Treatment method of hydrazine hydrate byproduct sodium chloride brine

Abstract

The invention discloses a treatment method of hydrazine hydrate byproduct sodium chloride saline water, which comprises the following steps: a, adding an acid into hydrazine hydrate byproduct sodium chloride saline water, regulating the pH value of the saline water to be less than or equal to 4, and adding a homogeneous catalyst into the saline water; b, fully enabling the heated saline water to make contact and react with oxygen; c, adding a homogeneous catalyst into the saline water after the primary reaction, adding an acid to adjust the pH value to be less than or equal to 2, and then conducting full contact with oxygen for reaction; s5, cooling the saline water after the secondary reaction, and removing gaseous ammonia in the saline water after the secondary reaction through an ammonia nitrogen separation membrane; and s6, carrying out evaporative crystallization on the saline water, and then carrying out solid-liquid separation to obtain a solid salt product. The method has the advantages that the TOC of the solid salt product can be controlled to be 10ppm or less, the ammonia nitrogen can be controlled to be 4ppm or less, and the treatment cost is low. The prepared solid salt can be directly used as a chlor-alkali production raw material to enter an ionic membrane electrolytic cell system for use, or is matched with newly purchased raw salt in proportion to enter the ionic membrane electrolytic cell system for use, and the stable operation of the ionic membrane electrolytic cell is not influenced.

Description

technical field [0001] The invention relates to a production technology of hydrazine hydrate, in particular to a method for treating by-products in the production of hydrazine hydrate by ketazine method. Background technique [0002] Hydrazine hydrate, also known as hydrazine hydrate, is an important fine chemical raw material. Hydrazine hydrate can be used to synthesize various foaming agents and cleaning agents, and can also be used in medicines, herbicides, rubber additives, rocket fuels and other fields. The synthetic methods of hydrazine hydrate mainly include Raschig method, urea method, ketazine method and hydrogen peroxide method. Among them, the ketazine method has the advantages of less investment, high product yield, low energy consumption, and low cost. It is more common to use this method to prepare hydrazine hydrate at home and abroad. However, the ketazine method will produce waste water with a high salt content and a high concentration of sodium chloride, w...

AI Technical Summary

Problems solved by technology

However, the content of organic matter in the solid salt treated by the above method is still too high, so it can only be treated as general solid waste landfill or used in some restricted areas. This way of polluting landfill or transfer is not in line with the sustainable development of the hydrazine hydrate industry. The goal

In addition, the problem of using technologies such as microfiltration, nanofiltration, ozone oxidation and air stripping to treat by-product waste brine in the production process of ketazine method hydrazine hydrate is that the operation cost of membrane filtration and ozone technology is too high, and it is difficult to use it in the industry. Promote application

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