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Green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent

A technology of ADC foaming agent and hydrazine hydrate, which is applied in the field of new green cycle production technology, can solve the problems of waste water pollution, and achieve the effects of low equipment investment, small pressure difference loss, and low energy consumption

Inactive Publication Date: 2014-07-23
赖中胜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The first object of the present invention is to provide a kind of method that reduces the caustic soda consumption of sodium hypochlorite urea oxidation method hydrazine hydrate production technology, and the second object of the present invention is to provide a kind of decahydrate carbonic acid that solves by-product in the sodium hypochlorite urea oxidation method technology The optimal recycling of sodium and sodium carbonate monohydrate, the third purpose of the present invention is to reduce the energy consumption of hydrazine salt, the fourth purpose of the present invention is to solve the waste water pollution problem during the production of hydrazine salt and ADC blowing agent

Method used

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  • Green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent
  • Green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent
  • Green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The first step: raw material preparation

[0079] Urea: N%≥46%

[0080] Caustic soda: NaOH%≥30%

[0081] Chlorine: Cl 2 %≥95%

[0082] Catalyst: magnesium chloride hexahydrate, the content is more than 95%

[0083] Slaked Lime: Calcium Hydroxide 95%

[0084] Sodium carbonate decahydrate: Sodium carbonate content is 32%

[0085] The second step: preparation of lime emulsion: add 148kg of slaked lime to 2000 liters of enamel reactor, add 179kg of water and stir to make 327kg of lime milk containing calcium hydroxide 43%.

[0086] The third step: preparation of causticized sodium hypochlorite solution: pour the milk of lime obtained in the first step into the enamel reaction kettle, start stirring, open the jacket frozen brine, add 630 kg of sodium carbonate decahydrate containing 32% sodium carbonate continuously, and simultaneously Continuously feed chlorine gas 133kg and control PH greater than 10, adjust the switch of freezing brine and the amount of chlorine flo...

Embodiment 2

[0095] The first step: raw material preparation

[0096] Urea: N%≥46%

[0097] Caustic soda: NaOH%≥30%

[0098] Chlorine: Cl 2 %≥95%

[0099] Catalyst: magnesium chloride hexahydrate, the content is more than 95%

[0100] Slaked Lime: Calcium Hydroxide 95%

[0101] Sodium carbonate monohydrate: Sodium carbonate content is 67%

[0102] Step 2: Lime emulsion preparation: Add 148kg of slaked lime and 379kg of water into a 2000-liter enamel reactor and stir to make 527kg of lime milk containing 26.7% calcium hydroxide.

[0103] The third step: preparation of causticized sodium hypochlorite solution: add 301 kg of sodium carbonate monohydrate containing 67% sodium carbonate to the milk of lime obtained in the first step, start stirring, and continuously feed 133 kg of chlorine into the sodium carbonate lime emulsion made , and control the pH to be greater than 10, adjust the switch of the frozen brine and the amount of chlorine to control the temperature of the entire reactio...

Embodiment 3

[0110] The first step: raw material preparation

[0111] Urea: N%≥46%

[0112] Caustic soda: NaOH%≥30%

[0113] Chlorine: Cl 2 %≥95%

[0114] Catalyst: magnesium chloride hexahydrate, the content is more than 95%

[0115] Slaked Lime: Calcium Hydroxide 95%

[0116] Sodium sulfate decahydrate: sodium sulfate content is 54% (partial weathering and dehydration)

[0117] Step 2: Lime emulsion preparation: Add 152kg of slaked lime and 318kg of water into a 2000-liter enamel reactor and stir to make 470kg of lime milk containing 30.7% calcium hydroxide.

[0118] The third step: preparation of causticized sodium hypochlorite solution: add sodium sulfate decahydrate 511kg containing sodium sulfate 56% to the milk of lime obtained in the first step, start stirring to make sodium sulfate lime emulsion, and the temperature of the emulsion is lowered to Below 30°C, add chlorine gas to the sodium sulfate lime emulsion, adjust the flow rate of chlorine to control the reaction temperat...

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Abstract

The invention relates to a green cycle production novel method of hydrazine hydrate, hydrazonium salts, and ADC foaming agent. The green cycle production novel method is characterized in that: sodium sulfate or sodium carbonate, or a mixture of sodium sulfate and sodium carbonate, is reacted with chlorine and lime emulsion so as to obtain causticized sodium hypochlorite, and the obtained causticized sodium hypochlorite is used for synthesizing hydrazine hydrate; multi-effect continuous evaporation is adopted for separating sodium chloride, sodium carbonate, sodium hydroxide, hydrazine hydrate, and water in an obtained low-concentration hydrazine hydrate solution, hydrazine-containing water vapour obtained via evaporation is subjected to acid neutralization absorption so as to obtain the hydrazonium salts, and left water vapour which is not absorbed is taken as a heat source of a next time of evaporation for reutilization, the hydrazonium salts are continuously collected from different levels of packing absorbing column kettles, sodium chloride and sodium carbonate crystals precipitated after multi-effect evaporator evaporative concentration are subjected to salt and alkali gravity fractionation so as to obtain sodium chloride and monohydrate sodium carbonate respectively; a hydrazine hydrate synthesis reaction liquid is refrigerated, evaporation by-products sodium carbonate decahydrate and monohydrate sodium carbonate are reacted with chlorine and lime emulsion so as to obtain causticized sodium hypochlorite, and then the obtained causticized sodium hypochlorite is recycled for synthesizing hydrazine hydrate.

Description

1. Technical field: [0001] The invention relates to a new green cycle production process of hydrazine hydrate, hydrazine salt and ADC foaming agent, belonging to the technical field of chemical technology. 2. Background technology: [0002] Hydrazine hydrate and hydrazine salts (including hydrazine hydrochloride and hydrazine sulfate) are important chemical raw materials, widely used in the production of medicine, pesticide, plastic rubber foaming agent ADC. At present, the main mature hydrazine hydrate production processes include the ketazine process and the urea sodium hypochlorite oxidation process. Since the ketazine process produces 1 ton of hydrazine hydrate, 45 tons of waste brine will be produced and cannot be treated in an environmentally friendly manner. Therefore, the main hydrazine hydrate and hydrazine hydrate in my country The production process of salt and ADC foaming agent is mainly based on the urea sodium hypochlorite oxidation process, and the process is a...

Claims

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Application Information

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IPC IPC(8): C01B21/16C07C281/20
Inventor 赖中胜
Owner 赖中胜
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