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Method for removing sodium carbonate in solution

A sodium carbonate and solution technology, which is applied in the direction of hydrazine, nitrogen and non-metallic compounds, can solve the problems of high economic cost and complicated process, and achieve the effect of improving economic benefits, simple process operation and easy treatment

Inactive Publication Date: 2015-11-11
ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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Problems solved by technology

[0012] The object of the present invention is to provide a method for removing sodium carbonate in the solution, which is used to solve the problem that the traditional method for removing sodium carbonate in the crude hydrazine hydrate solution has complicated technical process and high economic cost

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  • Method for removing sodium carbonate in solution
  • Method for removing sodium carbonate in solution

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Embodiment 2

[0076] see figure 2 , take a sample from the former thick hydrazine hydrate solution, and calculate the total amount of sodium carbonate in the former thick hydrazine hydrate solution, the volume of the clear liquid that this stage unit time (1 hour) is processed is 150 * 10 3 L, according to the molar ratio of calcium chloride content and sodium carbonate content is 1~1.2:1, add calcium chloride solid to the original crude hydrazine hydrate solution, and make calcium chloride and sodium carbonate fully react, then react the The product is subjected to solid-liquid separation where a centrifuge is used to reduce mother liquor entrained on the solids. The obtained serum is measured to be 60°C at this time. Since the process is a natural cooling without resorting to the loss of external heat, this process does not consume external energy, that is, Q 外2 = 0KJ. Compared with the cooling process in embodiment one, save altogether:

[0077] Q 降温节省 =Q 外1 -Q 外2 =7.94×10 10 -0=...

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Abstract

The invention discloses a method for removing sodium carbonate in a solution, and relates to the technical field of chemical impurity removal. The problem that a traditional technology for removing sodium carbonate in thick hydrazine hydrate solution is complex in process and high in economic cost is solved. The method for removing sodium carbonate in the solution comprises the steps that calcium chloride solids are added into an original solution, the calcium chloride is made to sufficiently react with sodium carbonate, and therefore the sodium carbonate in the original solution is removed. According to the method for removing sodium carbonate in the solution, the technology for removing impurities of the original solution is effectively simplified, and meanwhile the energy consumption and economic cost of the technology are lowered.

Description

technical field [0001] The invention relates to the field of chemical impurity removal, in particular to a technique for removing sodium carbonate in crude hydrazine hydrate solution with calcium chloride. Background technique [0002] Biurea (H 2 NCONHHNCONH 2 ) is the production of ADC blowing agent (azodicarbonamide, H 2 NCONNCONH 2 ) intermediates. ADC foaming agent is the most widely used spectral foaming agent in plastic products. Because of its non-toxicity, moderate decomposition temperature, and colorless and odorless decomposition products, it can be applied to almost all plastic products. It is also the blowing agent with the fastest growing consumption in recent years, and its domestic production and consumption are both large. Most of the ADC foaming agent manufacturers in my country use the acid method to produce biurea. In the process of producing biurea by the acid method, the raw material hydrazine hydrate needs to be used. The main reaction equation is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/16
Inventor 刘利德于雪峰宁鹏沈莉张义勇王元福许振琪
Owner ЦИНХАЙ СОЛТ ЛЕЙК ИНДАСТРИ ГРУП КО ЛТД
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