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Method for comprehensively utilizing hydrazine hydrate by-product sodium carbonate decahydrate through urea method

A technology of sodium carbonate decahydrate and sodium carbonate, which is applied in the field of hydrazine hydrate, can solve the problems of waste of resources, high cost, and large product size, and achieve the effects of reducing acid consumption, increasing concentration, and increasing economic value

Active Publication Date: 2013-09-04
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the defects of the process itself, the current synthetic method of producing baking soda has high energy consumption, high cost, large product size, weak market competitiveness, and low production efficiency of enterprises, especially the proportion of fine powder and fine powder products is too small to meet the market demand. demand, which greatly affects the development of enterprises
[0004] In the production of hydrazine hydrate by the urea method, a large amount of sodium carbonate decahydrate solid is produced as a by-product. Because it contains a small amount of impurities such as urea, hydrazine hydrate, and sodium chloride, it cannot be directly used in industrial production, and is generally treated as a treatment product for sodium carbonate It is a waste of resources when the quality requirement is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 100g of sodium carbonate decahydrate solid, heat it in a beaker, and add a small amount of water to dissolve it. After it is completely dissolved, add water to adjust its concentration to 20%. The clarified mother liquor was obtained by suction filtration. Pour the mother liquor into a flask with stirring and cooling in a water bath, and carbon dioxide is introduced into the bottom of the flask for carbonization until the reaction is completed. During the reaction, the reaction temperature was controlled to be 60°C. Stop passing carbon dioxide gas, cool the reaction solution to 5°C, filter, and wash the filter cake with cold water, dry and weigh to obtain 42.3 g of solid sodium bicarbonate, with a yield of 76% based on sodium carbonate.

Embodiment 2

[0025] Take 100g of sodium carbonate decahydrate solid, heat it in a beaker, and add a small amount of water to dissolve it. After it is completely dissolved, add water to adjust its concentration to 25%. The clarified mother liquor was obtained by suction filtration. Pour the mother liquor into a flask with stirring and cooling in a water bath, and carbon dioxide is introduced into the bottom of the flask for carbonization until the reaction is completed. During the reaction, the reaction temperature was controlled to be 60°C. Stop passing carbon dioxide gas, cool the reaction solution to 5°C, filter, wash the filter cake with cold water, weigh after drying to obtain 45.6 g of solid sodium bicarbonate, and the yield is 82.2% based on sodium carbonate.

Embodiment 3

[0027] Take 100g of sodium carbonate decahydrate solid, heat it in a beaker, and add a small amount of water to dissolve it. After it is completely dissolved, add water to adjust its concentration to 30%. The clarified mother liquor was obtained by suction filtration. Pour the mother liquor into a flask with stirring and cooling in a water bath, and carbon dioxide is introduced into the bottom of the flask for carbonization until the reaction is completed. During the reaction, the reaction temperature was controlled to be 60°C. Stop passing carbon dioxide gas, cool the reaction solution to 5°C, filter, and wash the filter cake with cold water, dry and weigh to obtain 47.2 g of solid sodium bicarbonate, with a yield of 85.1% based on sodium carbonate.

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Abstract

The invention provides a method for comprehensively utilizing hydrazine hydrate by-product sodium carbonate decahydrate through a urea method. The method comprises the following steps: pulping sodium carbonate decahydrate subjected to freezing crystallization, heating up, forming a sodium carbonate solution with a certain concentration, filtering, removing the impurities, introducing CO2 and carbonizing in a carbonizing tower so as to generate sodium bicarbonate, centrifuging and separating the sodium bicarbonate generated in the reaction, and drying to obtain baking soda; taking a small amount of finished baking soda, adding the baking soda into a hydrazine hydrate solution prepared by the urea method, controlling the PH value, and neutralizing the excessive caustic soda solution in the crude hydrazine solution. The method has the beneficial effects that the sodium carbonate decahydrate which serves as the waste for performing low-price treatment is comprehensively utilized, and the economic value of the by-product is greatly improved; and moreover, more sodium carbonate decahydrate can be obtained in the subsequent freezing sodium carbonate removal link, the concentration of the hydrazine hydrate in the crude hydrazine is improved, and the consumption of acid in the biurea condensation reaction process is reduced.

Description

technical field [0001] The invention relates to the field of hydrazine hydrate, in particular to a method for comprehensive utilization of sodium carbonate decahydrate by-product of urea process hydrazine hydrate. Background technique [0002] Baking soda (NaHCO 3 ) is an important inorganic chemical product, which is widely used in industries such as food starter, feed additive, fire protection, pharmaceuticals, mineral processing, smelting, tanning, water treatment, etc., especially fine powder products with a particle size below 150 μm have wider uses and additional production higher value. [0003] NaHCO 3 The production methods mainly include synthesis method, double decomposition method and trona method, etc., and the synthesis method mainly consumes soda ash, and the product quality is stable and reliable, so it is a widely used baking soda production technology in China. However, due to the defects of the process itself, the current synthetic method of producing b...

Claims

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Application Information

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IPC IPC(8): C01D7/12
Inventor 陈海贤魏增
Owner HANGZHOU HI TECH FINE CHEM
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