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Method of treating wastewater containing salt for producing hydrazine hydrate by carbamide method

A technology for salty wastewater and treatment methods, applied in the direction of oxidized water/sewage treatment, etc., can solve problems such as environmental pollution, resource waste, unusable salt water, etc., and achieve the effect of making full use of resources and avoiding waste

Active Publication Date: 2005-10-26
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen that such a production method has the following disadvantages: in the saturated brine produced in the saline-alkali recovery and classification process, due to containing hydrazine hydrate, ammonia and caustic soda, it is directly discharged on the one hand, which not only causes waste of resources, but also greatly exceeds the standard due to the ammonia nitrogen index of the waste water. (Wastewater discharge standard discharge ammonia nitrogen index is 15mg / l), the pollution to the environment is more serious; on the other hand, if this saturated brine is sent to the chlor-alkali system for use, ammonia and hydrazine hydrate will be converted into nitrogen trichloride in the chlorine system to chlor-alkali The production has buried a major source of hidden dangers; on the other hand, the excessively high caustic soda content of the saturated brine is sent to the chlor-alkali system, which will make the brine of the chlor-alkali system unusable
Unfortunately, so far, no literature has been found on how to treat the saturated brine produced in the saline-alkali recovery and classification process and use the treated useful substances in the chlor-alkali production process

Method used

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  • Method of treating wastewater containing salt for producing hydrazine hydrate by carbamide method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Using hydrogen peroxide as an oxidant to treat saline wastewater from the urea process.

[0035] Add the solid sodium chloride separated from saline-alkali recovery into the salt tank, control a certain height of the salt layer, and add the 280-300g / l brine prepared by adding industrial water into the brine storage tank. According to the NH contained in the brine, 3 with N 2 h 4 ·H 2 For the amount of O, add hydrogen peroxide of matching equivalent to it and use the pump to circulate the reaction. After the content of ammonia nitrogen is less than 15mg / l, according to the amount of NaOH contained in the brine, add hydrochloric acid of matching equivalent to it for circulation reaction. When the content of NaOH is less than 0.1 g / l, it is pumped to the caustic soda production system as raw brine. Among them, the following reaction takes place in the solution:

[0036]

[0037]

[0038]

Embodiment 2

[0039] Example 2: Using chlorine gas as an oxidant to treat saline wastewater from the urea process.

[0040] Add the solid sodium chloride separated from saline-alkali recovery into the salt tank, control a certain height of the salt layer, and add the 280-300g / l brine prepared by adding industrial water into the brine storage tank. According to the NH contained in the brine, 3 with N 2 h 4 ·H 2 For the amount of O, feed chlorine gas of matching equivalent into it and use the pump to circulate the reaction. After the content of ammonia nitrogen is less than 15mg / l, according to the amount of NaOH contained in the brine, add hydrochloric acid of matching equivalent to the inside for circulation reaction. When the content of NaOH is less than After 0.1g / l, it is pumped to the caustic soda production system as raw brine. Among them, the following reaction takes place in the solution:

[0041]

[0042]

[0043]

Embodiment 3

[0044] Example 3: Using sodium hypochlorite as an oxidant to treat saline wastewater from the urea process.

[0045] Add the solid sodium chloride separated from saline-alkali recovery into the salt tank, control a certain height of the salt layer, and add the 280-300g / l brine prepared by adding industrial water into the brine storage tank. According to the NH contained in the brine,3 with N 2 h 4 ·H 2 The amount of O, add matching equivalent sodium hypochlorite to it and use the pump to circulate the reaction. After the ammonia nitrogen content is less than 15mg / l, according to the amount of NaOH contained in the brine, add the matching equivalent hydrochloric acid to the inside for circulation reaction. When the NaOH content is less than 0.1 g / l, it is pumped to the caustic soda production system as raw brine. Among them, the following reaction takes place in the solution:

[0046]

[0047]

[0048] .

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Abstract

The present invention is mainly characterized by that in the saturated brine adding equivalent oxidative substance matched with hydrazine hydrate and ammonia existed in waste water to make the hydrazine hydrate and ammonia be reacted with oxidative substance and converter into nitrogen gas and water, then adding equivalent hydrochloric acid matched with sodium hydroxide existed in the brine to make the hydrochloric acid be reacted with sodium hydroxide, and converted into sodium chloride, then recovering sodium chloride, and the nitrogen gas can be directly discharged into atmosphere.

Description

technical field [0001] The invention relates to a method for treating by-products in the process of producing hydrazine hydrate by oxidizing urea, sodium hypochlorite and sodium hydroxide, more specifically, a method for treating saturated brine produced in the process of saline-alkali recovery and classification. Background technique [0002] Hydrazine hydrate, also known as: hydrazine hydrate, chemical formula: N 2 h 4 ·H 2 O, molecular weight: 50.07, is a fine chemical product. As a chemical intermediate, hydrazine hydrate has a wide range of potential uses and application fields, which are mainly divided into three aspects: first, the production of plastic foaming agents; second, in the steam cycle of the power industry, it is used to prevent The pipes are rusted and aged in advance, thereby greatly improving the safety and reliability of the power station; in addition, hydrazine hydrate is also an important raw material for medicine and pesticid...

Claims

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Application Information

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IPC IPC(8): C02F1/72
Inventor 罗云郑春宁刘灵伟李强胡顺辉孙永贵傅永宽袁雄赖中胜
Owner YIBIN TIANYUAN GRP CO LTD
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