the I effect as the heat source, the secondary steam of the I effect acts as the heat source of the II effect, and in turn, the secondary steam of the former effect acts as the heat source of the after effect. The source of the condensed water of effect I is raw steam, so it can be reused directly after heat exchange. The condensed water of other effects contains various organic impuriti...

Embodiment 3

[0049] The difference between this example and Example 2 is that the pH value of the saline wastewater is adjusted to 7 before preheating.

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Abstract

The invention discloses a method for wastewater treatment and salt extraction during hydrazine hydrate production by ketazine process, which sequentially comprises the following steps: 1) recovering and storing the salt-contained wastewater; 2) preheating the wastewater and raising temperature; 3) performing evaporative crystallization to the wastewater, condensing the steam to form condensate water, introducing the condensate water into a cold water storage tank, performing heat exchange to and cooling the condensate water, and then introducing the condensate water into a biochemical treatment station, taking reaction by the crystallization mother liquor and an oxidant, taking the reacted solution as the salt-contained wastewater to be recovered and stored; 4) performing centrifugal separation to the salt liquid, and returning the centrifuged mother liquor to evaporative crystallization for recycle; 5) sending wet salt to be washed by saturated salt water to obtain pure salt liquid; and 6) performing centrifugal separation to the pure salt liquid, and resending the centrifuged mother liquor to be washed by the saturated salt water for recycle. The invention further discloses a device for implementing the method. The method and the device can recover the inorganic salt in the wastewater, and the separated wastewater is organic wastewater, and can be recycled or discharged after qualification through biochemical treatment, so that the resource is fully utilized, the environment pollution is reduced, and the production cost of the enterprise is reduced.

Description

[0001] technical field [0002] The invention relates to a wastewater treatment method, in particular to a method and device for wastewater treatment and salt extraction of hydrazine hydrate produced by a ketazine method. [0003] Background technique [0004] Hydrazine hydrate, also known as hydrazine hydrate, is an important chemical raw material and a strong reducing agent. It is a raw material for foaming agents, medicines, pesticides, dyes, antioxidants, etc. It is also used in the manufacture of rocket fuel and explosives. With the advancement of technology and the development of society, the application fields of hydrazine hydrate are constantly expanding in recent years. [0005] The production methods of hydrazine hydrate mainly include Raschig method, urea method, ketazine method, hydrogen peroxide method and air oxidation method. Due to serious environmental pollution, large equipment investment, and low product yield, the Rasig method has been basically elimina...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F9/10C01D3/06C02F1/04
Inventor 莫新来莫明光陈胜利何睦盈谭子斌覃涛
Owner 广州新普利节能环保科技有限公司
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